原子频标光纤长距离传递的稳定度损失分析

为研究利用长距离光纤链路进行原子频标传递遭受的稳定度损失，建模分析了光纤传输系统中强度噪声、色散和温度对光纤频标传递系统的影响。分析结果表明，除强度噪声外，其他因素的影响大小均与频标频率值无关；气温导致光纤链路长度的变化是劣化长期稳定度的主要因素，必须利用数十纳秒范围的高分辨率时延补偿才能保证频标的无损传递；激光器的频率噪声和光纤色散的综合作用会劣化频标传递的中短期稳定度，但可以通过色散控制与补偿技术抑制消除其影响；强度噪声是影响原子频标短期稳定度的主要因素，对于10 MHz的频标信号而言，接收端信噪比在110 dB以上才能保证原子频标秒稳定度损失优于10-13/s。

Analyses of stability loss for frequency transferred by long distance fibre

The sources of stability loss in fiber optic frequency delivery system, such as intensity noise, dispersion and temperature, were deliberately simulated for the purpose of getting stability loss in long distance frequency transferring system. It is confirmed that the impact of these factors all have nothing to do with the transferred frequency except the intensity noise. Temperature is the key factor for the loss of long term stability. True time delay compensation measures with ten's of nanoseconds large scale and high resolution should be concerned to achieve lossless transferring.Dispersion noise degrades short and mid term stability, but this effect can be eliminated by dispersion compensation and management. Intensity noise is the major factor for short term stability. It suggests that the SNR should be larger than 110 dB to guarantee frequency stability loss less than 10-13/s.