We describe direct Raman amplification by a CW pump of a distributed feedback semiconductor laser operating in the 1.5 μm low-loss region of a single-mode optical fibre, and at powers comparable to the spontaneous Raman scattering from the pump. A direct measure of the increase in receiver sensitivity from bit-error-rate measurements show an enhancement in the signal-to-noise ratio at these low signal powers.
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Hegarty et al. (1985) studied this question.
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