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One stage per span is commonly considered as the lower boundary for implementation complexity of nonlinear equalizer based on digital backpropagation. The proposed method overcomes this boundary and improves the efficiency by about four times.
Complex interaction among optical signal distortions, analog component characteristics, and digital signal processing algorithms can give rise to significant performance degradation in the coherent system performance. Two topics are introduced as examples of such phenomena.
We propose a digital clock recovery algorithm and demonstrate its tolerance to at least 5 GHz laser frequency mismatch in a 43 Gb/s DP-RZ-QPSK receiver after 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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