相干光通信链路外差接收技术研究  

Research on the Technology of the Coherent Optical Communication Link

作　　者：程德芳[1] 徐小华[1] 于娜[1] 

机构地区：[1]邢台职业技术学院,河北邢台054000

出　　处：《激光杂志》2016年第2期125-127,共3页Laser Journal

基　　金：邢台市科技局科技计划自筹项目(2015ZC015)

摘　　要：相干光通信链路属于天地一体化高速通讯网络节点连接的关键链路。着眼于外差效率表征大气湍流扰动之后信号光及本振光相干合成指标,从而推导非均匀湍流路径上外差效率理论表达式,充分结合大气折射率结构常数轮廓进行相干光通信链路外差效率仿真。目前,主流光通信系统均是运用幅度调值或是直接解调方式实现通信,也就是说将光看作载波,信号作光载波施以强度调制方式,接收端侧信道中所传递的光信号可直接展开包络解调,恢复发端信号以实现通信。此类系统接收灵敏度偏低,同时频带利用率不高,使得系统中继距离及传输容量非常有限。本文分析了相干光通信链路外差技术,并提出实用性应用策略。coherent optical communication link is the key link of integrated high- speed communication network node connection.Focusing on the heterodyne efficiency of the signal and the coherent combination with the local oscillator light,the theoretical expression of the heterodyne efficiency in inhomogeneous turbulent path is derived,and the coherent optical communication link heterodyne efficiency is fully integrated with the atmospheric refractive index structure constant for simulating. At present,mainstream optical communication systems are using amplitude tone or direct demodulation mode to realize the communication,that consider the light as carrier,signals are optical carrier imposed on intensity modulation mode,optical signal of the receiver channel transmission can be directly process the envelope demodulation,restore the transmitter to achieve communication.Such systems have low receiving sensitivity,and the bandwidth efficiency is not high,making the system relay distance and transmission capacity is extremely limited.In this paper,we analyze the coherent optical communication link heterodyne technique,and propose the practical application strategy.

关 键 词：相干光通信 外差探测 异步解调 

分 类 号：TN958.98[电子电信—信号与信息处理]