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Polarization averaged short-time Fourier transform technique for distributed fiber birefringence characterization using Brillouin gain.

Authors
  • Xie, Shangran1
  • Chen, Liang
  • Bao, Xiaoyi
  • 1 Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, Ontario K1N6N5, Canada. , (Canada)
Type
Published Article
Journal
Applied Optics
Publisher
The Optical Society
Publication Date
Jul 01, 2012
Volume
51
Issue
19
Pages
4359–4369
Identifiers
DOI: 10.1364/AO.51.004359
PMID: 22772108
Source
Medline
License
Unknown

Abstract

A polarization averaged short-time Fourier transform (PASTFT) technique is developed for distributed fiber birefringence characterization based on counterpropagating stimulated Brillouin scattering (SBS) gain signal. This technique can be used for the birefringence characterization of the general elliptical birefringent fiber. A theoretical model on polarization matching of counterpropagating SBS process is established. The performance of the short-time Fourier transform (STFT) method and the PASTFT technique is analyzed by using the simulation of the theoretical model. Simulation results show that the process of polarization average could effectively reduce the birefringence characterization error caused by the polarization dependence of the local period of SBS gain. A less than 8% normalized root mean square error is achieved for the characterization of the length of the birefringence vector on elliptical birefringent fibers. The PASTFT technique is experimentally verified by the distributed measurement of beat length and differential group delay of a standard single-mode fiber via the Brillouin optical time domain analysis system.

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