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提出了一种基于单光子探测的光纤传输时间峰值扫描测量方法。通过调节门控信号的到达时间以及与光脉冲匹配的开闸宽度,统计单光子探测器的计数率峰值来判断光脉冲的准确到达时刻,避免了单光子探测器在盖格工作模式下输出雪崩脉冲的时间抖动测量误差。在理论分析峰值扫描测量法的基础上,设计了峰值扫描测量实验系统,在长度为125 km光纤信道上测量光脉冲传输时间精度达到35 ps,同时验证了实验系统测量的准确度约为13 ps。
A method based on single-photon detection for measuring the transmission time of optical fiber is proposed. By adjusting the arrival time of the gated signal and the opening width matched with the optical pulse, the counting peak of the single-photon detector is counted to determine the accurate arrival time of the optical pulse and the output of the single-photon detector in the avalanche mode is avoided Pulse jitter measurement error. Based on the theoretical analysis of the peak-scan measurement, a peak-scan measurement experiment system was designed. The measurement accuracy of the optical pulse transmitted over a length of 125 km fiber channel was 35 ps, and the accuracy of the experimental system was verified to be about 13 ps .