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We investigate the impact of pulse shaping by numerical simulation of 127Gbit/s DP-QPSK transmission with RZ, NRZ and Nyquist pulse formats. The transmitter analog bandwidth is found critical for the latter two cases.
Conventional Gardner clock recovery method fails on Nyquist signal with sinc pulse shape. A novel algorithm is proposed and verified by experiment. It has lower timing jitter, and its tolerance to various distortions is investigated.
We propose a low complexity intra-channel nonlinearity pre-distortion method based on symbol rate operation. The method is experimentally verified under a 43Gb/s DP-QPSK coherent system, and the performance is comparable with back-propagation method.
We demonstrate that the interplay between local oscillator phase noise and electrical chromatic dispersion compensation induces timing jitter as well as intensity noise. The interplay is investigated in 3000 km-long transmission (accumulated dispersion of 47,000 ps/nm) without optical dispersion compensation.
We propose a novel group delay management technique which effectively suppresses XPM accumulation in hybrid 10G/40G/100G DWDM networks. Systematic investigation reveals its high effectiveness for various co-propagating signals, dispersion maps and fiber types.
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.
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