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2×40 GBaud/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2×40 GBaud/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40 GHz电时钟, 该时钟的相位噪声在10 kHz频偏处达到-98.62 dBc/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OTDM信号中解复用出两个支路信号的功能, 即将160 Gbit/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80 Gbit/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 Polarization 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 microwave source (Agilent Technologies, E8267D). Simultaneously, we use this OEO to demultiplex the functions of two tributary signals, i.e. demultiplexing 160 Gbit/s PRBS OTDM signals into two high quality 80 Gbit/s tributary signals.