光纤稳相微波频率传输中相干瑞利噪声的影响与抑制

利用光纤进行相位稳定的微波频率参考的远距离分配,在深空科学研究、基础物理测量以及多基地雷达技术方面有着广泛的应用需求。研究了基于往返相位校正的光纤稳相传输理论,建立了稳相传输的理论模型,搭建了基于光电延迟锁相环的光纤稳相传输实验系统,理论分析并实验研究了相干瑞利散射噪声对系统传输相位稳定性的影响。研究发现相干瑞利散射噪声不仅直接造成远端信号信噪比恶化,并且通过锁相环路转化为系统残余相位噪声,进一步恶化远端信号的稳定性,成为影响稳相传输系统性能的主要因素。针对该问题,提出了双波长的稳相传输技术,有效地克服了相干瑞利散射噪声的影响,实现了10GHz微波频率参考、100km光纤稳相分发,传输至远端的相位均方根抖动(RMS-jitter)低于730fs。     

Tunable phase-stabilized infrared parametric laser source

This paper reports that the tunable self-phase-stabilized infrared laser pulses have been generated from a two-stage optical parametric amplifier. With an 800 nm pump source, the output idler pulses are tunable from 1.3 μm to 2.3 μm, and the maximum output energy of the idler pulses is higher than 1 mJ at 1.6 μm by using 6 mJ pump laser. A carrier-envelope phase fluctuation of ～ 0.15 rad (rms) for the idler pulses is measured for longer than one hour by using a home build f-to-2f interferometer.