Phase noise suppression method of DFB fiber laser microphone based on optical reference

Junpeng Zhao; Chen Zhao; Baichao Zheng; Yong Yang; Xuefeng Wang

doi:10.1117/12.2653257

9 January 2023 Phase noise suppression method of DFB fiber laser microphone based on optical reference

Junpeng Zhao, Chen Zhao, Baichao Zheng, Yong Yang, Xuefeng Wang

Proceedings Volume 12507, Advanced Optical Manufacturing Technologies and Applications 2022; and 2nd International Forum of Young Scientists on Advanced Optical Manufacturing (AOMTA and YSAOM 2022); 1250708 (2023) https://doi.org/10.1117/12.2653257
Event: 2nd International Forum of Young Scientists on Advanced Optical Manufacturing (AOMTA and YSAOM 2022), 2022, Changchun, China

Abstract

In order to reduce the phase noise introduced by the unbalanced interferometer in the distributed feedback (DFB) fiber microphone modulation system, a phase noise compensation method based on a stable laser source as an optical reference is proposed. The narrow linewidth laser source is incident on the unbalanced Michelson interferometer shared by the microphone, so that it has the same optical path difference. This optical phase noise information is used to offset the noise introduced by the interferometer, so as to achieve the purpose of noise suppression. The principle of the unbalanced interferometer composition and suppression are theoretically analyzed and experimentally verified. The experimental results show that under the quiet conditions of the laboratory, compared with the structure that has not been suppressed, the noise of the microphone primitive is reduced from about ± 0.2rad to within ± 0.04rad, the power spectral density is reduced to less than -58.95dB/Hz^1/2. It can be suppressed by more than 32dB at the noise peak, and the suppression effect of the phase noise is very obvious.

Citation Download Citation

Junpeng Zhao, Chen Zhao, Baichao Zheng, Yong Yang, and Xuefeng Wang "Phase noise suppression method of DFB fiber laser microphone based on optical reference", Proc. SPIE 12507, Advanced Optical Manufacturing Technologies and Applications 2022; and 2nd International Forum of Young Scientists on Advanced Optical Manufacturing (AOMTA and YSAOM 2022), 1250708 (9 January 2023); https://doi.org/10.1117/12.2653257

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KEYWORDS

Fiber lasers

Interferometers

Demodulation

Modulation

Phase shift keying

Optical isolators

Interference (communication)

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