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Erbium-doped fiber amplifier cascade for multichannel coherent optical transmission

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5 Author(s)
Walker, G.R. ; British Telecom Res. Labs., Ipswich, UK ; Walker, N.G. ; Steele, R.C. ; Creaner, M.J.
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The requirements and practicalities of amplifier cascades for multichannel coherent transmission are discussed. A four-amplifier cascade which maintains an overall noise figure of less than 13 dB across a 20-nm optical bandwidth for total input powers up to -10 dBm is described. A potential capacity of 100 wavelength division multiplexing channels is demonstrated in a 300-km 622-Mb/s DPSK (differential phase shift keying) coherent transmission experiment

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Lightwave Technology, Journal of  (Volume:9 ,  Issue: 2 )