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光纤器件尤其是光纤电光调制器(EOM)在简化PDH频率锁定装置的同时会诱发残余幅度调制(RAM),该效应会使PDH误差信号出现一个受环境温度影响的直流偏置,同时线型也出现一定程度的扭曲,这不仅会使频率锁定点发生漂移,同时也会影响频率锁定的时间。对PDH误差信号中存在RAM的线型进行理论和实验分析,并利用Hnsch-Couillaud(HC)技术抑制RAM,在实验上获得了无偏置且信号对称的PDH误差信号。分别利用RAM抑制闭环和开环的误差信号,进行了激光到腔模的频率锁定,验证了RAM抑制方案可以极大地增加基于光纤EOM的PDH频率锁定技术的稳定性。
Fiber optic devices, especially optical fiber electro-optical modulators (EOMs), simplify the PDH frequency locking device and induce residual amplitude modulation (RAM), which can cause a DC offset of the PDH error signal that is affected by ambient temperature, A degree of distortion occurs which not only distorts the frequency lock point but also affects the frequency lock time. The theoretical and experimental analysis of the RAM linearity in the PDH error signal was performed, and the Hnsch-Couillaud (HC) technique was used to suppress the RAM. An unbiased and signal-symmetric PDH error signal was obtained experimentally. The RAM and the open-loop error signals are respectively used to suppress the frequency-locked laser-cavity modes. The RAM suppression scheme can greatly increase the stability of the PDH frequency-locking technique based on optical fiber EOM.