Transmission of Mixed 224-Gb/s and 112-Gb/s PDM-QPSK at 50-GHz Channel Spacing Over 1200-km Dispersion-Managed LEAF® Spans and Three ROADMs

Mitigation of inter-channel nonlinear interference in WDM systems

“…Therefore, a system with lumped amplifiers is the least amenable to NLIN mitigation. A practical compromise is a standard Raman amplified system, for example, of the kind demonstrated in [7]. As we show in this paper, the performance improvement that follows from NLIN mitigation in this case is quite notable.…”

“…More than 100 runs (each with independent and random data symbols) were performed with each set of system parameters, so as to accumulate sufficient statistics. In the Raman amplified cases, a combination of co-propagating and counterpropagating Raman pumps, providing gains of 5 dB and 15 dB, respectively, as in [7]. At the receiver, the channel of interest was isolated with a The ratio between the NLIN power before and after mitigation of the zeroth interference term H (n) 0 .…”

High Speed All Optical Nyquist Signal Generation and Full-band Coherent Detection

“…The bandwidth demand of the network data service continues to grow at around 30% to 60% per year, driven by more and more video streaming and proliferation of cloud computing, social media, and mobile data delivery in both long haul backbone and short haul optical networks 1 2 3 4 5 6 7 8 9 10 . Considering the requirement of cost reduction per bit per Hz, higher-speed underlying optical transmission interfaces and higher spectrum efficiency technology is becoming more and more important.…”