A novel three-stage amplification configuration with two intermediate gain equalisers is proposed to enlarge the bandwidth of erbium-doped fibre amplifiers. Seamless 3 dB gain bandwidths of 57 nm (1550–1607 nm) with an erbium-doped silica fibre amplifier and 62 nm (1540.5–1602.5 nm) with an erbium-doped fluoride fibre amplifier have been achieved with this configuration.
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Masuda et al. (1998) studied this question.
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