A polarisation-preserving single-mode-fibre coupler made by an etch-fusion technique with Hitachi single-polarisation fibre is reported. Polarisation isolation of 10–20 dB is typically maintained through the coupler. Power division of ̃ 45–55% is achieved with an excess loss of 0.2 dB.
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Villarruel et al. (1983) studied this question.
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