基于电子相位补偿的光纤频率传递技术

Research on Optical Fiber Frequency Transfer Technology Based on Electronic Phase Compensation

针对远距离光纤频率直接传递由机械应力引入的相位噪声,分析了机械应力对频率传递性能的影响,设计了基于电子相位补偿的光纤频率传递方案,进行了光缆晃动模拟试验,并在实际架空光缆上进行试验,补偿了大部分由光缆环境变化引起的相位抖动,时钟源输出相位噪声为-120 dBc/Hz@1 Hz的10 MHz频率信号,经过基于电子相位补偿光纤频率传递系统后相位噪声达-111 dBc/Hz@1 Hz,与未进行电子相位补偿光纤频率传递相比相位噪声提高12 dB,实现10 MHz频率信号高质量传输。

Aiming at the phase noise induced by mechanical stress in long-distance optical fiber frequency direct transmission,the influence of mechanical stress on frequency transmission performance was analyzed.And the optical fiber frequency transmission scheme based on electronic phase compensation was designed.Test was performed to compensate most of the phase jitter caused by the change of the optical cable environment.The phase noise of the 10 MHz frequency signal output by the clock source is-120 dBc/Hz@1 Hz,and the phase noise reaches-111 dBc/Hz@1 Hz after the optical fiber frequency transmission system based on electronic phase compensation.Compared with optical fiber frequency transmission without electronic phase compensation,the phase is improved 12 dB,to achieve high-quality transmission of 10 MHz frequency signal.