Nonlinearity mitigation by optical phase conjugation

Abstract

As the demand for high data rates in optical fibre communication systems grows at an unprecedented speed, nonlinearity compensation of wavelength-division multiplexing (WDM) signals with advanced modulation formats is a key challenge for optical transmission. Nonlinearity compensation by optical means such as mid-link opticalphase conjugation (OPC) offers bit rate and modulation format transparency, and more importantly the capability of handling wideband WDM signals or densely packed superchannels simultaneously. In this project, a bandwidth-efficient polarisation-insensitive fibre optical parametric amplifier (FOPA) -based OPC scheme has been proposed and implemented, and its performance as a nonlinearity compensation (NLC) device has been tested experimentally using a variety of modulation formats and number of channels. Mid-link OPC ideally requires link symmetry about the OPC module in order to provide optimal NLC efficiency. Mostly based on lumped amplification and single-mode fibres, practical link conditions lack symmetry. Investigations on the potential of applying midlink OPC to these practical links are of great interest. In the experiments presented in the thesis, the implemented OPC module was placed in a field-installed transmission system with varied link conditions using several types of transmitted signals. For dispersionmanaged and dispersion uncompensated links (having total lengths between 400 km and 800 km), Q factor improvements ranging between 3.0 dB and 0.5 dB, respectively, are reported. The experimental results have shown the great potential of OPC for NLC in real-world transmission systems

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Identifiers

ORCID for Yujia Sun: orcid.org/0000-0002-3783-6990

ORCID for Periklis Petropoulos: orcid.org/0000-0002-1576-8034

ORCID for Francesca Parmigiani: orcid.org/0000-0001-7784-2829

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