Analysis of laser intensity noise and the compensation technology in resonator fiber-optic gyroscope

Huaifeng Liu; Lishuang Feng; Hongchen Jiao; Ning Liu

doi:10.1117/1.OE.57.11.116105

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29 November 2018 Analysis of laser intensity noise and the compensation technology in resonator fiber-optic gyroscope

Huaifeng Liu, Lishuang Feng, Hongchen Jiao, Ning Liu

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Optical Engineering, 57(11), 116105 (2018). https://doi.org/10.1117/1.OE.57.11.116105

Abstract

The laser is an important component of the resonator fiber-optic gyroscope (RFOG) and the optical noise of the laser severely limits the performance of the RFOG system. The mathematical model which presents the effect of the intensity noise on the RFOG is established. In order to verify the correctness of the model, an acousto-optic modulator is innovatively used to generate the intensity noise of the laser, through which the intensity noise could be quantitatively changed without introducing unexpected noises of the laser. The experimental results indicate the intensity noise results in the deterioration of the scale factor nonlinearity and the increase of detected rotation rate error. In addition, a scheme based on the second harmonic demodulation of the intensity-modulated signal is proposed to compensate the light intensity fluctuation of the laser in the RFOG. The test results show the drift of the gyro introduced by the light intensity fluctuation could be reduced >8 dB through this method.

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Huaifeng Liu, Lishuang Feng, Hongchen Jiao, and Ning Liu "Analysis of laser intensity noise and the compensation technology in resonator fiber-optic gyroscope," Optical Engineering 57(11), 116105 (29 November 2018). https://doi.org/10.1117/1.OE.57.11.116105

Received: 8 June 2018; Accepted: 6 November 2018; Published: 29 November 2018

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