Performance Improvement of Brillouin Ring Laser based BOTDR System Employing a Wavelength Diversity Technique

Lalam, Nageswara, Ng, Wai Pang, Dai, Xuewu, Wu, Qiang and Fu, Yong Qing (2017) Performance Improvement of Brillouin Ring Laser based BOTDR System Employing a Wavelength Diversity Technique. Journal of Lightwave Technology. ISSN 0733-8724 (In Press)

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Official URL: https://doi.org/10.1109/JLT.2017.2766765

Abstract

In this paper, a wavelength diversity technique is employed in a Brillouin optical time domain reflectometry (BOTDR) using a Brillouin ring laser (BRL) as a local oscillator. In the wavelength diversity technique, multiple wavelengths are injected into the sensing fiber, while the peak power of each wavelength is set below the nonlinear threshold level. This technique significantly maximizes the overall launch pump power, without activating the non-negligible nonlinear effects, which overcomes the limitation of the conventional BOTDR system. The BRL, which is simple and cost-effective, that can be used to reduce the receiver bandwidth in the order of few MHz. In addition, a passive depolarizer is used to reduce the polarization noise. The proposed system is validated experimentally over a 50 km sensing fiber with a 5 m spatial resolution. The experimental results demonstrate a signal-to-noise ratio improvement of 5.1 dB, which corresponds to 180% improvement compared to a conventional BOTDR system.

Item Type: Article
Uncontrolled Keywords: Wavelength diversity, distributed fibre sensors, Brillouin scattering
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 27 Nov 2017 15:12
Last Modified: 27 Nov 2017 18:37
URI: http://nrl.northumbria.ac.uk/id/eprint/32647

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