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Your search keyword '"Lorences-Riesgo, A."' showing total 236 results
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236 results on '"Lorences-Riesgo, A."'

11. High-Capacity and Rain-Resilient Free-Space Optics Link Enabled by Time-Adaptive Probabilistic Shaping

Author

Guiomar, F. P., Lorences-Riesgo, A., Ranzal, D., Rocco, F., Sousa, A. N., Carena, A., Teixeira, A. L., Medeiros, M. C. R., and Monteiro, P. P.

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

Using time-adaptive probabilistic shaped 64QAM driven by a simple SNR prediction algorithm, we demonstrate $>$450 Gbps transmission over a 55-m free-space optics link with enhanced resilience towards rainy weather conditions. Through continuous measurement over 3-hours, we demonstrate $\sim$40~Gbps average bit-rate gain over unsupervised fixed modulation.

Published
2019

12. High-order coherent communications using mode-locked dark-pulse Kerr combs from microresonators

Author

Fülöp, Attila, Mazur, Mikael, Lorences-Riesgo, Abel, Wang, Pei-Hsun, Xuan, Yi, Leaird, Dan. E., Qi, Minghao, Andrekson, Peter A., Weiner, Andrew M., and Torres-Company, Victor

Subjects
Physics - Optics
Abstract

Microresonator frequency combs harness the nonlinear Kerr effect in an integrated optical cavity to generate a multitude of phase-locked frequency lines. The line spacing can reach values in the order of 100 GHz, making it an attractive multi-wavelength light source for applications in fiber-optic communications. Depending on the dispersion of the microresonator, different physical dynamics have been observed. A recently discovered comb state corresponds to the formation of mode-locked dark pulses in a normal-dispersion microcavity. Such dark-pulse combs are particularly compelling for advanced coherent communications since they display unusually high power conversion efficiency. Here, we report the first coherent transmission experiments using 64-quadrature amplitude modulation encoded onto the frequency lines of a dark-pulse comb. The high conversion efficiency of the comb enables transmitted optical signal-to-noise ratios above 33 dB while maintaining a laser pump power level compatible with state-of-the-art hybrid silicon lasers.

Published
2018
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19. Long-haul coherent communications using microresonator-based frequency combs

Author

Fülöp, Attila, Mazur, Mikael, Lorences-Riesgo, Abel, Eriksson, Tobias A., Wang, Pei-Hsun, Xuan, Yi, Leaird, Dan E., Qi, Minghao, Andrekson, Peter A., Weiner, Andrew M., and Torres-Company, Victor

Subjects
Physics - Optics
Abstract

Microresonator-based frequency combs are strong contenders as light sources for wavelength-division multiplexing (WDM). Recent demonstrations have shown the potential of microresonator combs for replacing tens of WDM lasers with a single laser-pumped device. These experiments relied on microresonators displaying anomalous dispersion. Devices operating in the normal dispersion offer the prospect of attaining high power conversion efficiency - an aspect that will be crucial in the future for enabling energy-efficient coherent communications with higher order modulation formats or lighting several spatial channels in space-division multiplexing. Here we report the experimental demonstration of coherent communications using normal dispersion microresonator combs. With polarization multiplexed (PM) quadrature phase-shift keying, we transmitted data over more than 6300 km in single-mode fiber. In a second experiment, we reached beyond 700 km with PM 16 quadrature amplitude modulation format and an aggregate data rate above 900 Gbit/s assuming 6% error correction overhead. These results represent the longest fiber transmission ever achieved using an integrated comb source., Comment: 7 pages, 6 figures

Published
2017
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43. High-order coherent communications using mode-locked dark-pulse Kerr combs from microresonators

Author

Attila Fülöp, Mikael Mazur, Abel Lorences-Riesgo, Óskar B. Helgason, Pei-Hsun Wang, Yi Xuan, Dan E. Leaird, Minghao Qi, Peter A. Andrekson, Andrew M. Weiner, and Victor Torres-Company

Subjects
Science
Abstract

Dark-pulse combs may be useful for coherent communications since they display high power conversion efficiency. Here, the authors report the first demonstration of coherent wavelength division multiplexing using dark pulse microresonator combs high signal-to-noise while maintaining a low on-chip pump power.

Published
2018
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44. Carrier-Phase Recovery for Coherent Optical Systems: Algorithms, Challenges and Solutions

Author

Neves, Manuel S., Lorences-Riesgo, Abel, Martins, Celestino S., Mumtaz, Sami, Charlet, Gabriel, Monteiro, Paulo P., and Guiomar, Fernando P.

Abstract

Carrierphase recovery (CPR) is a key digital signal processing (DSP) subsystem in optical fiber communications. In this paper, we review recent advances in CPR algorithms and analyze their performance under the impact of different system impairments in a long-haul 256 GBaud setting. We study both single- and dual-stage CPR configurations, in the linear and nonlinear regimes, and at different system baud rates. By exploiting CPR algorithms tailored for digital subcarrier multiplexing (DSCM) systems, we are able to reap the benefits of their intrinsic resilience to the two main performance-limiting effects of optical fiber systems: equalization enhanced phase noise (EEPN) and nonlinear interference (NLI). Overall, the paper sheds light on the potential benefits of DSCM and highlights the need for further research into CPR algorithms that specifically target the effect of nonlinear phase noise (NLPN).

Published
2024
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