QPSK信号的相干光检测的EVM值分析  

EVM Analysis of Coherent Light Detection of QPSK Signal

作　　者：王小燕[1] WANG Xiao-yan(College of Mechanical and Electrical Engineering,Sanming University,Sanming 365004,Fujian,China)

机构地区：[1]三明学院机电工程学院,福建三明365004

出　　处：《兰州文理学院学报（自然科学版）》2021年第2期60-64,共5页Journal of Lanzhou University of Arts and Science(Natural Sciences)

基　　金：国家自然科学基金青年基金项目(11803015);福建省教育厅中青年教育科研项目(JA15474,JT180514);高教研究项目(SUHE1709)。

摘　　要：与传统强度调制直接检波(IM/DD)相比,相干光通信系统充分利用了光的强度、相位、频率和偏振等信息,大幅度提高频带利用率,延长光通信中继距离.研究分析了正交相移键控(QPSK)信号的调制/解调,相干光检测和数字相干信号处理的原理,应用误差矢量幅度(EVM)对QPSK解调信号的质量进行了分析,实验验证了信号的EVM值随着输入光强度的减弱而增加.Compared with the traditional intensity modulated direct detection(IM/DD),the information of light,such as intensity,phase,frequency and polarization of was fully made use of by the coherent optical communication system,by which the frequency band utilization was greatly improved and the optical communication relay distance extended.The principle of modulation and demodulation,coherent light detection and digital coherent signal processing of orthogonal-phase shift keying(QPSK)signal were studied and analyzed.The quality of QPSK demodulation signal was analyzed by using error vector amplitude(EVM).The experiment verified that the EVM value of the signal increased with the decrease of the input light intensity.

关 键 词：相干光检测 EVM值 QPSK信号 

分 类 号：TN20[电子电信—物理电子学]