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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1GHz,光纤链路长度为25.2km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。
In order to study the performance of microwave signal fiber transmission, a new method of microwave signal fiber transmission to offset the phase fluctuation at the far end is proposed. The method uses the Faraday rotator mirror to return the far-end optical signal back to the far end. The phase fluctuation caused by the temperature and pressure changes of the optical fiber link is offset and compensated by the remote multiplying frequency mixing circuit. Theoretical simulation and verification experiments verify the effectiveness of this method. In the experiment of microwave modulation frequency of 1GHz and optical fiber link length of 25.2km, the loss of stability of frequency transfer is 2 × 10-12 s-1 and 6 × 10-17 d-1. This method optimizes the structure of the local end. The local end does not need the optoelectronic conversion, the accurate measurement of the phase information and the real-time compensation system are not designed, and the influence of the phase disturbance introduced by the optical fiber link on the long-term stability can be reduced by about three orders of magnitude.