OTDM系统时钟提取和解复用研究  

Research on clock recovery and demultiplexing of OTDM systems

作　　者：贾锡学[1] 李岩[1] 孔德明[1] 伍剑[1] 

机构地区：[1]北京邮电大学信息光子学与光通信研究院国家重点实验室,北京100876

出　　处：《光通信研究》2013年第2期15-18,共4页Study on Optical Communications

基　　金：国家"九七三"计划资助项目(2011CB301702)

摘　　要：为了从高速OTDM(光时分复用)信号中提取出支路时钟并实现解复用,实现高速光信号与相对低速电信号之间的接口,首次展示了一种基于商用的MZM(马赫-曾德调制器)和PolM(偏振调制器)级联的OEO(光电振荡器)实现从2×40GBaud/s OTDM信号中提取支路时钟并同时解复用的实验方案。利用这种改进的OEO,成功地从2×40GBaud/s的OTDM DQPSK(差分四相相移键控)调制格式的高速光信号中提取出了40GHz电时钟,该时钟的相位噪声在10kHz频偏处达到-98.62dBc/Hz,与微波源(Agilent Technologies,E8267D)的相位噪声质量几乎相同。这种OEO还同时实现了从OT-DM信号中解复用出两个支路信号的功能,即将160Gbit/s的PRBS(伪随机二进制序列)OTDM信号成功解复用为两路高质量的80Gbit/s支路信号。In order to recover tributary clock signals from Optical Time Division Multiplexing （OTDM） signals and demultiplex them, and realize the interface between high speed optical signals and relatively lower speed electronic signals, we for the first time demonstrate an experimental scheme on the basis of a commercially available Mach-Zehnder Modulator （MZM） and Polar-ization Modulator （PolM）-cascaded Optoelectronic Oscillator （OEO） for tributary clock recovering and demultiplexing. Using this improved OEO, we recover 40 GHz electrical clock from 2 × 40 GBaud/s optical signals in the OTDM DQPSK modulation format. The phase noise of this clock reaches -98.62 dBc/Hz at 10 kHz frequency offset, almost equivalent to that of the mi-crowave source （Agilent Technologies, E8267D）. Simultaneously, we use this OEO to demultiplex the functions of two tribu-tary signals, i.e. demultiplexing 160 Gbit/s PRBS OTDM signals into two high quality 80 Gbit/s tributary signals.

关 键 词：光电振荡器 光时分复用 时钟提取 解复用 

分 类 号：TN914[电子电信—通信与信息系统]