15 papers
Low-complexity Soft-decision LLR Calculations for Next-generation IM-DD Systems with RIN
Felipe Villenas, Yunus Can Gültekin, Alex Alvarado
The demand for higher speeds in intra-data center interconnects will eventually require high-order pulse amplitude modulation (PAM) combined with soft-decision (SD) forward error c…
Characterizing Nonlinearities in IM-DD Links via the Best Linear Approximation: Distortion Analysis and Modulation Optimization
Sebastian Fraga Fernández, Leonardo Minelli, Fernando de Bernardinis +3
We use the best linear approximation (BLA) to characterize nonlinearities in IM-DD links. The orthogonal nonlinear distortion is shown to be non-Gaussian. The BLA is used to approx…
On LLR Calculations for Soft-decision Decoding in Next-generation IM-DD Systems with Laser RIN
Felipe Villenas, Yunus Can Gültekin, Alex Alvarado
We propose a low-complexity LLR approximation for SD decoding in IM-DD systems with relative intensity noise. Our approximation results in no BER performance penalty for a concaten…
Regular Perturbation on the Group-Velocity Dispersion Parameter for Dual-Polarization Short-Reach Systems
Dario Cellini, Vinícius Oliari, Erik Agrell +3
The Manakov equation governs the propagation of signals in dual-polarization systems. Its solution is usually approximated by regular perturbation on the nonlinear Kerr parameter.…
High-throughput Low-latency Hardware Implementation of BCH Decoders
Jasper Lagendijk, Wenqing Song, Yunus Can Gültekin +3
Two well-known decoding algorithms for BCH codes are conventional decoding, based on the Berlekamp-Massey algorithm in combination with Chien search, and direct decoding, which use…
Optical Communications with Relative Intensity Noise: Channel Modeling and Information Rates
Felipe Villenas, Yunus Can Gültekin, Alex Alvarado
We consider optical communications with intensity modulation and direct detection affected by laser relative intensity noise (RIN). Starting from a continuous-time waveform model,…