An all-fibre polariser is demonstrated utilising the birefringent properties of a nematic liquid crystal having refractive indices compatible to that of fused silica. The polariser exhibits an extinction ratio in excess of −45dB and a loss of 0.2dB over a temperature range between 10 and 50°C. Design considerations to achieve a desired extinction ratio are also discussed.
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Ioannidis et al. (1988) studied this question.