Resonant Fiber Optic Gyroscope With HOPLL Technique Based on Acousto-Optic Modulation
| Autor: | Honghao Ma, Shuang Liang, Changkun Feng, Hongchen Jiao, Zhen Zhou, Lishuang Feng, Yonggui Zhang, Haotian Feng |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Journal of Lightwave Technology. 40:1238-1244 |
| ISSN: | 1558-2213 0733-8724 |
| Popis: | Backscattering noise is a key factor to restrict the performance of resonant fiber optic gyroscopes(RFOG). In order to improve the accuracy of RFOG, this paper proposes a scheme with heterodyne optical phase-locked loop(HOPLL) technique based on acousto-optic modulation(AOM) to suppress backscattering noise. In this scheme, the main light source is divided into three output lights, two of which are frequency-shifted by the AOM, and then they are phase-locked with the third light, using the HOPLL technique. The two channels of frequency-shifted light are respectively used as the clockwise (CW) and counterclockwise(CCW) light of the RFOG, and are locked on the resonance peak. The transmissive fiber resonator can be regarded as a band-pass filter. By adjusting the reference signal in the HOPLL, the carrier of the two frequency-shifted lights can be moved away from the resonance peak. The carrier light intensity of the frequency-shifted light is suppressed by the cavity itself. The suppression ratio(SPR) reaches 15.83dB. The experimental results illustrate that the bias stability of RFOG is 3.8/h based on the Allan deviation, strongly proving the effectiveness of this scheme in suppressing backscattering noise in practical applications. |
| Databáze: | OpenAIRE |
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