高速光传输系统中八进制差分相位幅度键控性能分析  

Analysis of the Transmission Performance of Octal Differential Phase-Amplitude-Shift Keying in High Speed Optical Fiber Communication System

作　　者：文爱军[1] 刘姣姣[1] 李晓军[1] 

机构地区：[1]西安电子科技大学综合业务网国家重点实验室,陕西西安710071

出　　处：《中国激光》2009年第3期614-619,共6页Chinese Journal of Lasers

基　　金：高等学校学科创新引智计划(B08038)资助课题

摘　　要：高级光调制格式能够有效抑制随信道速率的增加而给系统带来的色散、非线性等传输损伤,是高速光传输系统的关键技术之一。研究了基于马赫-曾德尔调制器(MZM)产生的八进制差分相位幅度键控非归零码(NRZ-ODPASK)、八进制差分相位幅度键控归零码(RZ-ODPASK)以及八进制差分相位幅度键控载波抑制归零码(CSRZ-ODPASK)在40 Gbit/s速率下的传输性能。结果表明,RZ-ODPASK调制格式抗色散能力较强,且相位支路的色散容限均大于幅度支路;在波分复用(WDM)系统中,CSRZ-ODPASK信道间串扰代价比NRZ-ODPASK和RZ-ODPASK分别小0.81 dB和0.19 dB,更加适合高速光纤传输系统。Advanced optical modulation format is one of the key technologies of high-speed optical transmission system because of its capability in mitigating transmission impairments, such as dispersion and nonlinear effects. We study the transmission characteristics of non return-to-zero octal differential phase-amplitude-shift keying (NRZ-ODPASK), return-to-zero octal differential phase-amplitude-shift keying (RZ-ODPASK), and carrier-suppressed return-to-zero octal differential phase-amplitude-shift keying (CSRZ-ODPASK) modulation formats for 40 Gbit/s system. It is shown that RZ-ODPASK format can tolerate more chromatic dispersion than the other two formats, especially in its phase channel. Furthermore, for WDM systems, CSRZ-ODPASK format performs better than NRZ-ODPASK and RZ-ODPASK in crosstalk penalty by 0.81 dB and 0.19 dB, respectively. CSRZ-ODPASK is a good choice for high speed optical fiber communication system.

关 键 词：光纤通信 调制格式 八进制差分相位幅度键控 色散容限 串扰 

分 类 号：TN929.11[电子电信—通信与信息系统]