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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 demonstrate robust and precise frequency domain chromatic dispersion estimation based on offline data and simulations. The blind, least complexity algorithm allows fast acquisition suitable for digital coherent receivers in switched networks.
Experimentally measured and theoretically deduced model of ENOB of ADC in digital coherent receivers is demonstrated. ENOB impacts on performance of 112 Gbps polarization multiplexed QPSK systems in linear and nonlinear regimes are investigated.
The low complexity, robust, and precise algorithm solely employs a simplified autocorrelation function of the signal spectrum for blind chromatic dispersion estimation to adapt frequency domain compensation functions in digital coherent receivers.
8 times 107 Gbit/s DWDM transmission is achieved over a 500 km field installed fibre link in the Deutsche Telekom network, indicating high link utilization of 1 bit/s/Hz spectral efficiency, needed for Terabit/s network capacity, required in a mid-term timeframe.
PMD compensation for 40 Gb/s Apol RZ-DPSK is successfully demonstrated using different feedback methods. Eye-opening feedback exhibits the lowest penalty. Experiments indicate a mean PMD tolerance of 5.3 ps for an outage probability of 10-5.
A lower bound and the union upper bound of the bit error rate (BER) of the maximum-likelihood (ML) receiver of an optical on/off-keying (OOK) system is derived in this paper. Combining the two bounds, the BER of the ML receiver can be estimated
We propose a multichannel PMD mitigation scheme using forward-error-correction (FEC) and distributed fast polarization scramblers that randomize PMD during each FEC burst-error-correcting-period. Numerical evaluations show substantial improvement in PMD tolerance and reduction in outage probability.
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