We review recent progresses on the use of twin-wave-based diversity schemes to enhance optical transmission performances in both nonlinear and linear regimes. Phase-conjugated twin waves with and without spectral redundancy are presented. The implications to perturbation-based fiber nonlinearity compensation are discussed. Performance enhancement techniques for real-valued orthogonal frequency-division multiplexed (OFDM) signals with a built-in Hermitian symmetry, as well as positive-valued OFDM twin signals suitable for cost-effective intensity modulation and direct detection, are also discussed.
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Xiang Liu (2014) studied this question.
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