Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 31, Issue 1, Pages 58-66Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2012.2227942
Keywords
Coherent optical orthogonal frequency-division multiplexing (CO-OFDM) systems; mid-span spectral inversion (MSSI); optical phase conjugation (OPC); Kerr nonlinearity
Funding
- Australian Research Council Centre of Excellence for Ultrahigh Bandwidth Devices for Optical Systems [CE110001018]
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We develop a theoretical expression to predict the ultimate back-to-back performance of coherent optical orthogonal frequency-division multiplexing (CO-OFDM) systems that rely on four-wave mixing to achieve phase conjugation for mid-span spectral inversion. Our analysis shows that two different two-stage nonlinear processes produce strong noise-like products in the conjugated signal band. We verify our theoretical results with simulations and experiments; these both show excellent agreement with the analytical theory. We identify the optimal design parameters and predict that optical phase conjugation of 10 THz wide orthogonal frequency-division multiplexing signals could be possible, given appropriate dispersion management of the nonlinear element. We also experimentally demonstrate the benefit of MSSI in an 800 km transmission of CO-OFDM.
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