短光纤延时自外差测量单频激光器频率漂移

基于光纤延时自外差和相位解缠绕技术，提出了一种采用较短的光纤延时线测量单频激光器输出激光频率漂移的方法。从理论上给出了该测量方法的工作原理并分析了测量精度的影响因素；利用一台频率变化可知的激光器对该方法进行了实验验证，实验结果表明该方法能够准确测量激光频率随时间的实际变化曲线；基于此方法，采用6 m 的光纤延时线，对一台1550 nm 波长的单频激光器频率漂移特性进行了3 h 连续测量，得到该激光器长期频率漂移结果为75 MHz/h，与其频率稳定度出厂指标50 MHz/h基本相符。

Abstract

Based on delayed self-heterodyne and phase unwrapping techniques, a new approach to measure the frequency drift of a single-frequency laser by adopting relatively shorter fiber delay lines is proposed. The working principle and factors affecting the measurement accuracy of this method are given in theory. A laser that we can get the function of the frequency fluctuation easily is used to test the presented method. The experimental result demonstrates that the actual curve between laser frequency and time can be acquired accurately by this method. Then the frequency drift characteristic of a 1550 nm wavelength laser is measured by this method with a 6 m fiber delay line in 3 h continuously, resulting in the long-term frequency drift of 75 MHz/h, which is consistent basically with the nominal frequency stability 50 MHz/h.

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段洪成, 吴谨, 赵志龙, 吴曙东. 短光纤延时自外差测量单频激光器频率漂移[J]. 中国激光, 2015, 42(7): 0702008. Duan Hongcheng, Wu Jin, Zhao Zhilong, Wu Shudong. Frequency Drift Measurement on Single-Frequency Laser by Short Fiber Delayed Self-Heterodyne[J]. Chinese Journal of Lasers, 2015, 42(7): 0702008.

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