振动下微波光收发链路附加相位噪声研究

The study on additional phase noise of microwave optical transceiver link under vibration perturbing

摘要:

针对强烈振动条件下,微波光传输链路的附加相位噪声严重恶化的问题。本文首先分析了光链路在振动环境中附加相噪恶化原因,并研究机械振动传递机理,建立了数学仿真模型。仿真与实验分析,得到光链路系统的加速度敏感度,在低频和高频范围内分别为10-12^和10-11^量级。实验结果表明,强振动环境中,光链路系统附加相位噪声恶化40dBc/Hz左右,特别地,在共振处,附加相噪恶化加剧8 dBc/Hz左右。通过减小光链路系统加速度敏感度,避免共振等措施,能有效减弱振动对系统附加相位噪声的影响。

Abstract:

To solve the problem that the additional phase noise of microwave optical transmission link deteriorates seriously under strong vibration environment. In this paper, firstly, the reasons for the deterioration of additional phase noise in the vibration environment of optical link are analyzed. Then the mechanism of vibration transmission is studied and a math model is established. Simulation and experimental analysis show that, the acceleration sensitivity of the optical link system is on the order of 10-12 ^{in the low frequency range}, and 10-11 ^{in the high} frequency range. The experiment result shows that,in a strong vibration environment, the additional phase noise of the optical link system deteriorates to about 40dBc/Hz. In particular, at the resonance, the additional phase noise deteriorates by about 8 dBc/Hz. By reducing the acceleration sensitivity of optical system and avoiding resonance, the effect of vibration on additional phase noise can be effectively reduced.