摘要
提出了一种简化的相干检测系统,通过在时域上交替探测信号的同向(I)及正交(Q)信息分量,实现了基于单个平衡光电探测器(BPD)的相位分集接收。仿真结果表明,25 Gbit/s的非归零信号经过25 km标准单模光纤传输时,在10-3误码率门限下,其接收灵敏度为-39.97 dBm。用Gram-Schmidt正交化过程算法对信号光与本振(LO)光之间频率偏移引起的I、Q分量失配角进行补偿,当频率偏移小于符号速率的1/5(±5 GHz)时,灵敏度代价约为3.2 dB。此外,当LO光功率较高时,用单PD取代BPD的灵敏度损失约为3 dB。本方案为实现低成本的相干检测提供了一种解决方法。
We propose a simplified coherent detection system, which achieved phase diversity reception based on a single balanced photodetector(BPD) by alternately detecting the in-phase(I) and quadrature(Q) information components of a signal in the time domain. The simulation results show that a 25 Gbit/s non-return-to-zero signal has a receiving sensitivity of-39.97 dBm at a bit-error-rate threshold of 10;after 25 km of standard single-mode fiber transmission. The Gram-Schmidt orthogonalization process algorithm is used to compensate the mismatch angle between the I and Q components caused by the frequency offset between the signal light and the local oscillator(LO) light. When the frequency offset is less than 1/5 of the symbol rate(±5 GHz), the sensitivity penalty is about 3.2 dB. In addition, a single PD can be used to replace the BPD if the LO optical power is high, and the sensitivity penalty is about 3 dB. The scheme provides a solution for low-cost coherent detection.
作者
李赟
李正璇
黄新刚
杨波
钟一鸣
马壮
宋英雄
Li Yun;Li Zhengxuan;Huang Xingang;Yang Bo;Zhong Yiming;Ma Zhuang;Song Yingxiong(Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai University,Shanghai 200444,China;ZTE Corporation,Shanghai 201203,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2021年第20期7-15,共9页
Acta Optica Sinica
基金
上海市科委项目(20511102400,20ZR1420900)
111计划(D20031)。
关键词
光通信
相干检测
相位调制
频率偏移
正交化算法
optical communications
coherent detection
phase modulation
frequency offset
orthogonalization algorithm
作者简介
通信作者:李正璇,zhengxuanli@shu.edu.cn。
