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A new technique, using fibre-Bragg gratings with different centre frequencies to reflect the different channel signals at different positions, is proposed for flattening the gain spectrum of an erbium-doped fibre amplifier. A designed gain excursion of < 0.1 dB can be achieved for 16 channel multiplexed signals with 0.1 mW input power in the 1532 – 1562 nm wavelength region.
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Dung et al. (1998) studied this question.
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