Over 350 km CPFSK repeaterless transmission at 2.5 Gbit/s employing high-output power erbium-doped fibre amplifiers

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Abstract
A 351.4 km CPFSK repeaterless transmission at 2.5 Gbit/s is described, which uses a newly developed post amplifier consisting of two erbium-doped fibres. Amplifier output power of +18.8 dBm and a maximum allowable attenuation as high as 63.8 dB in the optical link were achieved.