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Your search keyword '"Lorences-Riesgo, A."' showing total 241 results
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241 results on '"Lorences-Riesgo, A."'

10. 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

11. 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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14. 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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18. 5G-Compatible IF-Over-Fiber Transmission Using a Low-Cost SFP-Class Transceiver

Author

Marco A. Fernandes, Bruno T. Brandao, Abel Lorences-Riesgo, Paulo P. Monteiro, and Fernando P. Guiomar

Subjects
5G, memory polynomial, analog radio-over-fiber, Electrical engineering. Electronics. Nuclear engineering, TK1-9971
Abstract

With the rise of 5G and beyond, the ever-increasing data-rates demanded by mobile access are severely challenging the capacity of optical fronthaul networks. Despite its high reliability and ease of deployment, legacy digital radio-over-fiber (RoF) technologies face an upcoming bandwidth bottleneck in the short term. This has motivated a renewed interest in the development of analog RoF alternatives, owing to their high spectral efficiency. However, unlike its digital counterpart, analog RoF transmission requires a highly linear transceiver to guarantee signal fidelity. Typical solutions exploited in recent research works tend to adopt the use of bulky benchtop components, such as directly modulated lasers (DML) and photodiodes. Although this provides a convenient and quick path for proof-of-concept demonstrations, there is still a considerable gap between lab developments and commercial deployment. Most importantly, a key question arises: can analog-RoF transceivers meet the 5G requirements while being competitive in terms of cost and footprint? Following this challenge, in this work we exploit the use of a low-cost commercial off-the-shelf (COTS) small form-factor pluggable (SFP) transceiver, originally designed for digital transmission at 1 Gbps, which is properly adapted towards analog RoF transmission. Bypassing the digital electronics circuitry of the SFP, while keeping the original transmitter optical sub-assembly (TOSA) and receiver optical sub-assembly (ROSA), we demonstrate that high-performance 5G-compatible transmission can be performed by reusing the key built-in components of current low-cost SFP-class transceivers. Particularly, we demonstrate error vector magnitude (EVM) performances compatible with 5G 64QAM transmission both at 100MHz and 400MHz. Furthermore, employing a memory polynomial model for digital pre-distortion of the transmitted signal, we achieve 256QAM-compatible performance at 100MHz bandwidth, after 20 km fronthaul transmission.

Published
2022
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38. Time-Frequency Range Estimation Method for Pulsed LiDAR

Author

Daniel Bastos, Alexandre Brandao, Abel Lorences-Riesgo, Paulo P. Monteiro, Arnaldo S. R. Oliveira, Dionisio Pereira, Hadi Z. Olyaei, and Miguel V. Drummond

Subjects
Computer Networks and Communications, Automotive Engineering, Aerospace Engineering, Electrical and Electronic Engineering
Published
2023

42. 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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