Deformation of the Brillouin Gain Spectrum Caused by Parabolic Strain Distribution and Resulting Measurement Error in BOTDR Strain Measurement System

Hiroshi NARUSE  Mitsuhiro TATEDA  Hiroshige OHNO  Akiyoshi SHIMADA  

IEICE TRANSACTIONS on Electronics   Vol.E86-C   No.10   pp.2111-2121
Publication Date: 2003/10/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Optoelectronics
Brillouin scattering,  parabolic strain distribution,  strain measurement,  power spectrum,  error analysis,  

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In an optical time domain reflectometer type strain measurement system, we theoretically derive the shape of the Brillouin gain spectrum produced in an optical fiber under a parabolic strain distribution which is formed in a uniformly loaded beam. Based on the derived result, we investigate the effects of the parabolic strain distribution parameters and the measurement conditions such as the launched pulse width and the measurement position on the beam on the deformation of the Brillouin backscattered-light power spectrum shape. In addition, we investigate the strain measurement error resulting from the deformation of the power spectrum shape by analyzing the peak-power frequency at which the power spectrum is maximized.