High-frequency characterization of an optical phase modulator with phase modulation-to-intensity modulation conversion in dispersive fibers  

作　　者：ZHANG ShangJian LU RongGuo CHEN DeJun LIU Shuang LIU Yong 

机构地区：[1]State Key Laboratory of Advanced Optical Communication Systems and Networks,School of Optoelectronic Information,University of ElectronicScience&Technology of China,Chengdu 610054,China

出　　处：《Chinese Science Bulletin》2012年第22期2929-2933,共5页

基　　金：supported by the National Basic Research Program of China(2011CB301705,2012CB315701);the Program for New Century Excellent Talents in University(NCET-11-0069);the National Natural Science Foundation of China(60907008,60925019,61090393)

摘　　要：We propose a new method for characterizing optical phase modulators based on phase modulation-to-intensity modulation (PM-to-IM) conversion in dispersive fibers.The fiber dispersion spectrally alters the relative phasing of the phase-modulated signal and leads to the PM-to-IM conversion,which is extended to measure the modulation efficiency of optical phase modulators.In the demonstration,the frequency-dependent modulation index and half-wave voltage are experimentally measured for a commercial phase modulator.Compared with conventional methods,the proposed method works without the restriction of small-signal operations,and allows swept-frequency measurement with high resolution and accuracy by using a vector network analyzer.We propose a new method for characterizing optical phase modulators based on phase modulation-to-intensity modulation （PM-to-IM） conversion in dispersive fibers. The fiber dispersion spectrally alters the relative phasing of the phase-modulated signal and leads to the PM-to-IM conversion, which is extended to measure the modulation efficiency of optical phase modulators. In the demonstration, the frequency-dependent modulation index and half-wave voltage are experimentally measured for a commercial phase modulator. Compared with conventional methods, the proposed method works without the restriction of small-signal operations, and allows swept-frequency measurement with high resolution and accuracy by using a vector network analyzer.

关 键 词：相位调制器 强度调制 散纤维 光学 表征 矢量网络分析仪 高频 扫频测量 

分 类 号：TN761[电子电信—电路与系统] TP212[自动化与计算机技术—检测技术与自动化装置]