Method for the detection of polarization couplings in a birefrin

Details Method for the detection of polarization couplings in a birefrin Method for the detection of polarization couplings in a birefrin

1988-03-10

1990-01-16

Willis, Davis L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356 731, 356345, G01B 902

Patent

active

048939315

ABSTRACT:
A method for the detection of localized polarization couplings in a birefringent guided optical system uses a polarizer, at 45.degree. with respect to the axes of the optical system placed at its output, and followed by a Michelson type interferometer in which one of the optical paths has a variable length. When the length of an optical path undergoes variation, interference fringes appear on half of the energy emitted. The difference in the length of the optical paths when fringes of this type appear characterizes the position of a localized polarization coupling, and the contrast between the fringes measured for this difference in length characterizes the amplitude ratio between the primary wave and the coupled wave. The invention can be applied in particular, to the assembly of the components of a birefringent optical system.

REFERENCES:
Shibata et al., "Polarization Mode Dispersion Measurement in Elliptical Core Single-Mode Fibers by a Spatial Technique", IEEE J. Quant. Elec., vol. QE-18, No. 1, pp. 53-58, 1/82.
Patent Abstracts of Japan, vol. 9, No. 320 (P-413)[2043], 14 Dec. 1985; & JP-A-60 147 627 (Nippon Denshin Denwa Kosha) 03-08-1985.
Applied Optics, vol. 19, No. 9, ler mai 1980, pp. 1489-1492, Optical Society of America, New York, US; N. Shibata et al.: "Spatial Technique for Measuring Modal Delay Differences in a Dual-Mode Optical Fiber".

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