A flexibly-tunable multi-wavelength Raman fibre laser based on the polarisation maintaining fibre (PMF) Lyot-Sagnac filter after composing fibre Bragg grating cavity is demonstrated experimentally. The number of channels and wavelength spacing of the Raman laser can be controlled readily by Δn · L products of PMF segments in the intracavity PMF Lyot-Sagnac filter.
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Han et al. (2004) studied this question.
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