CN114665969A - Signal transmitting apparatus, signal receiving method, and optical transmission system - Google Patents

Signal transmitting apparatus, signal receiving method, and optical transmission system Download PDF

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Publication number
CN114665969A
CN114665969A CN202011540316.1A CN202011540316A CN114665969A CN 114665969 A CN114665969 A CN 114665969A CN 202011540316 A CN202011540316 A CN 202011540316A CN 114665969 A CN114665969 A CN 114665969A
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China
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signal
optical
signals
different wavelengths
optical signal
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李良川
桂韬
袁帅
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN202011540316.1A priority Critical patent/CN114665969A/en
Priority to PCT/CN2021/129840 priority patent/WO2022134909A1/en
Publication of CN114665969A publication Critical patent/CN114665969A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/572—Wavelength control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Communication System (AREA)

Abstract

A signal sending device, a signal receiving method and an optical transmission system belong to the field of optical communication. The signal sending device comprises a modulation multiplexing module and a sending module, wherein the modulation multiplexing module is used for modulating and multiplexing n optical signals with different wavelengths to obtain a target optical signal, the target optical signal comprises a first optical signal and a second optical signal, the wavelength of the first optical signal is different from that of the second optical signal, and the first optical signal and the second optical signal carry associated data signals; the sending module is used for sending a target optical signal to the optical link; the signal receiving device comprises a receiving module and a photoelectric conversion module, wherein the receiving module is used for receiving a target optical signal through an optical link, and the photoelectric conversion module is used for performing photoelectric conversion on the target optical signal to obtain a target electric signal. The optical signal superposition transmission device can superpose and transmit the optical signals carrying the associated data signals, plays a role in amplifying the optical signals and the data signals, and guarantees the reliability of the optical signals and the data signals in long-distance transmission.

Description

Signal transmitting apparatus, signal receiving method, and optical transmission system
Technical Field
The present application relates to the field of optical communications, and in particular, to a signal transmitting apparatus, a signal receiving method, and an optical transmission system.
Background
An optical transmission system generally includes a signal transmission device and a signal reception device, and the signal transmission device and the signal reception device are connected by an optical fiber. The signal sending device comprises a modulation module, the modulation module is used for carrying out intensity modulation on the optical signal, and the signal sending device is used for transmitting the modulated optical signal to the signal receiving device through the optical fiber.
However, the optical power of the optical signal modulated by the modulation module is low, which causes the optical power of the optical signal transmitted by the signal transmitting apparatus to be low, thereby affecting the reliability of the optical signal in long-distance transmission.
Disclosure of Invention
The application provides a signal sending device, a signal receiving method and an optical transmission system, which are beneficial to improving the optical power of an optical signal and the intensity of a data signal and ensuring the reliability of the optical signal and the data signal in long-distance transmission. The technical scheme of the application is as follows:
in a first aspect, a signal transmitting apparatus is provided, including: a modulation multiplexing module and a transmitting module; the modulation multiplexing module is configured to modulate and multiplex n optical signals with different wavelengths to obtain a target optical signal, where the target optical signal includes a first optical signal and a second optical signal, the wavelength of the first optical signal is different from that of the second optical signal, the first optical signal and the second optical signal carry associated data signals, and n is an integer greater than 1; the sending module is used for sending the target optical signal to the optical link. The data signal may be an analog signal or a digital signal carrying data, and the data signal may be an electrical signal, that is, the data signal is an analog electrical signal or a digital electrical signal, and the modulation multiplexing module may modulate n optical signals with different wavelengths by using the associated data signal at least, so that the first optical signal and the second optical signal included in the target optical signal obtained through modulation and multiplexing carry the associated data signal. The transmitting module may be a module independent from the modulation multiplexing module or a module integrated in the modulation multiplexing module, for example, the transmitting module is an interface in the modulation multiplexing module for connecting with an optical link, and the transmitting module may be implemented by an optical waveguide or a coupler.
According to the signal sending device, the modulation multiplexing module can modulate and multiplex n optical signals with different wavelengths to obtain the target optical signal, and the first optical signal and the second optical signal in the target optical signal carry associated data signals, so that the target optical signal is a superposition signal of the n optical signals with different wavelengths, and the signal superposition process plays an amplification role, so that the optical power of the target optical signal sent by the signal sending device is high, the intensity of the data signal carried by the target optical signal is high, and the reliability of the target optical signal and the data signal carried by the target optical signal in long-distance transmission is ensured.
In one possible implementation, the associated data signal is generated by a route data signal. For example, the associated data signal is obtained by copying a data signal, or the associated data signal is obtained by splitting a data signal.
The signal sending device provided by the application uses one path of data signal to generate the associated data signal, the modulation multiplexing module can modulate n kinds of optical signals with different wavelengths by using the associated data signal, so that the first optical signal and the second optical signal in the target optical signal obtained through modulation and multiplexing carry the associated data signal, and the target optical signal is a superposed signal of the n kinds of optical signals with different wavelengths.
In one possible implementation, the associated data signals are the same data signals; alternatively, the associated data signal is conjugated; alternatively, the associated data signal is a differential signal. The same data signals mean that parameters such as the amplitude, the phase and the polarity of the two paths of data signals are the same; the data signal conjugation means that, for example, the two data signals have equal amplitude, opposite phases (i.e., the phase difference is 180 °) and the polarities are the same; the data signals are differential signals, which means that the two data signals have equal amplitude, opposite phase and opposite polarity, for example.
According to the signal transmitting device provided by the application, because the associated data signals are the same data signal, or the associated data signals are conjugated, or the associated data signals are differential signals, it is convenient to modulate n optical signals with different wavelengths by using the associated data signals, so that the modulated and multiplexed target optical signal is a superimposed signal of the optical signals with different wavelengths, and the data signal carried by the target optical signal is a superimposed signal of the associated data signal, thereby improving the optical power of the target optical signal and the intensity of the data signal carried by the target optical signal, and ensuring the reliability of the target optical signal and the data signal carried by the target optical signal during long-distance transmission.
In one possible implementation, the modulation multiplexing module includes: a modulation unit and an optical multiplexer; the modulation unit is configured to modulate n optical signals with different wavelengths to obtain n modulated optical signals with different wavelengths, and the optical multiplexer is configured to multiplex the n modulated optical signals with different wavelengths to obtain the target optical signal. For example, the modulation unit modulates the n optical signals with different wavelengths by using the associated data signals, so that the modulated n optical signals with different wavelengths carry the associated data signals, and the optical multiplexer multiplexes the modulated n optical signals with different wavelengths to obtain a target optical signal carrying the associated data signal.
In a possible implementation manner, the modulation unit includes n light sources, the wavelengths of the optical signals emitted by the n light sources are different, and the n light sources are configured to modulate the n optical signals with different wavelengths in a one-to-one correspondence manner, so as to obtain the n modulated optical signals with different wavelengths. The modulated n optical signals with different wavelengths include a first optical signal and a second optical signal with different wavelengths, and the first optical signal and the second optical signal carry associated data signals. The manner of modulating the optical signal by using the light source may be referred to as an internal modulation manner, and the internal modulation manner is a manner of modulating the optical signal in the light source and is also referred to as a direct modulation manner.
According to the signal transmitting device, the modulation unit modulates the optical signals with n different wavelengths by adopting an internal modulation mode, so that the optical signals can be modulated by using the light source without arranging a modulator in the signal transmitting device, and the structure of the signal transmitting device is facilitated to be simplified.
In one possible implementation manner, the modulation unit includes n light sources and n modulators, and the n light sources and the n modulators are in one-to-one correspondence; each light source in the n light sources is used for inputting an optical signal with one wavelength to a corresponding modulator, and the wavelengths of the optical signals input to the n modulators by the n light sources are different; the n modulators are used for modulating the optical signals input by the n light sources in a one-to-one correspondence manner to obtain n modulated optical signals with different wavelengths. The modulated n optical signals with different wavelengths include a first optical signal and a second optical signal with different wavelengths, and the first optical signal and the second optical signal carry associated data signals. The method of modulating the optical signal emitted by the light source by the modulator may be referred to as an external modulation method, and the external modulation method is a method of modulating the optical signal by the modulator outside the light source.
In one possible implementation manner, the signal transmission apparatus further includes: the splitter is used for splitting one path of data signals into n paths of data signals before the modulation multiplexing module modulates and multiplexes the optical signals with n different wavelengths. The target optical signal comprises n optical signals with different wavelengths, and the n optical signals with different wavelengths carry n paths of data signals in a one-to-one correspondence manner. Since the n data signals are obtained by splitting one data signal, the n data signals are associated data signals, and the modulation multiplexing module can modulate n optical signals with different wavelengths in a one-to-one correspondence manner by using the n data signals. In a possible implementation manner, the n data signals are the same, or two pairs of the n data signals are conjugated (that is, any two data signals in the n data signals are conjugated), or two pairs of the n data signals are differential signals (that is, any two data signals in the n data signals are differential signals).
The application provides a signal transmission device, the branching unit divides into n data signal with data signal all the way, can be convenient for the modulation multiplexing module utilizes this n data signal to modulate the optical signal one-to-one of n different wavelength, make the optical signal one-to-one of n different wavelength after the modulation carry this n data signal, thereby make the target optical signal who obtains through modulation and multiplexing carry this n superimposed signal of data signal, improve the intensity of the data signal that this target optical signal carried, guarantee the reliability of data signal that this target optical signal and this target optical signal carried when long distance transmission.
In one possible implementation manner, the signal transmission apparatus further includes: the m delayers are used for respectively delaying m paths of data signals in the n paths of data signals before the modulation multiplexing module modulates and multiplexes the n optical signals with different wavelengths, wherein m is more than or equal to 1 and less than or equal to n, and m is an integer. The n data signals used by the modulation multiplexing module to modulate the n optical signals with different wavelengths may include m data signals delayed by the m delays.
In the signal transmitting apparatus provided by the application, the m delayers respectively delay m data signals in n data signals, so that when a target optical signal obtained through modulation and multiplexing by the modulation and multiplexing module is transmitted to the signal receiving apparatus through an optical link, the n data signals carried by n optical signals with different wavelengths included in the target optical signal are as synchronous as possible.
In one possible implementation manner, the signal sending apparatus further includes: and the amplifying module is used for amplifying the n paths of data signals before the modulation multiplexing module modulates and multiplexes the optical signals with n different wavelengths. The n data signals used by the modulation multiplexing module to modulate the n optical signals with different wavelengths may be the n amplified data signals.
The application provides a signal transmission device, the amplifier module is enlargied n way data signal, can increase this n way data signal's intensity, and the multiplexing module of being convenient for modulates the optical signal of n kinds of different wavelength with this n way data signal of modulation.
In a second aspect, a signal receiving apparatus is provided, including: a receiving module and a photoelectric conversion module; the receiving module is configured to receive a target optical signal through an optical link, where the target optical signal includes n optical signals with different wavelengths, the n optical signals with different wavelengths include a first optical signal and a second optical signal, the first optical signal and the second optical signal carry associated data signals, and n is an integer greater than 1; the photoelectric conversion module is used for performing photoelectric conversion on the target optical signal to obtain a target electrical signal, and the target electrical signal comprises the associated data signal. The data signal may be an analog signal or a digital signal carrying data, and the data signal may be an electrical signal, that is, the data signal is an analog electrical signal or a digital electrical signal. The target electrical signal is a superimposed signal of the associated data signal. The receiving module may be a module separate from the photoelectric conversion module or a module integrated in the photoelectric conversion module, for example, the receiving module is an interface in the photoelectric conversion module for connecting with an optical link. The receiving module may be implemented by an optical waveguide or a coupler, or the receiving module may be a chip incident surface for implementing the photoelectric conversion module. The photoelectric conversion module may include at least one of a PIN (positive intrinsic negative diode) and an Avalanche Photodiode (APD).
In the signal receiving device provided by the application, the target optical signal received by the signal receiving device is obtained by modulating and multiplexing n optical signals with different wavelengths by the signal sending device, the first optical signal and the second optical signal in the target optical signal carry associated data signals, the associated data signals can be generated by one data signal, the associated data signals can be considered to have the same information, and the associated data signals can be a data signal, so that the signal receiving device can directly perform photoelectric conversion on the target optical signal without demultiplexing the target optical signal to obtain the target electrical signal. The target optical signal is sent after the signal sending device modulates and multiplexes the n optical signals with different wavelengths, so that the target optical signal sent by the signal sending device is a superposition signal of the n optical signals with different wavelengths, and the signal superposition process plays an amplification role, so that the optical power of the target optical signal sent by the signal sending device is higher, the intensity of a data signal carried by the target optical signal is higher, the reliability of the target optical signal and the data signal carried by the target optical signal in long-distance transmission is ensured, and the data signal can be conveniently and correctly demodulated from the target optical signal by the signal receiving device.
In one possible implementation, the associated data signal is generated by a route data signal.
In one possible implementation, the associated data signals are the same data signals; alternatively, the associated data signal is conjugated; alternatively, the associated data signal is a differential signal.
In one possible implementation manner, the signal receiving apparatus further includes: and the processing module is used for carrying out digital signal processing on the target electric signal. The processing module may include an analog to digital conversion (ADC) chip and a Digital Signal Processing (DSP) chip, where the target electrical signal may be an analog electrical signal, the ADC chip is configured to convert the target electrical signal into a digital signal, and the DSP chip is configured to perform DSP processing on the digital signal.
In a third aspect, an optical transmission system is provided, including: the signal transmitting apparatus according to the first aspect, and the signal receiving apparatus according to the second aspect, the signal transmitting apparatus and the signal receiving apparatus being connected by an optical link. The optical link may include an optical transmission medium such as an optical fiber, and may further include an optical device such as an optical amplifier and an optical connector.
In the optical transmission system provided by the application, a signal sending device may modulate and multiplex optical signals with n different wavelengths to obtain a target optical signal including a first optical signal and a second optical signal, and send the target optical signal to a signal receiving device, where the wavelength of the first optical signal is different from that of the second optical signal, and the first optical signal and the second optical signal carry associated data signals; after the signal receiving device receives the target optical signal, the signal receiving device performs photoelectric conversion on the target optical signal to obtain a target electrical signal including the associated data signal, that is, the signal receiving device recovers the associated data signal from the target optical signal. Because the signal sending device modulates and multiplexes the n optical signals with different wavelengths and sends the optical signals to the signal receiving device, the target optical signal sent by the signal sending device is a superposition signal of the n optical signals with different wavelengths, and the superposition process of the optical signals plays an amplifying role, so that the optical power of the target optical signal sent by the signal sending device is higher, the intensity of a data signal carried by the target optical signal is higher, the reliability of the target optical signal and the data signal carried by the target optical signal in long-distance transmission is ensured, and the signal receiving device can conveniently and correctly demodulate the data signal from the target optical signal.
In one possible implementation, the signal transmission apparatus includes: a modulation multiplexing module and a sending module; the modulation multiplexing module is configured to modulate and multiplex optical signals with n different wavelengths to obtain a target optical signal, where the target optical signal includes a first optical signal and a second optical signal, the wavelength of the first optical signal is different from that of the second optical signal, the first optical signal and the second optical signal carry associated data signals, and n is an integer greater than 1; the sending module is used for sending the target optical signal to the optical link.
In one possible implementation, the modulation multiplexing module includes: the optical signal multiplexing device comprises a multiplexing unit and a modulator, wherein the multiplexing unit is used for multiplexing optical signals with n different wavelengths to obtain multiplexed optical signals, and the modulator is used for modulating the multiplexed optical signals to obtain target optical signals. The modulator may modulate the multiplexed optical signal with a channel of data signal, so that the optical signal of each wavelength in the modulated target optical signal carries the channel of data signal. The manner in which the modulator modulates the multiplexed optical signal may be referred to as an external modulation manner.
In one possible implementation, the multiplexing unit includes: the optical multiplexer and n light sources, each light source in the n light sources is used for inputting an optical signal with one wavelength to the optical multiplexer, and the wavelengths of the optical signals input to the optical multiplexer by the n light sources are different; the optical multiplexer is used for multiplexing the optical signals input by the n light sources to obtain multiplexed optical signals.
In one possible implementation manner, the signal transmission apparatus further includes: and the amplifying module is used for amplifying a path of data signal before the modulator modulates the multiplexed optical signal, and the first optical signal and the second optical signal both carry the data signal. Wherein the data signal used by the modulator to modulate the multiplexed optical signal is an amplified data signal.
In a fourth aspect, a signal transmitting method is provided, and is applied to a signal transmitting apparatus, where the signal transmitting apparatus includes a modulation multiplexing module and a transmitting module, and the method includes: the modulation multiplexing module modulates and multiplexes n optical signals with different wavelengths to obtain a target optical signal, wherein the target optical signal comprises a first optical signal and a second optical signal, the wavelength of the first optical signal is different from that of the second optical signal, the first optical signal and the second optical signal carry associated data signals, and n is an integer greater than 1; the transmitting module transmits the target optical signal to an optical link.
In one possible implementation, the associated data signal is generated by a route data signal.
In one possible implementation, the associated data signals are the same data signals; alternatively, the associated data signal is conjugated; alternatively, the associated data signal is a differential signal.
In one possible implementation, the modulation multiplexing module includes: the modulation multiplexing module modulates and multiplexes the optical signals with n different wavelengths to obtain a target optical signal, and the modulation multiplexing module comprises: the modulation unit modulates the n optical signals with different wavelengths to obtain n modulated optical signals with different wavelengths, and the optical multiplexer multiplexes the n modulated optical signals with different wavelengths to obtain the target optical signal.
In a possible implementation manner, the modulation unit includes n light sources, and the wavelengths of the light signals emitted by the n light sources are different from each other; the modulation unit modulates n kinds of optical signals with different wavelengths to obtain n kinds of modulated optical signals with different wavelengths, and the modulation unit comprises: the n light sources modulate the n optical signals with different wavelengths in a one-to-one correspondence manner to obtain n modulated optical signals with different wavelengths.
In one possible implementation manner, the modulation unit includes n light sources and n modulators, and the n light sources and the n modulators are in one-to-one correspondence; the modulation unit modulates the optical signals with n different wavelengths to obtain modulated optical signals with n different wavelengths, and the method comprises the following steps: each light source in the n light sources inputs an optical signal with one wavelength to the corresponding modulator, the wavelengths of the optical signals input to the n modulators by the n light sources are different, and the n modulators modulate the optical signals input by the n light sources in a one-to-one correspondence manner to obtain the modulated optical signals with n different wavelengths.
In a possible implementation manner, the signal sending apparatus further includes a splitter, and before the modulation multiplexing module modulates and multiplexes the optical signals with n different wavelengths, the method further includes: the splitter splits a path of data signals into n paths of data signals, the target optical signal includes n types of optical signals with different wavelengths, and the n types of optical signals with different wavelengths carry the n paths of data signals in a one-to-one correspondence.
In a possible implementation manner, the signal sending device further comprises m delayers, m is more than or equal to 1 and less than or equal to n, and m is an integer; before the modulation multiplexing module modulates and multiplexes the optical signals with n different wavelengths, the method further comprises: the m delayers delay m paths of data signals in the n paths of data signals respectively.
In a possible implementation manner, the signal transmitting apparatus further includes an amplifying module, and before the modulation multiplexing module modulates and multiplexes the optical signals with n different wavelengths, the method further includes: the amplifying module amplifies the n paths of data signals.
For technical effects corresponding to the fourth aspect and various optional implementation manners of the fourth aspect, reference may be made to the technical effects corresponding to the first aspect and the various optional implementation manners of the first aspect, and details are not repeated here.
In a fifth aspect, a signal receiving method is provided, which is applied to a signal receiving apparatus, where the signal receiving apparatus includes a receiving module and a photoelectric conversion module, and the method includes: the receiving module receives a target optical signal through an optical link, wherein the target optical signal comprises n optical signals with different wavelengths, the n optical signals with different wavelengths comprise a first optical signal and a second optical signal, the first optical signal and the second optical signal carry associated data signals, and n is an integer greater than 1; the photoelectric conversion module performs photoelectric conversion on the target optical signal to obtain a target electrical signal, and the target electrical signal comprises the associated data signal.
In one possible implementation, the associated data signal is generated by a route data signal.
In one possible implementation, the associated data signals are the same data signals; alternatively, the associated data signal is conjugated; alternatively, the associated data signal is a differential signal.
In a possible implementation manner, the signal receiving apparatus further includes a processing module, and after the photoelectric conversion module performs photoelectric conversion on the target optical signal to obtain a target electrical signal, the method further includes: the processing module performs digital signal processing on the target electric signal.
For technical effects corresponding to the fifth aspect and various optional implementation manners of the fifth aspect, reference may be made to the aforementioned second aspect and the technical effects corresponding to the various optional implementation manners of the second aspect, and details are not repeated here.
A sixth aspect provides a chip, which includes a programmable logic circuit and/or program instructions, and when the chip is operated, implements the signal sending method provided in the fourth aspect or any optional implementation manner of the fourth aspect, or implements the signal receiving method provided in the fifth aspect or any optional implementation manner of the fourth aspect.
The beneficial effect that technical scheme that this application provided brought is:
according to the signal sending device, the signal receiving method and the optical transmission system, the signal sending device can modulate and multiplex n optical signals with different wavelengths to obtain a target optical signal comprising a first optical signal and a second optical signal, and sends the target optical signal to the signal receiving device, the wavelength of the first optical signal is different from that of the second optical signal, and the first optical signal and the second optical signal carry associated data signals; after the signal receiving device receives the target optical signal, the signal receiving device performs photoelectric conversion on the target optical signal to obtain a target electrical signal including the associated data signal, that is, the signal receiving device recovers the data signal from the target optical signal. Because the signal sending device modulates and multiplexes the n optical signals with different wavelengths and sends the optical signals to the signal receiving device, the target optical signal sent by the signal sending device is a superposed signal of the n optical signals with different wavelengths, and the signal superposition process plays an amplifying role, so that the optical power of the target optical signal sent by the signal sending device is higher, the intensity of the data signal carried by the target optical signal is higher, the reliability of the target optical signal and the data signal carried by the target optical signal in long-distance transmission is ensured, and the data signal can be conveniently and correctly demodulated from the target optical signal by the signal receiving device. In addition, the associated data signal carried by the target optical signal may be generated by a data signal, and the associated data signal may be considered to have the same information, so that the signal receiving apparatus may directly perform the optical-to-electrical conversion on the target optical signal to obtain the target electrical signal without demultiplexing the target optical signal. Therefore, the optical power of the optical signal and the intensity of the data signal carried by the optical signal can be improved without arranging an optical amplifier in the signal sending device, the data signal can be correctly demodulated from the optical signal without arranging a demultiplexer in the signal receiving device, the miniaturization of the signal sending device and the signal receiving device is facilitated, the cost of the signal sending device and the signal receiving device is reduced, and the cost of an optical transmission system comprising the signal sending device and the signal receiving device is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a signal transmitting apparatus according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of another signal transmission apparatus provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of another signal transmission apparatus according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a signal receiving apparatus according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an optical transmission system according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of another optical transmission system provided in the embodiment of the present application;
fig. 7 is a schematic structural diagram of another optical transmission system provided in an embodiment of the present application;
fig. 8 is a schematic structural diagram of another optical transmission system provided in the embodiment of the present application;
fig. 9 is a flowchart of a signal transmission method according to an embodiment of the present application;
fig. 10 is a flowchart of modulating and multiplexing optical signals with n different wavelengths according to an embodiment of the present application;
fig. 11 is another flowchart for modulating and multiplexing optical signals with n different wavelengths according to the embodiment of the present application;
fig. 12 is a flowchart of a signal receiving method according to an embodiment of the present application.
Detailed Description
To make the principles, technical solutions and advantages of the present application clearer, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
An optical transmission system generally includes a signal transmission device and a signal reception device, and the signal transmission device and the signal reception device are connected by an optical fiber. The signal transmitting apparatus generally modulates an optical signal with a data signal to be transmitted (for example, an electrical signal carrying data, which may be an analog signal or a digital signal) and transmits the modulated optical signal to the signal receiving apparatus through an optical fiber, where the modulated optical signal carries the data signal. After receiving the modulated optical signal, the signal receiving device demodulates the modulated optical signal to recover the data signal from the optical signal. In this way, transmission of data signals from the signal transmitting apparatus to the signal receiving apparatus can be achieved.
The optical signal is attenuated, distorted and the like during transmission, so that a certain transmission loss exists in the optical signal, and the transmission loss can reduce the optical power of the optical signal, so that the optical power of the optical signal reaching the signal receiving device is low, and the demodulation of the optical signal by the signal receiving device is influenced. For example, if the optical power of an optical signal reaching the signal receiving apparatus is too low, the signal receiving apparatus may not demodulate the received optical signal, or may not demodulate the received optical signal correctly, so that the signal receiving apparatus may not recover the data signal carried by the optical signal.
In order to ensure that the signal receiving device can accurately recover the data signal from the received optical signal, the optical signal transmitted by the signal transmitting device needs to have a sufficiently large optical power when reaching the signal receiving device, which requires that the optical power of the optical signal transmitted by the signal transmitting device is sufficiently large. Currently, an optical amplifier, such as a Semiconductor Optical Amplifier (SOA) or an Optical Fiber Amplifier (OFA), is generally disposed in the signal transmitting apparatus, and the optical amplifier is used for amplifying a modulated optical signal to increase the optical power of the optical signal transmitted by the signal transmitting apparatus.
However, the provision of an optical amplifier in the signal transmission device tends to increase the size of the signal transmission device, and it is difficult to miniaturize the signal transmission device. Also, optical amplifiers such as SOA, OFA, and the like are expensive, and providing an optical amplifier in a signal transmission apparatus easily leads to a high cost of the signal transmission apparatus.
In view of this, embodiments of the present application provide a signal sending apparatus, a signal receiving apparatus, a method, and an optical transmission system, where the optical transmission system includes the signal sending apparatus and the signal receiving apparatus, the signal sending apparatus may modulate and multiplex optical signals with n different wavelengths to obtain a target optical signal including a first optical signal and a second optical signal, and send the target optical signal to the signal receiving apparatus, where the wavelength of the first optical signal is different from that of the second optical signal, and the first optical signal and the second optical signal carry associated data signals; after the signal receiving device receives the target optical signal, the signal receiving device performs photoelectric conversion on the target optical signal to obtain a target electrical signal including the associated data signal, that is, the signal receiving device recovers the data signal from the target optical signal. Because the signal sending device modulates and multiplexes the n optical signals with different wavelengths and sends the optical signals to the signal receiving device, the target optical signal sent by the signal sending device is a superposition signal of the n optical signals with different wavelengths, and the signal superposition process plays an amplifying role, so that the optical power of the target optical signal sent by the signal sending device is higher, the intensity of the data signal carried by the target optical signal is higher, the reliability of the target optical signal and the data signal carried by the target optical signal in long-distance transmission is ensured, and the data signal can be conveniently and correctly demodulated from the target optical signal by the signal receiving device. In addition, the associated data signal carried by the target optical signal may be generated by a data signal, and the associated data signal may be considered to have the same information, so that the signal receiving apparatus may directly perform the optical-to-electrical conversion on the target optical signal to obtain the target electrical signal without demultiplexing the target optical signal. Therefore, in the embodiment of the application, the optical power of the optical signal and the intensity of the data signal carried by the optical signal can be improved without arranging an optical amplifier in the signal transmitting device, and the data signal can be correctly demodulated from the optical signal without arranging a demultiplexer in the signal receiving device, which is beneficial to realizing the miniaturization of the signal transmitting device and the signal receiving device, reducing the cost of the signal transmitting device and the signal receiving device, and further reducing the cost of an optical transmission system comprising the signal transmitting device and the signal receiving device. The technical solution of the present application is described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a signal transmitting apparatus 100 according to an embodiment of the present application, where the signal transmitting apparatus 100 is configured to modulate a data signal onto an optical signal for transmission. As shown in fig. 1, the signal transmission apparatus 100 may include: a modulation multiplexing module 110 and a transmitting module 120. The modulation multiplexing module 110 is configured to modulate and multiplex optical signals with n different wavelengths to obtain a target optical signal, where the target optical signal may include a first optical signal and a second optical signal, a wavelength of the first optical signal is different from a wavelength of the second optical signal, the first optical signal and the second optical signal carry associated data signals, n is an integer greater than 1, and for example, n is 2. The transmitting module 120 is configured to transmit the target optical signal to an optical link (not shown in fig. 1). For example, the sending module 120 may be a module independent from the modulation multiplexing module 110, or a module integrated in the modulation multiplexing module 110, which is not limited in this embodiment. For example, as shown in fig. 1, the transmitting module 120 is integrated in the modulation multiplexing module 110, and the transmitting module 120 is an interface in the modulation multiplexing module 110 for connecting with an optical link. The transmitting module 120 may be implemented by an optical waveguide or a coupler, for example. The optical link is a link for transmitting an optical signal, and for example, the optical link may include an optical transmission medium such as an optical fiber, and may further include an optical device such as an optical amplifier and an optical connector.
In this embodiment, the target optical signal includes a first optical signal and a second optical signal, where data signals carried by the first optical signal and the second optical signal are correlated, and the two correlated data signals may be generated from one data signal, and the correlated data signals may be considered to have the same information. For example, the associated data signal is obtained by copying a data signal, or the associated data signal is obtained by splitting a data signal, which is not limited in this embodiment of the present application. For example, the associated data signals are the same data signals, or the associated data signals are conjugate, or the associated data signals are differential signals. For example, the associated data signals include a first data signal a and a second data signal B, and the first data signal a and the second data signal B are the same data signals: the amplitude of the first data signal a is equal to the amplitude of the second data signal B, the phase of the first data signal a is the same as the phase of the second data signal B, and the polarity of the first data signal a is the same as the polarity of the second data signal B, that is, the first data signal a and the second data signal B satisfy the relationship: alpha is alphaA＝αB，φA＝φB，PA＝PBWhere α represents the amplitude of the data signal, φ represents the phase of the data signal, and P represents the polarity of the data signal. Where data signal conjugation refers to, for example, two data signals being equal in amplitude, opposite in phase (i.e., 180 ° out of phase), and identical in polarity, e.g., the associated data signals include a first data signal a and a second data signal B, the first data signal a and the second data signal B conjugation refer to: the amplitude of the first data signal A is equal to the amplitude of the second data signal B, the phase of the first data signal A is opposite to the phase of the second data signal B, and the polarity of the first data signal A is the same as the polarity of the second data signal B, i.e., the first data signal A and the second data signal B have the same amplitude, i.e., the first data signal A and the second data signal B have the same polarityThe data signal a and the second data signal B satisfy the relationship: alpha is alphaA＝αB，φA＝φB+180°，PA＝PBOr αA＝αB，φA＝φB-180°，PA＝PB. For example, the two data signals are equal in amplitude, opposite in phase, and opposite in polarity, the associated data signal includes a first data signal a and a second data signal B, and the first data signal a and the second data signal B are differential signals: the amplitude of the first data signal a is equal to the amplitude of the second data signal B, the phase of the first data signal a is opposite to the phase of the second data signal B, and the polarity of the first data signal a is opposite to the polarity of the second data signal B, that is, the first data signal a and the second data signal B satisfy the relationship: alpha is alphaA＝αB，φA＝φB+180°，PA＝-PBOr αA＝αB，φA＝φB-180°，PA＝-PB。
In the embodiment of the present application, one path of the data signal generating the associated data signal may be an electrical signal, and may be an analog electrical signal or a digital electrical signal, and the one path of the data signal may be derived from a signal source. For example, taking the one data signal as an analog electrical signal as an example, the signal source may include a Media Access Control (MAC) chip and a digital to analog converter (DAC) chip, where the MAC chip is configured to generate the one data signal, and the data signal generated by the MAC chip is usually a digital electrical signal, and the DAC chip is configured to convert the digital electrical signal into an analog electrical signal and transmit the analog electrical signal to the signal sending apparatus 100 according to this embodiment, so that the signal sending apparatus 100 modulates optical signals with n different wavelengths by using the one data signal. The data signal carries data to be transmitted, where the data to be transmitted may be audio data, video data, text data, or the like, and this is not limited in this embodiment of the application.
To sum up, the signal transmitting apparatus provided in the embodiment of the present application includes a modulation multiplexing module and a transmitting module, where the modulation multiplexing module may modulate and multiplex optical signals with n different wavelengths to obtain a target optical signal, and the transmitting module may transmit the target optical signal to an optical link. The target optical signal is obtained by modulating and multiplexing n optical signals with different wavelengths, so that the target optical signal is a superimposed signal of the n optical signals with different wavelengths, and the signal superimposing process plays an amplifying role, so that the optical power of the target optical signal sent by the signal sending device is higher, the intensity of a data signal carried by the target optical signal is higher, and the reliability of the target optical signal and the data signal carried by the target optical signal in long-distance transmission is ensured. Since it is not necessary to provide an optical amplifier in the signal transmission device, that is, the optical power of the optical signal and the intensity of the data signal carried by the optical signal are increased, it is possible to contribute to downsizing of the signal transmission device and reduction in cost of the signal transmission device.
For example, the modulation multiplexing module modulating the optical signals of n different wavelengths may include: the modulation multiplexing module modulates the intensity of the n optical signals with different wavelengths (i.e., modulates the amplitude of the optical signals), and/or modulates the frequency of the n optical signals with different wavelengths. The embodiments of the present application take the example of modulating the intensity of the n optical signals with different wavelengths.
In this embodiment of the application, the modulation multiplexing module may modulate the n optical signals with different wavelengths first and then multiplex the modulated n optical signals with different wavelengths (that is, modulate first and then multiplex), or multiplex the n optical signals with different wavelengths first and then modulate the multiplexed optical signals (that is, multiplex first and then modulate). The structure of the signal transmitting device is different according to the modulation and multiplexing sequence of the optical signals modulated by the modulation and multiplexing module. The signal transmitting apparatus according to the embodiment of the present application is described below in two cases according to the difference between the modulation and multiplexing order of the optical signal by the modulation and multiplexing module.
In the first case: the modulation multiplexing module modulates the n optical signals with different wavelengths, and then multiplexes the modulated n optical signals with different wavelengths (i.e., modulates the modulated optical signals before multiplexing).
Fig. 2 is a schematic structural diagram of another signal transmission apparatus 100 according to an embodiment of the present application. Fig. 2 and fig. 1 both take the example that the modulation and multiplexing module 110 modulates the n kinds of optical signals with different wavelengths first, and then multiplexes the modulated n kinds of optical signals with different wavelengths as an example. Referring to fig. 1 and 2, the modulation multiplexing module 110 includes: the optical system includes a modulation unit 111 and an optical multiplexer 112, where the modulation unit 111 is configured to modulate n optical signals with different wavelengths to obtain n modulated optical signals with different wavelengths, and the optical multiplexer 112 is configured to multiplex the n modulated optical signals with different wavelengths to obtain a target optical signal.
In this embodiment, the modulation unit 111 modulates the n optical signals with different wavelengths by using the associated data signal, so that the modulated n optical signals with different wavelengths include a first optical signal and a second optical signal with different wavelengths, and the first optical signal and the second optical signal with different wavelengths carry the associated data signal. For example, the modulation unit 111 modulates the n optical signals with different wavelengths one by using n related data signals, and obtains the modulated n optical signals with different wavelengths to carry the n related data signals in one-to-one correspondence, which is not limited in the embodiment of the present application.
The modulation unit 111 includes n output interfaces (not shown in fig. 1 and 2), and the optical multiplexer 112 includes n input interfaces (not shown in fig. 1 and 2) and one output interface, and the output interface of the optical multiplexer 112 is also the transmitting module 120. The n output interfaces of the modulation unit 111 are connected to the n input interfaces of the optical multiplexer 112 in a one-to-one correspondence manner, the modulation unit 111 inputs the modulated n optical signals with different wavelengths to the n input interfaces of the optical multiplexer 112 in a one-to-one correspondence manner through the n output interfaces, the optical multiplexer 112 multiplexes the modulated n optical signals with different wavelengths input from the n input interfaces in a one-to-one correspondence manner to obtain a target optical signal, the target optical signal includes a first optical signal and a second optical signal with different wavelengths, and the first optical signal and the second optical signal with different wavelengths carry the associated data signal. For example, the target optical signal includes optical signals of n different wavelengths, and the optical signals of n different wavelengths carry n paths of associated data signals in a one-to-one correspondence, which is not limited in this embodiment of the present application. For example, the optical multiplexer 112 may be a Multiplexer (MUX) or other device capable of multiplexing optical signals, which is not limited in this embodiment of the present invention.
In this embodiment, the modulation unit 111 may modulate the n optical signals with different wavelengths by using an internal modulation method, or may modulate the n optical signals with different wavelengths by using an external modulation method. The internal modulation is to directly modulate the optical signal by the light source (or directly use the data signal as the driving signal of the light source to excite the light source to emit light), and the external modulation is to modulate the optical signal emitted by the light source by the modulator. The structure of the modulation unit 111 differs according to the modulation scheme of the modulation unit 111. The modulation unit 111 in this first case is described below in two implementations, taking an inner modulation scheme and an outer modulation scheme as examples.
A first implementation of the first scenario: the modulation unit 111 modulates the optical signals of n different wavelengths by using an internal modulation scheme.
As shown in fig. 1, the modulation unit 111 includes n light sources 1111, the wavelengths of the optical signals emitted by the n light sources 1111 are different from each other, and the n light sources 1111 are configured to modulate the n optical signals with different wavelengths one to obtain the modulated n optical signals with different wavelengths, so that the modulated n optical signals with different wavelengths include a first optical signal and a second optical signal with different wavelengths, and the first optical signal and the second optical signal with different wavelengths carry associated data signals.
In this embodiment of the application, the n light sources 1111 may be driven to emit light by using n data signals including at least two associated data signals as driving signals of the n light sources 1111 in a one-to-one correspondence, so that the n light sources 1111 emit optical signals of n different wavelengths, and the optical signals of n different wavelengths at least include a first optical signal and a second optical signal carrying the associated data signals, thereby implementing modulation on the optical signals of n different wavelengths. For example, n paths of associated data signals are used as driving signals of the n light sources 1111 to drive the n light sources 1111 to emit light, so that the n light sources 1111 emit light signals with n different wavelengths. In the embodiment of the present application, n is 2 as an example, as shown in fig. 1, the modulation unit 111 includes 2 light sources 1111, where the light sources 1111 may be semiconductor Lasers (LDs) or other forms of light sources, and the light sources 1111 are not limited in the embodiment of the present application.
In a first implementation manner of the first case, each light source 1111 in the n light sources 1111 may have an output interface, n output interfaces of the n light sources 1111 are also n output interfaces of the modulation unit 111, the n output interfaces of the n light sources 1111 are connected to n input interfaces of the optical multiplexer 112 in a one-to-one correspondence manner, each light source 1111 in the n light sources 1111 transmits the optical signal sent by the light source to a corresponding input interface of the optical multiplexer 112 through the output interface of the light source, and the optical multiplexer 112 multiplexes the optical signals input by the n light sources 1111 to obtain the target optical signal.
Second implementation of the first case: the modulation unit 111 modulates the optical signals with n different wavelengths by using an external modulation method.
As shown in fig. 2, the modulation unit 111 includes n light sources 1111 and n modulators 1112, where the n light sources 1111 correspond to the n modulators 1112 one by one, each light source 1111 of the n light sources 1111 is configured to input an optical signal with one wavelength to the corresponding modulator 1112, the wavelengths of the optical signals input to the n modulators 1112 by the n light sources 1111 are different from each other, and the n modulators 1112 are configured to modulate the optical signals input by the n light sources 1111 one by one to obtain n modulated optical signals with different wavelengths, where the n modulated optical signals with different wavelengths include a first optical signal and a second optical signal with different wavelengths, and the first optical signal and the second optical signal with different wavelengths carry associated data signals.
In this embodiment of the application, the n light sources 1111 may be driven to emit light respectively, so that the n light sources 1111 input light signals to the corresponding modulators 1112 respectively, each modulator 1112 in the n modulators 1112 modulates the light signal input by the corresponding light source 1111 by using one path of data signal to obtain a modulated light signal with one wavelength, and data signals adopted when at least two modulators 1112 in the n modulators 1112 modulate the light signal input by the corresponding light source 1111 are associated, so that the n modulated light signals with different wavelengths obtained by the n modulators 1112 include a first light signal and a second light signal with different wavelengths, and the first light signal and the second light signal with different wavelengths carry associated data signals. For example, the n modulators 1112 modulate the n optical signals with different wavelengths input by the n optical sources 1111 in a one-to-one correspondence manner by using n paths of associated data signals to obtain n modulated optical signals with different wavelengths, where the n modulated optical signals with different wavelengths carry the n paths of associated data signals in a one-to-one correspondence manner. In the embodiment of the present application, taking n-2 as an example, as shown in fig. 2, the modulation unit 111 includes 2 light sources 1111 and 2 modulators 1112, where the light source 1111 may be an LD or other light source, and the modulator 1112 may be a device capable of modulating an optical signal, such as an optical modulator or an electro-absorption modulator (EAM).
In a second implementation manner of the first case, each light source 1111 of the n light sources 1111 has an output interface, each modulator 1112 of the n modulators 1112 may have two input interfaces and one output interface, one input interface of each modulator 1112 is connected to the output interface of the corresponding light source 1111, the other input interface is used for receiving a data signal, the n output interfaces of the modulation unit 111 are also the n output interfaces of the n modulators 1112, and the n output interfaces of the n modulators 1112 are connected to the n input interfaces of the optical multiplexer 112 in a one-to-one correspondence. Each light source 1111 of the n light sources 1111 transmits the optical signal sent by the light source 1111 to one input interface of the corresponding modulator 1112 through the output interface of the light source, each modulator 1112 of the n modulators 1112 modulates the optical signal input by the corresponding light source 1111 by using the data signal received by the other input interface of the modulator 1112, and transmits the modulated optical signal to the corresponding input interface of the optical multiplexer 112 through the output interface of the modulator 1112, and the optical multiplexer 112 multiplexes the optical signals input by the n modulators 1112 to obtain the target optical signal.
In the above two implementation manners, the modulation multiplexing module 110 may modulate the n optical signals with different wavelengths by using n paths of associated data signals, where the n paths of associated data signals may be obtained by copying one path of data signal or obtained by splitting one path of data signal, and the n paths of associated data signals may be considered to have the same information, and may be substantially one path of data signal. In this embodiment, taking the example that the n paths of associated data signals are obtained by splitting one path of data signal, as an optional implementation manner, the sending apparatus further includes a splitter, so as to split one path of data signal to obtain the n paths of associated data signals.
Illustratively, with continuing reference to fig. 1 and 2, the signal transmission apparatus 100 further includes: a splitter 130, where the splitter 130 is configured to divide one path of data signals into n paths of data signals before the modulation multiplexing module 110 modulates and multiplexes the n optical signals with different wavelengths, where the n paths of data signals are carried by the n optical signals with different wavelengths, which are included in the target optical signal obtained by modulating and multiplexing the n optical signals with different wavelengths, in a one-to-one correspondence manner, and the n paths of data signals are associated with each other. For example, the n data signals are the same, or every two of the n data signals are conjugated (i.e., any two data signals in the n data signals are conjugated), or every two of the n data signals are differential signals (i.e., any two data signals in the n data signals are differential signals). For example, n is 2, the splitter 130 may split one data signal into 2 data signals, where the 2 data signals are the same, or the 2 data signals are conjugate, or the 2 data signals are differential signals.
With continuing reference to fig. 1 and fig. 2, the signal transmitting apparatus 100 further includes: m delay (delay) devices 140, 1 m n, and m is an integer. The m delayers 140 are configured to respectively delay m data signals of the n data signals obtained by splitting the splitter 130 before the modulation multiplexing module 110 modulates and multiplexes the n optical signals with different wavelengths, that is, the m delayers 140 delay the m data signals in a one-to-one correspondence. The m data signals of the n data signals used by the modulation multiplexing module 110 to modulate the n optical signals with different wavelengths are m data signals delayed by the m delays 140. The m delayers 140 delay the m channels of data signals, so that when a target optical signal modulated and multiplexed by the modulation multiplexing module 110 is transmitted to a signal receiving apparatus through an optical link, n channels of data signals carried by n optical signals with different wavelengths included in the target optical signal are synchronized as much as possible.
In this embodiment, each of the n data signals corresponds to one delay 140, and the n delays 140 perform one-to-one delay on the n data signals, so that when a target optical signal is transmitted to a signal receiving apparatus through an optical link, n data signals carried by n optical signals with different wavelengths included in the target optical signal are synchronized as much as possible. Or, the m-n-1, the n-channels of data signals may include 1 channel of reference signal and n-1 channels of signals to be delayed, the n-1 delayers 140 may correspond to the n-1 channels of signals to be delayed one to one, and the n-1 delayers 140 may delay the n-1 channels of data signals respectively with reference to the 1 channel of reference signal, so that when a target optical signal is transmitted to a signal receiving apparatus through an optical link, n channels of data signals carried by n optical signals with different wavelengths included in the target optical signal are synchronized as much as possible.
Each of the m delayers 140 may have a delay value configured therein, and each delayer 140 may delay a corresponding data signal according to the delay value configured therein. The delay value configured in each delay unit 140 may be determined according to a transmission distance between the signal transmitting apparatus 100 and the signal receiving apparatus and a wavelength of an optical signal corresponding to the delay unit 140 (the optical signal corresponding to the delay unit 140 is also an optical signal corresponding to a path of data signal corresponding to the delay unit 140, and the optical signal corresponding to the data signal refers to an optical signal to be modulated by using the data signal). Because the transmission rates of the optical signals with different wavelengths in the same optical link are different, so that under the condition that the transmission distances are equal, the transmission delays of the optical signals with different wavelengths in the optical link are different, when the optical signals with different wavelengths are simultaneously transmitted from the signal sending device and transmitted to the same signal receiving device through the same optical link, the times when the optical signals with different wavelengths reach the signal receiving device are different, so that the times when the data signals carried by the optical signals with different wavelengths reach the signal receiving device are different, that is, the data signals carried by the optical signals with different wavelengths reach the signal receiving device asynchronously, which easily affects the recovery of the data signals carried by the optical signals by the signal receiving device. The delay value of the corresponding delayer is determined according to the transmission distance and the wavelength of the optical signal, so that the delayer delays the corresponding data signal according to the delay value, and n paths of data signals carried by the target optical signal can reach the signal receiving device as simultaneously as possible.
With continuing reference to fig. 1 and fig. 2, the signal transmitting apparatus 100 further includes: and an amplifying module 150, where the amplifying module 150 is configured to amplify the n channels of data signals obtained by splitting the splitter 130 before the modulation and multiplexing module 110 modulates and multiplexes the n optical signals with different wavelengths. The amplifying module 150 may include n drivers (drivers) 151, where the n drivers 151 are in one-to-one correspondence with the n data signals, and each driver 151 is configured to amplify a corresponding data signal. The m data signals of the n data signals amplified by the amplifying module 150 may be m data signals delayed by m delays 140, and the n data signals used by the modulation multiplexing module 110 to modulate the n optical signals with different wavelengths are the data signals amplified by the amplifying module 150. The amplification module 150 amplifies the n data signals, so as to increase the intensity of the n data signals, which is convenient for the modulation multiplexing module 110 to modulate the n optical signals with different wavelengths by using the n data signals.
In the second case: the modulation multiplexing module multiplexes n optical signals with different wavelengths, and then modulates the multiplexed optical signals (i.e., multiplexing first and then modulating).
Fig. 3 is a schematic structural diagram of another signal transmitting apparatus 200 according to an embodiment of the present application, where the signal transmitting apparatus 200 includes a modulation multiplexing module 210 and a transmitting module 220. The modulation multiplexing module 210 is configured to modulate and multiplex optical signals with n different wavelengths to obtain a target optical signal, where the target optical signal may include a first optical signal and a second optical signal, a wavelength of the first optical signal is different from a wavelength of the second optical signal, the first optical signal and the second optical signal carry associated data signals, n is an integer greater than 1, and for example, n ═ 2. The sending module 220 is configured to send the target optical signal to an optical link. As shown in fig. 3, the sending module 220 is integrated in the modulation multiplexing module 210, and the sending module 220 is an interface in the modulation multiplexing module 210 for connecting with an optical link. The transmitting module 220 may be implemented by an optical waveguide or a coupler, for example. The associated data signal is generated by a data signal, and the associated data signal may refer to the foregoing description, which is not repeated herein.
As shown in fig. 3, the modulation multiplexing module 210 includes: the optical signal multiplexing apparatus includes a multiplexing unit 211 and a modulator 212, where the multiplexing unit 211 is configured to multiplex n optical signals with different wavelengths to obtain a multiplexed optical signal, and the modulator 212 is configured to modulate the multiplexed optical signal to obtain a target optical signal, where the target optical signal includes a first optical signal and a second optical signal with different wavelengths, and the first optical signal and the second optical signal with different wavelengths carry associated data signals, for example, the first optical signal and the second optical signal with different wavelengths carry the same data signal. For example, the modulator 212 modulates the multiplexed optical signal with a data signal. For example, the modulator 212 copies a channel of data signal to obtain an associated data signal, and then the modulator 212 modulates the multiplexed optical signal with the associated data signal.
The multiplexing unit 211 may include an output interface (not shown in fig. 3), the modulator 212 includes two input interfaces (not shown in fig. 3) and an output interface (not shown in fig. 3), the output interface of the multiplexing unit 211 is connected to one input interface of the modulator 212, the other input interface of the modulator 212 is used for receiving a data signal, and the output interface of the modulator 212 is the sending module 220. The multiplexing unit 211 inputs the multiplexed optical signal to one input interface of the modulator 212 through its output interface, and the modulator 212 modulates the multiplexed optical signal input by the multiplexing unit 211 by using the data signal received from its other input interface to obtain a target optical signal, where the target optical signal includes a first optical signal and a second optical signal with different wavelengths, and the first optical signal and the second optical signal with different wavelengths carry associated data signals. For example, the target optical signal includes optical signals of n different wavelengths, and the optical signals of n different wavelengths carry the same data signal, which is not limited in this embodiment. Illustratively, the modulator 212 may be an optical modulator or an EAM or the like capable of modulating an optical signal. In the signal transmission device 200, the method for modulating the optical signal by the modulation multiplexing module 210 may be referred to as an indirect modulation method.
As shown in fig. 3, the multiplexing unit 211 includes: an optical multiplexer 2111 and n optical sources 2112, wherein each optical source 2112 of the n optical sources is configured to input an optical signal with one wavelength to the optical multiplexer 2111, the wavelengths of the optical signals input to the optical multiplexer 2111 by the n optical sources 2112 are different, and the optical multiplexer 2111 is configured to multiplex the optical signals input by the n optical sources 2112 to obtain a multiplexed optical signal. In the embodiment of the present application, n-2 is taken as an example, as shown in fig. 3, the multiplexing unit 211 includes 2 light sources 2112, where the light source 2112 may be an LD or other form of light source, and the optical multiplexer 2111 may be a MUX or other device capable of multiplexing optical signals, which is not limited in the embodiment of the present application.
Each light source 2112 of the n light sources 2112 may have an output interface, the optical multiplexer 2111 may have n input interfaces and an output interface, and the output interface of the optical multiplexer 2111 is also the output interface of the multiplexing unit 211. The n output interfaces of the n light sources 2112 are connected to the n input interfaces of the optical multiplexer 2111 in a one-to-one correspondence manner, and the n light sources 2112 can be driven to emit light respectively, so that each light source 2112 of the n light sources 2112 transmits the optical signal emitted by the light source to a corresponding input interface of the optical multiplexer 2111 through the output interface of the light source, and the optical multiplexer 2111 multiplexes the optical signals input by the n light sources 2112 to obtain a multiplexed optical signal.
With continued reference to fig. 3, the signal transmitting apparatus 200 further includes: an amplifying module 230, where the amplifying module 230 is configured to amplify a data signal before the modulator 212 modulates the multiplexed optical signal. For example, the amplifying module 230 includes a driver 231, and the driver 231 is configured to amplify the path of data signal. The modulator 212 may modulate the multiplexed optical signal with the amplified data signal to obtain a target optical signal, where n optical signals with different wavelengths included in the target optical signal include a first optical signal and a second optical signal, and both the first optical signal and the second optical signal carry the data signal, that is, both the first optical signal and the second optical signal carry the amplified data signal. In the embodiment of the present application, the amplifying module 230 amplifies the data signal, so as to increase the intensity of the data signal, which is convenient for the modulator 212 to modulate the multiplexed optical signal with the data signal.
The foregoing is a description of the signal transmitting apparatus of the present application, and it should be noted that the description of the embodiment of the present application with respect to the signal transmitting apparatus is only an example, and in practical applications, the signal transmitting apparatus may have more or less structures than the present application, for example, the signal transmitting apparatus may further include a MAC chip and/or a DAC chip, and for example, if the strength of the data signal transmitted from the data source to the signal transmitting apparatus is sufficiently large, the signal transmitting apparatus may also not include an amplifying module, and the embodiment of the present application is not limited thereto.
To sum up, the signal transmitting apparatus provided in the embodiment of the present application includes a modulation multiplexing module and a transmitting module, where the modulation multiplexing module may modulate and multiplex n optical signals with different wavelengths to obtain a target optical signal including a first optical signal and a second optical signal, and the transmitting module may transmit the target optical signal to an optical link, where a wavelength of the first optical signal is different from a wavelength of the second optical signal, and the first optical signal and the second optical signal carry associated data signals. Because the signal sending device modulates and multiplexes the n optical signals with different wavelengths and sends the optical signals to the optical link, the target optical signal sent by the signal sending device is a superposition signal of the n optical signals with different wavelengths, and the signal superposition process plays an amplifying role, so that the optical power of the target optical signal sent by the signal sending device is higher, the intensity of the data signal carried by the target optical signal is higher, and the reliability of the target optical signal and the data signal carried by the target optical signal in long-distance transmission is ensured. Since it is not necessary to provide an optical amplifier in the signal transmission device, that is, the optical power of the optical signal and the intensity of the data signal carried by the optical signal are increased, it is possible to contribute to the miniaturization of the signal transmission device and the reduction in cost of the signal transmission device.
Fig. 4 is a schematic structural diagram of a signal receiving apparatus 300 according to an embodiment of the present disclosure. Referring to fig. 4, the signal receiving apparatus 300 includes: a receiving module 310 and a photoelectric conversion module 320. The receiving module 310 is configured to receive a target optical signal through an optical link, where the target optical signal includes optical signals of n different wavelengths, where the optical signals of n different wavelengths include a first optical signal and a second optical signal, where the first optical signal and the second optical signal carry associated data signals, and n is an integer greater than 1. For example, in the embodiment of the present application, taking n-2 as an example, the target optical signal includes optical signals of 2 different wavelengths, and the optical signals of the 2 different wavelengths are the first optical signal and the second optical signal. The photoelectric conversion module 320 is configured to perform photoelectric conversion on the target optical signal to obtain a target electrical signal, where the target electrical signal includes the associated data signal. For example, the optical-to-electrical conversion module 320 first detects the target optical signal by direct detection or coherent detection, and then converts the detected target optical signal into a target electrical signal. In the embodiment of the present application, the receiving module 310 may be a module independent from the photoelectric conversion module 320 or a module integrated in the photoelectric conversion module 320, which is not limited in the embodiment of the present application. For example, as shown in fig. 4, the receiving module 310 is integrated in the optical-to-electrical conversion module 320, and the receiving module 310 is an interface of the optical-to-electrical conversion module 320 for connecting with an optical link. For example, the receiving module 310 may be implemented by an optical waveguide or a coupler, or the receiving module 310 may be a chip incident surface for implementing the photoelectric conversion module 320. The optical link is a link for transmitting an optical signal, and for example, the optical link may include an optical transmission medium such as an optical fiber, and may further include an optical device such as an optical amplifier and an optical connector.
In this embodiment, the target optical signal includes a first optical signal and a second optical signal that carry associated data signals, where the associated data signals are generated by a route of data signals, and the associated data signals can be considered to have the same information. For example, the associated data signal is obtained by copying a data signal, or the associated data signal is obtained by splitting a data signal, which is not limited in this embodiment of the present application. For example, the associated data signals are the same data signals, or the associated data signals are conjugate, or the associated data signals are differential signals. The associated data signals may refer to the foregoing description, and the description of the embodiments of the present application is omitted here.
The photoelectric conversion module 320 may be a PIN or an APD, and the sensitivity of both the PIN and the APD is high, so that the photoelectric conversion module 320 can sensitively detect a target optical signal. Illustratively, the PIN or APD first detects the target optical signal by direct detection or coherent detection, and then converts the detected target optical signal into a target electrical signal. The photoelectric conversion module 320 is a module configured based on a photoelectric effect principle, and the photoelectric effect principle is as follows: the PN junction of the photodiode is irradiated by the optical signal, so that the PN junction of the photodiode absorbs the optical energy of the optical signal to generate a carrier, and the optical signal is converted into an electrical signal. When the target optical signal received by the receiving module 310 is irradiated to the photoelectric conversion module 320, the photoelectric conversion module 320 may absorb optical energy of the target optical signal and generate carriers, thereby converting the target optical signal into a target electrical signal.
Referring to fig. 4, the signal receiving apparatus 300 further includes: and a processing module 330, where the processing module 330 is configured to perform digital signal processing on the target electrical signal converted by the photoelectric conversion module 320. For example, the target electrical signal converted by the photoelectric conversion module 320 may be an analog electrical signal, the processing module 330 may include an ADC chip 331 and a DSP chip 332, the ADC chip 331 is configured to convert the target electrical signal into a digital electrical signal, the DSP chip 332 is configured to perform DSP processing on the digital electrical signal, and the DSP-processed signal may be provided to the signal receiving apparatus 300.
Referring to fig. 4, the signal receiving apparatus 300 further includes: an amplifying module 340, where the amplifying module 340 is configured to amplify the target electrical signal obtained by the conversion of the photoelectric conversion module 320, and the processing module 330 is configured to perform digital signal processing on the amplified target electrical signal. When the photoelectric conversion module 320 performs photoelectric conversion on the target optical signal, a certain energy loss may occur, which results in that the intensity of the target electrical signal obtained by performing photoelectric conversion on the photoelectric conversion module 320 is relatively low, so that the amplification module 340 may be used to amplify the target electrical signal obtained by converting the photoelectric conversion module 320, which may be convenient for the processing module 330 to process the target electrical signal. The amplifying module 340 may include at least one of a trans-impedance amplifier (TIA) that may amplify, shape, and regenerate the target electrical signal, and an Automatic Gain Control (AGC) circuit that may gain control the target electrical signal such that the target electrical signal is stably output to the processing module 330.
The above is a description of the signal receiving device of the present application, and it should be noted that the description of the embodiment of the present application with respect to the signal receiving device is merely an example, and in practical applications, the signal receiving device may have more or less structures than the present application, for example, if the intensity of the target electrical signal converted by the photoelectric conversion module is sufficiently large, the signal receiving device may also not include the amplification module, and the embodiment of the present application is not limited thereto.
To sum up, the signal receiving apparatus provided in the embodiment of the present application includes a receiving module and an optical-to-electrical conversion module, where after the receiving module receives a target optical signal that is obtained by modulating and multiplexing n optical signals with different wavelengths and is sent by a signal sending apparatus, the optical-to-electrical conversion module converts the target optical signal into a target electrical signal, so as to obtain associated data signals carried by a first optical signal and a second optical signal in the target optical signal, and since the first optical signal and the second optical signal carry associated data signals, the associated data signals can be generated by one data signal, and it can be considered that the associated data signals have the same information, so that the signal receiving apparatus can directly perform optical-to-electrical conversion on the target optical signal to obtain the target electrical signal without demultiplexing the target optical signal including the first optical signal and the second optical signal, therefore, a demultiplexer does not need to be arranged in the signal receiving device, which is beneficial to realizing the miniaturization of the signal receiving device and reducing the cost of the signal receiving device. And because the target optical signal is sent after the signal sending device modulates and multiplexes the optical signals with n different wavelengths, the target optical signal sent by the signal sending device is a superposition signal of the optical signals with n different wavelengths, the signal superposition process plays an amplifying role, the optical power of the target optical signal sent by the signal sending device is higher, the intensity of the data signal carried by the target optical signal is higher, the reliability of the target optical signal and the data signal carried by the target optical signal in long-distance transmission is ensured, and the signal receiving device can conveniently and correctly demodulate the data signal from the target optical signal.
Based on the same inventive concept, the embodiment of the present application provides an optical transmission system, which includes the signal sending device and the signal receiving device provided by the foregoing embodiments. Fig. 5 is a schematic structural diagram of an optical transmission system provided in an embodiment of the present application, and referring to fig. 5, the optical transmission system includes a signal transmitting apparatus 100 (or a signal transmitting apparatus 200) and a signal receiving apparatus 300, where the signal transmitting apparatus 100 (or the signal transmitting apparatus 200) and the signal receiving apparatus 300 are connected by an optical link 400. The optical link 400 may include an optical fiber or other optical transmission medium, and may further include optical devices such as an optical amplifier and an optical connector.
As described above, the signal transmitting apparatus provided in the embodiment of the present application may include three possible structures, as shown in fig. 1 to 3, respectively, and the signal receiving apparatus 300 may be connected to the signal transmitting apparatus shown in any one of fig. 1 to 3 to form an optical transmission system, so that the optical transmission system provided in the embodiment of the present application may include three possible implementation manners.
The first implementation mode comprises the following steps: the signal receiving apparatus 300 and the signal transmitting apparatus 100 shown in fig. 1 are connected by an optical link 400 to constitute an optical transmission system. Fig. 6 is a schematic structural diagram of another optical transmission system provided in an embodiment of the present application, where the optical transmission system includes the signal sending apparatus 100 shown in fig. 1 and the signal receiving apparatus 300 shown in fig. 4, and the signal sending apparatus 100 is connected to the signal receiving apparatus 300 through an optical link 400. The structure of the signal transmitting apparatus 100 may refer to the related description of the embodiment shown in fig. 1, and the structure of the signal receiving apparatus 300 may refer to the related description of the embodiment shown in fig. 4, which is not repeated herein.
The second implementation mode comprises the following steps: the signal receiving apparatus 300 and the signal transmitting apparatus 100 shown in fig. 2 are connected by an optical link 400 to constitute an optical transmission system. Fig. 7 is a schematic structural diagram of another optical transmission system provided in an embodiment of the present application, where the optical transmission system includes the signal transmitting apparatus 100 shown in fig. 2 and the signal receiving apparatus 300 shown in fig. 4, and the signal transmitting apparatus 100 and the signal receiving apparatus 300 are connected by an optical link 400. The structure of the signal transmitting apparatus 100 may refer to the related description of the embodiment shown in fig. 2, and the structure of the signal receiving apparatus 300 may refer to the related description of the embodiment shown in fig. 4, which is not repeated herein.
The third implementation mode comprises the following steps: the signal receiving apparatus 300 and the signal transmitting apparatus 200 shown in fig. 3 are connected by an optical link to constitute an optical transmission system. Fig. 8 is a schematic structural diagram of another optical transmission system provided in an embodiment of the present application, where the optical transmission system includes the signal transmitting apparatus 200 shown in fig. 3 and the signal receiving apparatus 300 shown in fig. 4, and the signal transmitting apparatus 200 and the signal receiving apparatus 300 are connected by an optical link 400. The structure of the signal transmitting apparatus 200 may refer to the related description of the embodiment shown in fig. 3, and the structure of the signal receiving apparatus 300 may refer to the related description of the embodiment shown in fig. 4, which is not repeated herein.
To sum up, the optical transmission system provided in the embodiment of the present application includes a signal sending device and a signal receiving device, where the signal sending device may modulate and multiplex optical signals with n different wavelengths to obtain a target optical signal including a first optical signal and a second optical signal, and send the target optical signal to the signal receiving device, where the wavelength of the first optical signal is different from that of the second optical signal, and the first optical signal and the second optical signal carry associated data signals; after the signal receiving device receives the target optical signal, the signal receiving device performs photoelectric conversion on the target optical signal to obtain a target electrical signal including the associated data signal, that is, the signal receiving device recovers the data signal from the target optical signal. Because the signal sending device modulates and multiplexes the n optical signals with different wavelengths and sends the optical signals to the signal receiving device, the target optical signal sent by the signal sending device is a superposition signal of the n optical signals with different wavelengths, and the signal superposition process plays an amplifying role, so that the optical power of the target optical signal sent by the signal sending device is higher, the intensity of the data signal carried by the target optical signal is higher, the reliability of the target optical signal and the data signal carried by the target optical signal in long-distance transmission is ensured, and the data signal can be conveniently and correctly demodulated from the target optical signal by the signal receiving device. In addition, the associated data signal carried by the target optical signal may be generated by a data signal, and the associated data signal may be considered to have the same information, so that the signal receiving apparatus may directly perform the optical-to-electrical conversion on the target optical signal to obtain the target electrical signal without demultiplexing the target optical signal. Therefore, the optical power of the optical signal and the intensity of the data signal carried by the optical signal can be improved without arranging an optical amplifier in the signal sending device, the data signal can be correctly demodulated from the optical signal without arranging a demultiplexer in the signal receiving device, the miniaturization of the signal sending device and the signal receiving device is facilitated, the cost of the signal sending device and the signal receiving device is reduced, and the cost of an optical transmission system comprising the signal sending device and the signal receiving device is reduced.
The following are examples of the method of the present application, which may be referred to by way of example and apparatus.
Fig. 9 is a flowchart of a signal transmission method according to an embodiment of the present application, where the signal transmission method is applied to a signal transmission apparatus shown in any one of fig. 1 to fig. 3, and the signal transmission apparatus may include a modulation multiplexing module and a transmission module. Referring to fig. 9, the method may include the steps of:
step 901, a modulation multiplexing module modulates and multiplexes n optical signals with different wavelengths to obtain a target optical signal, where the target optical signal includes a first optical signal and a second optical signal, the wavelength of the first optical signal is different from the wavelength of the second optical signal, the first optical signal and the second optical signal carry associated data signals, and n is an integer greater than 1.
The modulation multiplexing module modulates n optical signals with different wavelengths by using associated data signals, so that a target optical signal obtained through modulation and multiplexing includes a first optical signal and a second optical signal with different wavelengths, and the first optical signal and the second optical signal with different wavelengths carry the associated data signals. The detailed implementation of this step 901 will be described below, and will not be described herein.
In step 902, the sending module sends the target optical signal to the optical link.
The transmission module may be a module separate from the modulation multiplexing module or a module integrated in the modulation multiplexing module, for example, the transmission module is an interface in the modulation multiplexing module for connecting with an optical link. The transmitting module may be connected to the optical link to transmit the target optical signal to the optical link. The optical link is a link for transmitting an optical signal, and for example, the optical link may include an optical transmission medium such as an optical fiber, and may further include an optical device such as an optical amplifier and an optical connector. The target optical signal includes a first optical signal and a second optical signal, the first optical signal and the second optical signal carrying associated data signals. Wherein the associated data signals are generated by a data signal, and the associated data signals can be considered to have the same information. For example, the associated data signal is obtained by copying a data signal, or the associated data signal is obtained by splitting a data signal. For example, the associated data signals are the same data signals, or the associated data signals are conjugate, or the associated data signals are differential signals.
In this embodiment of the application, the modulation multiplexing module may modulate n optical signals with different wavelengths first and then multiplex the modulated n optical signals with different wavelengths to obtain the target optical signal, or the modulation multiplexing module may multiplex the n optical signals with different wavelengths first and then modulate the multiplexed optical signal to obtain the target optical signal. Depending on the modulation of the modulation and multiplexing order of the modulation and multiplexing module, this step 901 may include the following two cases.
In the first case: the modulation multiplexing module firstly modulates the n optical signals with different wavelengths to obtain the n modulated optical signals with different wavelengths, and then multiplexes the n modulated optical signals with different wavelengths to obtain the target optical signal. Wherein the first case may correspond to the signal transmission apparatus shown in fig. 1 or fig. 2.
The modulation multiplexing module may include a modulation unit and an optical multiplexer, where the modulation unit is configured to modulate n optical signals with different wavelengths to obtain n modulated optical signals with different wavelengths, and the optical multiplexer is configured to multiplex the n modulated optical signals with different wavelengths to obtain the target optical signal. For example, the modulation unit may modulate the n optical signals with different wavelengths by using the associated data signals, so that the modulated n optical signals with different wavelengths include a first optical signal and a second optical signal with different wavelengths, and the first optical signal and the second optical signal with different wavelengths carry the associated data signals. For example, the modulation unit modulates the n optical signals with different wavelengths one by using n related data signals, and obtains the n modulated optical signals with different wavelengths, which carry the n related data signals in one-to-one correspondence.
Illustratively, fig. 10 is a flowchart of modulating and multiplexing optical signals with n different wavelengths according to an embodiment of the present application, and referring to fig. 10, the method may include the following steps:
in substep 9011A, the modulation unit modulates the n optical signals with different wavelengths to obtain the n modulated optical signals with different wavelengths.
The modulation unit may modulate the n optical signals with different wavelengths by using an internal modulation method, or may modulate the n optical signals with different wavelengths by using an external modulation method. Depending on the modulation scheme of the modulation unit, the sub-step 9011A may include the following two possible implementations:
a first implementation of the first scenario: the modulation unit modulates the optical signals with n different wavelengths by adopting an internal modulation mode. Wherein the first implementation may correspond to the signal transmission apparatus shown in fig. 1.
The modulation unit may include n light sources, where the wavelengths of the optical signals emitted by the n light sources are different from each other, and the n light sources are configured to perform one-to-one modulation on the n optical signals with different wavelengths to obtain n modulated optical signals with different wavelengths, so that the n modulated optical signals with different wavelengths include a first optical signal and a second optical signal with different wavelengths, and the first optical signal and the second optical signal with different wavelengths carry associated data signals. The n light sources can be driven to emit light by using n data signals at least comprising two paths of associated data signals as driving signals of the n light sources in a one-to-one correspondence manner, so that the n light sources emit n optical signals with different wavelengths, and the n optical signals with different wavelengths at least comprise a first optical signal and a second optical signal which carry the associated data signals, thereby realizing the modulation of the n optical signals with different wavelengths. Illustratively, n paths of related data signals are used as driving signals of the n light sources in a one-to-one correspondence manner to drive the n light sources to emit light, so that the n light sources emit light signals with n different wavelengths.
Second implementation of the first case: the modulation unit modulates the n optical signals with different wavelengths by adopting an external modulation mode. Wherein the first implementation may correspond to the signal transmission apparatus shown in fig. 2.
The modulation unit may include n optical sources and n modulators, where the n optical sources are in one-to-one correspondence with the n modulators, each optical source in the n optical sources is configured to input an optical signal with one wavelength to a corresponding modulator, and wavelengths of the optical signals input by the n optical sources to the n modulators are different from each other, the n modulators are configured to modulate the optical signals input by the n optical sources in one-to-one correspondence to obtain n modulated optical signals with different wavelengths, where the n modulated optical signals with different wavelengths include a first optical signal and a second optical signal with different wavelengths, and the first optical signal and the second optical signal with different wavelengths carry associated data signals. The n light sources can be driven to emit light respectively, so that the n light sources respectively emit light to optical signals input to corresponding modulators, each modulator in the n modulators modulates the optical signals input to the corresponding light source by using a data signal to obtain modulated optical signals with one wavelength, and data signals adopted when at least two modulators in the n modulators modulate the optical signals input to the corresponding light sources are associated, so that the n modulated optical signals with different wavelengths include first optical signals and second optical signals with different wavelengths, and the first optical signals and the second optical signals with different wavelengths carry associated data signals. Illustratively, the n modulators modulate the n optical signals with different wavelengths input by the n optical sources one to one by using n paths of associated data signals to obtain n modulated optical signals with different wavelengths, where the n modulated optical signals with different wavelengths carry the n paths of associated data signals one to one.
In substep 9012A, the optical multiplexer multiplexes the modulated optical signals with n different wavelengths to obtain a target optical signal.
The modulation unit may include n output interfaces, the optical multiplexer may include n input interfaces, the n output interfaces of the modulation unit are connected to the n input interfaces of the optical multiplexer in a one-to-one correspondence, the modulation unit inputs n optical signals with different wavelengths to the n input interfaces of the optical multiplexer in a one-to-one correspondence through the n output interfaces, and the optical multiplexer multiplexes the n optical signals with different wavelengths received from the n input interfaces to obtain a target optical signal. For example, corresponding to the first implementation in the foregoing sub-step 9011A, the n output interfaces of the modulation unit may be n output interfaces of n light sources; corresponding to the second implementation manner in sub-step 9011A, the n output interfaces of the modulation unit may be n output interfaces of n modulators, which is not limited in this embodiment of the application.
As can be seen from the above description of the two implementation manners, in the first case, the modulation multiplexing module may modulate the optical signals with n different wavelengths by using n associated data signals, where the n associated data signals may be obtained by copying one data signal or obtained by splitting one data signal. In the embodiment of the present application, taking the n paths of associated data signals as an example for description, if the n paths of associated data signals are obtained by splitting one path of data signals, as an optional implementation manner, as shown in fig. 1 and fig. 2, the sending apparatus further includes a splitter, and before the modulation and multiplexing module modulates and multiplexes the n optical signals with different wavelengths, the method further includes: the splitter splits a data signal into n data signals. The modulation unit in the modulation multiplexing module may modulate n optical signals with different wavelengths one to one by using n data signals obtained by splitting by the splitter to obtain n modulated optical signals with different wavelengths, where the n modulated optical signals with different wavelengths carry the n data signals one to one, and the optical multiplexer in the modulation multiplexing module may multiplex the n modulated optical signals with different wavelengths to obtain a target optical signal, where the target optical signal includes n optical signals with different wavelengths, and the n optical signals with different wavelengths included in the target optical signal carry the n data signals one to one.
As shown in fig. 1 and fig. 2, the signal transmitting apparatus further includes m time delays, and before the modulation multiplexing module modulates and multiplexes the optical signals with n different wavelengths, the method further includes: the m delayers respectively delay m paths of data signals in the n paths of data signals obtained by branching the branching device, namely, the m delayers correspondingly delay the m paths of data signals one by one. For example, each of the m delays is configured with a delay value, and each delay may delay the corresponding data signal according to the delay value configured therein. The delay value configured in each delay unit may be determined according to a transmission distance between the signal transmitting device and the signal receiving device and a wavelength of the optical signal corresponding to the delay unit. M data signals in the n data signals used by the modulation multiplexing module for modulating the n optical signals with different wavelengths are m data signals delayed by the m time delayers. The m delayers delay the m paths of data signals, so that when a target optical signal obtained by modulation and multiplexing through the modulation and multiplexing module is transmitted to a signal receiving device through an optical link, n paths of data signals carried by n optical signals with different wavelengths included in the target optical signal are as synchronous as possible.
In this embodiment of the present application, each of n data signals corresponds to one delayer, and the n delayers perform one-to-one delay on the n data signals, so that when a target optical signal is transmitted to a signal receiving apparatus through an optical link, n data signals carried by n optical signals with different wavelengths included in the target optical signal are as synchronous as possible. Or, the m-n-1, the n-channels of data signals may include 1 channel of reference signals and n-1 channels of signals to be delayed, the n-1 delayers may correspond to the n-1 channels of signals to be delayed one to one, and the n-1 delayers may delay the n-1 channels of data signals respectively with reference to the 1 channel of reference signals, so that when a target optical signal is transmitted to a signal receiving apparatus through an optical link, n channels of data signals carried by n optical signals with different wavelengths included in the target optical signal are as synchronized as possible.
As shown in fig. 1 and 2, the signal transmitting apparatus further includes an amplifying module. Before the modulation multiplexing module modulates and multiplexes the optical signals with n different wavelengths, the method further comprises: and the amplifying module amplifies the delayed n paths of data signals. The n paths of data signals used by the modulation multiplexing module for modulating the n optical signals with different wavelengths are data signals amplified by the amplifying module, and the amplifying module is used for amplifying the n paths of delayed data signals, so that the modulation multiplexing module can modulate the n optical signals with different wavelengths by using the n paths of amplified data signals.
In the second case: the modulation multiplexing module multiplexes the optical signals with n different wavelengths to obtain multiplexed optical signals, and then modulates the multiplexed optical signals to obtain target optical signals. Wherein the second case may correspond to the signal transmission apparatus shown in fig. 3.
The modulation multiplexing module may include a multiplexing unit and a modulator, where the multiplexing unit is configured to multiplex n optical signals with different wavelengths to obtain a multiplexed optical signal, and the modulator is configured to modulate the multiplexed optical signal to obtain a target optical signal, where the target optical signal includes a first optical signal and a second optical signal with different wavelengths, and the first optical signal and the second optical signal with different wavelengths carry associated data signals, for example, the first optical signal and the second optical signal with different wavelengths carry the same data signal.
For example, fig. 11 is another flowchart for modulating and multiplexing optical signals with n different wavelengths according to the embodiment of the present application, and referring to fig. 11, the method may include the following steps:
in substep 9011B, the multiplexing unit multiplexes the n optical signals with different wavelengths to obtain a multiplexed optical signal.
The multiplexing unit may include an optical multiplexer and n optical sources, where each optical source of the n optical sources is configured to input an optical signal with one wavelength to the optical multiplexer, the wavelengths of the optical signals input to the optical multiplexer by the n optical sources are different from each other, and the optical multiplexer is configured to multiplex the optical signals input by the n optical sources to obtain the multiplexed optical signal. For example, each of the n light sources has an output interface, the optical multiplexer has n input interfaces and an output interface, and the output interface of the optical multiplexer is also the output interface of the multiplexing unit. The n output interfaces of the n light sources are connected with the n input interfaces of the optical multiplexer in a one-to-one correspondence manner, and the n light sources can be driven to respectively emit light, so that each light source in the n light sources transmits the optical signal emitted by the light source to the corresponding input interface of the optical multiplexer through the output interface of the light source, and the optical multiplexer multiplexes the optical signals input by the n light sources to obtain the multiplexed optical signal.
In substep 9012B, the modulator modulates the multiplexed optical signal to obtain a target optical signal.
The modulator may modulate the multiplexed optical signal with a single data signal. Illustratively, the modulator copies a channel of data signals to obtain associated data signals, and then the modulator modulates the multiplexed optical signals with the associated data signals. For example, the modulator includes two input interfaces and an output interface, the output interface of the multiplexing unit is connected to one input interface of the modulator, the other input interface of the modulator is used for receiving a data signal, and the output interface of the modulator is also a transmitting module. The multiplexing unit inputs the multiplexed optical signal into one input interface of the modulator through an output interface of the multiplexing unit, the modulator modulates the multiplexed optical signal input by the multiplexing unit by using the data signal received from the other input interface of the modulator to obtain a target optical signal, the target optical signal comprises a first optical signal and a second optical signal with different wavelengths, and the first optical signal and the second optical signal with different wavelengths carry associated data signals. For example, the target optical signal includes n optical signals with different wavelengths, and the n optical signals with different wavelengths carry the same data signal.
As shown in fig. 3, the signal transmitting apparatus further includes an amplifying module. Before the modulator modulates the multiplexed optical signal, the method further includes: the amplification module amplifies one path of data signal. The data signal used by the modulator to modulate the multiplexed optical signal is the data signal amplified by the amplifying module, and the amplifying module is used to amplify the data signal, so that the intensity of the data signal can be increased, and the modulator can modulate the multiplexed optical signal by using the amplified data signal conveniently.
To sum up, in the signal sending method provided in the embodiment of the present application, the modulation multiplexing module may modulate and multiplex n optical signals with different wavelengths to obtain a target optical signal including a first optical signal and a second optical signal, and the sending module may send the target optical signal to an optical link, where a wavelength of the first optical signal is different from a wavelength of the second optical signal, and the first optical signal and the second optical signal carry associated data signals. The target optical signal is obtained by modulating and multiplexing n optical signals with different wavelengths, so that the target optical signal is a superposed signal of the n optical signals with different wavelengths, the signal superposition process plays an amplifying role, the optical power of the target optical signal is higher, the intensity of a data signal carried by the target optical signal is higher, and the reliability of the target optical signal and the data signal carried by the target optical signal in long-distance transmission is ensured. Since it is not necessary to provide an optical amplifier in the signal transmission device, that is, the optical power of the optical signal and the intensity of the data signal carried by the optical signal are increased, it is possible to contribute to downsizing of the signal transmission device and reduction in cost of the signal transmission device.
Fig. 12 is a flowchart of a signal receiving method according to an embodiment of the present application, where the signal receiving method is applied to the signal receiving apparatus 300 shown in fig. 4, and the signal receiving apparatus 300 includes a receiving module 310 and a photoelectric conversion module 320. Referring to fig. 12, the method may include the steps of:
step 1201, a receiving module receives a target optical signal through an optical link, where the target optical signal includes n optical signals with different wavelengths, the n optical signals with different wavelengths include a first optical signal and a second optical signal, the first optical signal and the second optical signal carry associated data signals, and n is an integer greater than 1.
The receiving module may be a module independent from the photoelectric conversion module or a module integrated in the photoelectric conversion module, for example, the receiving module is an interface in the photoelectric conversion module for connecting with an optical link. The receiving module may be coupled to the optical link to receive the target optical signal over the optical link. The optical link is a link for transmitting an optical signal, and for example, the optical link may include an optical transmission medium such as an optical fiber, and may further include an optical device such as an optical amplifier and an optical connector. The target optical signal includes n different wavelength optical signals including a first optical signal and a second optical signal, the first and second optical signals carrying associated data signals. Wherein the associated data signal is generated by a route data signal. For example, the associated data signal is obtained by copying a data signal, or the associated data signal is obtained by splitting a data signal. For example, the associated data signals are the same data signals, or the associated data signals are conjugate, or the associated data signals are differential signals.
In step 1202, the photoelectric conversion module performs photoelectric conversion on the target optical signal to obtain a target electrical signal, where the target electrical signal includes the associated data signal.
The photoelectric conversion module may first detect the target optical signal by direct detection or coherent detection, and then convert the detected target optical signal into a target electrical signal. Illustratively, the photoelectric conversion module can be a PIN or an APD, and the sensitivity of the PIN and the APD is high, so that the photoelectric conversion module can sensitively detect the target optical signal. The photoelectric conversion module may be a module arranged based on a photoelectric effect principle, and when a target optical signal received by the receiving module is irradiated to the photoelectric conversion module, the photoelectric conversion module may absorb optical energy of the target optical signal and generate carriers, thereby converting the target optical signal into a target electrical signal. Wherein the target optical signal carries an associated data signal, and after converting the target optical signal into a target electrical signal, the target electrical signal may include the associated data signal.
As shown in fig. 4, the signal receiving apparatus further includes a processing module, and after the photoelectric conversion module performs photoelectric conversion on the target optical signal to obtain a target electrical signal, the method further includes: the processing module carries out digital signal processing on the target electric signal. For example, the processing module may include an ADC chip that may convert the target electrical signal into a digital electrical signal and a DSP chip that may DSP-process the digital electrical signal.
As shown in fig. 4, the signal receiving apparatus further includes an amplifying module, and after the photoelectric conversion module performs photoelectric conversion on the target optical signal to obtain a target electrical signal, the method further includes: the amplifying module amplifies the target electric signal. The processing module can perform digital signal processing on the amplified target electrical signal. Certain energy loss can occur when the photoelectric conversion module performs photoelectric conversion on a target optical signal, so that the intensity of the target electrical signal obtained by performing photoelectric conversion on the photoelectric conversion module is low, and therefore the target electrical signal obtained by converting the photoelectric conversion module can be amplified by the amplification module, so that the target electrical signal can be conveniently processed by the processing module.
To sum up, in the signal receiving method provided in the embodiment of the present application, after the receiving module receives the target optical signal that is sent by the signal sending device and obtained by modulating and multiplexing the optical signals with n different wavelengths, the optical-to-electrical conversion module converts the target optical signal into the target electrical signal, so as to obtain the associated data signals carried by the first optical signal and the second optical signal in the target optical signal, because the first optical signal and the second optical signal carry the associated data signals, the associated data signals can be generated from one data signal, and the associated data signals can be considered to have the same information, so that the signal receiving device can directly perform optical-to-electrical conversion on the target optical signal without demultiplexing the target optical signal including the first optical signal and the second optical signal, so as to obtain the target electrical signal, so that a demultiplexer does not need to be arranged in the signal receiving device, this contributes to the miniaturization of the signal receiving apparatus and the reduction of the cost of the signal receiving apparatus. And because the target optical signal is sent after the signal sending device modulates and multiplexes the optical signals with n different wavelengths, the target optical signal sent by the signal sending device is a superposition signal of the optical signals with n different wavelengths, the signal superposition process plays an amplifying role, the optical power of the target optical signal sent by the signal sending device is higher, the intensity of the data signal carried by the target optical signal is higher, the reliability of the target optical signal and the data signal carried by the target optical signal in long-distance transmission is ensured, and the signal receiving device can conveniently and correctly demodulate the data signal from the target optical signal.
Embodiments of the present application provide a chip, where the chip includes a programmable logic circuit and/or a program instruction, and when the chip operates, the signal sending method or the signal receiving method provided in the above embodiments are implemented.
In the above embodiments, all or part may be implemented by hardware, firmware, or any combination thereof. For example, the modulation multiplexing module may be implemented by combining hardware such as a modulator, an optical multiplexer, and a light source, the delay unit may be implemented by hardware such as a delay circuit, and the amplification module may be implemented by hardware such as a driver. For example, the photoelectric conversion module may be implemented by a PIN or an APD, and the function of the processing module may be implemented by firmware in which program instructions are embedded. Where implemented using hardware or firmware, the hardware or firmware may comprise programmable logic circuitry and/or program instructions. When loaded and executed on an optical communications device, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The program instructions may be fixed in processing circuitry of the optical communication device, such as processing circuitry in a DSP chip.
In this application, the terms "first" and "second," etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise. The term "and/or" is merely an associative relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.
It should be noted that: in the signal transmitting apparatus and the signal receiving apparatus provided in the foregoing embodiments, when the signal transmitting method is executed, and the signal receiving method is executed by the signal receiving apparatus, only the division of the above functional modules is taken as an example, in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules, so as to complete all or part of the functions described above. In addition, the embodiments of the signal sending apparatus, the signal receiving apparatus, the optical transmission system, the signal sending method, and the signal receiving method provided in the foregoing embodiments belong to the same concept, and specific implementation processes thereof are detailed in the embodiments of the methods and are not described herein again.
Those skilled in the art will appreciate that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be solidified in a processing circuit, and the processing circuit mentioned above may be a processing circuit in a DSP chip, or the like.
The above description is only an exemplary embodiment of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present application, and these modifications or substitutions should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (31)

1. A signal transmission device, comprising: a modulation multiplexing module and a transmitting module;
the modulation multiplexing module is configured to modulate and multiplex optical signals with n different wavelengths to obtain a target optical signal, where the target optical signal includes a first optical signal and a second optical signal, the wavelength of the first optical signal is different from the wavelength of the second optical signal, the first optical signal and the second optical signal carry associated data signals, and n is an integer greater than 1;
the sending module is used for sending the target optical signal to an optical link.
2. The signal transmission apparatus according to claim 1,
the associated data signal is generated by a route data signal.
3. The signal transmission apparatus according to claim 1 or 2,
the associated data signals are the same data signal; or,
the associated data signal conjugate; or,
the associated data signal is a differential signal.
4. The signal transmission apparatus according to any one of claims 1 to 3,
the modulation multiplexing module includes: a modulation unit and an optical multiplexer;
the modulation unit is used for modulating the n optical signals with different wavelengths to obtain n modulated optical signals with different wavelengths;
the optical multiplexer is used for multiplexing the modulated n optical signals with different wavelengths to obtain the target optical signal.
5. The signal transmission apparatus according to claim 4,
the modulation unit comprises n light sources, and the wavelengths of optical signals emitted by the n light sources are different;
the n light sources are used for modulating the n optical signals with different wavelengths in a one-to-one correspondence manner, so as to obtain the modulated n optical signals with different wavelengths.
6. The signal transmission apparatus according to claim 4,
the modulation unit comprises n light sources and n modulators, and the n light sources correspond to the n modulators one by one;
each of the n optical sources is configured to input an optical signal with one wavelength to a corresponding modulator, and the wavelengths of the optical signals input to the n modulators by the n optical sources are different from each other;
the n modulators are used for modulating the optical signals input by the n light sources in a one-to-one correspondence manner to obtain the modulated optical signals with n different wavelengths.
7. The signal transmission apparatus according to any one of claims 1 to 6,
the signal transmission device further includes: a splitter;
the splitter is configured to split one data signal into n data signals before the modulation multiplexing module modulates and multiplexes the n optical signals with different wavelengths;
the target optical signal includes n optical signals with different wavelengths, and the n optical signals with different wavelengths carry the n data signals in a one-to-one correspondence.
8. The signal transmission apparatus according to claim 7,
the signal transmission device further includes: m delayers, m is more than or equal to 1 and less than or equal to n, and m is an integer;
the m time delays are used for respectively delaying m paths of data signals in the n paths of data signals before the modulation multiplexing module modulates and multiplexes the n optical signals with different wavelengths.
9. The signal transmission apparatus according to claim 7 or 8,
the signal transmission device further includes: an amplifying module;
the amplifying module is used for amplifying the n paths of data signals before the modulation multiplexing module modulates and multiplexes the n optical signals with different wavelengths.
10. A signal receiving apparatus, comprising: a receiving module and a photoelectric conversion module;
the receiving module is configured to receive a target optical signal through an optical link, where the target optical signal includes n optical signals with different wavelengths, the n optical signals with different wavelengths include a first optical signal and a second optical signal, the first optical signal and the second optical signal carry associated data signals, and n is an integer greater than 1;
the photoelectric conversion module is used for performing photoelectric conversion on the target optical signal to obtain a target electric signal, and the target electric signal comprises the associated data signal.
11. The signal receiving apparatus of claim 10,
the associated data signal is generated by a route data signal.
12. The signal transmission apparatus according to claim 10 or 11,
the associated data signals are the same data signal; or,
the associated data signal conjugate; or,
the associated data signal is a differential signal.
13. The signal receiving apparatus according to any one of claims 10 to 12,
the signal receiving apparatus further includes: a processing module;
the processing module is used for carrying out digital signal processing on the target electric signal.
14. An optical transmission system, comprising:
the signal transmission device according to any one of claims 1 to 9, and the signal reception device according to any one of claims 10 to 13, the signal transmission device and the signal reception device being connected by an optical link.
15. The optical transmission system of claim 14,
when the optical transmission system includes the signal transmission apparatus according to claim 1, the modulation multiplexing module includes: a multiplexing unit and a modulator;
the multiplexing unit is used for multiplexing the n optical signals with different wavelengths to obtain multiplexed optical signals;
and the modulator is used for modulating the multiplexed optical signal to obtain the target optical signal.
16. The optical transmission system of claim 15,
the multiplexing unit includes: an optical multiplexer and n light sources;
each of the n optical sources is configured to input an optical signal with one wavelength to the optical multiplexer, and the wavelengths of the optical signals input to the optical multiplexer by the n optical sources are different from each other;
the optical multiplexer is used for multiplexing the optical signals input by the n light sources to obtain the multiplexed optical signals.
17. The optical transmission system according to claim 15 or 16,
the signal transmission device further includes: an amplifying module;
the amplifying module is configured to amplify a path of data signal before the modulator modulates the multiplexed optical signal, where the first optical signal and the second optical signal both carry the data signal.
18. A signal transmission method applied to a signal transmission apparatus, the signal transmission apparatus including a modulation multiplexing module and a transmission module, the method comprising:
the modulation multiplexing module modulates and multiplexes n optical signals with different wavelengths to obtain a target optical signal, wherein the target optical signal comprises a first optical signal and a second optical signal, the wavelength of the first optical signal is different from that of the second optical signal, the first optical signal and the second optical signal carry associated data signals, and n is an integer greater than 1;
and the sending module sends the target optical signal to an optical link.
19. The method of claim 18,
the associated data signal is generated by a data signal.
20. The method of claim 18 or 19,
the associated data signals are the same data signal; or,
the associated data signal conjugate; or,
the associated data signal is a differential signal.
21. The method according to any one of claims 18 to 20,
the modulation multiplexing module includes: a modulation unit and an optical multiplexer;
the modulation multiplexing module modulates and multiplexes n optical signals with different wavelengths to obtain a target optical signal, and the modulation multiplexing module comprises:
the modulation unit modulates the n optical signals with different wavelengths to obtain n modulated optical signals with different wavelengths;
and the optical multiplexer multiplexes the modulated n optical signals with different wavelengths to obtain the target optical signal.
22. The method of claim 21,
the modulation unit comprises n light sources, and the wavelengths of optical signals emitted by the n light sources are different;
the modulation unit modulates the n optical signals with different wavelengths to obtain n modulated optical signals with different wavelengths, and the method includes: and the n light sources modulate the n optical signals with different wavelengths in a one-to-one correspondence manner to obtain the modulated n optical signals with different wavelengths.
23. The method of claim 21,
the modulation unit comprises n light sources and n modulators, and the n light sources correspond to the n modulators one by one;
the modulation unit modulates the n optical signals with different wavelengths to obtain n modulated optical signals with different wavelengths, and the method includes:
each light source in the n light sources inputs an optical signal with one wavelength to the corresponding modulator, and the wavelengths of the optical signals input to the n modulators by the n light sources are different;
and the n modulators modulate the optical signals input by the n light sources in a one-to-one correspondence manner to obtain the modulated optical signals with n different wavelengths.
24. The method of any one of claims 18 to 23,
the signal transmitting device further comprises a splitter;
before the modulation multiplexing module modulates and multiplexes the optical signals of n different wavelengths, the method further includes: the splitter divides one path of data signal into n paths of data signals;
the target optical signal includes n optical signals with different wavelengths, and the n optical signals with different wavelengths carry the n data signals in a one-to-one correspondence.
25. The method of claim 24,
the signal sending device also comprises m delayers, m is more than or equal to 1 and less than or equal to n, and m is an integer;
before the modulation multiplexing module modulates and multiplexes the optical signals of n different wavelengths, the method further includes: and the m delayers respectively delay m paths of data signals in the n paths of data signals.
26. The method of claim 24 or 25,
the signal transmitting device also comprises an amplifying module;
before the modulation multiplexing module modulates and multiplexes the optical signals of n different wavelengths, the method further includes: and the amplifying module amplifies the n paths of data signals.
27. A signal receiving method, applied to a signal receiving apparatus, wherein the signal receiving apparatus includes a receiving module and a photoelectric conversion module, and the method includes:
the receiving module receives a target optical signal through an optical link, wherein the target optical signal comprises n optical signals with different wavelengths, the n optical signals with different wavelengths comprise a first optical signal and a second optical signal, the first optical signal and the second optical signal carry associated data signals, and n is an integer greater than 1;
the photoelectric conversion module performs photoelectric conversion on the target optical signal to obtain a target electric signal, wherein the target electric signal comprises the associated data signal.
28. The method of claim 27,
the associated data signal is generated by a route data signal.
29. The method of claim 27 or 28,
the associated data signals are the same data signal; or,
the associated data signal conjugate; or,
the associated data signal is a differential signal.
30. The method of any one of claims 27 to 29,
the signal receiving device also comprises a processing module;
after the photoelectric conversion module performs photoelectric conversion on the target optical signal to obtain a target electrical signal, the method further includes: and the processing module is used for carrying out digital signal processing on the target electric signal.
31. A chip comprising programmable logic circuitry and/or program instructions which when run implement the method of any of claims 18 to 26 or the method of any of claims 27 to 30.
CN202011540316.1A 2020-12-23 2020-12-23 Signal transmitting apparatus, signal receiving method, and optical transmission system Pending CN114665969A (en)

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US7072592B2 (en) * 2001-05-25 2006-07-04 Lucent Technologies Inc. Differential dense wavelength division multiplexing (DDWDM) in optical systems
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WO2005050884A1 (en) * 2003-11-20 2005-06-02 Nippon Telegraph And Telephone Corporation Wavelength multiplex transmission system
AU2009201717A1 (en) * 2008-05-12 2009-12-10 Edith Cowan University A module for transforming between a RF signal and a digital multiplexed optical signal
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