Open AccessDifferential pulse-width pair BOTDA for high spatial resolution sensing
Author(s) -
Wenhai Li,
Xiaoyi Bao,
Yun Li,
Liang Chen
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.021616
Subject(s) - optics , brillouin zone , brillouin scattering , pulse (music) , image resolution , time domain , physics , pulse width modulation , waveform , optical fiber , materials science , computer science , quantum mechanics , voltage , detector , computer vision
A differential pulse-width pair Brillouin optical time domain analysis (DPP-BOTDA) for centimeter spatial resolution sensing using meter equivalent pulses is proposed. This scheme uses the time domain waveform subtraction at the same scanned Brillouin frequency obtained from pulse lights with different pulse-widths (e.g. 50ns and 49ns) to form the differential Brillouin gain spectrum (BGS) at each fiber location. The spatial resolution is defined by the average of the rise and fall time equivalent fiber length for a small stress section rather than the pulse-width difference equivalent length. The spatial resolution of 0.18m for the 50/49ns pulse pair and 0.15m for 20/19ns pulse pair over 1km sensing length with Brillouin frequency shift accuracy of 2.6MHz are demonstrated.