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Deals with presents the theoretical investigation into the influence of temperature on the fiber-optic interferometer action for different configuration of the latter. Based on the phenomenological description of interference phenomena in the optical fiber, the role of coherence and polarisation in the fiber-optic interferometer is discussed. The final conclusions are used in the main part of the paper connected with an analysis of temperature influence on the action of different fiber-optic interferometer configurations. This analysis is based on the Jones matrix formalism applied to interferometers of minimal functional configuration. Finally, it is suggested using the fiber-optic ellipsometer for polarisation controlling.
A demodulation system employing birefringent crystalline plates for decoding low-coherence interferometric sensors based on highly birefringent fibers was numerically analyzed in order to find its optimum construction. A numerical approach proposed allowed us to calculate how the parameters of the decoding system such as thickness and orientation of the crystalline plates, type of birefringent material, position of the detectors, and polarization characteristics of beam splitting plates influence the contrast of differential interference signals. Calculations were based on vectorial ray tracing algorithm applicable to isotropic as well as anisotropic media. The algorithm allowed determination of intersection coordinates with detector surface for ordinary and extraordinary rays, their phases, polarizations, and amplitudes, and finally the contrast of differential interference signals. Based on modeling results, general principles concerning system construction were formulated, which assure the highest possible contrast of interference signals and therefore maximum operation range of the sensor.
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