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We discuss several options for reducing power consumption of DSP used for coherent interfaces. These options are put in perspective with the needs of metro and data center interconnects for an overall optimized solution.
We compare hybrid turbo differential decoding with other FEC-schemes that reduce the penalty usually associated with differential encoding applied for cycle slip mitigation. We discuss implementation aspects and show robust FEC-performance in nonlinear transmission experiments.
We experimentally investigate the cycle slip tolerance of an enhanced Turbo Differential Decoding algorithm in nonlinear transmission. Error-free post-FEC measurements using a 100G QPSK DWDM module show excellent tolerance against cycle slips without a differential encoding penalty.
Pilot-free coherent systems use blind carrier phase estimation (CPE) methods that inevitably generate cycle slips. We propose an enhanced CPE reducing the cycle slip probability low enough to enable turbo differential decoding.
We study the impact of stressors such as phase slips on the performance of LDPC codes with differentially encoded coherent DP-QPSK, comparing classical soft-decision decoding and iterative (turbo) differential decoding. We find that turbo decoding shows improved baseline performance but suffers from severely reduced phase slip resilience.
We investigate phase slip aware soft decision metrics for coherently demodulated differentially encoded QPSK. A low-complexity approximation of a suitable metric has negligible penalty with practical soft decoders and is robust against residual phase noise.
We compare the performance of MLSE-based receivers with parametric and non- parametric channel estimation methods and characterize their sensitivity against quantization, sampling jitter, and intersymbol interference (ISI) overload.
MLSE offers adaptive non-linear receiver-sided equalization for channels with memory. New areas of application considered are directly modulated DFB laser, D(B/Q)PSK, and duo-binary transmission systems. Reduced computational complexity is a new research area.
We review the basic electronic equalization techniques. We report new results of MLSE equalizers for combined chromatic dispersion and PMD. We show first results on the dynamic channel tracking performance of MLSE equalizers for PMD.
Improvements in silicon processing speeds have resulted in integrated circuits that can sample and digitally process 10 Gbit/s data. Signal processing techniques that have radically altered radio communication can now be applied to optical communications to improve tolerance to impairments such as chromatic dispersion and polarisation mode dispersion, as well as transmitter/receiver imperfections...
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