All-single-mode fiber intracavity displacement sensor based on Er-doped fiber ring laser

Mingpan Bi; Haiwei Zhang; Lifang Xue; Yinping Miao; Wei Shi; Jianquan Yao

doi:10.1117/12.2573709

10 October 2020 All-single-mode fiber intracavity displacement sensor based on Er-doped fiber ring laser

Mingpan Bi, Haiwei Zhang, Lifang Xue, Yinping Miao, Wei Shi, Jianquan Yao

Proceedings Volume 11554, Advanced Sensor Systems and Applications X; 115540K (2020) https://doi.org/10.1117/12.2573709
Event: SPIE/COS Photonics Asia, 2020, Online Only

Abstract

In this paper, we propose and demonstrate a high-integration intracavity displacement-sensor through inserting U-shape single-mode fiber interferometer (U-SMFI) into an Er-doped fiber ring laser. Considering that the U-SMFI can be realized only through bending a SMF, its characteristic of easy fabrication can reduce the cost of manufacturing process in contrast with those wavelength-modulated displacement sensors based on fiber Bragg grating, long-period grating and surface plasmon resonance. When the U-SMFI is inserted into the laser cavity, the variation of the bending radii can modulate the cavity loss so as to have an effect on the spectrum of the output laser. The proposed sensor has a higher signal to noise ratio and a narrower full width at half maximum. Through measuring the change of the spectrum, a high-resolution displacement sensor can be realized. The experimental results indicate that the sensitivities are 39 pm/μm when the bending radius is 6.5 mm.

Conference Presentation

Citation Download Citation

Mingpan Bi, Haiwei Zhang, Lifang Xue, Yinping Miao, Wei Shi, and Jianquan Yao "All-single-mode fiber intracavity displacement sensor based on Er-doped fiber ring laser", Proc. SPIE 11554, Advanced Sensor Systems and Applications X, 115540K (10 October 2020); https://doi.org/10.1117/12.2573709

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