title: Mitigation of intra-channel nonlinearities using a frequency-domain Volterra series equalizer.
abstract: We address the issue of intra-channel nonlinear compensation using a Volterra series nonlinear equalizer based on an analytical closed-form solution for the 3rd order Volterra kernel in frequency-domain. The performance of the method is investigated through numerical simulations for a single-channel optical system using a 20 Gbaud NRZ-QPSK test signal propagated over 1600 km of both standard single-mode fiber and non-zero dispersion shifted fiber. We carry on performance and computational effort comparisons with the well-known backward propagation split-step Fourier (BP-SSF) method. The alias-free frequency-domain implementation of the Volterra series nonlinear equalizer makes it an attractive approach to work at low sampling rates, enabling to surpass the maximum performance of BP-SSF at 2× oversampling. Linear and nonlinear equalization can be treated independently, providing more flexibility to the equalization subsystem. The parallel structure of the algorithm is also a key advantage in terms of real-time implementation.
authors.affiliation: Department of Electronics, Telecommunications and Informatics, University of Aveiro, Aveiro, Portugal. guiomar@av.it.pt
authors.forename: Fernando P
authors.initials: FP
authors.lastname: Guiomar
authors.forename: Jacklyn D
authors.initials: JD
authors.lastname: Reis
authors.forename: António L
authors.initials: AL
authors.lastname: Teixeira
authors.forename: Armando N
authors.initials: AN
authors.lastname: Pinto
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D004867:Equipment Design; D005336:Fiber Optic Technology / Q000295:instrumentation* / Q000379:methods*; D016014:Linear Models; D017711:Nonlinear Dynamics; D055100:Optical Fibers