All-optical gain clamping in an erbium-doped fibre amplifier is demonstrate
d using a broadband fibre Bragg grating that reflects the amplified spontan
eous emission centred at 1530 nm with a 14 nm bandwidth. Experiments on an
eight-channel wavelength division multiplexing system show promise when the
gain is clamped at 21 dB. Gain flatness is less than 0.6 dB across all cha
nnels and gain variation is about 0.2 dB over the input signal power range.
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