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The limitation of transmission distance imposed by Raman crosstalk in a high-density WDM system is numerically analysed. The authors introduce a post-transmitter fibre Raman amplifier to relax this limitation. The examples show that the limitation can be relaxed by 7 dB and 15 dB amplifier gain is obtainable. In addition, a much lower transmitted power level can be used to obtain the maximum transmission distance.
Date of Publication: 12 Oct. 1989