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Mitigation of optical fiber nonlinearity is an active research field in thearea of optical communications, due to the resulting marked improvement intransmission performance. Following the resurgence of optical coherentdetection, digital nonlinearity compensation (NLC) schemes such as digitalbackpropagation (DBP) and Volterra equalization have received much attention.Alternatively, optical NLC, and specifically optical phase conjugation (OPC),has been proposed to relax the digital signal processing complexity. In thiswork, a novel hybrid optical-digital NLC scheme combining OPC and a Volterraequalizer is proposed, termed Volterra-Assisted OPC (VAO). It has a twofoldadvantage: it overcomes the OPC limitation in asymmetric links andsubstantially enhances the performance of Volterra equalizers. The proposedscheme is shown to outperform both OPC and Volterra equalization alone by up to4.2 dB in a 1000 km EDFA-amplified fiber link. Moreover, VAO is alsodemonstrated to be very robust when applied to long-transmission distances,with a 2.5 dB gain over OPC-only systems at 3000 km. VAO combines theadvantages of both optical and digital NLC offering a promising trade-offbetween performance and complexity for future high-speed optical communicationsystems.

Volterra-assisted Optical Phase Conjugation: a Hybrid Optical-Digital Scheme For Fiber Nonlinearity Compensation