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Introducing 4D Geometric Shell Shaping for Mitigating Nonlinear Interference Noise
Reach increase and nonlinearity tolerance are evaluated in terms of achievable information rates and post-FEC bit-error rate.
4D Geometric Shell Shaping with Applications to 400ZR
Geometric shell shaping is introduced and evaluated for reach increase and nonlinearity tolerance in terms of MI against PM-16QAM and PS-PM-16QAM in a 400ZR compatible transmission setup.
Experimental Validation of Sequence-Wise Predistorter for Evaluation of Geometrically Shaped 128-QAM
A predistorter for transmitter nonlinearities is applied to the evaluation of a geometrically shaped constellation, such that constellation points are transmitted correctly during the evaluation of the geometrically shaped constellation.
Mitigating Nonlinear Interference by Limiting Energy Variations in Sphere Shaping
Band-trellis enumerative sphere shaping is proposed to decrease the energy variations in channel input sequences.
MDG and SNR Estimation in SDM Transmission Based on Artificial Neural Networks
In a recent work we propose an MDG and SNR estimation method using ANN.
High-Cardinality Hybrid Shaping for 4D Modulation Formats in Optical Communications Optimized via End-to-End Learning
In this paper we carry out a joint optimization of probabilistic (PS) and geometric shaping (GS) for four-dimensional (4D) modulation formats in long-haul coherent wavelength division multiplexed (WDM) optical fiber communications using an auto-encoder framework.
Low-Complexity Geometrical Shaping for 4D Modulation Formats via Amplitude Coding
Signal shaping is vital to approach Shannon's capacity, yet it is challenging to implement at very high speeds.
Real-time Transmission of Geometrically-shaped Signals using a Software-defined GPU-based Optical Receiver
A software-defined optical receiver is implemented on an off-the-shelf commercial graphics processing unit (GPU).
Real-time 10,000 km Straight-line Transmission using a Software-defined GPU-Based Receiver
8-, 16-, 32-, and 64-QAM are successfully transmitted over 7600, 5600, 3600, and 1600 km, respectively.
Kramers-Kronig Receiver Combined With Digital Resolution Enhancer
A Kramers-Kronig receiver with a continuous wave tone added digitally at the transmitter is combined with a digital resolution enhancer to limit the increase in transmitter quantization noise.
Kurtosis-limited Sphere Shaping for Nonlinear Interference Noise Reduction in Optical Channels
Nonlinear interference (NLI) generated during the propagation of an optical waveform through the fiber depends on the fourth order standardized moment of the channel input distribution, also known as kurtosis.
Neural-network-based MDG and Optical SNR Estimation in SDM Transmission
We propose a neural network model for MDG and optical SNR estimation in SDM transmission.
10,000 km Straight-line Transmission using a Real-time Software-defined GPU-Based Receiver
Real-time operation of a software-defined, GPU-based optical receiver is demonstrated over a 100-span straight-line optical link.
Field Trial of a Flexible Real-time Software-defined GPU-based Optical Receiver
We introduce a flexible, software-defined real-time multi-modulation format receiver implemented on an off-the-shelf general-purpose graphics processing unit (GPU).
1 Tbit/s/$λ$ Transmission Over a 130 km Link Consisting of Graded-Index 50 $μ$m Core Multi-Mode Fiber and 6LP Few-Mode Fiber
We demonstrate 1 Tbit/s/$\lambda$ single-span transmission over a heterogeneous link consisting of graded-index 50 $\mu$m core multi-mode fiber and 6LP few-mode fiber using a Kramers-Kronig receiver structure.
Signal Processing
Experimental validation of MDL emulation and estimation techniques for SDM transmission systems
We experimentally validate a mode-dependent loss (MDL) estimation technique employing acorrection factor to remove the MDL estimation dependence on the SNR when using a minimum meansquare error (MMSE) equalizer.
Real-time, Software-Defined, GPU-Based Receiver Field Trial
We demonstrate stable real-time operation of a software-defined, GPU-based receiver over a metropolitan network.
Exploiting Angular Multiplexing for Polarization-diversity in Off-axis Digital Holography
Digital holography measures the complex optical field and transfer matrix of a device, polarization-diversity is often achieved through spatial multiplexing.
Mode-dependent Loss and Gain Estimation in SDM Transmission Based on MMSE Equalizers
Based on the transfer function of MIMO MMSE equalizers, and assuming a known SNR, we calculate a correction factor that improves the estimation process in moderate levels of MDL/MDG and SNR.
Revisiting Efficient Multi-Step Nonlinearity Compensation with Machine Learning: An Experimental Demonstration
One guiding principle for previous work on the design of practical nonlinearity compensation schemes is that fewer steps lead to better systems.
Analysis and Experimental Demonstration of Orthant-Symmetric Four-dimensional 7 bit/4D-sym Modulation for Optical Fiber Communication
We propose a new four-dimensional orthant-symmetric 128-ary modulation format (4D-OS128) with a spectral efficiency of 7bit/4D-sym.
