微波光子链路中的附加相位噪声分析

针对模拟微波光子链路中附加相位噪声对微波信号相位噪声的恶化问题,详细研究了光链路中白噪声及有色噪声的产生机理,建立了光链路的附加相位噪声理论模型,阐述了附加相位噪声的变化规律,并通过实验证实了模型的正确性。同时针对本振信号的多路光分配典型应用,提出了EDFA辅助的附加相位噪声优化措施。实验结果表明所提出的相位噪声模型能够有效地应用于微波光子链路,能对附加相位噪声的分析和优化提供理论依据,具有较大的工程指导意义。

Analysis of Addictive Phase Noise in Microwave-Photonic Links with External Modulation

For the degradation problem of microwave signal phase noise caused by the additional phase noise of analog microwave photonic link, the characteristics of the white noise and frequency noise of microwave photonic link (MPL) were fully analyzed. The addictive phase noise (APN) model of MPL was established to expound the APN behaviors, and the correctness of the model was also verified by experiments. As for the typical applications of local oscillator optical distribution system, the EDFA-assisted MPL can be used to improve the APN. Experimental results indicate that the proposed phase noise model can be effectively applied to the microwave photonic link and can provide theoretical basis for the analysis and optimization of additional phase noise.