基于模拟移相补偿的长距离光纤频率传输

为实现频率信号在长距离光纤上的高精度传输，设计了一个纯电的相位补偿系统，其补偿速度较快，范围较大，且便于模块化。该系统主要利用两次模拟移相抵消返回信号中所引入的双程相位抖动来进行补偿，结构简单，易于调试。通过引入数字信号处理和比例积分微分(PID)控制算法，可以提高系统的补偿精度和工作稳定性。最后，利用该系统在100 km 的实验室光纤上进行100 MHz 频率信号的传输实验，得到的频率稳定度为3.9×10-14/s 和1.1×10-16/4000 s，证明了此方法在长距离光纤频率传输中的可行性，为导航、航天以及空间探测等领域中远距离站点的协同工作，提供频率同步支持。

Abstract

To achieve high- stability and high- precision dissemination of radio frequency signals over a long distance optical fiber link, a pure-electric phase compensation system is proposed. It can be easily modularized and achieve highly compensation speed and range. This system mainly uses two analog phase shifters to balance the phase fluctuation introduced by the round-trip fiber link. Due to the simple structure, it is easy to debug and test. By introducing the digital signal processing and proportion integration differentiation (PID) control algorithm, the system can effectively compensate the fiber- induced phase noise and ensure a high- accuracy frequency distribution. Finally, using this system in a 100 MHz frequency transfer experiment via 100 km optical fiber, an stabilities of 3.9×10-14/s and 1.1×10-16/4000 s are achieved. The experiment proves that this system is feasible in the long-distance radio frequency transfer and provides a technical support for the frequency synchronization needed in the cooperative working of remote stations, such as navigation, aerospace and space exploration.

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任丽霞, 章双佑, 钱程, 赵建业. 基于模拟移相补偿的长距离光纤频率传输[J]. 中国激光, 2015, 42(4): 0405005. Ren Lixia, Zhang Shuangyou, Qian Cheng, Zhao Jianye. Radio-Frequency Transfer over a Long-Distance Fiber Link Based on Analog Phase Shift Compensation[J]. Chinese Journal of Lasers, 2015, 42(4): 0405005.

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