DML-based high speed PAM4 light transceiver module

A technology of optical transceiver module and optical emission unit, applied in the field of optical modules, can solve the problems of high cost, high-frequency signal transmission loss, complex working principle, etc., and achieve the effect of low cost, small size and simple module structure

Inactive Publication Date: 2017-09-01
WUHAN TELECOMM DEVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The embodiment of the present invention is used to solve the problem of complex structure and high cost of the high-speed optical module adopting the traditional NRZ standard with the increase of the transmission rate; big problem
[0010] Further, the embodiment of the present invention is also used to solve the problem of high-frequency signal transmission loss caused by the sensitivity of the PAM4 standard signal to noise and transmission amplitude attenuation

Method used

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  • DML-based high speed PAM4 light transceiver module
  • DML-based high speed PAM4 light transceiver module
  • DML-based high speed PAM4 light transceiver module

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1 of the present invention provides a DML-based high-speed PAM4 optical transceiver module, such as figure 1 As shown, the optical transceiver module includes an interface unit 11, a PAM4 standard conversion unit 12, a DML optical transmitting unit 13 and an optical receiving unit 14:

[0054] The interface unit 11 is connected to the PAM4 system conversion unit 12, and is used to transmit the NRZ electrical signal of the first code rate transmitted through the interface unit 11 to the PAM4 system conversion unit 12;

[0055] The PAM4 system conversion unit 12 is also connected to the DML light transmitting unit 13 and the light receiving unit 14, for converting the NRZ electrical signal of the first code rate into an electrical signal of the first PAM4 modulation code format, and handing it over to the DML light transmitting unit 13, so that said DML light transmitting unit 13 transmits said PAM4 coded signal with laser signal; Wherein, the code rate of the ...

Embodiment 2

[0076] Based on the DML-based high-speed PAM4 optical transceiver module described in Embodiment 1, the embodiment of the present invention also provides a DML-based high-speed PAM4 optical transceiver module with an internal test function. Such as Figure 7 as shown,

[0077] The optical receiving unit 14 receives a 25Gbaud rate optical signal sent by an external optical network, and outputs a differential 50Gbps PAM4 electrical signal to the line-side receiving end of the PAM conversion unit 12 through photoelectric conversion and linear transimpedance amplification processing. The PAM conversion unit loops back the received electrical signal to the transmission end on the line side and sends it to the DML optical transmission unit 13 . The 25G linear driver of the DML optical transmitting unit 13 receives the 50Gbps PAM4 voltage signal and converts it into a current signal to drive the 25G directly modulated laser DML, and the directly modulated laser transmits an optical ...

Embodiment 3

[0080] Based on the DML-based high-speed PAM4 optical transceiver module described in Embodiment 1, the embodiment of the present invention also provides a DML-based high-speed PAM4 optical transceiver module with a loopback test function. Such as Figure 8 as shown,

[0081] The PAM4 conversion unit 12 also includes a 50Gbps PAM4 pattern generator and a 50Gbps PAM4 error testing unit. The PAM4 pattern generator sends a 50Gbps PAM4 electrical signal to the DML optical transmitter unit 13, and the 25G linear driver inside the DML optical transmitter unit 13 receives the voltage signal and converts it into a current signal to drive the 25G direct modulation laser DML. The DML laser 132 transmits an optical signal at a rate of 25 Gbaud to be looped back to the light receiving unit 14 through an optical fiber. The photodetection chip 142 inside the light receiving unit 14 converts the light signal into a current signal, and then the linear transimpedance amplifier 141 converts t...

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Abstract

The invention relates to the technical field of light modules, and provides a DML-based high speed PAM4 light transceiver module. The light transceiver module comprises an interface unit, a PAM4 system conversion unit, a DML light transmitting unit, and a light receiving unit. The interface unit is connected with the PAM4 system conversion unit and is used for transmitting an NRZ electric signal of a first code rate transmitted through the interface unit to the PAM4 system conversion unit. The PAM4 system conversion unit is also connected with the DML light transmitting unit and the light receiving unit. The PAM4 system conversion unit is also used for receiving an electric signal of a second PAM4 modulation code format generated by the light receiving unit. Due to adoption of the module of the PAM4 modulation mode, 50G bit of signal transmission rate can be reached by using only a path of 25G of transmitting component and a path of 25G of receiving component, so that compared with a module of an NRZ modulation mode of the same rate, the module of the PAM4 modulation mode has advantages of simple structure, small volume and low cost.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of optical modules, in particular to a DML-based high-speed PAM4 optical transceiver module. [0003] 【Background technique】 [0004] The rapid application of the Internet and smart terminals has led to explosive growth in the amount of global data, which requires higher and higher Internet bandwidth. How to maximize the use of existing network infrastructure resources to optimize costs and double the data transmission rate has become the biggest challenge. At present, 10Gbps / 25Gbps / 28Gbps NRZ transmission mode is generally used in backplane, system, and short-distance optical fiber transmission. However, when the transmission rate exceeds 28G and evolves to a higher rate, the transmission of electrical signals such as the backplane will cause worse loss of high-frequency signals, and higher-order modulation, such as PAM4, can be transmitted under the same bandwidth. more data. [0005] At present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/40H04B10/524H04B10/50H04B10/69
CPCH04B10/40H04B10/503H04B10/524H04B10/691H04B10/693
Inventor 徐红春陈土泉刘成刚宿志成张武平陈奔
Owner WUHAN TELECOMM DEVICES
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