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A new demodulation technique for optical fiber interferometric sensors with [3×3] directional couplers
Authors:Tingting Liu  Jie Cui  Desheng Chen  Ling Xiao  Dexing Sun
Institution:Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080
Abstract:2Optical fiber interferometric sensors based on 3 × 3] couplers have been used in many fields. A new technique is proposed to demodulate output signals of this kind of sensors. The technique recovers the signal of interest by fitting coefficients of elliptic (Lissajous) curves between each fiber pair. Different from other approaches, this technique eliminates the dependence on the idealization of 3 × 3] coupler, provides enhanced tolerance to the variance of photoelectric converters, and is anti-polarization in a certain extent. The main algorithm has been successfully demonstrated both by numerical simulation and experimental result.
Keywords:sensors  optical fiber  new technique  demodulation  couplers  algorithm  numerical simulation  experimental  result  extent  tolerance  variance  converters  dependence  idealization  Different  curves  pair  signals  interest
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