摘要
研究了不等臂M-Z干涉仪鉴频的基本原理,对采用三角波调制改变干涉仪臂长获得鉴频信号的过程进行了定量分析.在此基础上,仿真计算了线性改变干涉仪臂长和频率漂移对鉴频信号输出的影响,采用LiNbO3相位调制器取代PZT(Piezo-Electric Transducer)调制方式,设计实现了鉴频实验装置,获得的实验结果与理论和仿真结果吻合.对驱动信号和环境扰动对该方案的影响进行了实验验证和理论分析,与PZT调制方式相比,无需高精度温控装置,系统工作稳定可靠,信号调制动态范围可以从PZT调制方式下的几十Hz扩大到GHz.同时可以在该方案中采用lock-in确定相位-频率响应度,从而测定激光器的频率波动范围.
An improved laser frequency discriminator using all fiber unbalanced-arm Mach-Zehnder interferometer technique was studied in detail. The acquisition technique of frequency error signal through utilizing triangular wave to modulate the an arm of interferometer was analyzed quantitatively. The piezo-electric transducer （PZT）-type frequency modulator was replaced with LiNbO3 phase modulator. The interferometer output signal was calculated through emulator. An experimental setup to validate the theoretical analysis was constructed. The result was agreement with simulation result. The modulation signal and environment perturbations were evaluated through experiment. The result shows the system stability is improved greatly, and the modulation dynamic range is extended from Hz to GHz. The phase to frequency responsibility was measured by applying lock-in amplifier, and the peak to peak frequency fluctuation of measured laser can be calculated according to the phase to frequency responsibility.
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2009年第12期1421-1424,共4页
Journal of Beijing University of Aeronautics and Astronautics
关键词
激光器
不等臂M-Z干涉仪
鉴频
相位调制器
laser
unbalanced-arm Mach-Zehnder interferometer
frequency discriminator
phase modulator
