基于双平行马赫曾德调制器的动态可调光载波边带比光单边带调制:理论分析与实验研究  

Optical single sideband modulation with continuously tunable optical carrier-to-sideband ratio by employing a dual-parallel Mach-Zehnder modulator

作　　者：李晶[1] 宁提纲[1] 裴丽[1] 简伟[1] 油海东[1] 陈宏尧[1] 张婵[1] 李超[1] 

机构地区：[1]北京交通大学光波技术研究所,北京100044

出　　处：《物理学报》2013年第22期233-238,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61177069;61275076;61275092);国家重点基础研究计划(批准号:2010CB328206)资助的课题~~

摘　　要：理论分析并实验研究了一种基于双平行马赫曾德调制器(DP-MZM)具有动态光载波边带比(OCSR)调谐能力的光单边带(OSSB)调制实现方案,方案利用DP-MZM内部集成的三个独立的调制单元,分别实现OSSB调制、光载波移相和光信号干涉,最终,仅需改变调制器的一个偏置点,就实现了OCSR的动态调谐,实验得到了小信号调制(调制系数m=0.2)下,OCSR的可调范围20.8—23.5 dB.并分析了OCSR与射频功率之间的对应关系,通过本方案调谐至最佳的OCSR可提高模拟光链路接收灵敏度.We propose and demonstrate an optical single sideband （OSSB） modulation approach with continuously tunable optical carrier-to-sideband ratio （OCSR） theoretically and experimentally. In the proposal, one dual-parallel Mach-Zehnder modulator （DP-MZM） acts as a key component. By properly setting the modulator, three separate sub-modulators inside the DP-MZM can be used to realize the OSSB modulation, optical carrier phase-shift, and lightwave interference. By adjusting the bias voltage of one sub-modulator, the OCSR can be tuned continuously. In the experiment, the tuning range of OCSR is found to be between？20.8 dB and 23.5 dB at modulation index m=0.2. We also analyze the relationship between the OCSR and RF power after detection. It is found that with properly adjusting the OCSR, the receiver sensitivity can be greatly improved.

关 键 词：光纤通信 微波光子 光载波边带比 光单边带调制 

分 类 号：TN761[电子电信—电路与系统] TN925.93