光学学报, 2014, 34 (7): 0706001, 网络出版: 2014-05-14
基于相位波动远端补偿的微波频率光纤传递新方法
New Microwave Frequency Dissemination Method over Optical Fiber Based on the Phase Fluctuation Compensated at Remote Sites
光通信 微波频率传递 频率稳定度 时延波动残留 光纤链路 optical communications microwave frequency dissemination frequency stability transfer delay fluctuation residual optical fiber link
摘要
为研究微波信号光纤传递的性能,提出了一种对相位波动在远端进行抵消补偿的微波信号光纤传递新方法。该方法利用法拉第旋转镜将远端返回的光信号再次返射至远端,对光纤链路因温度、压力变化引入的相位波动通过远端的倍频混频电路进行抵消补偿。理论仿真与验证实验证实了该方法的有效性。在微波调制频率为1 GHz,光纤链路长度为25.2 km的实验中,频率传递的稳定度损失为2×10-12 s-1 和 6×10-17 d-1。此方法优化了本地端的结构,本地端不需要光电光转换,无需设计相位信息的精确测量与实时补偿系统,且光纤链路引入的相位扰动对长期稳定度的影响可以降低约三个数量级。
Abstract
In order to study the performance of microwave frequency transfer based on fiber link, a novel ultra-stable radio frequency dissemination system over optical fiber is proposed. The system utilizes a Faraday rotator mirror to reflect the optical signal back to remote sites, where the phase fluctuation introduced by temperature and pressure changes is counteracted by the frequency multiplier mixer circuit at remote sites. Its validity is tested through simulation and experiment. The transmission of 1 GHz signals over 25.2 km optical fiber is experimentally demonstrated, where relative stability of 2×10-12 s-1 and 6×10-17 d-1 is obtained. The main advantages of the proposed system are that the local sites structure is simplified, and the signal conversion of optical-electronic-optical and the phase fluctuation measurement and compensation systems can be removed at local sites. In addition, the fiber-induced phase noises can be suppressed by three orders of magnitude in the long-term.
李得龙, 卢麟, 张宝富, 李晓亚, 滕义超. 基于相位波动远端补偿的微波频率光纤传递新方法[J]. 光学学报, 2014, 34(7): 0706001. Li Delong, Lu Lin, Zhang Baofu, Li Xiaoya, Teng Yichao. New Microwave Frequency Dissemination Method over Optical Fiber Based on the Phase Fluctuation Compensated at Remote Sites[J]. Acta Optica Sinica, 2014, 34(7): 0706001.