611 citations · 1.5k across the 35 of their papers we have counts for
35 papers
Real-Time Monitoring of Cable Break in a Live Fiber Network using a Coherent Transceiver Prototype
Mikael Mazur, Lauren Dallachiesa, Roland Ryf +10
We monitor a 524km live network link using an FPGA-based sensing-capable coherent transceiver prototype during a human-caused cable break. Post-analysis of polarization data reveal…
Polarization Tracking in the Presence of PDL and Fast Temporal Drift
Mohammad Farsi, Christian Häger, Magnus Karlsson +1
In this paper, we analyze the effectiveness of polarization tracking algorithms in optical transmission systems suffering from fast state of polarization (SOP) rotations and polari…
Capacity Bounds under Imperfect Polarization Tracking
Mohammad Farsi, Magnus Karlsson, Erik Agrell
In optical fiber communication, due to the random variation of the environment, the state of polarization (SOP) fluctuates randomly with time leading to distortion and performance…
Overcoming the quantum limit of optical amplification in monolithic waveguides
Zhichao Ye, Ping Zhao, Krishna Twayana +3
Optical amplifiers are essential in numerous photonic applications. Parametric amplifiers, relying on a nonlinear material to create amplification, are uniquely promising as they c…
Over-the-fiber Digital Predistortion Using Reinforcement Learning
Jinxiang Song, Zonglong He, Christian Häger +4
We demonstrate, for the first time, experimental over-the-fiber training of transmitter neural networks (NNs) using reinforcement learning. Optical back-to-back training of a novel…
Low-complexity Voronoi shaping for the Gaussian channel
S. Li, A. Mirani, M. Karlsson +1
Voronoi constellations (VCs) are finite sets of vectors of a coding lattice enclosed by the translated Voronoi region of a shaping lattice, which is a sublattice of the coding latt…
Compressed Shaping: Concept and FPGA Demonstration
Tsuyoshi Yoshida, Koji Igarashi, Magnus Karlsson +1
Probabilistic shaping (PS) has been widely studied and applied to optical fiber communications. The encoder of PS expends the number of bit slots and controls the probability distr…
Analytical Modeling of Nonlinear Fiber Propagation for Four Dimensional Symmetric Constellations
Hami Rabbani, Mostafa Ayaz, Lotfollah Beygi +4
Coherent optical transmission systems naturally lead to a four dimensional (4D) signal space, i.e., two polarizations each with two quadratures. In this paper we derive an analytic…
Low-Complexity Geometric Shaping
Ali Mirani, Erik Agrell, Magnus Karlsson
Approaching Shannon's capacity via geometric shaping has usually been regarded as challenging due to modulation and demodulation complexity, requiring look-up tables to store the c…
Dissipative Kerr solitons in photonic molecules
Óskar B. Helgason, Francisco R. Arteaga-Sierra, Zhichao Ye +5
Many physical systems display quantized energy states. In optics, interacting resonant cavities show a transmission spectrum with split eigenfrequencies, similar to the split energ…
Pilot Distributions for Joint-Channel Carrier-Phase Estimation in Multichannel Optical Communications
Arni F. Alfredsson, Erik Agrell, Magnus Karlsson +1
Joint-channel carrier-phase estimation can improve the performance of multichannel optical communication systems. In the case of pilot-aided estimation, the pilots are distributed…
Optimization of Transmitter-Side Signal Rotations in the Presence of Laser Phase Noise
Arni F. Alfredsson, Erik Agrell, Magnus Karlsson +1
The effects of transmitter-side multidimensional signal rotations on the performance of multichannel optical transmission are studied in the presence of laser phase noise. In parti…
On the Performance under Hard and Soft Bitwise Mismatched-Decoding
Tsuyoshi Yoshida, Mikael Mazur, Jochen Schröder +2
We investigated a suitable auxiliary channel setting and the gap between Q-factors with hard and soft demapping. The system margin definition should be reconsidered for systems emp…
Improved Simulation Accuracy of the Split-Step Fourier Method
Shen Li, Magnus Karlsson, Erik Agrell
We investigate a modified split-step Fourier method (SSFM) by including low-pass filters in the linear steps. This method can simultaneously achieve a higher simulation accuracy an…
Joint Superchannel Digital Signal Processing for Ultimate Bandwidth Utilization
Mikael Mazur, Jochen Schröder, Magnus Karlsson +1
Modern optical communication systems transmit multiple frequency channels, each operating very close to its theoretical limit. The total bandwidth can reach 10THz limited by the op…
Performance Monitoring for Live Systems with Soft FEC and Multilevel Modulation
Tsuyoshi Yoshida, Mikael Mazur, Jochen Schröder +2
Performance monitoring is an essential function for margin measurements in live systems. Historically, system budgets have been described by the Q-factor converted from the bit err…
Post-FEC BER Benchmarking for Bit-Interleaved Coded Modulation with Probabilistic Shaping
Tsuyoshi Yoshida, Alex Alvarado, Magnus Karlsson +1
Accurate performance benchmarking after forward error correction (FEC) decoding is essential for system design in optical fiber communications. Generalized mutual information (GMI)…
An Improved Model of Nonlinear Fiber Propagation in the Presence of Kerr Nonlinearity and Stimulated Raman Scattering
Hami Rabbani, Gabriele Liga, Vinicius Oliari +4
Ultra-wideband fiber optical transmission suffers from both Kerr nonlinearity and stimulated Raman scattering (SRS). Mathematical models that address the interplay between Kerr non…
Preferred Design of Hierarchical Distribution Matching
Tsuyoshi Yoshida, Magnus Karlsson, Erik Agrell
Distribution matching and dematching (DM/invDM) are key functions in probabilistic shaping (PS). Recently techniques for low complexity implementation of DM/invDM have been well st…
Phase-coherent lightwave communications with frequency combs
Lars Lundberg, Mikael Mazur, Ali Mirani +5
Fiber-optical networks are a crucial telecommunication infrastructure in society. Wavelength division multiplexing allows for transmitting parallel data streams over the fiber band…
Enabling high spectral efficiency coherent superchannel transmission with soliton microcombs
Mikael Mazur, Myoung-Gyun Suh, Attila Fülöp +5
Optical communication systems have come through five orders of magnitude improvement in data rate over the last three decades. The increased demand in data traffic and the limited…
Pilot-Aided Joint-Channel Carrier-Phase Estimation in Space-Division Multiplexed Multicore Fiber Transmission
Arni F. Alfredsson, Erik Agrell, Henk Wymeersch +4
The performance of pilot-aided joint-channel carrier-phase estimation (CPE) in space-division multiplexed multicore fiber (MCF) transmission with correlated phase noise is studied.…
Hierarchical Distribution Matching for Probabilistically Shaped Coded Modulation
Tsuyoshi Yoshida, Magnus Karlsson, Erik Agrell
The implementation difficulties of combining distribution matching (DM) and dematching (invDM) for probabilistic shaping (PS) with soft-decision forward error correction (FEC) codi…
Performance Metrics for Systems with Soft-Decision FEC and Probabilistic Shaping
Tsuyoshi Yoshida, Magnus Karlsson, Erik Agrell
High-throughput optical communication systems utilize binary soft-decision forward error correction (SD-FEC) with bit interleaving over the bit channels. The generalized mutual inf…