volume | PIER Journals

Abstract

To increase the detection dynamic range of slope-assisted Brillouin optical time-domain analysis (SA-BOTDA) system, we propose a configuration using unbalanced frequency-shifted stokes and anti-stokes sidebands as continuous probe light simultaneously to expand the region of effective stimulated Brillouin scattering (SBS) spectrum existed in frequency domain. The proposed scheme fully utilizes unbalanced double sidebands' gain, loss and corresponding phase spectra, constructing linear regions by specific data processing methods and has pump power-independence characteristic. Besides, scheme of dual-frequency agile change is employed to broaden the linear region at the cost of detection speed. The dynamic detection range of the proposed system can be increased to over 180 MHz, with a spatial resolution of 3.5 m and 500 MHz sampling rate for vibration detection.

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Dr. Zijian Xiong

Dr. Shengnan Wu

Prof. Sailing He