Fiber Bragg grating Fabry-Perot cavity sensor based on pulse laser demodulation technique

Fangfang Gao; Jianfeng Chen; Yunqi Liu; Tingyun Wang

doi:10.1117/12.905535

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29 November 2011 Fiber Bragg grating Fabry-Perot cavity sensor based on pulse laser demodulation technique

Fangfang Gao, Jianfeng Chen, Yunqi Liu, Tingyun Wang

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Proceedings Volume 8307, Passive Components and Fiber-Based Devices VIII; 83072A (2011) https://doi.org/10.1117/12.905535
Event: SPIE/OSA/IEEE Asia Communications and Photonics, 2011, Shanghai, China

Abstract

We demonstrate a fiber laser sensing technique based on fiber Bragg grating Fabry-Perot (FBG-FP) cavity interrogated by pulsed laser, where short pulses generated from active mode-locked erbium-doped fiber ring laser and current modulated DFB laser are adopted. The modulated laser pulses launched into the FBG-FP cavity produce a group of reflected pulses. The optical loss in the cavity can be determined from the power ratio of the first two pulses reflected from the cavity. This technique does not require high reflectivity FBGs and is immune to the power fluctuation of the light source. Two short pulse laser sources were compared experimentally with each other on pulse width, pulse stability, pulse chirp and sensing efficiency.

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Fangfang Gao, Jianfeng Chen, Yunqi Liu, and Tingyun Wang "Fiber Bragg grating Fabry-Perot cavity sensor based on pulse laser demodulation technique", Proc. SPIE 8307, Passive Components and Fiber-Based Devices VIII, 83072A (29 November 2011); https://doi.org/10.1117/12.905535

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