The Experts below are selected from a list of 1776 Experts worldwide ranked by ideXlab platform
Belmonte Aniceto - One of the best experts on this subject based on the ideXlab platform.
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Intensity-based adaptive optics with sequential optimization for laser communications
'The Optical Society', 2018Co-Authors: Carrizo, Carlos Eduardo, Mata Calvo Ramon, Belmonte AnicetoAbstract:Wavefront distortions of Optical waves propagating through the turbulent atmosphere are responsible for phase and amplitude fluctuations, causing random fading in the Signal coupled into single-mode Optical fibers. Wavefront aberrations can be confronted, in principle, with adaptive optics technology that compensates the Incoming Optical Signal by the phase conjugation principle and mitigates the likeliness of fading. However, real-time adaptive optics requires phase wavefront measurements, which are generally difficult under typical propagation conditions for communication scenarios. As an alternative to the conventional adaptive optics approach, here, we discuss a novel phase-retrieval technique that indirectly determines the unknown phase wavefront from focal-plane intensity measurements. The adaptation approach is based on sequential optimization of the speckle pattern in the focal plane and works by iteratively updating the phases of individual speckles to maximize the received power. We found in our analysis that this technique can compensate the distorted phasefront and increase the Signal coupled with a significant reduction in the required number of iterations, resulting in a loop bandwidth utilization well within the capacity of commercially available deformable mirrors
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Intensity-based adaptive optics with sequential optimization for laser communications
'The Optical Society', 2018Co-Authors: Carrizo, Carlos E., Mata Calvo Ramon, Belmonte AnicetoAbstract:Wavefront distortions of Optical waves propagating through the turbulent atmosphere are responsible for phase and amplitude fluctuations, causing random fading in the Signal coupled into single-mode Optical fibers. Wavefront aberrations can be confronted, in principle, with adaptive optics technology that compensates the Incoming Optical Signal by the phase conjugation principle and mitigates the likeliness of fading. However, real-time adaptive optics requires phase wavefront measurements, which are generally difficult under typical propagation conditions for communication scenarios. As an alternative to the conventional adaptive optics approach, here, we discuss a novel phase-retrieval technique that indirectly determines the unknown phase wavefront from focal-plane intensity measurements. The adaptation approach is based on sequential optimization of the speckle pattern in the focal plane and works by iteratively updating the phases of individual speckles to maximize the received power. We found in our analysis that this technique can compensate the distorted phasefront and increase the Signal coupled with a significant reduction in the required number of iterations, resulting in a loop bandwidth utilization well within the capacity of commercially available deformable mirrors.Peer Reviewe
Mata Calvo Ramon - One of the best experts on this subject based on the ideXlab platform.
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Intensity-based adaptive optics with sequential optimization for laser communications
'The Optical Society', 2018Co-Authors: Carrizo, Carlos Eduardo, Mata Calvo Ramon, Belmonte AnicetoAbstract:Wavefront distortions of Optical waves propagating through the turbulent atmosphere are responsible for phase and amplitude fluctuations, causing random fading in the Signal coupled into single-mode Optical fibers. Wavefront aberrations can be confronted, in principle, with adaptive optics technology that compensates the Incoming Optical Signal by the phase conjugation principle and mitigates the likeliness of fading. However, real-time adaptive optics requires phase wavefront measurements, which are generally difficult under typical propagation conditions for communication scenarios. As an alternative to the conventional adaptive optics approach, here, we discuss a novel phase-retrieval technique that indirectly determines the unknown phase wavefront from focal-plane intensity measurements. The adaptation approach is based on sequential optimization of the speckle pattern in the focal plane and works by iteratively updating the phases of individual speckles to maximize the received power. We found in our analysis that this technique can compensate the distorted phasefront and increase the Signal coupled with a significant reduction in the required number of iterations, resulting in a loop bandwidth utilization well within the capacity of commercially available deformable mirrors
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Intensity-based adaptive optics with sequential optimization for laser communications
'The Optical Society', 2018Co-Authors: Carrizo, Carlos E., Mata Calvo Ramon, Belmonte AnicetoAbstract:Wavefront distortions of Optical waves propagating through the turbulent atmosphere are responsible for phase and amplitude fluctuations, causing random fading in the Signal coupled into single-mode Optical fibers. Wavefront aberrations can be confronted, in principle, with adaptive optics technology that compensates the Incoming Optical Signal by the phase conjugation principle and mitigates the likeliness of fading. However, real-time adaptive optics requires phase wavefront measurements, which are generally difficult under typical propagation conditions for communication scenarios. As an alternative to the conventional adaptive optics approach, here, we discuss a novel phase-retrieval technique that indirectly determines the unknown phase wavefront from focal-plane intensity measurements. The adaptation approach is based on sequential optimization of the speckle pattern in the focal plane and works by iteratively updating the phases of individual speckles to maximize the received power. We found in our analysis that this technique can compensate the distorted phasefront and increase the Signal coupled with a significant reduction in the required number of iterations, resulting in a loop bandwidth utilization well within the capacity of commercially available deformable mirrors.Peer Reviewe
Carrizo, Carlos E. - One of the best experts on this subject based on the ideXlab platform.
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Intensity-based adaptive optics with sequential optimization for laser communications
'The Optical Society', 2018Co-Authors: Carrizo, Carlos E., Mata Calvo Ramon, Belmonte AnicetoAbstract:Wavefront distortions of Optical waves propagating through the turbulent atmosphere are responsible for phase and amplitude fluctuations, causing random fading in the Signal coupled into single-mode Optical fibers. Wavefront aberrations can be confronted, in principle, with adaptive optics technology that compensates the Incoming Optical Signal by the phase conjugation principle and mitigates the likeliness of fading. However, real-time adaptive optics requires phase wavefront measurements, which are generally difficult under typical propagation conditions for communication scenarios. As an alternative to the conventional adaptive optics approach, here, we discuss a novel phase-retrieval technique that indirectly determines the unknown phase wavefront from focal-plane intensity measurements. The adaptation approach is based on sequential optimization of the speckle pattern in the focal plane and works by iteratively updating the phases of individual speckles to maximize the received power. We found in our analysis that this technique can compensate the distorted phasefront and increase the Signal coupled with a significant reduction in the required number of iterations, resulting in a loop bandwidth utilization well within the capacity of commercially available deformable mirrors.Peer Reviewe
Carrizo, Carlos Eduardo - One of the best experts on this subject based on the ideXlab platform.
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Intensity-based adaptive optics with sequential optimization for laser communications
'The Optical Society', 2018Co-Authors: Carrizo, Carlos Eduardo, Mata Calvo Ramon, Belmonte AnicetoAbstract:Wavefront distortions of Optical waves propagating through the turbulent atmosphere are responsible for phase and amplitude fluctuations, causing random fading in the Signal coupled into single-mode Optical fibers. Wavefront aberrations can be confronted, in principle, with adaptive optics technology that compensates the Incoming Optical Signal by the phase conjugation principle and mitigates the likeliness of fading. However, real-time adaptive optics requires phase wavefront measurements, which are generally difficult under typical propagation conditions for communication scenarios. As an alternative to the conventional adaptive optics approach, here, we discuss a novel phase-retrieval technique that indirectly determines the unknown phase wavefront from focal-plane intensity measurements. The adaptation approach is based on sequential optimization of the speckle pattern in the focal plane and works by iteratively updating the phases of individual speckles to maximize the received power. We found in our analysis that this technique can compensate the distorted phasefront and increase the Signal coupled with a significant reduction in the required number of iterations, resulting in a loop bandwidth utilization well within the capacity of commercially available deformable mirrors
Ping Koy Lam - One of the best experts on this subject based on the ideXlab platform.
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Quantum enhancement of Signal-to-noise ratio with a heralded linear amplifier
2017Co-Authors: Jie Zhao, Josephine Dias, Jing Yan Haw, Thomas Symul, Mark Bradshaw, Rémi Blandino, Timothy C. Ralph, Syed M. Assad, Ping Koy LamAbstract:Amplification of Signals is an elemental function for many information processing systems and communication networks. However, Optical quantum amplification has always been a technical challenge in both free space and fiber optics communication. Any phase-insensitive amplification of quantum light states would experience a degradation of Signal-to-noise ratio as large as 3 dB for large gains. Fortunately, this degradation can be surmounted by probabilistic amplification processes. Here we experimentally demonstrate a linear amplification scheme for coherent input states that combines a heralded measurement-based noiseless linear amplifier and a deterministic linear amplifier. The amplifier is phase-insensitive and can enhance the Signal-to-noise ratio of the Incoming Optical Signal. By concatenating the two amplifiers, it introduces flexibility that allows one to tune between the regimes of high gain or high noise reduction and control the trade-off between these performances and a finite heralding probability. We demonstrate amplification with a Signal transfer coefficient of T-s > 1 with no statistical distortion of the output state. By partially relaxing the demand of output Gaussianity, we can obtain further improvement to achieve a T-s = 2.55 +/- 0.08 with an amplification gain of 10.54. Since our amplification scheme only relies on linear optics and a post-selection algorithm, it has the potential of being used as a building block in extending the distance of quantum communication. (C) 2017 Optical Society of America
