一种光纤双向时间比对时间码的设计与验证

摘要

提出了一种适用于通过光纤链路实现高精度双向时间比对的时间编码方案.在保留IRIG-B(DC)码型格式的基础上,通过压缩码元宽度实现时间编码信号在光纤链路中的高精度传输.给出了基于FPGA的时间编解码实现方案,在1m电缆和室内50km光纤传输链路上进行了双向时间比对的实验.实验结果表明,该方案可稳定精确地实现时间传递,1m电缆的传输精度优于33ps,50km光纤传输精度优于55ps.%Puts forward a time code scheme through the optical fiber link to realize high precision two-way time. A high precise time transmission on an optical fiber link is realized by compressing the code width of the standard IRIG-B (DC) time codeA scheme is presented to implement the time encoder and decoder in field programmable gate array (FPGA).The two-way time transfer experiments along an 1m coaxial cable and a 50km fiber-optic link are demonstrated.The experimental results show that the scheme can realize time transfer stable and accurate, 1 m cable transmission accuracy is better than 33ps,50km optical fiber transmission accuracy is better than 55ps.