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The roles of ADC ENOB and AGC clipping effect are investigated in coherent QAM optical transmission system by experiments and simulations, under different transmission effects. Potential implementation risks and optimization for AGC and ADC are presented.
We investigate the performance of linear equalization combined with MLSE in long-haul transmission. In the nonlinear regime with high launch powers Q-factor improvement up to 1.4 dB is demonstrated with a quaternary state model.
We investigate the performance of digital backpropagation in wavelength-division-multiplexed- (WDM) transmission systems using polarisation-division-multiplexed (PDM) differentially-encoded quadrature phase shift keying (QPSK) and 16-quadrature amplitude modulation (16QAM) for a range of symbol-rates. Digital backpropagation was found to be more effective for the 16QAM than QPSK format.
We investigate the dependence of nonlinear penalty on symbol-rate in polarisation-multiplexed coherent DQPSK WDM-transmission systems over an uncompensated SSMF link with a fixed spectral efficiency of 2 bit/s/Hz. The performance is found to be similar, irrespective of the symbol-rate.
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