Narrowing Brillouin gain spectrum for distortion-free Brillouin optical time-domain analyzers

Xizi Sun; Xiaobin Hong; Sheng Wang; Jian Wu; Yan Li

doi:10.1117/1.OE.57.6.066104

6 June 2018 Narrowing Brillouin gain spectrum for distortion-free Brillouin optical time-domain analyzers

Xizi Sun, Xiaobin Hong, Sheng Wang, Jian Wu, Yan Li

Author Affiliations +

Optical Engineering, Vol. 57, Issue 6, 066104 (June 2018). https://doi.org/10.1117/1.OE.57.6.066104

Abstract

A high-performance Brillouin optical time-domain analysis (BOTDA) is achieved using the Brillouin gain bandwidth reduction technique combined with high injected probe power. In the probe branch, dual-tone probe wave with fixed frequency separation is used for enhancing the probe power to +5 dBm. In the pump branch, a differential π-phase-shift long-pulse width pair is used to narrow the Brillouin gain spectrum. On the basis of high probe power and 2.5-m spatial resolution, the Brillouin gain spectrum can be narrowed to a level of 17 MHz, whereas the Brillouin gain spectrum of conventional single-pulse BOTDA sensor is 51 MHz. As a result, 50-km sensing range with 2.5-m spatial resolution and 1.1-MHz Brillouin frequency shift (BFS) accuracy has been achieved. Meanwhile, the narrowed Brillouin gain spectrum can give rise to sharp rising/falling edge in the BFS profile when the hot spots are introduced, which increases the detection robustness of the small temperature/strain change in the BOTDA system.

Citation Download Citation

Xizi Sun, Xiaobin Hong, Sheng Wang, Jian Wu, and Yan Li "Narrowing Brillouin gain spectrum for distortion-free Brillouin optical time-domain analyzers," Optical Engineering 57(6), 066104 (6 June 2018). https://doi.org/10.1117/1.OE.57.6.066104

Received: 10 January 2018; Accepted: 7 May 2018; Published: 6 June 2018

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