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We investigated phase modulation on nonlinear discrete spectrum for Nonlinear Frequency Division Multiplexed transmissions and characterized the effects of filtering, launched power fluctuations and laser phase noise on system performance.
A novel low-complexity two-stage digital feed-forward carrier phase estimation algorithm based on the rotation of constellation points to remove phase modulation for a 64-ary quadrature amplitude modulation (QAM) system is proposed and analyzed both experimentally and through numerical simulations. The first stage is composed of a Viterbi and Viterbi (V&V) block, based on either the standard quadrature...
A cycle-slip resilient pilot-aided carrier phase estimation that achieves 4000km transmission is proposed for 16-QAM systems. We demonstrate that fast phase transition induced by ASE and nonlinear distortions are the main reasons of cycle-slips.
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