Benefits provided by higher order bidirectional Raman pumping schemes in 10-Gb/s unrepeated wavelength-division-multiplexing transmission systems are experimentally quantified in terms of BER performances at 10 Gb/s. By keeping under control double-Rayleigh-scattering-noise-induced transmission penalties, which can degrade system performance at very high ON-OFF Raman gain, as well as nonlinear propagation effects such as Brillouin scattering, self-and cross-phase modulations, four-wave-mixing, and Raman-induced crosstalks, we show a total unrepeated system reach enhancement up to 3.5 dB with respect to first-order bidirectional pumping. As confirmed by theory, the maximum reach enhancement is mainly limited by pump-to-signal relative intensity noise transfer induced by higher order copumping.
© 2005 IEEE
Stefano Faralli, Gabriele Bolognini, Giovanni Sacchi, Simone Sugliani, and Fabrizio Di Pasquale, "Bidirectional Higher Order Cascaded Raman Amplification Benefits for 10-Gb/s WDM Unrepeated Transmission Systems," J. Lightwave Technol. 23, 2427- (2005)