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We report here an inherently gain-flattened, high-gain discrete Raman fiber amplifier design with 21dB net gain (±1.4dB gain ripple) over 25nm bandwidth. The amplifier design is based on a W-shape highly nonlinear fiber, in which, optimized spectral variation of leakage loss has been used to achieve inherent gain flattening of Raman gain. The proposed fiber has an additional advantage of having a...
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