相干光通信中基于QPSK调制的光锁相环分析  

Analysis of Optical Phase-locked Loop for Coherent Optical Communication Based on QPSK Modulation

作　　者：吕曦光[1] 王磊[1] 徐东明[1] 刘伟丽[1] 马静芳[1] 

机构地区：[1]长春理工大学光电工程学院,长春130022

出　　处：《长春理工大学学报（自然科学版）》2013年第3期49-52,共4页Journal of Changchun University of Science and Technology(Natural Science Edition)

摘　　要：基于四相相移键控(QPSK)调制的光锁相环工作原理,通过建立环路数学模型系统分析了QPSK环路接收系统激光器线宽以及噪声对相干光通信的影响。对环路带宽进行了优化取值,分析了在最小误差方差下环路对激光线宽的要求。最后给出了不同比特光子数下,接收系统误码率与输入信噪比关系。In this paper,on the basis of OPLL principle with QPSK modulation,the impact of laser line-width and noise on the coherent optical communication were systematically analyzed.The value of the loop bandwidth was optimized,under the condition of the minimum phase-error,the requirement for laser line-width was analysed,Finally,under the circumstance of different bit number of photons.the relationship between the error rate of the QPSK receiving system and the input SNR.

关 键 词：光锁相环 激光线宽 QPSK调制 噪声 

分 类 号：TP873[自动化与计算机技术—检测技术与自动化装置]