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.
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- coherent wavelength-division multiplexing
- Raman amplification
Frascella, P., Antony, C., Fabbri, S. J., Garcia Gunning, F. C., Gunning, P., McAuliffe, W., Cassidy, D., & Ellis, A. D. (2011). Impact of Raman amplification on a 2 Tb/s coherent WDM system. IEEE Photonics Technology Letters, 23(14), 959-961. . https://doi.org/10.1109/LPT.2011.2147299