应用并行MZM降低光载OFDM系统的非线性失真  

Reduction of Signal Nonlinear Distortion in CO-OFDM Systems By Dual-parallel Mach-Zehnder Modulators

作　　者：王芳[1] 陈勇[1] 叶志清[1] 

机构地区：[1]江西师范大学物理与通信电子学院,南昌330022

出　　处：《半导体光电》2012年第6期866-870,878,共6页Semiconductor Optoelectronics

基　　金：国家自然科学基金资助项目(60967002)

摘　　要：针对传统马赫-曾德尔调制器(MZM)在光载正交频分复用(OFDM)系统中的非线性失真问题,提出了一种新的并行MZM结构,该结构由主调制器和起补偿作用的子调制器组成。理论分析与仿真表明:通过设计调制器电极长度与输入光功率,使得相位误差衰减因子小于1,此时并行MZM的非线性失真小于传统MZM。在相同调制指数下,并行MZM对应的星座图更加收敛,但随着调制指数的增加而逐渐发散。A new dual-parallel Mach-Zehnder modulator（MZM） consisting of a primary modulator and a compensative sub-modulator was applied to reduce the signal nonlinear distortion in Coherent Optical OFDM（CO-OFDM） systems.Analysis and simulation results show that the signal nonlinear distortion of dual-parallel MZM is less than that of conventional MZM when phase error attenuation factor is less than 1 by designing modulator electrode length and input optical power.With the same modulation index,the constellation diagram of dual-parallel MZM is much more convergent than that of conventional MZM.While with the increase of modulation index,the constellation diagram gradually becomes divergent.

关 键 词：非线性失真 正交频分复用 马赫-曾德尔调制器 

分 类 号：TN911[电子电信—通信与信息系统]