基于架空光缆的高稳定频率信号传递技术研究

Research on High Stable Frequency Signal Transmission Technology Based on Aerial Optical Cable

摘要:

为解决架空光缆因晃动幅度大和温度变化剧烈引起的相位噪声恶化问题，采用双向传输与预补偿技术，设计了基于电子相位补偿的光纤频率传递方案；首先在包含30km架空光缆、总长133km的实际链路上开展频率传递试验，与单向传输设备相比相位噪声指标提高28dB，其次使用双向传输光纤频率传递设备，与133km全部埋地光缆进行对照测试，在5级风力情况下架空光缆传递相较恶化了4dB，但仍可以满足架空光缆下频率传递使用需求；研究证明基于电子相位共轭的频率传递技术可以有效解决架空光缆传递频率信号导致相位噪声恶化问题，为分布式雷达、分布式守时系统及航天测控等系统多站间同步方案提供支撑。

Abstract:

In order to solve the problem of phase noise deterioration caused by large shaking amplitude and drastic temperature change of overhead optical cable, a fiber frequency transmission scheme based on electronic phase compensation is designed by using bidirectional transmission and pre-compensation technology; Firstly, the frequency transmission test is carried out on a real link with a total length of 133km including 30km overhead optical cable, and the phase noise index is increased by 28dB compared with unidirectional transmission equipment. The the bidirectional transmission optical fiber frequency transmission equipment was used to conduct a comparison test with all 133km buried optical cables, and the transmission of overhead optical cables worsened by 4dB in the case of class 5 wind, but it can still meet the needs of frequency transmission under overhead optical cables; The research proves that the frequency transmission technology based on electron phase conjugation can effectively solve the problem of phase noise deterioration caused by frequency signal transmission of overhead optical cable.