A single-polarisation single-mode (SPSM) fibre with crosstalk of −40 dB in a 3.2 km length has been demonstrated. No crosstalk degradation was found for lengths of more than 0.2 km. The two polarisations of the fundamental mode were split with a high modal birefringence of 8.5×10−4, which was produced by PANDA structure. The transmission loss was 2.8 dB/km at 1.56 μm.
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Hosaka et al. (1985) studied this question.
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