CN115347974B - Multi-wavelength single-fiber bidirectional 400G long-distance optical communication system - Google Patents
Multi-wavelength single-fiber bidirectional 400G long-distance optical communication system Download PDFInfo
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- 230000003287 optical effect Effects 0.000 title claims abstract description 164
- 238000004891 communication Methods 0.000 title claims abstract description 51
- 239000000835 fiber Substances 0.000 title claims abstract description 40
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 20
- 230000005540 biological transmission Effects 0.000 claims abstract description 24
- 229910000577 Silicon-germanium Inorganic materials 0.000 claims description 19
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 claims description 19
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 239000013307 optical fiber Substances 0.000 abstract description 8
- 239000006185 dispersion Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000005679 Peltier effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000012805 post-processing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0215—Architecture aspects
- H04J14/0216—Bidirectional architectures
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Abstract
The application relates to the technical field of communication and provides a multi-wavelength single-fiber bidirectional 400G long-distance optical communication system, which comprises two terminal devices connected through a single fiber; the terminal equipment is at least provided with four optical modules, a wavelength division multiplexer and a demultiplexer, wherein the optical signal transmitting ends of the optical modules are all connected with the wavelength division multiplexer, and the optical signal receiving ends of the optical modules are all connected with the demultiplexer; the center wavelengths of the single-wavelength lasers generated by the optical modules in the two terminal devices are different, and the center wavelengths of the single-wavelength lasers generated by the optical modules in the two terminal devices are arranged at intervals. According to the multi-wavelength single-fiber bidirectional 400G long-distance optical communication system, the terminal equipment which is connected with each other is arranged at two communication nodes, the optical modules which are arranged among four wavelengths are arranged in the terminal equipment, and the optical modules can realize high-speed and long-distance transmission, so that 20KM multi-wavelength single-fiber bidirectional optical communication is realized under the condition that the existing optical fiber communication line is not transformed.
Description
Technical Field
The application relates to the technical field of communication, in particular to a multi-wavelength single-fiber bidirectional 400G long-distance optical communication system.
Background
With the development of the internet and data centers, under the condition that the requirement on transmission bandwidth is higher and higher, an optical module is required to have a certain transmission rate and a certain transmission distance. However, the existing single-wavelength optical module has the defects of limited transmission rate, smaller intersymbol interference, smaller dispersion cost, and low requirement on wavelength, and when the transmission rate is required to be higher, for example, the LWDM4 optical module utilizes four-wavelength lasers to synthesize an optical signal with the transmission rate of 100G, thus four lasers and corresponding transceiver devices are required, and the cost is higher.
On this basis, when optical communication of multiple wavelengths is required, a plurality of LWDM4 optical modules are required to be provided, the number of devices is further increased, and more communication optical fibers are required to be arranged. Or a technical scheme of DWDM (Dense Wavelength Division Multiplexing, dense optical multiplexing) and EDFA (erbium-doped fiber amplifier) with longer distance is adopted to realize multi-wavelength optical communication, however, the technical scheme of DWDM and EDFA also needs to arrange more communication fibers, and because the existing optical communication system is finished with wiring and then carries out additional wiring engineering, the method is time-consuming and labor-consuming, and seriously affects the normal operation of the existing communication system.
Disclosure of Invention
In order to provide a communication system satisfying long-distance transmission of 20KM without modifying an existing optical fiber communication line, the present application provides a multi-wavelength single-fiber bidirectional 400G long-distance optical communication system.
A multi-wavelength single-fiber bidirectional 400G long-distance optical communication system comprises two terminal devices connected through a single fiber;
the terminal equipment is at least provided with four optical modules, a wavelength division multiplexer and a demultiplexer, wherein the optical signal transmitting ends of the four optical modules are all connected with the wavelength division multiplexer, and the optical signal receiving ends of the four optical modules are all connected with the demultiplexer;
the optical module comprises a digital signal processor, a transmitting end and a receiving end;
the emitting end comprises a modulator and a laser, the line emitting end of the digital signal processor is connected with the modulator, the modulator is connected with the laser and is used for converting the electric signal into an optical signal, and the laser is used for generating single-wavelength laser carrying the optical signal;
the receiving end comprises a silicon-germanium avalanche photodiode and a linear transconductance amplifier, wherein the silicon-germanium avalanche photodiode is used for receiving single-wavelength laser carrying optical signals and converting the optical signals into electric signals to be transmitted to the linear transconductance amplifier, and the linear transconductance amplifier is connected with a line receiving end of the digital signal processor;
the center wavelengths of the single-wavelength lasers generated by the optical modules in the two terminal devices are different, and the center wavelengths of the single-wavelength lasers generated by the optical modules in the two terminal devices are arranged at intervals.
Optionally, the modulator is an electroabsorption modulator or an MZ modulator, and a driver of the modulator modulates the baud rate higher than 50Gbaud.
Optionally, the number of optical modules in the terminal device is 4, and in two terminal devices, the central wavelength of the single-wavelength laser generated by one terminal device is 1297.8 nm, 1302.31 nm, 1306.85 nm and 1311.43 nm respectively;
the central wavelength of the single-wavelength laser generated by the other terminal equipment is 1295.56 nanometers, 1300.05 nanometers, 1304.58 nanometers and 1309.14 nanometers respectively, so that the single-fiber transmission distance reaches 20 kilometers.
Optionally, the silicon germanium avalanche photodiode has a reverse bias voltage of 12 to 24 volts.
Optionally, the digital signal processor further comprises a KP pattern forward error corrector.
Optionally, the digital signal processor further comprises a main receiver for acquiring an electrical signal.
Optionally, the digital signal processor further comprises a main transmitter for outputting an electrical signal.
Optionally, the optical module adopts an SFP-DD miniature package or a QSFP miniature package.
Optionally, the optical module further comprises a heat sink, and the heat sink and the integrated block of the digital signal processor are filled in the gap by adopting a heat conducting material.
Optionally, the heat sink is a copper or copper alloy heat sink.
According to the technical scheme, the multi-wavelength single-fiber bidirectional 400G long-distance optical communication system provided by the application comprises two terminal devices connected through single fibers; the terminal equipment is at least provided with four optical modules, a wavelength division multiplexer and a demultiplexer, wherein the optical signal transmitting ends of the optical modules are all connected with the wavelength division multiplexer, and the optical signal receiving ends of the optical modules are all connected with the demultiplexer; the optical module comprises a digital signal processor, a transmitting end and a receiving end; the emitting end comprises a modulator and a laser, the line emitting end of the digital signal processor is connected with the modulator, the modulator is connected with the laser and is used for converting the electric signal into an optical signal, and the laser is used for generating single-wavelength laser carrying the optical signal; the receiving end comprises a silicon-germanium avalanche photodiode and a linear transconductance amplifier, wherein the silicon-germanium avalanche photodiode is used for receiving single-wavelength laser carrying optical signals and converting the optical signals into electric signals to be transmitted to the linear transconductance amplifier, and the linear transconductance amplifier is connected with a line receiving end of the digital signal processor; the center wavelengths of the single-wavelength lasers generated by the optical modules in the two terminal devices are different, and the center wavelengths of the single-wavelength lasers generated by the optical modules in the two terminal devices are arranged at intervals.
According to the multi-wavelength single-fiber bidirectional 400G long-distance optical communication system, the terminal equipment which is connected with each other is arranged at two communication nodes, the optical modules which are arranged among four wavelengths are arranged in the terminal equipment, and the optical modules can realize high-speed and long-distance transmission, so that the multi-wavelength single-fiber bidirectional optical communication of 20KM is realized under the condition that the existing optical fiber communication line is not transformed.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic overall structure of an optical communication system according to an embodiment of the present application;
fig. 2 is a schematic diagram of an overall structure of an optical module provided in an embodiment of the present application;
fig. 3 is a schematic signal conversion diagram of an optical module according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the examples below do not represent all embodiments consistent with the present application. Merely examples of embodiments consistent with some aspects of the present application as detailed in the claims.
In order to provide a communication system satisfying long-distance transmission of 20KM without modifying an existing optical fiber communication line, as shown in fig. 1, the embodiment of the present application provides a multi-wavelength single-fiber bidirectional 400G long-distance optical communication system, which includes two terminal devices connected through a single fiber, where the two device terminals are respectively disposed at network nodes where communication connection needs to be established.
The terminal equipment is at least provided with four optical modules, a wavelength division multiplexer and a demultiplexer, wherein the optical signal transmitting ends of the optical modules are all connected with the wavelength division multiplexer, and the optical signal receiving ends of the optical modules are all connected with the demultiplexer.
In the two terminal devices, the wavelength division multiplexer of one terminal device is connected with the demultiplexer of the other device through a single fiber, so that communication connection is established between the two terminal devices, and in the practical application process, the communication connection is established between the two network nodes by adopting the system, so that the existing communication network can be used without setting a special optical fiber, and the transformation difficulty is low.
In order to ensure that the optical signal can be transmitted at a high rate and a long distance, for example, 20KM long-distance transmission is achieved for a 4×100G optical signal, as shown in fig. 3, an overall structure schematic diagram of an optical module provided in an embodiment of the present application is shown, where the optical module includes a digital signal processor, a transmitting end and a receiving end.
The emitting end comprises a modulator and a laser, the line emitting end of the digital signal processor is connected with the modulator, the modulator is connected with the laser and used for converting the electric signal into an optical signal, and the laser is used for generating single-wavelength laser carrying the optical signal.
The receiving end comprises a silicon-germanium avalanche photodiode and a linear transconductance amplifier, wherein the silicon-germanium avalanche photodiode is used for receiving single-wavelength laser carrying optical signals and converting the optical signals into electric signals to be transmitted to the linear transconductance amplifier, and the linear transconductance amplifier is connected with a line receiving end of the digital signal processor.
The center wavelengths of the single-wavelength lasers generated by the optical modules in the two terminal devices are different, and the center wavelengths of the single-wavelength lasers generated by the optical modules in the two terminal devices are arranged at intervals.
In the practical use process, through testing, the optical module provided by the embodiment of the application adopts single-wavelength laser with the wavelength of 1308.09 nanometers, the negative dispersion of 30km is-45.20532463 ps/nm, and the positive dispersion is 22.3625725ps/nm; and adopting single-wavelength laser with wavelength of 1310.19 nanometers, transmitting negative dispersion of-39.14337607 ps/nm for 30km, positive dispersion of 28.10014381ps/nm, and if the wavelength of the single-wavelength laser is 1308.09-1310.19 nanometers, the differential group delay is 8.83ps at maximum, the differential group delay cost is 0.75 db, and the dispersion cost is 1 db, so that the dispersion range of-45 ps/nm to 25ps/nm is satisfied. For a transmission distance of 20km, the central wavelength of the single-wavelength laser can be properly widened, and the central wavelength is widened to 1295.56-1311.43 nanometers through testing, so that the optical communication device still has higher transmission speed and transmission quality and can meet the optical communication requirement of a long distance of 20 km.
Specifically, in order to realize multi-wavelength single-fiber bidirectional transmission, the center wavelengths of the single-wavelength lasers generated by the optical modules in the two terminal devices are different from each other, and the center wavelengths of the single-wavelength lasers generated by the optical modules in the two terminal devices are arranged at intervals. For example, when 4 optical modules are set in one terminal device, in two terminal devices, the center wavelength of the single-wavelength laser generated by the first terminal device is 1297.8 nm, 1302.31 nm, 1306.85 nm and 1311.43 nm respectively; the center wavelengths of the corresponding second terminal equipment receiving ends are 1297.8 nm, 1302.31 nm, 1306.85 nm and 1311.43 nm, respectively.
And the center wavelength of the single-wavelength laser generated by the second terminal equipment is 1297.8 nanometers, 1302.31 nanometers, 1306.85 nanometers and 1311.43 nanometers respectively; the central wavelength of the receiving end of the corresponding first terminal device is 1297.8 nm, 1302.31 nm, 1306.85 nm and 1311.43 nm respectively, so as to realize a communication system with a wavelength of single fiber and a bidirectional 400G long distance, and ensure that the optical signal still has higher transmission quality after the single fiber transmission distance reaches 20km
Further, in some embodiments of the present application, the modulator is an electro-absorption modulator or a MZ (mach zehnder) modulator, and a driver of the modulator modulates the baud rate higher than 50Gbaud.
In the embodiment of the present application, in order to implement the multi-wavelength single-fiber bidirectional transmission technology, the transmission distance of the optical module is sacrificed to a certain extent, so that in the case where the transmission distance requirement is not particularly high, other optical modules may be considered to replace the optical module in the embodiment of the present application, so as to implement multi-wavelength single-fiber bidirectional optical communication, for example, a PAM4 optical module is adopted.
According to the optical module provided by the embodiment of the application, in the application process, a TEC chip (Thermo Electric Cooler, a semiconductor refrigerator) is preloaded and is used for refrigerating or heating a laser by utilizing the Peltier effect of the TEC, the optical module controls the current direction and the current magnitude of the TEC through an external circuit to stabilize the internal working temperature, the control circuit of the optical module considers the superiority of hardware analog PID, and selects two TEC control chips of self-correction and self-stabilization zero drift amplifiers, the TEC control chips have strong driving capability and high efficiency up to 90%, the wide temperature range of products is met, and proportional, differential and integral operations are realized by accurately configuring PID RC compensation network hardware according to the characteristics of the TEC in the optical module; the whole design scheme fully utilizes the absolute advantages of high hardware PID response speed and continuous (relative software PID discrete processing) processing of feedback signals, a module can always lock target temperature and control the temperature within +/-0.5 ℃ of the target temperature even in an environment with quite severe temperature change, the wavelength drift of a laser chip selected by the optical module in the scheme is about 0.08nm when the temperature is changed by 1 ℃, and an external circuit accurately controls the working temperature of the optical module to indirectly lock the wavelength of a product within +/-0.04 nm in a quite narrow range, so that the product still meets the dispersion requirement when the product is transmitted in a long distance.
In order to solve the problem that the dispersion cost exists in the process of transmitting an optical signal by an optical fiber, the higher the speed is, the farther the distance is, the higher the dispersion cost is, and the quality of the received optical signal is lower, in the embodiment of the application, the receiving end comprises a silicon germanium avalanche photodiode and a linear transconductance amplifier, the silicon germanium avalanche photodiode is used for receiving single-wavelength laser carrying the optical signal and converting the optical signal into an electric signal to be transmitted to the linear transconductance amplifier, and the linear transconductance amplifier is connected with a line receiving end of the digital signal processor to meet the requirement of high-speed long-distance transmission of the 4×100G optical signal.
Further, in some embodiments of the present application, the silicon germanium avalanche photodiode includes an optical coupler, an optical reflector, an optical waveguide, and an active region; the optical coupler is used for receiving the single-wavelength laser carrying the optical signal, and the optical reflector is arranged below the optical coupler; the optical waveguide is used for guiding the single-wavelength laser of the optical signal received by the optical coupler to an active area, and the active area is used for converting the optical signal into an electric signal. The silicon germanium avalanche photodiode has a reverse bias voltage of 12 to 24 volts. The voltage is far lower than that of the traditional silicon-germanium avalanche photodiode, and the power consumption can be greatly reduced. As shown in fig. 3, which is a schematic signal conversion diagram of an optical module provided in an embodiment of the present application, in some embodiments of the present application, the digital signal processor further includes a KP code type forward error corrector, a main receiver, and a main transmitter, where the main receiver is configured to obtain an electrical signal, and the main transmitter is configured to output the electrical signal.
In the practical application process, after the electrical signal received by the main receiver is processed by the KP code type forward error corrector, the electrical signal is amplified by the electroabsorption modulation laser driver, the laser is driven to convert the electrical signal into an optical signal, the optical signal is output for a long distance, the optical signal is received by another optical module, and the post-processing principle of the optical signal received by the other optical module is as follows: the optical signal is transmitted into the silicon-germanium avalanche photodiode, the silicon-germanium avalanche photodiode converts the optical signal into an electric signal, the electric signal is amplified by the linear transconductance amplifier and then transmitted into the digital signal processor, and after being processed by the KP code type forward error corrector, the electric signal is output by the main transmitter, for example, the electric signal is transmitted to a switch chip.
Further, in order to ensure that the optical module provided in the embodiments of the present application can meet the requirement of miniaturization, so as to adapt to the continuous increase of the device port density, in some embodiments of the present application, the optical module adopts an SFP-DD small package or a QSFP small package.
Furthermore, in the practical application process, the heat productivity of the digital signal processor may exceed 1.5 watts, so that in order to ensure the stable operation of the device, the optical module further includes a heat sink, the heat sink is a copper or copper alloy heat sink, and a gap is filled between the heat sink and the integrated block of the digital signal processor by using a heat conducting material.
As can be seen from the above technical solutions, the multi-wavelength single-fiber bidirectional 400G long-distance optical communication system provided in the embodiments of the present application includes two terminal devices connected through a single fiber; the terminal equipment is at least provided with four optical modules, a wavelength division multiplexer and a demultiplexer, wherein the optical signal transmitting ends of the optical modules are all connected with the wavelength division multiplexer, and the optical signal receiving ends of the optical modules are all connected with the demultiplexer; the optical module comprises a digital signal processor, a transmitting end and a receiving end; the emitting end comprises a modulator and a laser, the line emitting end of the digital signal processor is connected with the modulator, the modulator is connected with the laser and is used for converting the electric signal into an optical signal, and the laser is used for generating single-wavelength laser carrying the optical signal; the receiving end comprises a silicon-germanium avalanche photodiode and a linear transconductance amplifier, wherein the silicon-germanium avalanche photodiode is used for receiving single-wavelength laser carrying optical signals and converting the optical signals into electric signals to be transmitted to the linear transconductance amplifier, and the linear transconductance amplifier is connected with a line receiving end of the digital signal processor; the center wavelengths of the single-wavelength lasers generated by the optical modules in the two terminal devices are different, and the center wavelengths of the single-wavelength lasers generated by the optical modules in the two terminal devices are arranged at intervals.
According to the multi-wavelength single-fiber bidirectional 400G long-distance optical communication system, the terminal equipment which is connected with each other is arranged at two communication nodes, the optical modules which are arranged among four wavelengths are arranged in the terminal equipment, and the optical modules can realize high-speed and long-distance transmission, so that 20KM multi-wavelength single-fiber bidirectional optical communication is realized under the condition that the existing optical fiber communication line is not transformed.
The foregoing detailed description is merely illustrative of the general principles and/or exemplary embodiments of the present general inventive concept, and not necessarily in any way limiting of the scope of the invention. Various equivalent substitutions, modifications and improvements to the present application and its embodiments may be made by those skilled in the art without departing from the spirit and scope of the present application, and these fall within the scope of the present application. The scope of the application is defined by the appended claims.
Claims (9)
1. A multi-wavelength single-fiber bidirectional 400G long-distance optical communication system is characterized by comprising two terminal devices connected through a single fiber;
the terminal equipment is at least provided with four optical modules, a wavelength division multiplexer and a demultiplexer, wherein the optical signal transmitting ends of the optical modules are all connected with the wavelength division multiplexer, and the optical signal receiving ends of the optical modules are all connected with the demultiplexer;
the optical module comprises a digital signal processor, a transmitting end and a receiving end;
the emitting end comprises a modulator and a laser, the line emitting end of the digital signal processor is connected with the modulator, the modulator is connected with the laser and is used for converting an electric signal into an optical signal, and the laser is used for generating single-wavelength laser carrying the optical signal;
the receiving end comprises a silicon-germanium avalanche photodiode and a linear transconductance amplifier, wherein the silicon-germanium avalanche photodiode is used for receiving single-wavelength laser carrying optical signals and converting the optical signals into electric signals to be transmitted to the linear transconductance amplifier, and the linear transconductance amplifier is connected with a line receiving end of the digital signal processor;
the center wavelengths of the single-wavelength lasers generated by the optical modules in the two terminal devices are different, and the center wavelengths of the single-wavelength lasers generated by the optical modules in the two terminal devices are arranged at intervals;
the number of the optical modules in the terminal equipment is 4, and in the two terminal equipment, the central wavelength of single-wavelength laser generated by one terminal equipment is 1297.8 nanometers, 1302.31 nanometers, 1306.85 nanometers and 1311.43 nanometers respectively;
the central wavelength of the single-wavelength laser generated by the other terminal equipment is 1295.56 nanometers, 1300.05 nanometers, 1304.58 nanometers and 1309.14 nanometers respectively, so that the single-fiber transmission distance reaches 20 kilometers.
2. The multi-wavelength single-fiber bi-directional 400G long-distance optical communication system according to claim 1, wherein said modulator is an electro-absorption modulator or MZ modulator, and wherein the driver modulation baud rate of said modulator is higher than 50Gbaud.
3. A multi-wavelength single fiber bi-directional 400G long distance optical communication system according to any of claims 1-2 wherein said silicon germanium avalanche photodiode has a reverse bias voltage of 12 to 24 volts.
4. The multi-wavelength single-fiber bi-directional 400G long-range optical communication system of claim 1, wherein said digital signal processor further comprises a KP pattern forward error corrector.
5. The multi-wavelength single-fiber bi-directional 400G long-range optical communication system of claim 1, wherein said digital signal processor further comprises a main receiver for acquiring electrical signals.
6. The multi-wavelength single-fiber bi-directional 400G long-range optical communication system of claim 1, wherein said digital signal processor further comprises a main transmitter for outputting an electrical signal.
7. The multi-wavelength single-fiber bi-directional 400G long-range optical communication system of claim 1, wherein the optical module employs SFP-DD miniature package or QSFP miniature package.
8. The multi-wavelength single-fiber bi-directional 400G long-range optical communication system of claim 1, wherein the optical module further comprises a heat sink, and wherein the heat sink and the digital signal processor integrated block are filled with a thermally conductive material.
9. The multi-wavelength single-fiber bi-directional 400G long-range optical communication system of claim 8, wherein said heat sink is a copper or copper alloy heat sink.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412696A (en) * | 2018-08-28 | 2019-03-01 | 武汉光迅科技股份有限公司 | Bidirectional light receiving and transmitting module based on PAM4 modulation technique |
| CN109581597A (en) * | 2019-01-30 | 2019-04-05 | 宇捷光子科技(南京)有限公司 | A kind of Wave division multiplexing optical transmission system of simplex optical module composition |
| CN210839596U (en) * | 2019-12-26 | 2020-06-23 | 深圳市迅特通信技术有限公司 | Wavelength division multiplexing system and wavelength division multiplexing system for CWDM signal transmission |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20190173604A1 (en) * | 2017-12-04 | 2019-06-06 | Alibaba Group Holding Limited | High-speed optical transceiver based on cwdm and sdm |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412696A (en) * | 2018-08-28 | 2019-03-01 | 武汉光迅科技股份有限公司 | Bidirectional light receiving and transmitting module based on PAM4 modulation technique |
| CN109581597A (en) * | 2019-01-30 | 2019-04-05 | 宇捷光子科技(南京)有限公司 | A kind of Wave division multiplexing optical transmission system of simplex optical module composition |
| CN210839596U (en) * | 2019-12-26 | 2020-06-23 | 深圳市迅特通信技术有限公司 | Wavelength division multiplexing system and wavelength division multiplexing system for CWDM signal transmission |
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