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We carried out a simulation-based study assessing the performance of WDM direct-detection dispersion pre-compensated single-sideband (SSB) Nyquist-pulse-shaped QAM subcarrier modulated (N-SCM) systems using a receiver-based signal-signal beat interference (SSBI) cancellation technique. The performance improvement with SSBI cancellation, which compensates for the nonlinear distortion caused by square-law...
Nyquist-WDM PDM-QPSK transmission over standard SMF-28 fibre with novel distributed URFL amplification is reported for the first time. Transmission over 6157 km in a recirculating loop, and 320 km in an unrepeatered link without a ROPA were demonstrated.
A robust baud-rate estimation technique that is integrated into a coherent receiver prior to digital equalization and intermediate frequency estimation based on the standard deviation of the signal spectrum is presented. It is shown to operate from 4 to 25 GBaud QPSK signals with a maximum estimation error of 2% at the FEC limit of 3.8·10−3.
We propose and experimentally assess SSB SCM quasi-Nyquist QPSK for spectrally-efficient direct detection links. Nine channel 10.7 GHz-spaced WDM signal generation at 14 Gb/s per channel is demonstrated with a subcarrier frequency of 5.25 GHz.
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