WO2020042492A1 - Module d'émission-réception optique bidirectionnel basé sur une technologie de modulation pam4 - Google Patents

Module d'émission-réception optique bidirectionnel basé sur une technologie de modulation pam4 Download PDF

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Publication number
WO2020042492A1
WO2020042492A1 PCT/CN2018/123698 CN2018123698W WO2020042492A1 WO 2020042492 A1 WO2020042492 A1 WO 2020042492A1 CN 2018123698 W CN2018123698 W CN 2018123698W WO 2020042492 A1 WO2020042492 A1 WO 2020042492A1
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WIPO (PCT)
Prior art keywords
pam4
signal
nrz
transceiver module
bosa
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PCT/CN2018/123698
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English (en)
Chinese (zh)
Inventor
林韬
陈晋敏
陈春山
张武平
刘成刚
徐红春
宋小平
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Accelink Technologies Co Ltd
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Accelink Technologies Co Ltd
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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
    • H04B10/40—Transceivers
    • 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
    • H04B10/25758—Optical arrangements for wireless networks between a central unit and a single remote unit by means of an optical fibre
    • 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
    • H04B10/2589—Bidirectional transmission
    • 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
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/69—Electrical arrangements in the receiver
    • H04B10/691—Arrangements for optimizing the photodetector in the receiver

Definitions

  • Embodiments of the present invention relate to the field of optical communication and optoelectronic devices, and in particular, to a bidirectional optical transceiver module based on PAM4 modulation technology.
  • an embodiment of the present invention provides a bidirectional optical transceiver module based on the PAM4 modulation technology.
  • An embodiment of the present invention provides a bidirectional optical transceiver module based on PAM4 modulation technology, including: a PAM4 DSP unit, a driving circuit, and a single-fiber bidirectional optical transceiver component BOSA;
  • the PAM4 DSP unit is used for accessing an NRZ-coded electrical signal of an external device, converting the NRZ-coded electrical signal into a PAM4-encoded electrical signal, and outputting the PAM4-encoded electrical signal to an NRZ-encoded electrical signal. And output to external equipment;
  • the driving circuit is configured to amplify the PAM4 electrical signal output by the PAM4 DSP unit and output it to BOSA;
  • the BOSA is used for outputting the PAM4 electrical signal through a single interface optical fiber after electro-optical conversion, or photoelectrically converting the optical signal received by the single interface optical fiber to the PAM4 DSP unit, so as to achieve single fiber bidirectional Optical transceiver function.
  • the BOSA internally integrates a WDM filter, a photodetection unit PD, and a TIA transimpedance amplifier unit;
  • the BOSA After the BOSA receives the optical signal through the single interface fiber, it is reflected by the WDM filter to the photoelectric detection unit PD, the optical signal is converted into a current signal by the photoelectric detection unit PD, and the current signal is converted by a TIA transimpedance amplifier unit. The voltage signal is output to the PAM4 DSP unit.
  • the BOSA includes a directly modulated semiconductor laser DML or an electro-absorption modulation laser EML;
  • the PAM4 electrical signal is modulated into a light signal output of 1270nm or 1330nm through the directly modulated semiconductor laser DML; correspondingly, the photodetection unit PD at the receiving end in BOSA is a PIN photodiode;
  • the electrical absorption modulation laser EML modulates the PAM4 electrical signal into an optical signal output of 1295nm or 1309nm; correspondingly, the photodetection unit PD at the receiving end in BOSA is an APD avalanche photodiode.
  • the NRZ coded electrical signal accessed by the PAM4 DSP unit is a 2 * 25G NRZ signal
  • the bidirectional optical transceiver module converts two 25G NRZ signals into one 25G PAM4 signal and outputs the signal through a single interface fiber;
  • the two-way optical transceiver module converts one 25G PAM4 received into two 25G NRZ signals and outputs them to an external device.
  • the NRZ coded electrical signal accessed by the PAM4 DSP unit is a 2 * 50G NRZ signal
  • the bidirectional optical transceiver module converts two 50G NRZ signals into one 50G PAM4 signal and outputs the signal through a single interface fiber;
  • the bi-directional optical transceiver module converts the received 50G PAM4 into 2 50G NRZ signals and outputs them to an external device.
  • the NRZ coded electrical signal accessed by the PAM4 DSP unit is a 4 * 25G NRZ signal;
  • the driving circuit includes a first driving circuit and a second driving circuit;
  • the single-fiber bidirectional optical transceiver component BOSA includes a first BOSA and Second BOSA;
  • the bidirectional optical transceiver module converts four 25G NRZ signals into two 25G PAM4 signals and outputs the signals through the first interface fiber and the second interface fiber, respectively;
  • the two-way optical transceiver module converts two 25G PAM4 received by the first interface fiber and the second interface fiber into four 25G NRZ signals and outputs the signals to an external device.
  • the bidirectional optical transceiver module is packaged with QSFP28.
  • the bidirectional optical transceiver module based on the PAM4 modulation technology provided by the embodiment of the present invention realizes the mutual conversion between the NRZ encoding and the PAM4 encoding through the PAM4 DSP unit, the single fiber optical transmission and reception through BOSA, and the completion of the photoelectric-electric-optical conversion, which can realize 25G optical devices transmit 50Gbps or 100bps rates, or 50G optical devices transmit 100Gbps rates, which reduces the requirements for optical devices.
  • the transmission distance can reach 10km to 40km, which can meet the needs of 5G bearers.
  • FIG. 1 is a principle block diagram of a bidirectional optical transceiver module based on a PAM4 modulation technology according to an embodiment of the present invention
  • FIG. 2 is a schematic block diagram of a bidirectional optical transceiver module based on a PAM4 modulation technology according to another embodiment of the present invention
  • FIG. 3 is a schematic block diagram of a bidirectional optical transceiver module based on a PAM4 modulation technology according to another embodiment of the present invention.
  • FIG. 4 is a schematic block diagram of a 40km transmission system according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a measured bit error rate curve of a bidirectional optical transceiver module in a 1295 / 1309nm wavelength solution in a 40km scenario according to an embodiment of the present invention.
  • the second driving circuit 104-1.
  • the first interface fiber The first interface fiber.
  • FIG. 1 is a principle block diagram of a bidirectional optical transceiver module based on the PAM4 modulation technology according to an embodiment of the present invention.
  • the bidirectional optical transceiver module based on the PAM4 modulation technology shown in FIG. 1 is characterized in that it includes: a PAM4 DSP unit 102 and a driving circuit 103 And single-fiber bidirectional optical transceiver module BOSA104;
  • the PAM4 DSP unit 102 is configured to access an NRZ-encoded electrical signal of an external device, convert the NRZ-encoded electrical signal into a PAM4-encoded electrical signal, and output the PAM4-encoded electrical signal to a driving circuit 103, or convert the PAM4-encoded electrical signal to an NRZ code. Electrical signal and output to external equipment;
  • the PAM4 DSP unit 102 is configured to implement mutual conversion between the NRZ code and the PAM4 number, and output the converted coded signal to the NRZ electrical interface unit 101 or the driving circuit 103;
  • the driving circuit 103 is configured to amplify and output the PAM4 electrical signal output from the PAM4 DSP unit 102 to the BOSA104;
  • the BOSA104 is configured to perform electrical-optical conversion of the PAM4 electrical signal and output it through a single interface optical fiber, or perform optical-to-electrical conversion on the optical signal received by the single interface optical fiber and send it to the PAM4 DSP unit 102, thereby realizing a single fiber.
  • Two-way optical transceiver function Two-way optical transceiver function.
  • the bidirectional optical transceiver module is externally connected with an NRZ electrical interface unit 101, and the NRZ electrical interface unit 101 does not belong to the bidirectional optical transceiver module in the embodiment of the present invention.
  • the bidirectional optical transceiver module in FIG. 1, FIG. 2, FIG. 3, and FIG. 4 is externally connected with the NRZ electrical interface unit 101, but does not represent the NRZ electrical interface unit.
  • 101 is an integrated component of the bidirectional optical transceiver module according to the embodiment of the present invention.
  • the NRZ electrical interface unit 101 itself does not belong to the bidirectional optical transceiver module of the embodiment of the present invention, and details are not described herein again.
  • the NRZ electrical interface unit 101 may implement the connection between the bidirectional optical transceiver module and a system backplane.
  • the PAM4 DSP unit 102 can convert the NRZ encoding to the PAM4 encoding, or convert the PAM4 encoding to the NRZ encoding to realize bidirectional encoding output.
  • the driving circuit 103 is a linear driving chip, which can amplify the differential electrical signal output from the DSP chip of the PAM4 DSP unit 102 and is used to drive the laser of the BOSA104.
  • the bidirectional optical transceiver module according to the embodiment of the present invention is implemented on a printed circuit board, and is packaged with QSFP28, which has a small volume and a high degree of integration.
  • the bidirectional optical transceiver module based on the PAM4 modulation technology provided by the embodiment of the present invention realizes the mutual conversion between the NRZ encoding and the PAM4 encoding through the PAM4 DSP unit, the single fiber optical transmission and reception through BOSA, and the photoelectric-electric-optical conversion is completed; Transceiver function, used as a transmitting module at the transmitting end and as a receiving module at the receiving end; capable of transmitting 25Gbps optical devices at a rate of 50Gbps or 100bps, or 50G optical devices transmitting at a rate of 100Gbps, which reduces the requirements for optical devices and the transmission distance can reach 10km to 40km, which can meet the needs of 5G bearer.
  • the BOSA internally integrates a WDM filter, a photodetection unit PD, and a TIA transimpedance amplifier unit.
  • the WDM filter, the photodetection unit PD, and a TIA transimpedance amplifier unit are used to implement the Reception of optical signals, photoelectric conversion, etc.
  • the BOSA receives the optical signal through the single interface fiber, it is reflected by the WDM filter to the photoelectric detection unit PD, and the optical signal is converted into a current signal by the photoelectric detection unit PD.
  • the current signal is converted into a voltage signal and output to the PAM4 DSP unit.
  • the BOSA includes a directly modulated semiconductor laser DML or an electro-absorption modulation laser EML;
  • the PAM4 electrical signal is modulated to an optical signal output of 1270nm or 1330nm through the directly modulated semiconductor laser DML; correspondingly, the photodetection unit PD at the receiving end in BOSA is a PIN photodiode;
  • the electrical absorption modulation laser EML is used to modulate the PAM4 electrical signal to an optical signal output of 1295nm or 1309nm.
  • the photodetection unit PD at the receiving end in BOSA is an APD avalanche photodiode.
  • the bidirectional optical transceiver module according to the embodiment of the present invention can realize optical signal transmission of 10km or 40km.
  • the BOSA of the bidirectional optical transceiver module uses a directly modulated semiconductor laser DML, and the photodetection unit PD in the receiving BOSA is a PIN photodiode.
  • the PAM4 electrical signal is modulated into a 1270nm optical signal output through DML, and at the same time, the 1330nm optical signal emitted by the second end is received; at the second end, the PAM4 electrical signal is modulated into a 1330nm optical signal output through the DML , While receiving the 1270nm optical signal emitted by the first end.
  • the BOSA of the bidirectional optical transceiver module uses an electro-absorption modulation laser EML, and the photodetection unit PD used is an APD avalanche photodiode.
  • a wavelength scheme of 1295 / 1309nm is used.
  • the PAM4 electrical signal is modulated to an optical signal of 1295 nm through the EML, and at the same time, the 1309 nm optical signal emitted by the second end is received; at the second end, the PAM4 electrical signal is modulated to the 1309 nm optical signal by the EML.
  • the 1295nm optical signal emitted by the first end While receiving the 1295nm optical signal emitted by the first end.
  • the prescribed limit of the dispersion curve parameter as a function of wavelength in the 1310nm region can be obtained according to the following equations (1) and (2), where S 0max is the maximum zero dispersion slope, ⁇ 0max is the maximum zero dispersion wavelength, and ⁇ 0min is the minimum Zero dispersion wavelength:
  • the corresponding dispersion cost range is about (-0.73, 0.45) db. If the commonly used wavelength of 1270 / 1330nm is selected as the transmission carrier, the calculation result is as follows:
  • the corresponding dispersion cost range is about (-0.88, 1.75) db. Comparing Table 1 and Table 2 clearly shows that the dispersion cost of the 1295 / 1309nm wavelength used in the ER scene is significantly better than 1270 / 1330nm.
  • FIG. 5 is a schematic diagram of a measured bit error rate curve of a bidirectional optical transceiver module in a 1295 / 1309nm wavelength solution in a 40km scenario according to an embodiment of the present invention.
  • the results show that the module's bit error rate can meet the KP4FEC requirements in the entire temperature range, and can meet the requirements of the 5G bearer network. Application requirements.
  • dispersion will cause pulse broadening in optical transmission, and bit error rate will affect data transmission accuracy and cause signal distortion.
  • the 1295 / 1309nm wavelength can effectively reduce the dispersion cost and bit error rate, and achieve stable transmission of 40km.
  • the NRZ coded electrical signal accessed by the PAM4 DSP unit is a 2 * 25G NRZ signal
  • the bidirectional optical transceiver module converts two 25G NRZ signals into one 25G PAM4 signal and outputs the signal through a single interface fiber;
  • the two-way optical transceiver module converts one 25G PAM4 received into two 25G NRZ signals and outputs them to an external device.
  • a 50G bidirectional optical transceiver module based on PAM4 modulation technology.
  • the module includes a PAM4 DSP unit 102, a driving circuit 103, and a single-fiber bidirectional optical module BOSA104 (including a WDM filter 105).
  • the transceiver module is externally connected with a 2 ⁇ 25G NRZ electrical interface unit 101.
  • the system board 2 ⁇ 25G NRZ electrical interface unit 101 sends a 50 Gbps high-speed signal to the PAM4 DSP unit 102, where the high-speed signal is a 2 channel 25G differential signal and the coding form is an NRZ pattern; 2 channels of 25G NRZ differential signal Input to the PAM4 DSP unit 102, the PAM4 DSP unit 102 performs code coding on the electrical signals, compiles the NRZ code into a PAM code, and outputs a 25GBaud PAM4 electric signal to the drive circuit 103.
  • the driving circuit amplifies the PAM4 differential signal output from the PAM4 DSP unit and outputs it to the single-fiber bidirectional optical module BOSA to drive the laser.
  • the laser in the single-fiber bidirectional optical module converts the 25GBaud PAM4 electrical signal into an optical signal output at a rate of 50Gbps.
  • the light signal When receiving, the light signal enters the single-fiber receiving and emitting module 104, is reflected by the WDM filter 105, and passes through the PD unit in the single-fiber receiving and emitting module.
  • the optical signal is converted into a current signal, and then the current signal is converted into a voltage signal by the TIA transimpedance amplifier unit.
  • the electrical signal is a 25Gbaud high-speed signal, and the code pattern is a PAM4 code pattern; the DSP unit in the PAM4 DSP unit 102 compiles the signal pattern, and compiles one 25GBaud PAM4 code electrical signal into two 25GBaud NRZ The coded electrical signal is output to the 2 ⁇ 25G NRZ electrical interface unit 101, which completes single-fiber bidirectional 50Gbps optical communication transmission.
  • the embodiment of the present invention uses a 25G optical device to transmit a 50 Gbps rate, uses a BOSA single-fiber bidirectional optical component, and uses WDM technology to couple the signals in the transmitting and receiving directions into a single optical fiber for transmission, thereby improving fiber utilization.
  • FIG. 2 is a schematic block diagram of a bidirectional optical transceiver module based on PAM4 modulation technology according to another embodiment of the present invention; based on the above embodiments, the NRZ-coded electrical signal accessed by the PAM4 DSP unit is a 2 * 50G NRZ signal;
  • the bidirectional optical transceiver module converts two 50G NRZ signals into one 50G PAM4 signal and outputs the signal through a single interface fiber;
  • the bi-directional optical transceiver module converts the received 50G PAM4 into 2 50G NRZ signals and outputs them to an external device.
  • a 100G bidirectional optical transceiver module based on PAM4 modulation technology.
  • the module includes a PAM4 DSP unit 102, a driving circuit 103, and a single-fiber bidirectional optical module BOSA104 (including a WDM filter 105).
  • the transceiver module is externally connected with a 2 ⁇ 50G NRZ electrical interface unit 101.
  • the 2 ⁇ 50G NRZ electrical interface unit 101 sends a 100 Gbps high-speed signal to the PAM4 DSP 102, and the coding form is an NRZ code pattern.
  • the PAM4 DSP 102 converts two 50G NRZ pattern signals into one 50GBaud PAM4 pattern signal.
  • the electrical signal is waveform-shaped and amplified by the drive circuit 103.
  • the signal is output to a single-fiber bidirectional optical module 104 to drive its laser to achieve a single fiber.
  • WDM filter 105 receives the received optical signal during reception, and converts it into a 50GBaud PAM4 electrical signal through a single-fiber bidirectional optical component 104 such as PD / TIA, and then transmits it to PAM4 DSP, and the DSP sends 1 50GBaud PAM4 signal It is converted into two 50G NRZ code signals and output to the 2 ⁇ 50G NRZ electrical interface unit to complete single fiber 100G optical signal reception.
  • a single-fiber bidirectional optical component 104 such as PD / TIA
  • the embodiment of the present invention uses a 50G optical device to transmit a 100 Gbps rate, uses a BOSA single-fiber bidirectional optical component, and uses WDM technology to couple signals in the transmitting and receiving directions into one optical fiber for transmission, thereby improving fiber utilization.
  • FIG. 3 is a schematic block diagram of a bidirectional optical transceiver module based on PAM4 modulation technology according to another embodiment of the present invention.
  • the NRZ coded electrical signal accessed by the PAM4 DSP unit is a 4 * 25G NRZ signal;
  • the driving circuit Including a first driving circuit and a second driving circuit;
  • the single-fiber bidirectional optical transceiver module BOSA includes a first BOSA and a second BOSA;
  • the bidirectional optical transceiver module converts four 25G NRZ signals into two 25G PAM4 signals and outputs the signals through the first interface fiber and the second interface fiber, respectively;
  • the two-way optical transceiver module converts two 25G PAM4 received by the first interface fiber and the second interface fiber into four 25G NRZ signals and outputs the signals to an external device.
  • the optical module includes a PAM4 DSP unit 102 and two driving circuits, namely a first driving circuit 103-1 and a second driving circuit 103- 2.
  • Two single-fiber bidirectional optical components, BOSA are the first BOSA104-1 and the second BOSA104-2 (containing WDM filters 105-1 and 105-2, respectively).
  • the bidirectional optical transceiver module is externally connected with 4 ⁇ 25G NRZ electrical interface unit 101, in which the driving circuit 103-1, BOSA104-1 and its internal WDM filter 105-1 are a set of transceiver components, corresponding to the first interface fiber 106-1; the driving circuit 103-2, BOSA104 -2 and its connotation WDM filter 105-2 is another set of transceiver components, corresponding to the second interface fiber 106-2; both sets of transceiver components perform signal interaction with the PAM4 DSP unit 102.
  • the 4 ⁇ 25G NRZ electrical interface unit 101 sends a 100Gbps high-speed signal to the PAM4 DSP unit 102 of the optical module, and the coding form is an NRZ pattern; the 4 ⁇ 25G NRZ signal is input to the PAM4 DSP unit 102, and its internal DSP processes The unit compiles the electrical signals into code patterns, and compiles four 25G NRZ code electrical signals into two 25GBaud PAM code electrical signals.
  • One 25GBaud PAM code electrical signal is output to the first drive circuit 103-1, and the other 25GBaud PAM code electrical
  • the signal is output to the second driving circuit 103-2; the driving circuit shapes and amplifies the amplitude of the electrical signal, and outputs it to the corresponding first BOSA104-1 and the second BOSA104-2 to drive the laser, and then the two 25GBaud PAM4
  • the electrical signals are converted into optical signals and output through the first interface optical fiber 106-1 and the second interface optical fiber 106-2, with a total rate of 100 Gbps.
  • the 100Gbps optical signal When receiving, the 100Gbps optical signal enters BOSA104-1 and BOSA104-2 in two ways, and is reflected by the corresponding WDM filter and passed through the PD unit in the single-fiber receiving and emitting module.
  • the optical signal is converted into a current signal, and then passes through the TIA transimpedance amplifier unit.
  • the current signal is converted into a voltage signal and output to the PAM4 DSP unit 102, where each electrical signal is a 2 ⁇ 25GBaud PAM4 pattern; the PAM4 DSP unit 102 compiles the signal pattern and compiles the 2 ⁇ 25GBaud PAM4 pattern into 4 ⁇ 25G NRZ pattern, output to 4 ⁇ 25G NRZ electrical interface unit 101 to complete 100G optical communication transmission.
  • a dual-channel PAM4 pattern is converted into a four-channel NRZ pattern module through a PAM4 DSP unit to complete a single-module 100G optical transmission, and a 100Gbps rate is transmitted through a 25G optical device.
  • FIG. 4 is a schematic block diagram of a 40km transmission system according to an embodiment of the present invention. Please refer to FIG. 4.
  • the same two-way optical transceiver module is configured at both ends of a 40km communication system.
  • the configuration of each end is a PAM4 DSP unit, a driving circuit and a BOSA.
  • the two-way optical transceiver modules are externally connected with 2 * 25G NRZ electrical interface units.
  • the BOSA module of the embodiment of the present invention adopts a wavelength scheme of 1295 / 1309nm, and can achieve stable transmission of 40km.
  • the bi-directional optical transceiver module based on the PAM4 modulation technology provided by the embodiment of the present invention can realize the transmission speed of 50Gbps or 100Gbps for 25G optical devices and the transmission speed of 100Gbps for 50G optical devices.
  • 1270 / 1330nm is used.
  • the 1295 / 1309nm wavelength scheme can be used to achieve stable transmission at 40km, which has good beneficial effects.

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

Abstract

Les modes de réalisation de la présente invention concernent un module d'émission-réception optique bidirectionnel basé sur une technologie de modulation PAM4, le module d'émission-réception optique bidirectionnel comprenant : une unité DSP PAM4, un circuit d'attaque et un sous-ensemble optique bidirectionnel à fibre unique (BOSA), l'unité DSP PAM4 étant utilisée pour recevoir un signal électrique de codage NRZ d'un dispositif externe, convertir le signal électrique de codage NRZ en un signal électrique de codage PAM4, et émettre celui-ci vers le circuit d'attaque, ou convertir un signal électrique de codage PAM4 en un signal électrique de codage NRZ, et émettre celui-ci vers le dispositif externe; le circuit d'attaque est utilisé pour amplifier le signal électrique PAM4 émis par l'unité DSP PAM4, et ensuite émettre le signal amplifié vers le BOSA; et le BOSA est utilisé pour mettre en œuvre une conversion électro-optique sur le signal électrique PAM4, et émettre ensuite celui-ci par l'intermédiaire d'une seule fibre optique d'interface, ou mettre en œuvre une conversion photoélectrique sur un signal optique reçu par la seule fibre optique d'interface, et ensuite envoyer celui-ci à l'unité DSP PAM4, de façon à satisfaire des besoins de support 5G.
PCT/CN2018/123698 2018-08-28 2018-12-26 Module d'émission-réception optique bidirectionnel basé sur une technologie de modulation pam4 Ceased WO2020042492A1 (fr)

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CN201810990832.0A CN109412696A (zh) 2018-08-28 2018-08-28 基于pam4调制技术的双向光收发模块

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CN114285476A (zh) * 2021-11-24 2022-04-05 武汉永鼎光通科技有限公司 一种单通道波分光模块
CN113965268B (zh) * 2021-11-29 2025-03-04 桂林聚联科技有限公司 一种时频信号的传输装置、系统及方法
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