Narrowing Brillouin gain spectrum for BOTDA sensor

Wenqiao Lin; Zhisheng Yang; Xiaobin Hong; Sheng Wang; Jian Wu

doi:10.1117/12.2267646

23 April 2017 Narrowing Brillouin gain spectrum for BOTDA sensor

Wenqiao Lin, Zhisheng Yang, Xiaobin Hong, Sheng Wang, Jian Wu

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103239K (2017) https://doi.org/10.1117/12.2267646
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

A novel BOTDA method based on differential ∏-phase-shift-pulse pair is proposed for narrowing the Brillouin gain spectrum. Theoretical analysis and experimental results demonstrate that the proposal could achieve 17 MHz Brillouin gain spectrum linewidth with a fixed spatial resolution of 2.5 m. The Brillouin gain spectrum linewidth is 3 times narrower than that obtained using conventional single-pulse based BOTDA method with same spatial resolution, resulting in √3 times frequency accuracy improvement. Furthermore, the sharper rising/falling edge of the Brillouin frequency shift profile resulting from the narrowed Brillouin gain spectrum could obtain more precise temperature/strain information along the fiber.

Citation Download Citation

Wenqiao Lin, Zhisheng Yang, Xiaobin Hong, Sheng Wang, and Jian Wu "Narrowing Brillouin gain spectrum for BOTDA sensor", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103239K (23 April 2017); https://doi.org/10.1117/12.2267646

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