Abstract

Improving the efficacy of optical phase conjugation (OPC) for compensating nonlinear signal distortion in long distance optical fiber links from the Kerr effect is demonstrated. This is based on tailoring the link spans as step-parameter profiled fiber (SPF) for progressively increasing nonlinearity and decreasing dispersion with distance to mitigate the impact of propagation loss on unbalancing the phase distortion induced before and after OPC. With addition of a dispersion element after OPC, the SPF design also targets compensation in a shorter subsection of spans where induced nonlinear distortion is strongest. This enables performance benefit with less required parameter change in spans comprising just two or three segments of different regular fibers as 2-SPF and 3-SPF, respectively. Numerical simulations of 5 channel WDM dual polarization (DP) 32 Gbaud 64-QAM signals in a 12 × 130 km fiber link shows use of OPC and a 58 km 3-SPF in spans achieves 2.1 dB higher Q2-factor at 5 dB higher launch power than without. Similarly, measurements of 5 channel WDM DP 12 Gbaud 16-QAM signals in a 2 × 155 km link shows use of OPC and a 41 km 2-SPF in spans achieves 1.2 dB higher Q2-factor at 6 dB higher launch power and with low bit error rate compared to without. The improvements highlight the OPC advancements achievable by link design with regular fibers.

Optically tunable compensation of nonlinear signal distortion in optical fiber by end-span optical phase conjugation

Mark D. Pelusi and Benjamin J. Eggleton
Opt. Express 20(7) 8015-8023 (2012)

Fiber nonlinearity mitigation of WDM-PDM QPSK/16-QAM signals using fiber-optic parametric amplifiers based multiple optical phase conjugations

Hao Hu, Robert M. Jopson, Alan H. Gnauck, Sebastian Randel, and S. Chandrasekhar
Opt. Express 25(3) 1618-1628 (2017)

Compensation of SOA-induced nonlinear phase distortions by optical phase conjugation

Aneesh Sobhanan, Mark Pelusi, Takashi Inoue, Deepa Venkitesh, and Shu Namiki
Opt. Express 29(8) 12252-12265 (2021)

Multichannel nonlinear distortion compensation using optical phase conjugation in a silicon nanowire

Dragana Vukovic, Jochen Schröder, Francesco Da Ros, Liang Bangyuan Du, Chang Joon Chae, Duk-Yong Choi, Mark D. Pelusi, and Christophe Peucheret
Opt. Express 23(3) 3640-3646 (2015)

Optical back propagation for compensating nonlinear impairments in fiber optic links with ROADMs

Xiaojun Liang and Shiva Kumar
Opt. Express 24(20) 22682-22692 (2016)