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The letter reports very efficient Raman generation and polarisation switching effects in a high-germania-content optical fibre, with a small 2μm2 core area. 10 dB Raman amplification has been observed in 5 m of fibre at a pump power of 2W. The Raman emission is only generated along the birefringence axes of the fibre.
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Davison et al. (1987) studied this question.
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