CN115664527A - Optical module and optical communication system - Google Patents
Optical module and optical communication system Download PDFInfo
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- CN115664527A CN115664527A CN202211152359.1A CN202211152359A CN115664527A CN 115664527 A CN115664527 A CN 115664527A CN 202211152359 A CN202211152359 A CN 202211152359A CN 115664527 A CN115664527 A CN 115664527A
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Abstract
The application discloses optical module and optical communication system, the optical module includes: the optical transmission component comprises a laser driver and a laser, and the laser driver is used for driving the laser to transmit an optical signal according to the received first electrical signal; the optical receiving component comprises an optical detector and an amplifier, and the optical detector is used for converting a received optical signal into a second electric signal and then transmitting the second electric signal to the amplifier for amplification; the optical transmitting assembly and/or the optical receiving assembly do not include a signal compensation circuit. On the premise of ensuring normal data transmission of the optical module, the optical module simplifies the scheme design of the optical module by omitting partial devices, namely omitting devices used for signal compensation in the light emitting assembly or the light receiving assembly, so as to achieve the purposes of reducing the power consumption of the optical module, the cost of an optical link between network equipment and the heat dissipation requirement of a network equipment port.
Description
Technical Field
The application relates to the technical field of optical communication, in particular to an optical module and an optical communication system.
Background
With the development of big data technology, more and more data centers are beginning to use optical module products as transmission media for high-speed data. In a data center, considering that the interconnection distance between most network devices is several tens of meters, a multi-mode optical module product with a transmission distance within 100 meters is generally adopted.
However, the power consumption of the optical module in the current market is relatively high, so that not only the cost of the optical link between the network devices is high, but also the requirement for heat dissipation of the network device port is high.
Disclosure of Invention
The present invention is directed to an optical module and an optical communication system that address the above-described deficiencies of the prior art, and the object is achieved by the following means.
A first aspect of the application proposes an optical module comprising:
a light emitting assembly comprising a laser driver and a laser, the laser driver for driving the laser to emit a light signal in accordance with a received first electrical signal;
the optical receiving component comprises an optical detector and an amplifier, and the optical detector is used for converting a received optical signal into a second electric signal and then transmitting the second electric signal to the amplifier for amplification;
wherein the light emitting component and/or the light receiving component do not include a signal compensation circuit.
In some embodiments of the present application, the optical receiving component further includes a signal compensation circuit connected to the amplifier, for performing compensation processing on the amplified second electrical signal.
In some embodiments of the present application, the signal compensation circuit includes a CDR chip.
In some embodiments of the present application, the signal compensation circuit comprises a DSP chip.
In some embodiments of the present application, the amplifier comprises a linear TIA.
In some embodiments of the present application, the laser driver comprises a linear laser driver.
In some embodiments of the present application, the optical module is configured to connect with an external network device; and the amplifier is used for amplifying the second electric signal and then transmitting the second electric signal to the network equipment for compensation processing.
A second aspect of the present application proposes an optical communication system, the system comprising an optical fiber, a network device, and the optical module according to the first aspect described above; the optical module is respectively connected with the network equipment and the optical fiber.
In some embodiments of the present application, an electrical interface for transmitting electrical signals and an optical interface for transmitting optical signals are disposed on the optical module; the optical module is connected with the network equipment through the electrical interface, and the optical module is connected with the optical fiber through the optical interface.
In some embodiments of the present application, the network device comprises a processor; the laser driver and the amplifier in the optical module are both connected with the processor; and the laser and the optical detector in the optical module are both connected with the optical fiber.
Based on the optical module and the optical communication system described in the first aspect and the second aspect, the present application has at least the following beneficial effects or advantages:
compared with the original optical module, on the premise of ensuring the normal data transmission of the optical module, the optical module simplifies the scheme design of the optical module by omitting part of devices in the optical module, namely omitting devices used for signal compensation in the light emitting assembly and/or the light receiving assembly, so that the purposes of reducing the power consumption of the optical module, the cost of an optical link of network equipment and the heat dissipation requirement of a network equipment port are achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic structural diagram of a light module according to an exemplary embodiment of the present application;
fig. 2 is a specific schematic diagram of an optical module according to the embodiment shown in fig. 1;
fig. 3 is a schematic structural diagram of another optical module shown in the present application according to an exemplary embodiment;
fig. 4 is a schematic diagram of a specific structure of an optical module according to the embodiment shown in fig. 3;
fig. 5 is a schematic diagram of another optical module shown in the embodiment of fig. 3 according to the present application;
FIG. 6 is a block diagram illustrating an optical communication system according to an exemplary embodiment of the present application;
fig. 7 is a schematic diagram illustrating a specific connection between a network device and an optical module according to the embodiment shown in fig. 6;
fig. 8 is a schematic diagram illustrating a specific connection between another network device and an optical module according to the embodiment shown in fig. 6.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of optical communication systems and methods consistent with aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if," as used herein, may be interpreted as "at \8230; \8230when" or "when 8230; \823030when" or "in response to a determination," depending on the context.
In a data center, the interconnection distance between network device ports is not fixed, but is mostly several tens of meters, the transmission distance supported by Active or passive cables is relatively limited, and the longest transmission distance is about 10 meters, for example, the longest transmission distance supported by a DAC (Direct access Cable) is about 5 meters, the longest transmission distance supported by AEC (Active Electrical Cable) and ACC (Active Copper Cable) is about 10 meters, and the transmission distance supported by an optical module product is longer, and the longest transmission distance supported by the optical module product is about 100 meters, taking a multimode optical module as an example, so in the data center, the optical module is mostly used to implement short-distance interconnection application of the network device ports.
However, the inventor finds that, if the optical module product provided in the market is directly applied to a short-distance interconnection scenario, since the optical module contains some devices with relatively large performance margins, not only is the problem of chip resource waste existed, but also the power consumption of the optical module is relatively high, which not only increases the cost of the optical link between network devices, but also has a high heat dissipation requirement on the network device port.
In order to solve the above technical problems, according to the present application, on the premise of ensuring that the optical module normally transmits data, part of devices therein are omitted to simplify the scheme design of the optical module, that is, to omit devices for performing signal compensation in the optical transmitting assembly and/or the optical receiving assembly, so as to achieve the purpose of reducing the power consumption of the optical module, the cost of an optical link between network devices, and the heat dissipation requirement on a network device port.
It should be noted that, since the network device itself performs a certain degree of compensation processing on the electrical signal, even if the device dedicated for signal compensation in the optical module is omitted, the electrical signal transmitted by the optical module can be compensated in a balanced manner through the network device, thereby meeting the requirement of short-distance interconnection between network devices.
In order to make the technical solutions of the present application better understood, the following detailed description is provided for the optical module and the optical communication system provided in the present application with reference to the accompanying drawings and specific embodiments. It is to be understood that, in the following embodiments, the same or corresponding contents may be mutually referred, and for simplicity and convenience of description, the subsequent description is not repeated.
Referring to fig. 1, the optical module includes an optical transmitter module including a laser driver and a laser, and an optical receiver module including a photodetector and an amplifier. The optical transmitter assembly is used for converting the received first electrical signal into an optical signal and outputting the optical signal, and the optical receiver assembly is used for converting the received optical signal into a second electrical signal and outputting the second electrical signal.
The difference between the optical module provided by the present application and the existing optical module is that the light emitting assembly and/or the light receiving assembly do not comprise a device for signal compensation.
In fig. 1, neither the light emitting module nor the light receiving module includes a signal compensation device. It is of course also possible that the light emitting module does not include the signal compensation device and the light receiving module includes the signal compensation device, or that the light emitting module includes the signal compensation device and the light receiving module does not include the signal compensation device.
Specifically, in the light emitting assembly, the laser driver is used for driving the laser to emit a light signal according to the received first electric signal. In the light receiving module, the light detector is used for converting the received light signal into a second electric signal, and the amplifier is used for amplifying the second electric signal.
Based on the above description, it can be known that, in the present application, on the premise of ensuring that the optical module normally transmits data, part of devices therein are omitted to simplify the optical module scheme design, that is, to omit devices for performing signal compensation in the optical transmitting assembly and/or the optical receiving assembly, so as to achieve the purpose of reducing the power consumption of the optical module, the cost of an optical link between network devices, and the heat dissipation requirement on a network device port.
It is to be understood that the above-mentioned "first electrical signal" and "second electrical signal" are both electrical signals, and the "first" and "second" are only used for distinguishing whether the light receiving component or the light emitting component transmits the electrical signals.
It should be noted that the signal compensation device omitted in this application is specifically used to perform some optimization processes such as equalization, clock recovery, amplification, or modulation and demodulation on the electrical signal, and in the short-distance interconnection scenario, these optimization processes have a relatively large performance margin. Because the received electrical signals are usually compensated to a certain extent at the network equipment side, and the compensation process can also improve the degradation problem of the electrical signals, even if components dedicated for signal compensation in the optical module are omitted, the electrical signals transmitted by the optical module can be compensated in a balanced manner through the network equipment, so that the requirement of short-distance interconnection among the network equipment is met.
Therefore, in specific implementation, the optical module is used for connecting with an external network device, and the amplifier in the optical receiving component is specifically used for amplifying the second electrical signal transmitted by the optical detector and then transmitting the amplified second electrical signal to the network device for compensation processing.
It should be noted that, with the increasing bandwidth of the optical module, the coding format of the electrical signal in the optical module is improved from Non-Return-to-Zero (NRZ) to Pulse Amplitude Modulation (PAM 4), and since PAM4 codes have 4 levels of logic, both the laser driver and the amplifier inside the optical module must have a linear output function.
Based on this, optionally, referring to fig. 2, the laser driver in the optical transmission assembly may include a linear laser driver, so as to ensure that the optical module can complete PAM4 encoded signal transmission, and improve the bandwidth of the optical module.
The laser driver is used for converting the received first electric signal into a driving signal so as to drive the laser to emit laser.
Further, the Amplifier in the optical receiving component may include a linear TIA (Trans-impedance Amplifier) to ensure that the optical module can complete PAM4 encoded signal transmission, and improve the bandwidth of the optical module.
Wherein, the linear TIA is used for processing the second electric signal transmitted from the optical detector into a second electric signal with certain amplitude.
It can be understood that the amplifier in the optical receiving component may further include a limiting amplifier in addition to the linear TIA, so as to limit the second electrical signal processed by the linear TIA into a second electrical signal with a constant amplitude, and ensure the stability of the electrical signal.
In some embodiments, with continued reference to fig. 2, the photo-detector in the light receiving assembly may include a PIN (photo-diode) array to ensure that the optical module can achieve medium-short distance data transmission.
Further, the optical detector may also include an APD (Avalanche Photo Diode) array to ensure that the optical module can realize long-distance data transmission.
Of course, whether the photodetector employs a PIN array or an APD array, the longest supported transmission distance of the optical module is about 100 meters.
In some embodiments, with continued reference to fig. 2, the Laser in the light Emitting assembly may specifically be a VCSEL (Vertical Cavity Surface Emitting Laser).
It is understood that the Laser may be a DML (direct Modulated Laser) or an EML (External Modulated Laser) in addition to the VCSEL shown in fig. 2, and the specific type of the Laser is not particularly limited in this application.
Based on the embodiment shown in fig. 1, the present application further provides another optical module, specifically referring to fig. 3, the light emitting assembly includes a laser driver and a laser, and does not include a signal compensation device, and the light receiving assembly includes a photodetector and an amplifier, and further includes a signal compensation circuit connected to the amplifier, and is configured to perform compensation processing on the second electrical signal amplified by the amplifier, so that power consumption of the optical module is reduced to a certain extent, and quality of the electrical signal received by the network device is also ensured to meet requirements.
The compensation process of the signal compensation circuit may include any one or more of clock recovery, amplification and equalization.
In some embodiments, referring to fig. 4, the signal compensation circuit in the optical receiving module may include a CDR (Clock and Data Recovery) chip. The CDR chip is configured to perform clock recovery on the second electrical signal, specifically, extract a clock signal from the second electrical signal, find out a phase relationship between the clock signal and data, and compensate for a loss of the second electrical signal in the trace and the connector.
In some embodiments, referring to fig. 5, the signal compensation circuit in the light receiving module may also include a DSP (Digital signal processor) chip. Because the processing capability of the DSP chip is relatively strong, the DSP chip can achieve various processing requirements of the electrical signal, such as clock recovery, amplification, equalization, and the like, all of which can be achieved on the DSP chip.
Based on the above-mentioned optical module embodiment, the present application further provides an embodiment of an optical communication system.
Fig. 6 is a schematic structural diagram of an optical communication system according to an exemplary embodiment shown in this application, and as shown in fig. 6, the optical communication system includes an optical fiber and a network device in addition to the optical module shown in fig. 1 or fig. 3.
Specifically, the optical module is connected to the network device and the optical fiber, respectively, to implement interconnection between the network devices.
The data transmission principle is as follows: the network equipment on one side converts electrical signal data to be transmitted into optical signals through the optical module on the side, the optical signals are transmitted to the optical module of the network equipment on the opposite side through the optical fiber, and the optical module on the opposite side converts the optical signals into corresponding electrical signals and then transmits the electrical signals to the corresponding network equipment, so that data transmission is completed.
It should be noted that, after the optical module converts the optical signal into the electrical signal, the electrical signal needs to be transmitted to the network device, and a connection route between the optical module and the network device also has signal loss, so that a connection scheme design between the optical module and the network device needs to be considered, and two specific connection schemes are given below:
in a first connection scheme, as shown in fig. 7, an electrical interface for transmitting electrical signals and an optical interface for transmitting optical signals are provided on an optical module, so that the optical module is connected to a network device through the electrical interface, and the optical module is connected to an optical fiber through the optical interface.
The optical module is designed to be pluggable, when the network equipment is plugged in, an electrical interface on the optical module is in butt joint with a port reserved in a mainboard of the network equipment, and after the network equipment is pulled out, the optical module can be used on other network equipment, so that the optical module is convenient to maintain and use.
In a possible implementation manner, because the pluggable optical module is connected to a port reserved on a motherboard of the network device, and a PCB (Printed Circuit Board) with a certain distance still exists on the motherboard for routing, the connection scheme shown in fig. 7 may use the optical module structure shown in fig. 3, and perform compensation processing on an electrical signal once through a signal compensation Circuit in the optical receiving component, and perform compensation processing once again when transmitting the electrical signal to a processor of the network device, thereby meeting the signal quality requirement.
In the second connection scheme, the electrical signals transmitted by the optical module to the network device are finally processed on a processor of the network device, and in order to further reduce the signal loss on the connection line, the optical module scheme is integrated on a mainboard of the network device so as to reduce the distance between the optical module and the processor as much as possible.
In specific implementation, referring to fig. 8, the network device includes a processor, the laser driver and the amplifier in the optical module are both directly connected to the processor, and the laser and the optical detector in the optical module are both connected to the optical fiber.
The optical module circuit is directly integrated on the mainboard inside the network equipment, so that the distance between the optical module and the processor is shortened as much as possible, and lossless transmission of electric signals between the optical module and the processor is ensured. And an optical interface is reserved on a mainboard of the network equipment so as to connect a laser and an optical detector in the optical module with the optical fiber.
In a possible implementation manner, since the optical module circuit is directly integrated on the network device motherboard, the switch chip can be directly connected to the laser driver and the amplifier of the optical module, and the long-distance PCB routing is omitted, the connection scheme shown in fig. 8 can use the optical module structure shown in fig. 1 to completely implement the compensation processing of the signal by the processor of the network device, so as to reduce the power consumption of the optical module to the maximum extent.
It should be noted that the network device may be a switch, and the processor on the switch is a switch chip.
It should be further noted that, with the development of integrated circuit technology, the optical module circuit and the processor of the network device may also be packaged as a chip.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises that element.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (10)
1. A light module, comprising:
a light emitting assembly comprising a laser driver and a laser, the laser driver for driving the laser to emit a light signal in accordance with a received first electrical signal;
the optical receiving component comprises an optical detector and an amplifier, and the optical detector is used for converting a received optical signal into a second electric signal and then transmitting the second electric signal to the amplifier for amplification;
wherein the light emitting component and/or the light receiving component do not include a signal compensation circuit.
2. The optical module of claim 1, wherein the optical receiving module further comprises a signal compensation circuit connected to the amplifier for performing compensation processing on the amplified second electrical signal.
3. The optical module of claim 2, wherein the signal compensation circuit comprises a Clock Data Recovery (CDR) chip.
4. The optical module of claim 2, wherein the signal compensation circuit comprises a Digital Signal Processor (DSP) chip.
5. The optical module of claim 1, wherein the optical module is configured to connect with an external network device;
and the amplifier is used for amplifying the second electric signal and then transmitting the second electric signal to the network equipment for compensation processing.
6. The optical module of claim 1, wherein the amplifier comprises a linear transimpedance amplifier (TIA).
7. The light module of claim 1, wherein the laser driver comprises a linear laser driver.
8. An optical communication system, characterized in that the system comprises an optical fiber, a network device and a light module according to any of the claims 1-7;
wherein the optical module is connected to the network device and the optical fiber, respectively.
9. The system according to claim 8, wherein an electrical interface for transmitting electrical signals and an optical interface for transmitting optical signals are provided on the optical module;
the optical module is connected with the network equipment through the electrical interface, and the optical module is connected with the optical fiber through the optical interface.
10. The system of claim 8, wherein the network device comprises a processor;
a laser driver and an amplifier in the optical module are both connected with the processor;
and the laser and the optical detector in the optical module are both connected with the optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211152359.1A CN115664527A (en) | 2022-09-21 | 2022-09-21 | Optical module and optical communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211152359.1A CN115664527A (en) | 2022-09-21 | 2022-09-21 | Optical module and optical communication system |
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| Publication Number | Publication Date |
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| CN115664527A true CN115664527A (en) | 2023-01-31 |
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| CN202211152359.1A Pending CN115664527A (en) | 2022-09-21 | 2022-09-21 | Optical module and optical communication system |
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- 2022-09-21 CN CN202211152359.1A patent/CN115664527A/en active Pending
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