Impact of Raman amplification on a 2 Tb/s coherent WDM system

Paola Frascella, Cleitus Antony, Simon J. Fabbri, Fatima C. Garcia Gunning, Paul Gunning, William McAuliffe, Derek Cassidy, Andrew D. Ellis

    Research output: Contribution to journalArticlepeer-review


    The impact of hybrid erbium-doped fiber amplifier (EDFA)/Raman amplification on a spectrally efficient coherent-wavelength-division-multiplexed (CoWDM) optical communication system is experimentally studied and modeled. Simulations suggested that 23-dB Raman gain over an unrepeatered span of 124 km single-mode fiber would allow a decrease of the mean input power of ~6 dB for a fixed bit-error rate (BER). Experimentally we demonstrated 1.2-dB Q-factor improvement for a 2-Tb/s seven-band CoWDM with backward Raman amplification. The system delivered an optical signal-to-noise ratio of 35 dB at the output of the receiver preamplifier providing a worst-case BER of 2 × 10 -6 over 49 subcarriers at 42.8 Gbaud, leaving a system margin (in terms of Q -factor) of ~4 dB from the forward-error correction threshold.
    Original languageEnglish
    Article number5756219
    Pages (from-to)959-961
    Number of pages3
    JournalIEEE Photonics Technology Letters
    Issue number14
    Publication statusPublished - 25 Apr 2011

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    • coherent wavelength-division multiplexing
    • Raman amplification


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