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- W2896536044 abstract "Free-space optical communications (FSOC) are rapidly becoming a key technology for terrestrial, aerial, and space communication, mainly because of its very high throughput capacity. To achieve multi-gigabit laser downstream, an efficient single-mode fiber coupling is required. However, atmospheric turbulence remains one of FSOC’s main limitations. The turbulence affects the communications performance by inducing wavefront distortions that develop into coupled power fluctuations. In regimes of very strong turbulence, the use of traditional adaptive optics systems is limited due to strong scintillation and higher number of phase singularities. These limitations could be solved by relying on systems based on the stochastic iterative maximization of the coupled power. The drawback of such systems is that a high number of iterations are required for signal optimization. We address this problem and propose a different iterative method that compensates the distorted pupil phasefront by operating directly on the focal plane. The technique works by iteratively updating the phases of individual speckles to maximize the received power coupled into a single-mode fiber. We show numerically and experimentally that the method can improve the quality of the received signal with reduced bandwidth utilization." @default.
- W2896536044 created "2018-10-26" @default.
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- W2896536044 date "2018-10-09" @default.
- W2896536044 modified "2023-09-24" @default.
- W2896536044 title "Speckle-based sequential optimization of adaptive receivers in downlink laser communications" @default.
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- W2896536044 doi "https://doi.org/10.1117/12.2325675" @default.
- W2896536044 hasPublicationYear "2018" @default.
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