CN116366161A - Optical fiber ring network radio frequency signal stable transmission system - Google Patents

Optical fiber ring network radio frequency signal stable transmission system Download PDF

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Publication number
CN116366161A
CN116366161A CN202310077904.3A CN202310077904A CN116366161A CN 116366161 A CN116366161 A CN 116366161A CN 202310077904 A CN202310077904 A CN 202310077904A CN 116366161 A CN116366161 A CN 116366161A
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signal
radio frequency
optical
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optical fiber
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CN116366161B (en
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刘晨霞
王晗悦
李烁
喻松
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North China Electric Power University
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North China Electric Power University
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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
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
    • H04B10/25752—Optical arrangements for wireless networks
    • H04B10/25753—Distribution optical network, e.g. between a base station and a plurality of remote units
    • H04B10/25755—Ring network topology
    • 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
    • H04B10/503—Laser transmitters
    • H04B10/505—Laser transmitters using external modulation
    • H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
    • H04B10/50577—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output to control the phase of the modulating signal
    • 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
    • H04B10/61—Coherent receivers
    • H04B10/616—Details of the electronic signal processing in coherent optical receivers
    • H04B10/6165—Estimation of the phase of the received optical signal, phase error estimation or phase error correction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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

Abstract

The application provides an optical fiber ring network radio frequency signal stable transmission system, which utilizes a first far-end device to generate an initial signal, receives a mixing filtering signal generated by a local end device according to the initial signal, carries out filtering phase locking on the mixing filtering signal, carries out frequency multiplication processing on a target first radio frequency signal, and obtains a radio frequency signal with the same frequency and phase as a reference signal. And the second far-end equipment receives the mixing filtering signal sent by the local end equipment and the other path of first radio frequency signal sent by the first far-end equipment, performs filtering phase locking on the other path of first radio frequency signal, performs filtering processing on the mixing filtering signal to obtain a processed signal, performs mixing processing on the target second radio frequency signal and the processed signal to obtain a radio frequency signal with the same frequency and phase as the reference signal, and can effectively ensure the signal-to-noise ratio while completing continuous transmission of the radio frequency signal so as to realize stable transmission of the radio frequency signal in the long-distance optical fiber network.

Description

Optical fiber ring network radio frequency signal stable transmission system
Technical Field
The application relates to the technical field of signal transmission, in particular to an optical fiber ring network radio frequency signal stable transmission system.
Background
In a conventional optical fiber transmission network, radio frequency signals received by each remote device come from a local receiving station, and when the transmission distance of the optical fiber is lengthened, the signal-to-noise ratio of the radio frequency signals received by each remote device is seriously deteriorated. This problem is particularly pronounced in long-haul optical fiber transmission, where the signal-to-noise ratio is severely degraded as the number of remote devices increases, and the stability of the rf signal transmission is significantly reduced.
Disclosure of Invention
In view of the above, the present application is directed to an optical fiber ring network rf signal stable transmission system for solving or partially solving the above technical problems.
Based on the above purpose, the present application provides an optical fiber ring network radio frequency signal stable transmission system, including: a local end device and a plurality of remote end devices connected by fiber optic links, the plurality of remote end devices including a first remote end device and a second remote end device,
the local terminal equipment is configured to receive an initial signal sent by the first remote terminal equipment, perform frequency mixing filtering on the initial signal and a reference signal generated by the local terminal equipment to obtain a frequency mixing filtering signal, and send the frequency mixing filtering signal to the first remote terminal equipment and the second remote terminal equipment respectively;
The first remote device is configured to generate an initial signal, send the initial signal to the local device, receive a mixing filtering signal sent by the local device, perform filtering phase locking on the mixing filtering signal to obtain two paths of first radio frequency signals, perform frequency multiplication processing on a target first radio frequency signal to obtain a radio frequency signal with the same frequency and phase as the reference signal, and send another path of first radio frequency signal except the target first radio frequency signal to the second remote device, wherein the target first radio frequency signal is any one path of first radio frequency signal of the two paths of first radio frequency signals;
the second remote device is configured to receive the mixing filtering signal sent by the local device and the other path of first radio frequency signal sent by the first remote device, filter and lock the other path of first radio frequency signal to obtain two paths of second radio frequency signals, filter the mixing filtering signal to obtain a processed signal, and mix the target second radio frequency signal and the processed signal to obtain radio frequency signals with the same frequency and phase as those of the reference signal, wherein the target second radio frequency signal is any one path of second radio frequency signal of the two paths of second radio frequency signals.
From the above, it can be seen that the optical fiber ring network radio frequency signal stable transmission system provided by the application uses the first far-end device to generate an initial signal, sends the initial signal to the local end device, receives the mixing filtering signal generated by the local end device according to the initial signal, performs filtering phase locking on the mixing filtering signal to obtain two paths of first radio frequency signals, and performs frequency multiplication processing on the target first radio frequency signals to obtain radio frequency signals with the same frequency and phase as those of the reference signal. The second remote equipment receives the mixing filtering signal sent by the local equipment and the other path of first radio frequency signal sent by the first remote equipment, performs filtering phase locking on the other path of first radio frequency signal to obtain two paths of second radio frequency signals, performs filtering processing on the mixing filtering signal to obtain a processed signal, and performs mixing processing on the target second radio frequency signal and the processed signal to obtain radio frequency signals with the same frequency and phase as those of the reference signal. And when the radio frequency signal continuous transmission is finished, the signal to noise ratio is effectively ensured so as to realize the stable transmission of the radio frequency signal in the long-distance optical fiber network.
Drawings
In order to more clearly illustrate the technical solutions of the present application or related art, the drawings that are required to be used in the description of the embodiments or related art will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort to those of ordinary skill in the art.
Fig. 1 is a schematic structural diagram of an optical fiber ring network radio frequency signal stable transmission system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a local end device according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a remote device according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an optical fiber ring network radio frequency signal stable transmission system according to another embodiment of the present application;
in the figure:
1. a local end device; 1-1, an optical circulator system; 1-11, a first optical circulator; 1-12, a second optical circulator; 1-2, an optical bandpass filter system; 1-21, a first optical bandpass filter; 1-22, a second optical bandpass filter; 1-3, a photodetector system; 1-31, a first photodetector; 1-32, a second photodetector; 1-4, a signal source; 1-5 mixer systems; 1-51, a first mixer; 1-52, a second mixer; 1-6, a bandpass filter system; 1-61, a first band-pass filter; 1-62, a second band-pass filter; 1-7, a laser diode system; 1-71, a first laser diode; 1-72, a second laser diode; a 1-8 Mach-Zehnder modulator system; 1-81, a first Mach-Zehnder modulator; 1-82, a second mach-zehnder modulator;
2. An optical fiber link;
3. a first remote device; 3-1, a first phase-locked loop; 3-2, a third laser diode; 3-3, a third Mach-Zehnder modulator; 3-4, a first optical fiber isolator; 3-5, a first optical fiber coupler; 3-6, a third optical band-pass filter; 3-7, a third photoelectric detector; 3-8, a first frequency multiplier;
4. a second remote device; 4-1, a first child remote device; 4-11, a second optical fiber coupler; 4-12, a third optical circulator; 4-13, fifth optical band-pass filter; 4-14, a fifth photoelectric detector; 4-15, a fourth optical band-pass filter; 4-16, a fourth photodetector; 4-17, a second phase-locked loop; 4-18, a third mixer; 4-19, a fourth laser diode; 4-110, a fourth Mach-Zehnder modulator; 4-111, a second fiber isolator; 4-2, a second sub-remote device; 4-21, a third fiber coupler; 4-22, a fourth optical circulator; 4-23, a seventh optical bandpass filter; 4-24, a seventh photoelectric detector; 4-25, a third phase-locked loop; 4-26, sixth optical bandpass filter; 4-27, a sixth photodetector; 4-28, a fourth mixer; 4-29, a fifth laser diode; 4-210, fifth Mach-Zehnder modulators; 4-211, a third optical fiber isolator; 4-3, other first sub-remote devices; 4-4, other second child remote devices.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings.
It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present application should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "first," "second," and the like, as used in embodiments of the present application, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
In a conventional optical fiber transmission network in the related art, radio frequency signals received by each remote device come from a local receiving station, and when the transmission distance of the optical fiber is prolonged, the signal-to-noise ratio of the radio frequency signals received by each remote device is seriously deteriorated. This problem is particularly pronounced in long-haul optical fiber transmission, where the signal-to-noise ratio is severely degraded as the number of remote devices increases, and the stability of the rf signal transmission is significantly reduced.
Based on the above description, the embodiments of the present application provide an optical fiber ring network radio frequency signal stable transmission system.
As shown in fig. 1, the stable transmission system of the optical fiber ring network radio frequency signal comprises: a local end device 1 and a plurality of remote devices connected by a fiber optic link 2, the plurality of remote devices comprising a first remote device 3 and a second remote device 4,
the local end device 1 is configured to receive an initial signal sent by the first remote end device 3, perform mixing filtering on the initial signal and a reference signal generated by the local end device 1 to obtain a mixing filtering signal, and send the mixing filtering signal to the first remote end device 3 and the second remote end device 4 respectively;
the first remote device 3 is configured to generate an initial signal, send the initial signal to the local device 1, receive a mixing filtering signal sent by the local device 1, perform filtering phase locking on the mixing signal to obtain two paths of first radio frequency signals, perform frequency multiplication processing on a target first radio frequency signal to obtain radio frequency signals with the same frequency and phase as the reference signal, and send another path of first radio frequency signals except for the target first radio frequency signal to the second remote device 4, where the target first radio frequency signal is any one path of first radio frequency signals of the two paths of first radio frequency signals;
The second remote device 4 is configured to receive the mixed filtering signal sent by the local device 1 and the other path of first radio frequency signal sent by the first remote device 3, filter and lock the other path of first radio frequency signal to obtain two paths of second radio frequency signals, filter the mixed filtering signal to obtain a processed signal, and mix the target second radio frequency signal and the processed signal to obtain a radio frequency signal with the same frequency and phase as those of the reference signal, where the target second radio frequency signal is any one path of second radio frequency signal of the two paths of second radio frequency signals.
In particular, the first remote device 3 represents a device that needs to be configured when a user first appears in the optical fiber ring network, and the second remote device 4 represents a remote device that is connected adjacent to the first remote device 3.
The first remote device 3 is utilized to generate an initial signal, the initial signal is sent to the local device 1, the mixed filtering signal sent by the local device 1 according to the initial signal is received, filtering phase locking is carried out on the mixed filtering signal, so that the first remote device 3 can generate radio frequency signals with the same frequency and phase as those of the reference signal of the local device 1, then the other path of first radio frequency signals are continuously transmitted to the second remote device 4 adjacent to the first remote device 3, the second remote device 4 can also generate radio frequency signals with the same frequency and phase as those of the reference signal of the local device 1 according to the mixed filtering signal sent by the local device 1 and the other path of first radio frequency signals sent by the first remote device 3, and further, signal to noise ratio is effectively ensured while signal transmission is completed, and stable transmission of radio frequency signals in a long-distance optical fiber network is realized. The stable radio frequency signal transmission of the long-distance optical fiber ring network multi-remote device can be realized, and the coverage range of the radio frequency signal is wider than that of the traditional optical fiber transmission network.
In some embodiments, the second remote device 4 comprises at least one first sub-remote device 4-1 and/or at least one second sub-remote device 4-2, the mixed filtered signal comprising a first sub-mixed filtered signal and/or a second sub-mixed filtered signal;
the first sub-remote device 4-1 is configured to receive a first sub-mixing filtered signal sent by the local end device 1 and the other path of first radio frequency signal sent by the first remote device 3, filter and lock the other path of radio frequency signal to obtain two paths of third radio frequency signals, filter the first sub-mixing filtered signal to obtain a first sub-processed signal, and mix a target third radio frequency signal and the first sub-processed signal to obtain a radio frequency signal with the same frequency and phase as the reference signal, where the target third radio frequency signal is any one of the two paths of third radio frequency signals, and the first sub-mixing filtered signal is a signal sent by the local end device 1 in a clockwise direction;
the second sub-remote device 4-2 is configured to receive the second sub-mixing filtered signal sent by the local end device 1 and the other path of first radio frequency signal sent by the first remote device 3, filter and lock the other path of first radio frequency signal to obtain two paths of fourth radio frequency signals, filter the second sub-mixing filtered signal to obtain a second sub-processed signal, and mix the target fourth radio frequency signal and the second sub-processed signal to obtain a radio frequency signal with the same frequency and phase as the reference signal, where the target fourth radio frequency signal is any one path of fourth radio frequency signal of the two paths of fourth radio frequency signals, and the second sub-mixing filter is a signal sent by the local end device 1 along the anticlockwise direction.
In particular, the first sub-remote device 4-1 is a remote device that is connected adjacent to the local device 1, and receives a signal sent by the local device 1 in a clockwise direction. The second sub-remote device 4-2 is a remote device that is connected adjacent to the local end device 1 and receives a signal transmitted in the counterclockwise direction by the local end device 1. The first sub-remote device 4-1 receives the first sub-mixing filtering signal sent by the local terminal device 1 and another path of first radio frequency signal sent by the first remote device 3, performs filtering phase locking on the other path of first radio frequency signal to obtain two paths of third radio frequency signals, performs filtering processing on the first sub-mixing filtering signal to obtain a first sub-processed signal, and performs mixing processing on the target third radio frequency signal and the first sub-processed signal to obtain a radio frequency signal with the same frequency and phase as those of the reference signal. The signal-to-noise ratio of the signal is effectively ensured while the signal continuing transmission is completed, so that the stable transmission of the radio frequency signal in the long-distance optical fiber network is realized.
The second sub-remote device 4-2 receives the second sub-mixing filtering signal sent by the local terminal device 1 and another path of first radio frequency signal sent by the first remote device 3, performs filtering phase locking on the other path of first radio frequency signal to obtain two paths of fourth radio frequency signals, performs filtering processing on the second sub-mixing filtering signal to obtain a second sub-processed signal, and performs mixing processing on the target fourth radio frequency signal and the second sub-processed signal to obtain radio frequency signals with the same frequency and phase as those of the reference signal. The signal-to-noise ratio of the signal is effectively ensured while the signal continuing transmission is completed, so that the stable transmission of the radio frequency signal in the long-distance optical fiber network is realized.
In some embodiments, the local side device 1 comprises: an optical circulator system 1-1, an optical band-pass filter system 1-2, a photodetector system 1-3, a signal source 1-4, a mixer system 1-5, a band-pass filter system 1-6, a laser diode system 1-7 and a Mach-Zehnder modulator system 1-8,
the optical interface of the optical circulator system 1-1 is connected with an optical fiber link 2, the output end of the optical circulator system 1-1 is connected with the input end of the optical band pass filter system 1-2, the output end of the optical band pass filter system 1-2 is connected with the input end of the photoelectric detector system 1-3, the output end of the signal source 1-4 is connected with the input end of the mixer system 1-5, the output end of the mixer system 1-5 is connected with the input end of the band pass filter system 1-6, the output end of the band pass filter system 1-6 is connected with the input end of the Mach-Zehnder modulator system 1-8, the output end of the laser diode system 1-7 is connected with the input end of the Mach-Zehnder modulator system 1-8, and the output end of the Mach-Zehnder modulator system 1-8 is connected with the input end of the optical circulator system 1-1;
the optical circulator system 1-1 is configured to receive an initial signal transmitted through the optical fiber link 2 and to send the initial signal to the optical band-pass filter system 1-2;
The optical band-pass filtering system 1-2 is configured to receive an initial signal sent by the optical circulator system 1-1, perform filtering processing on the initial signal to obtain a filtered signal, and send the filtered signal to the photodetector system 1-3;
the photodetector system 1-3 is configured to receive the filtered signal transmitted by the optical bandpass filter system 1-2, convert the filtered signal from an optical signal to an electrical signal, and transmit the filtered signal converted to an electrical signal to the mixer system 1-5;
the signal source 1-4 is configured to provide a reference signal for the mixer-system 1-5;
the mixer-system 1-5 is configured to receive the reference signal and the filtered signal converted into an electrical signal transmitted by the photodetector-system 1-3, mix the reference signal and the filtered signal converted into an electrical signal to obtain a mixed signal, and transmit the mixed signal to the band-pass filter-system 1-6;
the band-pass filter system 1-6 is configured to receive the mixed signal sent by the mixer system 1-5, filter the mixed signal to obtain a mixed filter signal, and send the mixed filter signal to the Mach-Zehnder modulator system 1-8;
The laser diode system 1-7 is configured to send a modulation signal to the Mach-Zehnder modulator system 1-8 to control the Mach-Zehnder modulator system 1-8 to adjust the mixing filtering signal to obtain a preset wavelength optical signal;
the mach-zehnder modulator system 1-8 is configured to receive the mixed filtered signal transmitted by the band-pass filter system 1-6 and the modulated signal transmitted by the laser diode system 1-7, adjust the mixed filtered signal to the same wavelength as the preset wavelength optical signal according to the modulated signal, obtain an adjusted mixed filtered signal, and transmit the adjusted mixed filtered signal to the optical circulator system 1-1 for the optical circulator system 1-1 to transmit the adjusted mixed filtered signal to the first remote device 3 and the second remote device 4 through the optical fiber link 2.
In specific implementation, as shown in fig. 2, the local end device 1 performs filtering processing on an initial signal sent by the first far end device 3 by using the optical band pass filter system 1-2 to obtain a filtered signal, then uses the photoelectric detector system 1-3 to convert the filtered signal from an optical signal to an electrical signal, mixes a reference signal generated by the signal source 1-4 in the local end device 1 and the filtered signal converted to the electrical signal by the mixer system 1-5 to obtain a mixed signal, filters the mixed signal by the band pass filter system 1-6 to obtain a mixed filtered signal, adjusts the mixed filtered signal to the same wavelength as a preset wavelength optical signal based on a modulation signal sent by the mach-zehnder modulator system 1-8 according to the laser diode system 1-7 to obtain an adjusted mixed filtered signal, and transmits the adjusted mixed filtered signal to the first far end device 3 and the second far end device 4 through the optical fiber link 2.
In some embodiments, the optical circulator system 1-1 includes a first optical circulator 1-11, the optical band pass filter system 1-2 includes a first optical band pass filter 1-21, the photodetector system 1-3 includes a first photodetector 1-31, the mixer system 1-5 includes a first mixer 1-51, the band pass filter system 1-6 includes a first band pass filter 1-61, the laser diode system 1-7 includes a first laser diode 1-71, the Mach-Zehnder modulator system 1-8 includes a first Mach-Zehnder modulator 1-81,
the optical interface of the first optical circulator 1-11 is connected with an optical fiber link 2, the output end of the first optical circulator 1-11 is connected with the input end of a first optical band-pass filter 1-21, the output end of the first optical band-pass filter 1-21 is connected with the input end of a first photoelectric detector 1-31, the output end of the signal source 1-4 is connected with the input end of a first mixer 1-51, the output end of the first photoelectric detector 1-31 is connected with the input end of the first mixer 1-51, the output end of the first mixer 1-51 is connected with the input end of a first band-pass filter 1-61, the output end of the first band-pass filter 1-61 is connected with the input end of a first Mach-Zehnder modulator 1-81, the output end of the first laser diode 1-71 is connected with the input end of the first Mach-Zehnder modulator 1-81, and the output end of the first Mach-Zehnder modulator 1-81 is connected with the input end of the first optical circulator 1-11;
The first optical circulator 1-11 is configured to receive an initial signal transmitted in a counter-clockwise direction through the optical fiber link 2 and to send the initial signal to the first optical band-pass filter 1-21;
the first optical bandpass filter 1-21 is configured to receive an initial signal sent by the first optical circulator 1-11, perform filtering processing on the initial signal to obtain a first filtered signal, and send the first filtered signal to the first photodetector 1-31;
the first photodetector 1-31 is configured to receive the first filtered signal transmitted by the first optical bandpass filter 1-21, convert the first filtered signal from an optical signal to an electrical signal, and transmit the first filtered signal converted to the electrical signal to the first mixer 1-51;
the first mixer 1-51 is configured to receive the reference signal and the first filtered signal converted into an electrical signal transmitted by the first photodetector 1-31, mix the reference signal and the first filtered signal converted into an electrical signal to obtain a first mixed signal, and transmit the first mixed signal to the first band-pass filter 1-61;
The first band-pass filter 1-61 is configured to receive the first mixed signal sent by the first mixer 1-51, filter the first mixed signal to obtain a first sub-mixed filtered signal, and send the first sub-mixed filtered signal to the first mach-zehnder modulator 1-81;
the first laser diode 1-71 is configured to send a first modulation signal to the first mach-zehnder modulator 1-81 to control the first mach-zehnder modulator 1-81 to adjust the first sub-mixing filter signal to obtain a preset wavelength optical signal;
the first mach-zehnder modulator 1-81 is configured to receive the first sub-mixing filtered signal sent by the first band-pass filter 1-61 and the first modulated signal sent by the first laser diode 1-71, adjust the first sub-mixing filtered signal to the same wavelength as the preset wavelength optical signal according to the first modulated signal, obtain an adjusted first sub-mixing filtered signal, and send the adjusted first sub-mixing filtered signal to the first optical circulator, so that the first optical circulator 1-11 transmits the adjusted first sub-mixing filtered signal to the first remote device 3 and the first sub-remote device 4-1 in a clockwise direction through the optical fiber link.
In practice, as shown in FIG. 2, the first remote device 3 generates a frequency ω through an oscillator in the first phase locked loop 3-1 s The phase is
Figure BDA0004066591600000091
The frequency value of the signal (i.e., the initial signal) is approximately 1/2 of the frequency of the local reference signal, and because the present application focuses on delay and phase jitter, the signal amplitude term is ignored in the following signal expression, and thus the expression is written as:
Figure BDA0004066591600000092
this signal is modulated onto an optical signal with a wavelength x by a third mach-zehnder modulator 3-3 controlled by a third laser diode 3-2, and in order to prevent the reflection from generating reverse light and affecting the spectral purity, a first optical fiber isolator 3-4 is added after the third mach-zehnder modulator 3-3, so as to ensure that the optical signal can be transmitted unidirectionally along the optical fiber link without reflection back-off. After passing through the first fiber isolator 3-4, the optical signal enters the entire fiber link 2 through two ports on opposite sides of the 2 x 2 first fiber coupler 3-5.
Wavelength lambda 0 Is output from the first remote device 3 and is transmitted via the optical fiber link 2 in a counter-clockwise direction to the local device 1, the first optical circulator 1-11 of which receives the signal transmitted in the counter-clockwise direction, and the out-of-band light is filtered by the first optical band-pass filter 1-21, allowing only the wavelength lambda 0 After passing through, the optical signal is sent to the first photo-detector 1-31, and the conversion from the optical signal to the electric signal is completed. Because the optical fiber is affected by external environmental changes, such as temperature vibration, when signals are transmitted in the optical fiber link, delay jitter is introduced to the signals transmitted by the optical fiber.
The signal transmitted in the anticlockwise direction is obtained after passing through the first photodetectors 1 to 31:
Figure BDA0004066591600000093
wherein Deltaτ 1 Is a delay jitter superimposed on the signal as it is transmitted by the first remote device 3 in a counter-clockwise direction via the optical fiber link 2 to the local device 1.
Next, signal E 1 Reference signal E with local side device 1 m Mixing, where E m The expression is:
Figure BDA0004066591600000094
the mixed signal expression is:
Figure BDA0004066591600000101
E 3 the out-of-band signal is filtered out by the first band pass filter 1-61, leaving only the required difference frequency signal, which is expressed as:
Figure BDA0004066591600000102
finally E is passed through the first Mach-Zehnder modulator 1-81 4 Loaded to a wavelength lambda a Is returned to the optical fiber link 2 through the first optical circulator 1-11. The port on the local device 1 will output a wavelength lambda a Has a wavelength lambda a In a clockwise direction through the optical fiber link 2 to the far end.
In some embodiments, the optical circulator system 1-1 includes a second optical circulator 1-12, the optical bandpass filter system 1-2 includes a second optical bandpass filter 1-22, the photodetector system 1-3 includes a second photodetector 1-32, the mixer system 1-5 includes a second mixer 1-52, the bandpass filter system 1-6 includes a second bandpass filter 1-62, the laser diode system 1-7 includes a second laser diode 1-72, the Mach-Zehnder modulator system 1-8 includes a second Mach-Zehnder modulator 1-82,
The optical interface of the second optical circulator 1-12 is connected with the optical fiber link 2, the output end of the second optical circulator 1-12 is connected with the input end of the second optical band-pass filter 1-22, the output end of the second optical band-pass filter 1-22 is connected with the input end of the second photoelectric detector 1-32, the output end of the signal source 1-4 is connected with the input end of the second mixer 1-52, the output end of the second photoelectric detector 1-32 is connected with the input end of the second mixer 1-52, the output end of the second mixer 1-52 is connected with the input end of the second band-pass filter 1-62, the output end of the second band-pass filter 1-62 is connected with the input end of the second Mach-Zehnder modulator 1-82, the output end of the second laser diode 1-72 is connected with the input end of the second Mach-Zehnder modulator 1-82, and the output end of the second Mach-Zehnder modulator 1-82 is connected with the input end of the second optical circulator 1-12;
the second optical circulator 1-12 is configured to receive an initial signal transmitted in a clockwise direction through the optical fiber link 2 and to send the initial signal to the second optical band-pass filter 1-22;
the second optical bandpass filter 1-22 is configured to receive an initial signal sent by the second optical circulator 1-12, perform filtering processing on the initial signal to obtain a second filtered signal, and send the second filtered signal to the second photodetector 1-32;
The second photodetector 1-32 is configured to receive the second filtered signal sent by the second optical bandpass filter 1-22, convert the second filtered signal from an optical signal to an electrical signal, and send the second filtered signal converted to an electrical signal to the second mixer 1-52;
the second mixer 1-52 is configured to receive the reference signal and the second filtered signal converted into an electrical signal transmitted by the second photodetector 1-32, mix the reference signal and the second filtered signal converted into an electrical signal to obtain a second mixed signal, and transmit the second mixed signal to the second bandpass filter 1-62;
the second band-pass filter 1-62 is configured to receive the second mixed signal sent by the second mixer 1-52, filter the second mixed signal to obtain a second sub-mixed filtered signal, and send the second sub-mixed filtered signal to the second mach-zehnder modulator 1-82;
the second laser diode 1-72 is configured to send a second modulation signal to the second mach-zehnder modulator 1-82 to control the second mach-zehnder modulator 1-82 to adjust the second sub-mixing filter signal to obtain a preset wavelength optical signal;
The second mach-zehnder modulator 1-82 is configured to receive the second sub-mixing filtered signal sent by the second band-pass filter 1-62 and the second modulated signal sent by the second laser diode 1-72, adjust the second sub-mixing filtered signal to the same wavelength as the preset wavelength optical signal according to the second modulated signal, obtain an adjusted second sub-mixing filtered signal, and send the adjusted second sub-mixing filtered signal to the second optical circulator 1-12, so that the second optical circulator 1-12 transmits the adjusted second sub-mixing filtered signal to the first remote device 3 and the second sub-remote device 4-2 along the counterclockwise direction through the optical fiber link.
In practice, as shown in FIG. 2, the first remote device 3 generates a frequency ω through an oscillator in the first phase locked loop 3-1 s The phase is
Figure BDA0004066591600000111
The frequency value of the signal (i.e., the initial signal) is approximately 1/2 of the frequency of the local reference signal, and because the present application focuses on delay and phase jitter, the signal amplitude term is ignored in the following signal expression, and thus the expression is written as:
Figure BDA0004066591600000112
this signal is modulated to a wavelength lambda by a third Mach-Zehnder modulator 3-3, which controls the input of a third laser diode 3-2 0 To prevent the reflection from generating reverse light and affecting the spectral purity, a first optical fiber isolator 3-4 is added after the third mach-zehnder modulator 3-3, so as to ensure that the optical signal can be transmitted unidirectionally along the optical fiber link without reflection back-off. After passing through the first fiber isolator 3-4, the optical signal enters the entire fiber link 2 through two ports on opposite sides of the 2 x 2 first fiber coupler 3-5.
Wavelength lambda 0 Is output from the first remote device 3 and is transmitted via the optical fiber link 2 in a clockwise direction to the local device 1, the second optical circulator 1-12 of the local device receives the signal transmitted in the clockwise direction and filters out-of-band light via the second optical band-pass filter 1-22, allowing only the wavelength lambda 0 After passing through, the optical signal is sent to the second photo detector 1-32, and the conversion from the optical signal to the electric signal is completed. Because the optical fiber is affected by external environmental changes, such as temperature vibration, when signals are transmitted in the optical fiber link, delay jitter is introduced to the signals transmitted by the optical fiber.
The signals transmitted in the clockwise direction are obtained after passing through the second photoelectric detectors 1-32:
Figure BDA0004066591600000121
wherein Deltaτ 2 Is the superimposed delay jitter when the signal is transmitted by the first far-end device 3 in a clockwise direction via the optical fiber link 2 to the local end device 1.
Next, signal E 2 Also through and E m Mixing and filtering, and loading the generated difference frequency signal to the wavelength lambda b The signal expression is:
Figure BDA0004066591600000122
through the firstThe two optical circulators 1-12 return into the optical fiber link 2. The lower port of the local device 1 outputs a wavelength lambda b Has a wavelength lambda b In a counter-clockwise direction through the optical fiber link 2 to the far end.
In some embodiments, the first remote device 3 comprises: a first phase-locked loop 3-1, a third laser diode 3-2, a third Mach-Zehnder modulator 3-3, a first fiber isolator 3-4, a first fiber coupler 3-5, a third optical band-pass filter 3-6, a third photodetector 3-7 and a first frequency multiplier 3-8,
the output end of the first phase-locked loop 3-1 is respectively connected with the input end of the third Mach-Zehnder modulator 3-3 and the input end of the first frequency multiplier 3-8, the output end of the third laser diode 3-2 is connected with the input end of the third Mach-Zehnder modulator 3-3, the output end of the third Mach-Zehnder modulator 3-3 is connected with the input end of the first optical fiber isolator 3-4, the output end of the first optical fiber isolator 3-4 is connected with the input end of the first optical fiber coupler 3-5, the optical interface of the first optical fiber coupler 3-5 is connected with the optical fiber link 2, the output end of the first optical fiber coupler 3-5 is connected with the input end of the third optical band pass filter 3-6, the output end of the third optical band pass filter 3-6 is connected with the input end of the third photoelectric detector 3-7, and the output end of the third photoelectric detector 3-7 is connected with the input end of the first phase-locked loop 3-1;
The first phase locked loop 3-1 is configured to generate an electrical signal for controlling the third mach-zehnder modulator 3-3;
the third laser diode is configured by 3-2 to send a third modulated signal to the third mach-zehnder modulator 3-3;
the third mach-zehnder modulator 3-3 is configured to receive the electrical signal sent by the first phase-locked loop 3-1 and a third modulation signal sent by the third laser diode 3-2, adjust the electrical signal sent by the first phase-locked loop 3-1 according to the third modulation signal to obtain an initial signal with a preset wavelength, send the initial signal to the first optical fiber isolator 3-4, receive another path of first radio frequency signal sent by the first phase-locked loop 3-1, and send the other path of first radio frequency signal to the first optical fiber isolator 3-4;
the first optical fiber isolator 3-4 is configured to send the initial signal to the first optical fiber coupler 3-5, receive another path of first radio frequency signal sent by the third mach-zehnder modulator 3-3, and send the other path of first radio frequency signal to the first optical fiber coupler 3-5;
the first optical fiber coupler 3-5 is configured to receive an initial signal sent by the first optical fiber isolator 3-4, send the initial signal to the local end device 1, receive a first sub-mixing filtered signal sent by the local end device 1, send the first sub-mixing filtered signal to the third optical band-pass filter 3-6, receive the other path of first radio frequency signal sent by the first optical fiber isolator 3-4, and send the other path of first radio frequency signal to the first sub-remote device 4-1 and/or the second sub-remote device 4-2;
The third optical band-pass filter 3-6 is configured to receive the first sub-mixing filtered signal sent by the first optical fiber coupler 3-5, filter the first sub-mixing filtered signal to obtain a filtered first sub-mixing filtered signal, and send the filtered first sub-mixing filtered signal to the third photodetector 3-7;
the third photodetector 3-7 is configured to receive the filtered first sub-mixing filtered signal sent by the third optical band-pass filter 3-6, send the filtered first sub-mixing filtered signal to the first phase-locked loop 3-1, so that the first phase-locked loop 3-1 performs phase discrimination processing on the filtered first sub-mixing filtered signal according to the initial signal to obtain two paths of first radio frequency signals, send the target first radio frequency signal to the first frequency multiplier 3-8, and send another path of first radio frequency signal except the target first radio frequency signal to the third mach-zehnder modulator 3-3;
the first frequency multiplier 3-8 is configured to receive the target first radio frequency signal sent by the first phase-locked loop 3-1, and perform frequency multiplication processing on the target first radio frequency signal to obtain a radio frequency signal with the same frequency and phase as the reference signal.
In practical implementation, as shown in fig. 3, the wavelength λ of the local end device 1 is a The optical signal reaching the first remote device 3 in a clockwise direction, after passing through the third optical bandpass filter 3-6 and the third photodetector 3-7, the expression should be:
Figure BDA0004066591600000141
wherein Deltaτ 3 Is the superimposed delay jitter when the signal is transmitted by the local end device 1 in a clockwise direction via the optical fiber link 2 to the first remote end device 3. However, since each unidirectional pass in the round-trip transmission passes through the same path and the external environment is the same, the delay jitter generated by the transmission over the optical fiber link 2 satisfies:
Δτ 1 ＝Δτ 3 (9)
E 6 enters a first phase-locked loop 3-1, and E 0 Phase discrimination such that angular frequency is locked to ω s Phase lock to
Figure BDA0004066591600000142
The method can obtain the following steps:
Figure BDA0004066591600000143
namely:
Figure BDA0004066591600000144
so E is 6 After passing through the first phase-locked loop 3-1, the output expression is:
Figure BDA0004066591600000145
signal E 7 Can be divided into two paths, one path is subjected to frequency doubling, and the frequency and the phase are doubled, so that the same-frequency and same-phase radiation with the local end equipment 1 can be obtained at the first remote end equipment 3Frequency signal E m The method comprises the steps of carrying out a first treatment on the surface of the Another path uses the third Mach-Zehnder modulator 3-3 to regenerate the phase-locked signal E 7 Modulating to optical signal with wavelength lambda 0, passing through optical fiber isolator and optical fiber coupler to obtain optical signal with wavelength lambda 0 Is introduced into the optical fiber link 2.
In some embodiments, the first child remote device 4-1 comprises: a second optical fiber coupler 4-11, a third optical circulator 4-12, a fifth optical band-pass filter 4-13, a fifth photodetector 4-14, a fourth optical band-pass filter 4-15, a fourth photodetector 4-16, a second phase-locked loop 4-17, a third mixer 4-18, a fourth laser diode 4-19, a fourth Mach-Zehnder modulator 4-110, a second optical fiber isolator 4-111,
the optical interface of the second optical fiber coupler 4-11 is connected with the optical fiber link 2, the output end of the second optical fiber coupler 4-11 is connected with the input end of the fourth optical band-pass filter 4-15 and the input end of the third optical circulator 4-12, the output end of the third optical circulator 4-12 is respectively connected with the input end of the second optical fiber coupler 4-11 and the input end of the fifth optical band-pass filter 4-13, the output end of the fifth optical band-pass filter 4-13 is connected with the input end of the fifth optical detector 4-14, the output end of the fifth optical detector 4-14 is connected with the input end of the third optical mixer 4-18, the output end of the fourth optical band-pass filter 4-15 is connected with the input end of the fourth optical detector 4-16, the output end of the fourth optical band-pass filter 4-16 is connected with the input end of the second phase-locked loop 4-17, the output end of the second optical band-pass filter 4-17 is respectively connected with the input end of the fourth Mach-110 and the input end of the third optical mixer 4-18, the output end of the fourth optical band-pass filter 4-19 is connected with the output end of the fourth optical isolator 4-12, and the fourth optical isolator 4-14 is connected with the input end of the fourth optical isolator 4-110;
The second optical fiber coupler 4-11 is configured to receive a first sub-mixing filtering signal sent by the local end device 1 and another first radio frequency signal sent by the first remote end device 3, send the first sub-mixing filtering signal to the third optical circulator 4-12, and send the other first radio frequency signal to the fourth optical band-pass filter 4-15;
the third optical circulator 4-12 is configured to receive the first sub-mixed filtered signal transmitted by the second optical fiber coupler 4-11 and transmit the first sub-mixed filtered signal to the fifth optical bandpass filter 4-13;
the fifth optical bandpass filter 4-13 is configured to receive the first sub-mixing filtered signal sent by the third optical circulator 4-12, filter the first sub-mixing filtered signal to obtain a first sub-processed signal, and send the first sub-processed signal to the fifth photodetector 4-14;
the fifth photodetector 4-14 is configured to receive the first sub-processed signal transmitted by the fifth optical bandpass filter 4-13 and transmit the first sub-processed signal to the third mixer 4-18;
the fourth optical band-pass filter 4-15 is configured to receive another first radio frequency signal sent by the second optical fiber coupler 4-11, filter the another first radio frequency signal to obtain a filtered another first radio frequency signal, and send the filtered another first radio frequency signal to the fourth photodetector 4-16;
The fourth photodetector 4-16 is configured to receive the filtered further first radio frequency signal sent by the fourth optical bandpass filter 4-15 and send the filtered further first radio frequency signal to the second phase locked loop 4-17;
the second phase-locked loop 4-17 is configured to receive the filtered another first radio frequency signal sent by the fourth photodetector 4-16, perform phase-locked regeneration on the filtered another first radio frequency signal to obtain two third radio frequency signals, send a target third radio frequency signal to the third mixer 4-18, and send another third radio frequency signal except the target third radio frequency signal to the fourth mach-zehnder modulator 4-110;
the third mixer 4-18 is configured to receive the target third radio frequency signal sent by the second phase-locked loop 4-17 and the first sub-processed signal sent by the fifth photo-detector 4-14, and perform mixing processing on the target third radio frequency signal and the first sub-processed signal to obtain a radio frequency signal with the same frequency and phase as the reference signal;
the fourth laser diode 4-19 is configured to send a fourth modulated signal to the fourth mach-zehnder modulator 4-110;
The fourth mach-zehnder modulator 4-110 is configured to receive another third radio frequency signal sent by the second phase-locked loop 4-17 and a fourth modulation signal sent by the fourth laser diode 4-19, adjust the another third radio frequency signal according to the fourth modulation signal, obtain another third radio frequency signal with the same wavelength as the initial signal, and send the another third radio frequency signal with the same wavelength as the initial signal to the second optical fiber isolator 4-111;
the second optical fiber isolator 4-111 is configured to receive another third radio frequency signal having the same wavelength as the initial signal and transmitted by the fourth mach-zehnder modulator 4-110, and transmit another third radio frequency signal having the same wavelength as the initial signal to the third optical circulator 4-12.
In particular, as shown in fig. 3, the first sub-remote device 4-1 not only receives the wavelength λ transmitted from the first remote device 3 0 And also receives the optical signal with wavelength lambda from the local side device 1 a Is provided. Wavelength lambda 0 After phase-locked regeneration through the optical fourth optical bandpass filter 4-15, the fourth photodetector 4-16, and the second phase-locked loop 4-17, the signal expression is:
Figure BDA0004066591600000161
Wherein Deltaτ 4 Is the superimposed delay jitter when the signal is transmitted by the first remote device 3 in a counter-clockwise direction via the optical fiber link 2 to the first sub-remote device 4-1. Wavelength lambda a Is passed through the firstAfter the five optical bandpass filters 4-13 and the fifth photodetectors 4-14, the signal expressions are:
Figure BDA0004066591600000162
wherein Deltaτ 5 Is the superimposed delay jitter when the signal is transmitted by the local end device 1 in a clockwise direction via the optical fiber link 2 to the first sub-remote device 4-1. Signal E 8 And signal E 9 The signal expression after mixing is:
Figure BDA0004066591600000163
the delay jitter generated by the transmission of the optical fiber link 2 satisfies the following conditions:
Δτ 4 +Δτ 5 ＝Δτ 1 (16)
recombined (11), so signal E 10 The method can be simplified to obtain:
Figure BDA0004066591600000171
it can be seen that the first sub-remote device 4-1 can resume generating the radio frequency signal E with the same frequency and phase as the local end device 1 m 。
In addition, the phase-locked regenerated signal in the first sub-remote device 4-1 is remodulated to a wavelength lambda 0 And is sent to the optical fiber link 2 through the second optical fiber isolator 4-111, the third optical circulator 4-12 and the second optical fiber coupler 4-11, so as to realize the connection transmission of the radio frequency signal by the next remote device.
In some embodiments, the second remote device 4 further comprises other first sub-remote devices 4-3 adjacent to the first sub-remote device 4-1;
The other first sub-remote devices 4-3 are configured to receive another third radio frequency signal with the same wavelength as the initial signal and sent by the second optical fiber coupler 4-11, receive a first sub-mixing filtering signal sent by the local end device 1, perform filtering phase locking on the other third radio frequency signal to obtain two fifth radio frequency signals, perform filtering processing on the first sub-mixing filtering signal to obtain a first sub-processed signal, and perform mixing processing on a target fifth radio frequency signal and the first sub-processed signal to obtain a radio frequency signal with the same frequency and phase as those of the reference signal, where the target fifth radio frequency signal is any one fifth radio frequency signal of the two fifth radio frequency signals.
In particular, as shown in fig. 4, the other first sub-remote devices 4-3 are remote devices adjacent to the first sub-remote device 4-1, and have the same structure as the first sub-remote device 4-1, and re-modulate the phase-locked regenerated signal in the first sub-remote device 4-1 to have a wavelength λ 0 And transmitted to the optical fiber link 2 through the second optical fiber isolator 4-111, the third optical circulator 4-12 and the second optical fiber coupler 4-11, and the other first sub-remote devices 4-3 receive the wavelength lambda transmitted by the first sub-remote device 4-1 transmitted by the optical fiber link 2 0 And the optical signal of the same frequency and phase with the local terminal equipment 1 is obtained, so as to realize the continuous transmission of the radio frequency signal.
In some embodiments, the second sub-remote device 4-2 comprises: a third optical fiber coupler 4-21, a fourth optical circulator 4-22, a seventh optical band pass filter 4-23, a seventh photodetector 4-24, a third phase locked loop 4-25, a sixth optical band pass filter 4-26, a sixth photodetector 4-27, a fourth mixer 4-28, a fifth laser diode 4-29, a fifth Mach-Zehnder modulator 4-210 and a third optical fiber isolator 4-211,
the optical interface of the third optical fiber coupler 4-21 is connected with the optical fiber link 2, the output end of the third optical fiber coupler 4-21 is respectively connected with the input ends of the sixth optical band-pass filter 4-26 and the fourth optical circulator 4-22, the output end of the fourth optical band-pass filter 4-22 is respectively connected with the input ends of the seventh optical fiber coupler 4-21, the output end of the seventh optical band-pass filter 4-23 is connected with the input end of the seventh optical detector 4-24, the output end of the seventh optical detector 4-24 is connected with the input end of the third phase-locked loop 4-25, the output end of the third phase-locked loop 4-25 is respectively connected with the input ends of the fourth mixer 4-28 and the fifth Mach-Zehnder modulator 4-210, the output end of the sixth optical band-pass filter 4-26 is connected with the input end of the sixth optical detector 4-27, the output end of the sixth optical detector 4-27 is connected with the input end of the fourth mixer 4-28, the output end of the fifth diode 4-29 is connected with the output end of the fifth optical isolator 4-210, and the output end of the fifth optical isolator 4-211 is connected with the output end of the fifth optical isolator 4-210;
The third optical fiber coupler 4-21 is configured to receive the second sub-mixing filtered signal sent by the local end device 1 and another first radio frequency signal sent by the first remote end device 3, send the other first radio frequency signal to the fourth optical circulator 4-22, and send the second sub-mixing filtered signal to the sixth optical band-pass filter 4-26;
the fourth optical circulator 4-22 is configured to receive another first radio frequency signal sent by the third optical fiber coupler 4-21 and send the other first radio frequency signal to the seventh optical band-pass filter 4-23;
the seventh optical bandpass filter 4-23 is configured to receive another first radio frequency signal sent by the fourth optical circulator 4-22, filter the another first radio frequency signal to obtain a filtered another first radio frequency signal, and send the filtered another first radio frequency signal to the seventh photodetector 4-24;
the seventh photodetector 4-24 is configured to receive the filtered further first radio frequency signal sent by the seventh optical bandpass filter 4-23 and send the filtered further first radio frequency signal to the third phase locked loop 4-25;
The third phase-locked loop 4-25 is configured to receive the filtered another first radio frequency signal sent by the seventh photo-detector 4-24, perform phase-locked regeneration on the filtered another first radio frequency signal to obtain two fourth radio frequency signals, send the target fourth radio frequency signal to the fourth mixer 4-28, and send another fourth radio frequency signal except the target fourth radio frequency signal to the fifth mach-zehnder modulator 4-210;
the sixth optical bandpass filter 4-26 is configured to receive the second sub-mixing filtered signal sent by the third optical fiber coupler 4-21, filter the second sub-mixing filtered signal to obtain a second sub-processed signal, and send the second sub-processed signal to the sixth photodetector 4-27;
the sixth photodetector 4-27 is configured to receive the second sub-processed signal transmitted by the sixth optical bandpass filter 4-26 and transmit the second sub-processed signal to the fourth mixer 4-28;
the fourth mixer 4-18 is configured to receive the target fourth radio frequency signal sent by the third phase-locked loop 4-25 and the second sub-processed signal sent by the sixth photo detector 4-27, and perform mixing processing on the target fourth radio frequency signal and the second sub-processed signal to obtain radio frequency signals with the same frequency and phase as the reference signal;
The fifth laser diode 4-29 is configured to send a fifth modulated signal to the fifth mach-zehnder modulator 4-210;
the fifth mach-zehnder modulator 4-210 is configured to receive another fourth radio frequency signal sent by the third phase-locked loop 4-25 and a fifth modulation signal sent by the fifth laser diode 4-29, adjust the another fourth radio frequency signal according to the fifth modulation signal, obtain another fourth radio frequency signal with the same wavelength as the initial signal, and send the another fourth radio frequency signal with the same wavelength as the initial signal to the third optical fiber isolator 4-211;
the third optical fiber isolator 4-211 is configured to receive another fourth radio frequency signal with the same wavelength as the initial signal sent by the fifth mach-zehnder modulator 4-210, and send the another fourth radio frequency signal with the same wavelength as the initial signal to the fourth optical circulator 4-22, so that the another fourth radio frequency signal with the same wavelength as the initial signal is sent to the third optical fiber coupler 4-21 through the fourth optical circulator 4-22.
In practice, as shown in FIG. 3, the second sub-remote device 4-2 receives not only the wavelength lambda from the first remote device 3, in the same way as the first sub-remote device 4-1 0 And also receives the optical signal with wavelength lambda from the local side device 1 b Is provided. Wavelength lambda 0 After the optical signals of the third optical band-pass filter 4-23, the seventh photoelectric detector 4-24 and the third phase-locked loop 4-25 are subjected to phase-locked regeneration, the signal expression is as follows:
Figure BDA0004066591600000191
wherein Deltaτ 6 Is the superimposed delay jitter when a signal is transmitted by the first remote device 3 in a clockwise direction via the optical fiber link 2 to the second sub-remote device 4-2. Wavelength lambda b After passing through the sixth optical bandpass filter 4-26 and the sixth photodetector 4-27, the signal expression is:
Figure BDA0004066591600000201
wherein Deltaτ 7 Is the superimposed delay jitter when the signal is transmitted by the local end device 1 in a counter-clockwise direction via the optical fiber link 2 to the second sub-remote device 4-2. Signal E 11 And signal E 1 The signal expression after x-mixing is:
Figure BDA0004066591600000202
the delay jitter generated by the transmission of the optical fiber link 2 satisfies the following conditions:
Δτ 6 +Δτ 7 ＝Δτ 2 (21)
recombined (11), so signal E 13 The method can be simplified to obtain:
Figure BDA0004066591600000203
so at the second sub-remote device 4-2, the same frequency and phase of the radio frequency signal E with the local end can be recovered m 。
At the same time, the second sub-remote device 4-2 phase-locked loop phase-locked regenerated signal is remodulated to the wavelength lambda 0 And the optical signals are sent to the optical fiber link 2 through the third optical fiber isolator 4-211, the fourth optical circulator 4-22 and the third optical fiber coupler 4-21, so that the connection transmission of radio frequency signals among remote devices is realized.
In some embodiments, the second remote device 4 further comprises other second sub-remote devices 4-4 adjacent to the second sub-remote device 4-2;
the other second sub-remote devices 4-4 are configured to receive another path of fourth radio frequency signal with the same wavelength as the initial signal and sent by the third optical fiber coupler 4-21, receive a second sub-mixing filtering signal sent by the local end device 1, perform filtering phase locking on the other path of fourth radio frequency signal with the same wavelength as the initial signal to obtain two paths of sixth radio frequency signals, perform filtering processing on the second sub-mixing filtering signal to obtain a second sub-processed signal, and perform mixing processing on a target sixth radio frequency signal and the second sub-processed signal to obtain a radio frequency signal with the same frequency and phase as those of the reference signal, where the target sixth radio frequency signal is any one path of sixth radio frequency signal of the two paths of sixth radio frequency signals.
In particular, as shown in fig. 4, the other second sub-remote devices 4-4 are remote devices adjacent to the second sub-remote device 4-2, and have the same structure as the second sub-remote device 4-2, and re-modulate the phase-locked regenerated signal in the second sub-remote device 4-2 to have a wavelength λ 0 And is transmitted into the optical fiber link 2 through the third optical fiber isolator 4-211, the fourth optical circulator 4-22 and the third optical fiber coupler 4-21, and the other second sub-remote devices 4-4 receive the second transmitted by the optical fiber link 2The sub-remote device 4-2 transmits a wavelength lambda 0 And the optical signal of the same frequency and phase with the local terminal equipment 1 is obtained, so as to realize the continuous transmission of the radio frequency signal.
It should be noted that, the method of the embodiments of the present application may be performed by a single device, for example, a computer or a server. The method of the embodiment can also be applied to a distributed scene, and is completed by mutually matching a plurality of devices. In the case of such a distributed scenario, one of the devices may perform only one or more steps of the methods of embodiments of the present application, and the devices may interact with each other to complete the methods.
It should be noted that some embodiments of the present application are described above. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the application (including the claims) is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the present application, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of brevity.
Additionally, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown within the provided figures, in order to simplify the illustration and discussion, and so as not to obscure the embodiments of the present application. Furthermore, the devices may be shown in block diagram form in order to avoid obscuring the embodiments of the present application, and this also takes into account the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform on which the embodiments of the present application are to be implemented (i.e., such specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the application, it should be apparent to one skilled in the art that embodiments of the application can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative in nature and not as restrictive.
While the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of those embodiments will be apparent to those skilled in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.
The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalents, improvements and/or the like which are within the spirit and principles of the embodiments are intended to be included within the scope of the present application.

Claims (10)

1. An optical fiber ring network radio frequency signal stable transmission system, which is characterized by comprising: a local end device and a plurality of remote end devices connected by fiber optic links, the plurality of remote end devices including a first remote end device and a second remote end device,
the local terminal equipment is configured to receive an initial signal sent by the first remote terminal equipment, perform frequency mixing filtering on the initial signal and a reference signal generated by the local terminal equipment to obtain a frequency mixing filtering signal, and send the frequency mixing filtering signal to the first remote terminal equipment and the second remote terminal equipment respectively;
The first remote device is configured to generate an initial signal, send the initial signal to the local device, receive a mixing filtering signal sent by the local device, perform filtering phase locking on the mixing filtering signal to obtain two paths of first radio frequency signals, perform frequency multiplication processing on a target first radio frequency signal to obtain a radio frequency signal with the same frequency and phase as the reference signal, and send another path of first radio frequency signal except the target first radio frequency signal to the second remote device, wherein the target first radio frequency signal is any one path of first radio frequency signal of the two paths of first radio frequency signals;
the second remote device is configured to receive the mixing filtering signal sent by the local device and the other path of first radio frequency signal sent by the first remote device, filter and lock the other path of first radio frequency signal to obtain two paths of second radio frequency signals, filter the mixing filtering signal to obtain a processed signal, and mix the target second radio frequency signal and the processed signal to obtain radio frequency signals with the same frequency and phase as those of the reference signal, wherein the target second radio frequency signal is any one path of second radio frequency signal of the two paths of second radio frequency signals.
2. The system of claim 1, wherein the second remote device comprises at least one first sub-remote device and/or at least one second sub-remote device, the mixed filtered signal comprising a first sub-mixed filtered signal and/or a second sub-mixed filtered signal;
the first sub-remote device is configured to receive a first sub-mixing filtering signal sent by the local terminal device and the other path of first radio frequency signal sent by the first remote device, perform filtering phase locking on the other path of radio frequency signal to obtain two paths of third radio frequency signals, perform filtering processing on the first sub-mixing filtering signal to obtain a first sub-processed signal, perform mixing processing on a target third radio frequency signal and the first sub-processed signal to obtain radio frequency signals with the same frequency and phase as those of the reference signal, wherein the target third radio frequency signal is any one path of third radio frequency signal of the two paths of third radio frequency signals, and the first sub-mixing filtering signal is a signal sent by the local terminal device along the clockwise direction;
the second sub-remote device is configured to receive a second sub-mixing filtering signal sent by the local terminal device and the other path of first radio frequency signal sent by the first remote device, filter and lock the other path of first radio frequency signal to obtain two paths of fourth radio frequency signals, filter the second sub-mixing filtering signal to obtain a second sub-processed signal, and mix the target fourth radio frequency signal and the second sub-processed signal to obtain radio frequency signals with the same frequency and phase as the reference signal, wherein the target fourth radio frequency signal is any one path of fourth radio frequency signal of the two paths of fourth radio frequency signals, and the second sub-mixing filtering is a signal sent by the local terminal device along the anticlockwise direction.
3. The system of claim 2, wherein the local side device comprises: an optical circulator system, an optical bandpass filter system, a photodetector system, a signal source, a mixer system, a bandpass filter system, a laser diode system, and a Mach-Zehnder modulator system,
the optical interface of the optical circulator system is connected with an optical fiber link, the output end of the optical circulator system is connected with the input end of an optical band pass filter system, the output end of the optical band pass filter system is connected with the input end of a photoelectric detector system, the output end of a signal source is connected with the input end of a mixer system, the output end of the mixer system is connected with the input end of the band pass filter system, the output end of the band pass filter system is connected with the input end of a Mach-Zehnder modulator system, the output end of a laser diode system is connected with the input end of the Mach-Zehnder modulator system, and the output end of the Mach-Zehnder modulator system is connected with the input end of the optical circulator system;
the optical circulator system is configured to receive an initial signal transmitted over the optical fiber link and to send the initial signal to the optical bandpass filter system;
The optical band-pass filtering system is configured to receive an initial signal sent by the optical circulator system, perform filtering processing on the initial signal to obtain a filtered signal, and send the filtered signal to the photoelectric detector system;
the photodetector system is configured to receive the filtered signal transmitted by the optical bandpass filter system, convert the filtered signal from an optical signal to an electrical signal, and transmit the filtered signal converted to the electrical signal to the mixer system;
the signal source is configured to provide a reference signal for the mixer-system;
the mixer system is configured to receive the reference signal and the filtered signal converted into an electrical signal transmitted by the photodetector system, mix the reference signal and the filtered signal converted into an electrical signal to obtain a mixed signal, and transmit the mixed signal to the band-pass filter system;
the band-pass filter system is configured to receive the mixed signal sent by the mixer system, filter the mixed signal to obtain a mixed filter signal, and send the mixed filter signal to the Mach-Zehnder modulator system;
The laser diode system is configured to send a modulation signal to the Mach-Zehnder modulator system so as to control the Mach-Zehnder modulator system to adjust the mixing filtering signal to obtain a preset wavelength optical signal;
the Mach-Zehnder modulator system is configured to receive the mixed filtered signal sent by the band-pass filter system and the modulated signal sent by the laser diode system, adjust the mixed filtered signal to the same wavelength as the preset wavelength optical signal according to the modulated signal, obtain an adjusted mixed filtered signal, and send the adjusted mixed filtered signal to the optical circulator system, so that the optical circulator system can transmit the adjusted mixed filtered signal to the first remote device and the second remote device through the optical fiber link.
4. The system of claim 3, wherein the optical circulator system comprises a first optical circulator, the optical bandpass filter system comprises a first optical bandpass filter, the photodetector system comprises a first photodetector, the mixer system comprises a first mixer, the bandpass filter system comprises a first bandpass filter, the laser diode system comprises a first laser diode, the Mach-Zehnder modulator system comprises a first Mach-Zehnder modulator,
The optical interface of the first optical circulator is connected with an optical fiber link, the output end of the first optical circulator is connected with the input end of a first optical band-pass filter, the output end of the first optical band-pass filter is connected with the input end of a first photoelectric detector, the output end of the signal source is connected with the input end of a first mixer, the output end of the first photoelectric detector is connected with the input end of the first mixer, the output end of the first mixer is connected with the input end of the first band-pass filter, the output end of the first band-pass filter is connected with the input end of a first Mach-Zehnder modulator, the output end of the first laser diode is connected with the input end of the first Mach-Zehnder modulator, and the output end of the first Mach-Zehnder modulator is connected with the input end of the first optical circulator;
the first optical circulator is configured to receive an initial signal transmitted in a counterclockwise direction through the optical fiber link and to transmit the initial signal to the first optical bandpass filter;
the first optical band-pass filter is configured to receive an initial signal sent by the first optical circulator, perform filtering processing on the initial signal to obtain a first filtered signal, and send the first filtered signal to the first photoelectric detector;
The first photodetector is configured to receive a first filtered signal sent by the first optical bandpass filter, convert the first filtered signal from an optical signal to an electrical signal, and send the first filtered signal converted to the electrical signal to the first mixer;
the first mixer is configured to receive the reference signal and a first filtered signal converted into an electrical signal sent by the first photodetector, mix the reference signal and the first filtered signal converted into the electrical signal to obtain a first mixed signal, and send the first mixed signal to the first band-pass filter;
the first band-pass filter is configured to receive the first mixed signal sent by the first mixer, filter the first mixed signal to obtain a first sub-mixed filtered signal, and send the first sub-mixed filtered signal to the first Mach-Zehnder modulator;
the first laser diode is configured to send a first modulation signal to the first Mach-Zehnder modulator so as to control the first Mach-Zehnder modulator to adjust the first sub-mixing filtering signal to obtain an optical signal with a preset wavelength;
The first Mach-Zehnder modulator is configured to receive the first sub-mixing filtered signal sent by the first band-pass filter, adjust the first sub-mixing filtered signal to the same wavelength as the preset wavelength optical signal, obtain an adjusted first sub-mixing filtered signal, and send the adjusted first sub-mixing filtered signal to the first optical circulator, so that the first optical circulator transmits the adjusted first sub-mixing filtered signal to the first remote device and the first sub-remote device in a clockwise direction through the optical fiber link.
5. The system of claim 3 or 4, wherein the optical circulator system comprises a second optical circulator, the optical bandpass filter system comprises a second optical bandpass filter, the photodetector system comprises a second photodetector, the mixer system comprises a second mixer, the bandpass filter system comprises a second bandpass filter, the laser diode system comprises a second laser diode, the mach-zehnder modulator system comprises a second mach-zehnder modulator,
the optical interface of the second optical circulator is connected with an optical fiber link, the output end of the second optical circulator is connected with the input end of a second optical band-pass filter, the output end of the second optical band-pass filter is connected with the input end of a second photoelectric detector, the output end of the signal source is connected with the input end of a second mixer, the output end of the second photoelectric detector is connected with the input end of the second mixer, the output end of the second mixer is connected with the input end of a second band-pass filter, the output end of the second band-pass filter is connected with the input end of a second Mach-Zehnder modulator, the output end of the second laser diode is connected with the input end of the second Mach-Zehnder modulator, and the output end of the second Mach-Zehnder modulator is connected with the input end of the second optical circulator;
The second optical circulator is configured to receive an initial signal transmitted in a clockwise direction over the optical fiber link and to send the initial signal to the second optical bandpass filter;
the second optical band-pass filter is configured to receive an initial signal sent by the second optical circulator, perform filtering processing on the initial signal to obtain a second filtered signal, and send the second filtered signal to the second photodetector;
the second photodetector is configured to receive a second filtered signal sent by the second optical bandpass filter, convert the second filtered signal from an optical signal to an electrical signal, and send the second filtered signal converted to the electrical signal to the second mixer;
the second mixer is configured to receive the reference signal and a second filtered signal converted into an electrical signal sent by the second photodetector, mix the reference signal and the second filtered signal converted into an electrical signal to obtain a second mixed signal, and send the second mixed signal to the second band-pass filter;
the second band-pass filter is configured to receive the second mixed signal sent by the second mixer, filter the second mixed signal to obtain a second sub-mixed filtered signal, and send the second sub-mixed filtered signal to the second Mach-Zehnder modulator;
The second laser diode is configured to send a second modulation signal to the second Mach-Zehnder modulator so as to control the second Mach-Zehnder modulator to adjust the second sub-mixing filtering signal to obtain an optical signal with a preset wavelength;
the second mach-zehnder modulator is configured to receive the second sub-mixing filtered signal sent by the second band-pass filter and the second modulated signal sent by the second laser diode, adjust the second sub-mixing filtered signal to the same wavelength as the preset wavelength optical signal according to the second modulated signal, obtain an adjusted second sub-mixing filtered signal, and send the adjusted second sub-mixing filtered signal to the second optical circulator, so that the second optical circulator transmits the adjusted second sub-mixing filtered signal to the first remote device and the second sub-remote device along a counterclockwise direction through the optical fiber link.
6. The system of claim 5, wherein the first remote device comprises: a first phase-locked loop, a third laser diode, a third Mach-Zehnder modulator, a first optical fiber isolator, a first optical fiber coupler, a third optical band-pass filter, a third photodetector and a first frequency multiplier,
The output end of the first phase-locked loop is respectively connected with the input end of the third Mach-Zehnder modulator and the input end of the first frequency multiplier, the output end of the third laser diode is connected with the input end of the third Mach-Zehnder modulator, the output end of the third Mach-Zehnder modulator is connected with the input end of the first optical fiber isolator, the output end of the first optical fiber isolator is connected with the input end of the first optical fiber coupler, the optical interface of the first optical fiber coupler is connected with the optical fiber link, the output end of the first optical fiber coupler is connected with the input end of the third optical band pass filter, the output end of the third optical band pass filter is connected with the input end of the third photoelectric detector, and the output end of the third photoelectric detector is connected with the input end of the first phase-locked loop;
the first phase-locked loop is configured to generate an electrical signal for controlling the third mach-zehnder modulator;
the third laser diode is configured to send a third modulated signal to the third mach-zehnder modulator;
the third Mach-Zehnder modulator is configured to receive the electrical signal sent by the first phase-locked loop and a third modulation signal sent by the third laser diode, adjust the electrical signal sent by the first phase-locked loop according to the third modulation signal to obtain an initial signal with a preset wavelength, send the initial signal to the first optical fiber isolator, receive another path of first radio frequency signal sent by the first phase-locked loop, and send the other path of first radio frequency signal to the first optical fiber isolator;
The first optical fiber isolator is configured to send the initial signal to the first optical fiber coupler, receive another path of first radio frequency signal sent by the third mach-zehnder modulator, and send the other path of first radio frequency signal to the first optical fiber coupler;
the first optical fiber coupler is configured to receive an initial signal sent by the first optical fiber isolator, send the initial signal to the local end device, receive a first sub-mixing filtering signal sent by the local end device, send the first sub-mixing filtering signal to the third optical band-pass filter, receive the other path of first radio frequency signal sent by the first optical fiber isolator, and send the other path of first radio frequency signal to the first sub-remote end device and/or the second sub-remote end device;
the third optical band-pass filter is configured to receive the first sub-mixing filtered signal sent by the first optical fiber coupler, filter the first sub-mixing filtered signal to obtain a filtered first sub-mixing filtered signal, and send the filtered first sub-mixing filtered signal to the third photodetector;
The third photodetector is configured to receive the filtered first sub-mixing filtered signal sent by the third optical band-pass filter, send the filtered first sub-mixing filtered signal to the first phase-locked loop, so that the first phase-locked loop performs phase discrimination processing on the filtered first sub-mixing filtered signal according to the initial signal to obtain two paths of first radio frequency signals, send the target first radio frequency signal to the first frequency multiplier, and send another path of first radio frequency signal except the target first radio frequency signal to the third Mach-Zehnder modulator;
the first frequency multiplier is configured to receive the target first radio frequency signal sent by the first phase-locked loop, and perform frequency multiplication processing on the target first radio frequency signal to obtain a radio frequency signal with the same frequency and phase as the reference signal.
7. The system of claim 6, wherein the first sub-remote device comprises: a second optical fiber coupler, a third optical circulator, a fifth optical band-pass filter, a fifth photoelectric detector, a fourth optical band-pass filter, a fourth photoelectric detector, a second phase-locked loop, a third mixer, a fourth laser diode, a fourth Mach-Zehnder modulator and a second optical fiber isolator,
The optical interface of the second optical fiber coupler is connected with the optical fiber link, the output end of the second optical fiber coupler is connected with the input ends of the fourth optical band-pass filter and the third optical circulator, the output end of the third optical band-pass filter is respectively connected with the input end of the second optical fiber coupler and the input end of the fifth optical band-pass filter, the output end of the fifth optical band-pass filter is connected with the input end of the fifth photoelectric detector, the output end of the fourth optical band-pass filter is connected with the input end of the fourth photoelectric detector, the output end of the fourth optical band-pass filter is connected with the input end of the second phase-locked loop, the output end of the second phase-locked loop is respectively connected with the input end of the fourth Mach-Zehnder modulator and the input end of the third mixer, the output end of the fourth laser diode is connected with the input end of the fourth Mach-Zehnder modulator, the output end of the fourth Mach-Zehnder modulator is connected with the input end of the second optical fiber isolator, and the output end of the second optical fiber isolator is connected with the input end of the third optical circulator;
the second optical fiber coupler is configured to receive a first sub-mixing filtering signal sent by the local end device and another first radio frequency signal sent by the first remote end device, send the first sub-mixing filtering signal to the third optical circulator, and send the other first radio frequency signal to the fourth optical band-pass filter;
The third optical circulator is configured to receive the first sub-mixing filtered signal sent by the second optical fiber coupler and send the first sub-mixing filtered signal to the fifth optical band-pass filter;
the fifth optical bandpass filter is configured to receive the first sub-mixing filtering signal sent by the third optical circulator, filter the first sub-mixing filtering signal to obtain a first sub-processed signal, and send the first sub-processed signal to the fifth photodetector;
the fifth photodetector is configured to receive the first sub-processed signal sent by the fifth optical bandpass filter and send the first sub-processed signal to the third mixer;
the fourth optical band-pass filter is configured to receive another path of first radio frequency signals sent by the second optical fiber coupler, filter the another path of first radio frequency signals to obtain a filtered another path of first radio frequency signals, and send the filtered another path of first radio frequency signals to the fourth photoelectric detector;
the fourth photodetector is configured to receive the filtered another first radio frequency signal sent by the fourth optical bandpass filter and send the filtered another first radio frequency signal to the second phase-locked loop;
The second phase-locked loop is configured to receive the filtered other path of the first radio frequency signal sent by the fourth photoelectric detector, perform phase-locked regeneration on the filtered other path of the first radio frequency signal to obtain two paths of third radio frequency signals, send a target third radio frequency signal to the third mixer, and send another path of third radio frequency signal except the target third radio frequency signal to the fourth Mach-Zehnder modulator;
the third mixer is configured to receive a target third radio frequency signal sent by the second phase-locked loop and a first sub-processed signal sent by the fifth photoelectric detector, and mix the target third radio frequency signal and the first sub-processed signal to obtain a radio frequency signal with the same frequency and phase as the reference signal;
the fourth laser diode is configured to send a fourth modulated signal to the fourth mach-zehnder modulator;
the fourth mach-zehnder modulator is configured to receive another third radio frequency signal sent by the second phase-locked loop and a fourth modulation signal sent by the fourth laser diode, adjust the another third radio frequency signal according to the fourth modulation signal, obtain another third radio frequency signal with the same wavelength as the initial signal, and send another third radio frequency signal with the same wavelength as the initial signal to the second optical fiber isolator;
The second optical fiber isolator is configured to receive another third radio frequency signal with the same wavelength as the initial signal sent by the fourth mach-zehnder modulator, and send another third radio frequency signal with the same wavelength as the initial signal to the third optical circulator.
8. The system of claim 7, wherein the second remote device further comprises other first sub-remote devices adjacent to the first sub-remote device;
the other first sub-remote devices are configured to receive another third radio frequency signal with the same wavelength as the initial signal and sent by the second optical fiber coupler, receive a first sub-mixing filtering signal sent by the local end device, perform filtering phase locking on the other third radio frequency signal to obtain two fifth radio frequency signals, perform filtering processing on the first sub-mixing filtering signal to obtain a first sub-processed signal, and perform mixing processing on a target fifth radio frequency signal and the first sub-processed signal to obtain a radio frequency signal with the same frequency and phase as those of the reference signal, wherein the target fifth radio frequency signal is any one of the two fifth radio frequency signals.
9. The system of claim 6, wherein the second sub-remote device comprises: a third optical fiber coupler, a fourth optical circulator, a seventh optical band-pass filter, a seventh photoelectric detector, a third phase-locked loop, a sixth optical band-pass filter, a sixth photoelectric detector, a fourth mixer, a fifth laser diode, a fifth Mach-Zehnder modulator and a third optical fiber isolator,
the optical interface of the third optical fiber coupler is connected with the optical fiber link, the output end of the third optical fiber coupler is respectively connected with the input ends of the sixth optical band-pass filter and the fourth optical circulator, the output end of the fourth optical circulator is respectively connected with the input ends of the seventh optical band-pass filter and the third optical fiber coupler, the output end of the seventh optical band-pass filter is connected with the input end of the seventh optical fiber isolator, the output end of the seventh optical fiber isolator is connected with the input end of the third phase-locked loop, the output end of the third phase-locked loop is respectively connected with the input ends of the fourth mixer and the fifth Mach-Zehnder modulator, the output end of the sixth optical band-pass filter is connected with the input end of the sixth optical detector, the output end of the fifth laser diode is connected with the input end of the fifth Mach-Zehnder modulator, and the output end of the fifth laser diode is connected with the input end of the third optical fiber isolator;
The third optical fiber coupler is configured to receive a second sub-mixing filtering signal sent by the local end device and another first radio frequency signal sent by the first remote end device, send the other first radio frequency signal to the fourth optical circulator, and send the second sub-mixing filtering signal to the sixth optical band-pass filter;
the fourth optical circulator is configured to receive another first radio frequency signal sent by the third optical fiber coupler and send the other first radio frequency signal to the seventh optical band-pass filter;
the seventh optical band-pass filter is configured to receive another first radio frequency signal sent by the fourth optical circulator, filter the another first radio frequency signal to obtain a filtered another first radio frequency signal, and send the filtered another first radio frequency signal to the seventh photoelectric detector;
the seventh photodetector is configured to receive the filtered another first radio frequency signal sent by the seventh optical bandpass filter and send the filtered another first radio frequency signal to the third phase-locked loop;
The third phase-locked loop is configured to receive the filtered other path of the first radio frequency signal sent by the seventh photoelectric detector, perform phase-locked regeneration on the filtered other path of the first radio frequency signal to obtain two paths of fourth radio frequency signals, send a target fourth radio frequency signal to the fourth mixer, and send another path of fourth radio frequency signal except the target fourth radio frequency signal to the fifth Mach-Zehnder modulator;
the sixth optical band-pass filter is configured to receive the second sub-mixing filtering signal sent by the third optical fiber coupler, filter the second sub-mixing filtering signal to obtain a second sub-processed signal, and send the second sub-processed signal to the sixth photodetector;
the sixth photodetector is configured to receive the second sub-processed signal sent by the sixth optical bandpass filter and send the second sub-processed signal to the fourth mixer;
the fourth mixer is configured to receive a target fourth radio frequency signal sent by the third phase-locked loop and a second sub-processed signal sent by the sixth photoelectric detector, and mix the target fourth radio frequency signal and the second sub-processed signal to obtain a radio frequency signal with the same frequency and phase as the reference signal;
The fifth laser diode is configured to send a fifth modulated signal to the fifth mach-zehnder modulator;
the fifth Mach-Zehnder modulator is configured to receive another path of fourth radio frequency signal sent by the third phase-locked loop and a fifth modulation signal sent by the fifth laser diode, adjust the another path of fourth radio frequency signal according to the fifth modulation signal to obtain another path of fourth radio frequency signal with the same wavelength as the initial signal, and send the another path of fourth radio frequency signal with the same wavelength as the initial signal to the third optical fiber isolator;
the third optical fiber isolator is configured to receive another fourth radio frequency signal with the same wavelength as the initial signal sent by the fifth mach-zehnder modulator, and send the another fourth radio frequency signal with the same wavelength as the initial signal to the fourth optical circulator, so that the another fourth radio frequency signal with the same wavelength as the initial signal is sent to the third optical fiber coupler through the fourth optical circulator.
10. The system of claim 9, wherein the second remote device further comprises other second sub-remote devices adjacent to the second sub-remote device;
The other second sub-remote devices are configured to receive another path of fourth radio frequency signal with the same wavelength as the initial signal and sent by the third optical fiber coupler, receive a second sub-mixing filtering signal sent by the local end device, perform filtering phase locking on the other path of fourth radio frequency signal with the same wavelength as the initial signal to obtain two paths of sixth radio frequency signals, perform filtering processing on the second sub-mixing filtering signal to obtain a second sub-processed signal, and perform mixing processing on a target sixth radio frequency signal and the second sub-processed signal to obtain a radio frequency signal with the same frequency and phase as those of the reference signal, wherein the target sixth radio frequency signal is any one path of sixth radio frequency signal of the two paths of sixth radio frequency signals.
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