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Differential pulse-width pair BOTDA for high spatial resolution sensing.

Authors
  • Li, Wenhai
  • Bao, Xiaoyi
  • Li, Yun
  • Chen, Liang
Type
Published Article
Journal
Optics Express
Publisher
The Optical Society
Publication Date
Dec 22, 2008
Volume
16
Issue
26
Pages
21616–21625
Identifiers
PMID: 19104593
Source
Medline
License
Unknown

Abstract

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.

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