一种工业光纤通信的时钟数据恢复方法  

A Method of Clock and Data Recovery for Industrial Optical Fiber Communication

作　　者：王明玥 贺永鹏 于志强 张中磊 于洪泽 WANG Mingyue;HE Yongpeng;YU Zhiqiang;ZHANG Zhonglei;YU Hongze(Tianjin Research Institute of Electric Science Co.,Ltd.,Tianjin 300180,China)

机构地区：[1]天津电气科学研究院有限公司,天津300180

出　　处：《电气传动》2024年第11期87-90,96,共5页Electric Drive

基　　金：中国机械工业集团有限公司青年科技基金项目(QNJJ-PY-2022-19)。

摘　　要：工业光纤通信由于晶振误差、码间干扰、基线漂移等原因,接收端会存在数据恢复错误率高的问题。长距离工业光纤通信中,接收端串行数据的电平前后抖动量会增大。针对该问题,提出了一种工业光纤通信的时钟数据恢复方法。方法采用6倍时钟进行过采样,判断串行数据跳变沿并归集到同一时钟下,并动态选择采样时钟。根据电平抖动容差,确认不同情况下所采样数据的有效性。经数据处理,将多路时钟采样的数据恢复为本地时钟下的串行数据,并最终将串行数据转换为并行数据。仿真和测试验证了所提方法的有效性。Because of crystal oscillator error,inter-symbol interference and baseline drift in industrial optical fiber communication,the optical fiber receiver has the problem of high error rate of data recovery.In long-distance industrial communication,the electrical level jitter of serial data at the receiver will increase.To solve this problem,a method of clock and data recovery for long-distance industrial optical fiber communication was proposed.Sixtimes frequency clock was used for sampling.The rising or falling edge of serial data can be determined and collected under the same clock,which can select dynamical sampling clock.According to the electrical level jitter tolerance,the validity of the sampled data under different conditions can be verified.After data processing,the sixtimes sampled data was restored to serial data under the local clock,which is finally converted to the parallel data.Simulation and test verified the effectiveness of the proposed method.

关 键 词：时钟数据恢复 工业光纤通信 现场可编程门阵列(FPGA) 

分 类 号：TN913[电子电信—通信与信息系统]