title: Fiber nonlinearity compensation for OFDM super-channels using optical phase conjugation.
abstract: We experimentally demonstrate that mid-link optical phase conjugation (OPC) effectively compensates fiber nonlinearity in coherent optical OFDM super-channels. The OPC was produced by pump × subcarrier degenerate four-wave-mixing in a 1-km highly nonlinear fiber. The nonlinear threshold for the 10 × 80-km 604.7-Gb/s 16-QAM test system was increased by 4.8 dB. The performance at the optimum power was only improved by 0.2 dB because the OPC module produces a 1.6 dB penalty for the back-to-back system. FWM theory shows that the 'noise' processes of OPC modules utilizing χ3 nonlinearities could be reduced by increasing the pump power, which will improve back-to-back performance with the OPC module.
authors.affiliation: Centre for Ultrahigh bandwidth Devices for Optical Systems (CUDOS), Department of Electrical & Computer Systems Engineering, Monash University, Clayton, VIC 3800, Australia.
authors.forename: Liang B
authors.initials: LB
authors.lastname: Du
authors.forename: Mohammad Monir
authors.initials: MM
authors.lastname: Morshed
authors.forename: Arthur J
authors.initials: AJ
authors.lastname: Lowery
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D017711:Nonlinear Dynamics; D013685:Telecommunications / Q000295:instrumentation*