掺铒光纤放大器作为光学预放的高灵敏度零差相干接收机  

High-Sensitivity Homodyne Coherent Receiver Using EDFA as Preamplifier

作　　者：岳朝磊 孙建锋[1,2] 刘磊 张晓曦 杨燕 侯霞[1,2] 朱韧[1] 陈卫标 Yue Chaolei;Sun Jianfeng;Liu Lei;Zhang Xiaoxi;Yang Yan;Hou Xia;Zhu Ren;Chen Weibiao(Key Laboratory of Space Laser Communication and Detection Technology,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海光学精密机械研究所中科院空间激光信息传输与探测技术重点实验室,上海201800 [2]中国科学院大学材料与光电研究中心,北京100049

出　　处：《中国激光》2019年第11期247-254,共8页Chinese Journal of Lasers

摘　　要：星间高码率光通信系统中由于无法进行光学中继放大,需要高码率、高通信灵敏度的光学接收机。分析了采用掺铒光纤放大器(EDFA)作为光学预放的高灵敏度零差相干接收机方案,并搭建了零差相干通信系统,测试了系统在通信速率为8~10 Gbit/s下的二进制相移键控(BPSK)通信性能。实验表明,此系统在无编码误码率要求为10-3时,10 Gbit/s BPSK通信信号接收灵敏度约为-48 dBm,距离量子噪声极限仅7 dB,优于已发表的10 Gbit/s零差相干通信系统测试结果。Because the intersatellite optical communication system is unable to perform optical relay amplification, optical receivers with high bit rate and high communication sensitivity are desirable. In this study, we first theoretically analyze a high-sensitivity homodyne coherent receiver when an erbium-doped optical fiber amplifier(EDFA) is used as the optical preamplifier. A homodyne coherent receiver based on EDFA is developed, and the performance of BPSK communication system is experimentally analyzed at a communication rate of 8-10 Gbit/s. Experimental results show that the coherent receiver achieves a sensitivity of-48 dBm when the uncoded BER is 10-3 for the 10 Gbit/s BPSK signal. The receiver performance shows only 7 dB penalty compared with quantum noise limit;this value is better than the published test results for the 10 Gbit/s homodyne coherent communication system.

关 键 词：光通信 零差相干探测 光学锁相环 掺铒光纤放大器 自由空间光通信 

分 类 号：O436[机械工程—光学工程]