光学学报, 2019, 39(9): 0906003, 网络出版: 2019-09-01

基于时频共传的光纤链路时延测量方法

Time Delay Measurement of Optical Fiber Link Using Time-Frequency Joint Transfer
作者单位

陆军工程大学通信工程学院, 江苏 南京 210007

摘要
针对光纤链路大量程、高精度时延的测量要求,提出了秒脉冲信号与频率信号同波长共传方案。该方案将秒脉冲计数法粗测与频率信号比相法细测的结果拼接组合,以实现对光纤链路真时延的高精度测量。搭建了实验测量系统,验证了粗、细测量结果的一致性,测量了剧烈温变条件下25 km光纤链路的绝对时延及其时延变化。实验结果表明,该方法能够将脉冲计数法的大量程优势和相位测量法高分辨率优势有效融合。
Abstract
A joint transfer scheme of frequency and one pulse-per-second time signals based on the same wavelength is proposed to meet the time delay measurement requirements of large-range and high-precision fiber-optic links. The scheme combines the coarse results of the one pulse-per-second time counting method and fine results of frequency signal phase-comparison method to achieve high-precision and large dynamic measurement of the true delay of the fiber link. We construct an experimental system to verify the consistency of the coarse and fine measurements and measure the absolute delay of the signal over 25 km of optic fibers under severe temperature change conditions. The experimental results demonstrate that the proposed method can effectively combine the large-range advantage of the one pulse-per-second counting method with the high-resolution advantage of the phase measurement method.
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