电信科学 ›› 2018, Vol. 34 ›› Issue (3): 118-123.doi: 10.11959/j.issn.1000-0801.2018091

• 研究与开发 • 上一篇    下一篇

短距光传输系统中基于PAM4调制的带限接收技术

刘群1(),杜慧琴1,2,吴香林1   

  1. 1 四川现代职业学院,四川 成都 640207
    2 四川大学计算机学院,四川 成都 610211
  • 修回日期:2018-01-19 出版日期:2018-03-01 发布日期:2018-04-02
  • 作者简介:刘群(1986?),女,四川现代职业学院讲师,主要研究方向为通信与信息系统。|杜慧琴(1985?),女,四川大学计算机学院硕士生,四川现代职业学院讲师、高级工程师,主要研究方向为数据库技术。|吴香林(1987?),女,四川现代职业学院工程师,主要研究方向为移动通信技术。

A band-limited receiver technology based on PAM4 modulation for the short distance optical transmission system

Qun LIU1(),Huiqin DU1,2,Xianglin WU1   

  1. 1 Electronic Information Technology Department of Sichuan Modern Vocational College,Chengdu 640207,China
    2 College of Computer Science,Sichuan University,Chengdu 610211,China
  • Revised:2018-01-19 Online:2018-03-01 Published:2018-04-02

摘要:

针对强度调制和直接检测(IM-DD)短距光传输系统中,由于光器件带宽受限特性,导致接收端检测到的PAM4信号存在较大符号间干扰(inter symbol interference,ISI),给出了一种基于判决反馈均衡器(DFE)级联超奈奎斯特速率(FTN)传输的带宽受限下的补偿方案,并在不同的带宽受限场景下进行了仿真验证。仿真结果表明,该带宽受限补偿方案能够有效地恢复接收到的PAM4信号,在误码率低于10-3时,有1 dB左右的性能收益。

关键词: 强度调制和直接检测, 4级脉冲幅度调制, 带限信道, 超奈奎斯特速率, 符号间干扰

Abstract:

In intensity modulation and direct detection of the short distance optical transmission system,there is some serious ISI (inter symbol interference) for the detected PAM4 signal due to the band-limited performance for the optical devices.A band-limited compensation algorithm based on DFE (decision feedback equalizer) combined FTN (fast than Nyquist) transmission was proposed.Then the algorithm performance gain was simulated in different band-limited scenarios,and the simulation results show that this algorithm can be useful to demodulate PAM4 receiver signal.What is more,there is about 1 dB performance gain at the bit error rate (BER) of 10-3for the serious conditions.

Key words: intensity modulation-direct detection, PAM4, band-limited channel, fast-than-Nyquist, ISI

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