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Previous investigations have revealed that the impairments of the cross-phase modulation (XPM) in dense wavelength-division multiplexing (DWDM) systems include two aspects: the XPM-induced phase noise and the XPM-induced polarization scattering. Such XPM phenomena are strongly dependent on the transmission system configurations and are nonintuitive. In this paper, a simple fiber model is proposed...
Dependencies on segment number, dispersion map, and fibre launched power were investigated experimentally and numerically. Uncompensated 25 spans standard SMF link can enjoy net Q gain of 1.7 dB with 25 segments compensation.
A novel nonlinear compensation scheme is proposed and demonstrated with 112 Gb/s DP-QPSK format using digital coherent receiver. The Q-improvement by the proposed scheme exceeded 2 dB after 20 span (1200 km) transmission.
A novel frequency offset estimator is proposed and implemented in a 1 Gbit/s real-time coherent receiver to demonstrate all-digital frequency offset compensation up to plusmn0.4 symbol rate.
We present a novel method to monitor and adaptively optimize digital carrier phase estimation in optical coherent receivers. This guarantees the optimal performance irrespective of the differences and changes in devices and transmission channels.
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