Acta Optica Sinica, Volume. 41, Issue 13, 1306010(2021)
Laser Frequency Noise Power Spectral Density Measurement Technology and Its Application to Resonant Optical Fiber Gyroscope
A resonant optical fiber gyroscope (RFOG) is an optical sensor that measures the angular rate of rotation proportional to the difference between the resonant frequency of the clockwise and counterclockwise optical paths generated by the Sagnac effect. A narrow linewidth laser with a continuously adjustable center frequency is a key element for developing RFOG, and the frequency noise characteristics of the laser directly affect the performance of this gyroscope. In this study, the frequency noise power spectral density of different types of lasers and the lasers before and after frequency locking was measured using an unbalanced Mach-Zehnder interferometer system based on a 3×3 coupler. The 1/f and white noise characterization coefficients of different types of lasers and the lasers before and after frequency locking were obtained. The study results can provide an important reference for selecting RFOGs with different accuracies and optimizing resonant frequency servo loops.
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Shuang Liu, Hanzhao Li, Lu Liu, Weiwen Qian, Yi Lin, Huilian Ma. Laser Frequency Noise Power Spectral Density Measurement Technology and Its Application to Resonant Optical Fiber Gyroscope[J]. Acta Optica Sinica, 2021, 41(13): 1306010
Category: Fiber Optics and Optical Communications
Received: Feb. 25, 2021
Accepted: Mar. 23, 2021
Published Online: Jul. 11, 2021
The Author Email: Ma Huilian (mahl@zju.edu.cn)