基于带内时钟导引的置入与提取,提出一种在超高速时分复用系统中的自时钟恢复方案.通过在发送端插入带内时钟导引并在接收端提取出该时钟导引,实现系统时钟的瞬时同步恢复,无需传统时钟恢复中的超快相位比较器和锁相环.实验分别演示了由相位调制和强度调制构造的时钟导引,结果表明所提方法可实现160~40 Gb/s的无误码解复用.该方法在光发射机之后和光接收机之前的光域内对数据信号进行预处理,简化了时钟恢复,同时并未改变光发射机和光接收机的原理、结构和设计,与现行的光纤通信系统兼容.

A novel clock recovery scheme based on inband pilot insertion and extraction was demonstrated for ultrahigh bit rates Optical TimeDivision Multiplexing (OTDM) system. The clock recovery function was realized by inserting and extracting an inband clock pilot located in the data spectrum, which did not need any ultrafast phase comparator or phaselocked loop in the receiver. The scheme allowed fast synchronization, low timing jitter and highly stable recovered clock for OTDM receivers. The clock pilot was constructed with phase modulation and intensity modulation, respectively, which showed errorfree operation of 160to40 Gb/s demultiplexing. The proposed method simplfies clock recovery configuration throught preprocessing of data signal in the optical domain between optical transmitter and receiver, which is compatabile with standard OTDM system after minor modification of optical transmitter and receiver.