Efficient Fiber Nonlinearity Mitigation in 50-GHz-DWDM Transmission of 256-Gb/s PDM-16QAM Signals by Folded Digital-Back-Propagation and Channelized FBG-DCMs

Phase-sensitive amplifier link with distributed Raman amplification

“…This leads us to believe that there are significant penalties impacting the efficiency of the nonlinearity mitigation due to various nonidealities beyond our control in the presented experiment. One important feature of the experiment is that we are using channelized tunable DCMs based on FBG technology [17]. The advantage of using these is that we can perform the dispersion map optimization experimentally and do not need to rely on numerical simulations for finding the optimal dispersion map.…”

“…Since the pump recovery stage was based on injection locking, the pump wave was also transmitted alongside the In order to achieve phase-sensitive amplification in the FOPA, the transmission span needs to be fully dispersion-compensated. This was achieved using tunable channelized fiber Bragg grating (FBG)-based dispersion compensating modules (DCMs) before and after the transmission span [17]. The ratio between dispersion pre-and post-compensation was optimized for each amplifier configuration in order to maximize the transmission reach in a nonlinear transmission regime.…”

Multi-channel nonlinearity compensation of PDM-QPSK signals in dispersion-managed transmission using dispersion-folded digital backward propagation

“…To increase the gain of NLC in the presence of many WDM channels, two approaches can be considered. First, optical inter-channel nonlinearity mitigation scheme based on periodicgroup-delay dispersion-compensation [12][13][14] can be employed to suppress the nonlinear interactions from other WDM channels. Second, the inter-channel NLC bandwidth can be increased to include more neighboring channels using either full-field compensation or selective nonlinearity compensation that does not require phase locking in detecting WDM channels [15].…”