Apparatus and method for minimizing polarization-induced signal

Optics: measuring and testing – By particle light scattering – With photocell detection

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356351, 25022717, G01B 902

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active

049327836

ABSTRACT:
An apparatus for minimizing polarization-induced signal fading in an interferometric fiber-optic sensor is disclosed. The apparatus includes an optical source for providing an input light beam, a polarization modulator for modulating the state of polarization of the input light beam into at least three states represented by mutually perpendicular polarization vectors on a Poincare Sphere. The apparatus further includes means for conveying the input light beam with the at least three mutually perpendicular modulated states of polarization to the fiber-optic sensor, the interferometric fiber-optic sensor being responsive to the input light beam with modulated polarization states for developing an interference pattern output, wherein the interference pattern output has at least three visibilities corresponding to the input states of polarization. A photodetector is responsive to the interference pattern output for developing an electrical signal having at least three amplitudes corresponding to the at least three states of polarization. An output circuit is responsive to the electrical photodetector signal for time-sampling the photodetector signal having three amplitudes corresponding to the at least three mutually perpendicular input states of polarization and selecting the one having maximum visibility. A method for minimizing polarization-induced signal fading is also disclosed.

REFERENCES:
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patent: 4729622 (1988-03-01), Paviath
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Kersey et al. "Input Polarisation Effects on Inteferometric Fibre Sensors", Fibre Optics '88, Abstracts of Papers Day 3, 6th International Conference, London 26-28 Apr. 1988.
Kersey et al. "Optimization and Stabilization of Visibility in Interferometric Fiber-Optic Sensors Using Input-Polarization Control", J. of Lightwave Tech., vol. 6, No. 10, Oct. 1988, pp. 1599-1609.
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Kersey et al. "Dependence of Visibility on Input Polarization in Interferometric Fiber-Optic Sensors", Optics Letters, vol. 13, Apr. 1988, pp. 288-290.
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