A fiber laser temperature-sensing system with customizable sensitivity based on beat frequency demodulation method

Jing Tian; Yi-wu Zuo; Yang Jiang

doi:10.1117/12.2605951

1 November 2021 A fiber laser temperature-sensing system with customizable sensitivity based on beat frequency demodulation method

Jing Tian, Yi-wu Zuo, Yang Jiang

Author Affiliations +

Proceedings Volume 12057, Twelfth International Conference on Information Optics and Photonics; 120572L (2021) https://doi.org/10.1117/12.2605951
Event: Twelfth International Conference on Information Optics and Photonics, 2021, Xi'an, China

Abstract

In this paper, a customizable, sensitive fiber laser temperature-sensing scheme based on beat frequency demodulation method is proposed. The scheme adopts a ring fiber laser cavity structure and monitors temperature variations by tracking changes in the beat frequency signal (BFS). An erbium-doped fiber amplifier is used to provide gain for the optical fiber laser sensing system, and an ordinary single-mode fiber is used as the sensing head. Sensing fibers of different lengths were heated, and the sensitivities were estimated at -0.177, -0.538, and -1.116 kHz/°C for lengths of 1, 4, and 8 m, respectively. Meanwhile, by measuring the monitored frequency shifts, different sensitivities were obtained, estimated at -0.42 and -1.12 kHz/°C for monitored frequencies of 0.5 and 1.168 GHz, respectively. The BFS bandwidth reaches to 8.0 GHz, the signal-to-noise ratio is approximately 65 dB, and the -3dB linewidth is less than 2.5 kHz.

Citation Download Citation

Jing Tian, Yi-wu Zuo, and Yang Jiang "A fiber laser temperature-sensing system with customizable sensitivity based on beat frequency demodulation method", Proc. SPIE 12057, Twelfth International Conference on Information Optics and Photonics, 120572L (1 November 2021); https://doi.org/10.1117/12.2605951

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