An Ultra-Low-Power Optical Transmitter for Short-Reach Optical Communication

LIAO Hailong; WANG Guodong; MIAO Hua; ZHANG Guoping

doi:10.13756/j.gtxyj.2024.230010

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An Ultra-Low-Power Optical Transmitter for Short-Reach Optical Communication

更新时间：2024-05-30

- An Ultra-Low-Power Optical Transmitter for Short-Reach Optical Communication
- Study on Optical Communications Issue 3, Pages: 23001001-23001007(2024)
- 作者机构：
  
  1.中国科学院深圳先进技术研究院，广东　深圳　518000
  2.深南电路股份有限公司，广东　深圳　518000
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2024.230010
  CLC： TN256
- Published：10 June 2024，
  
  Received：18 April 2023，
  
  Revised：30 April 2023，
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廖海龙，王国栋，缪桦，等.用于短距光通信的超低功耗光发射器研究[J].光通信研究，2024（3）：230010.

Liao H L, Wang G D, Miao H, et al. An Ultra-Low-Power Optical Transmitter for Short-Reach Optical Communication[J]. Study on Optical Communications, 2024（3）：230010.
廖海龙，王国栋，缪桦，等.用于短距光通信的超低功耗光发射器研究[J].光通信研究，2024（3）：230010. DOI： 10.13756/j.gtxyj.2024.230010.

Liao H L, Wang G D, Miao H, et al. An Ultra-Low-Power Optical Transmitter for Short-Reach Optical Communication[J]. Study on Optical Communications, 2024（3）：230010. DOI： 10.13756/j.gtxyj.2024.230010.

摘要

【目的】

为拓宽光通信在板级、背板级等短距互联场景的应用，文章设计了一种超低功耗的光发射器。方案的基本原理是采用Bias-T电路加载偏置电流和调制信号，驱动垂直腔面发射激光器（VCSEL）产生光脉冲信号。

【方法】

借助模拟仿真验证了方案的可行性，发现影响传输速率提升的主要因素是激光器件的寄生参数以及驱动电路的阻抗匹配；通过实验研究了在200和10 mm两种电传输距离下，驱动产生的眼图质量及误码率随驱动电压和偏置电流变化的规律。

【结果】

电传输距离缩短至10 mm时，能获得更大有效消光比，范围为0.84～6.69 dB，最小差分驱动电压为200 mV，最小偏置电流为15 mA，光发射功耗降低至1.2 mW/Gbit/s。相比于传统光模块，光发射功耗降低约80%。

【结论】

该光发射器方案可应用于数据中心内部，配合低功耗光接收器，能显著降低数据中心整体功耗。

Abstract

【Objective】

In this paper

an ultra-low power consumption optical transmitter is developed to broaden the application of optical communication in short-reach interconnection such as board level and backplane level. The basic principle of the scheme is that the Vertical-Cavity Surface-Emitting Laser (VCSEL) laser generates an optical pulse signal after loading a bias current and a modulation signal through a Bias-T circuit.

【Methods】

In this work

the feasibility of the scheme is verified by means of simulation. It is also found that the main factors affecting the increase of the transmission rate are the parasitic parameters of the laser device and the impedance matching of the drive circuit. The two electrical transmission distances of 200 and 10 mm are studied by experiments. And the law of eye diagram quality and bit error rate as a function of driving voltage and bias current is studied through experiments under two electrical transmission distances.

【Results】

The results show that a larger effective extinction ratio ranging from 0.84 to 6.69 dB can be obtained by shortening the electrical transmission distance to 10 mm with the minimum differential driving voltage of 200 mV

the minimum bias current of 15 mA

and the power consumption of 1.2 mW/Gbit/s. Compared with traditional optical modules

the power consumption of optical transmission is reduced by about 80%.

【Conclusion】

This optical transmitter solution can be applied to intra-data center. Combined with low-power optical receivers

the overall power consumption of the data center can be significantly reduced.

关键词

光通信短距低功耗光发射器

Keywords

optical communicationshort-reachlow-poweroptical transmitter

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