An extremely large seamless flat-gain bandwidth of 90.5 nm (1556.0 – 1646.5 nm) and transparent-gain bandwidth of 108 nm (1540.0 – 1648.0 nm) for a 50 km transmission fibre are achieved using a novel hybrid amplifier. The amplifier comprises a low-noise distributed Raman amplifier pumped with dual wavelengths and an erbium-doped fluoride fibre amplifier.
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Masuda et al. (1998) studied this question.
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