Mitigating effect on turbulent scintillation using non-coherent multi-beam overlapped illumination

Lu, Zhou; Yuzhen, Tian; Wang, Rui; Wang, Tingfeng; Sun, Tieheng; Wang, Canjin; Yang, Xiaotian

doi:10.1016/j.optlastec.2017.06.013

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…This is a method that has been preferred by several astronomical projects 24 – 27 The OPD is engraved on the optical surface by different methods, such as index matching by Lexitek, 23 , 28 acrylic paint spraying, 24 , 29 or the cumulative etching by SILIOS Technologies 30 used by several AO systems coordinated by the European Southern Observatory (ESO). This approach ensures an accurate control of the phase distortion but losing versatility, as the distortions are not reconfigurable except by changing the phase screens.…”

Section: Optical Turbulence Emulationmentioning

confidence: 99%

Emulating and characterizing strong turbulence conditions for space-to-ground optical links: the PICOLO bench

Robles,

Petit,

Velluet

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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.We present a method to develop a turbulence emulation bench for low-Earth-orbit satellite-to-ground optical communication links under strong turbulence. We provide guidelines to characterize the spatio–temporal dynamics of phase disturbances and scintillation produced by the emulator on a laser beam. We implemented such an emulator for a link at 10 deg elevation and discuss here its design method and characterization. The characterization results are compared to numerical simulations, and this characterization results in the validation of a digital twin of the emulator. The emulator will serve as a testing platform for adaptive optics systems and other free-space optical communication components under strong turbulence conditions.

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Section: Optical Turbulence Emulationmentioning

confidence: 99%

Emulating and characterizing strong turbulence conditions for space-to-ground optical links: the PICOLO bench

Robles,

Petit,

Velluet

et al. 2023

J. Astron. Telesc. Instrum. Syst.

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Design of autofocusing beams based on accelerating beams

2021

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Autofocusing Airy-like beams have been designed based on the self-accelerating beams along arbitrary polynomial paths. The evolutions of the autofocusing beam in free space and turbulent atmosphere have been studied. Results show that the energy concentration of the autofocusing beam near the focal plane has a close relationship with its accelerating trajectory. The spot size of the autofocusing beam in the focal plane varies with the acceleration trajectory. The influence of turbulence on different autofocusing beams is different and has a relation with the degree of the curvature of the accelerating beam. The autofocusing beam propagating along a small curvature path has better resistance against turbulence.

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Multicore fiber beacon system for reducing back-reflection in satellite quantum key distribution

Simmons¹,

Donaldson²

2023

Opt. Express

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Optical beaconing is an important part of the acquisition, pointing and tracking system necessary for free-space quantum key distribution (QKD). However, uplink beacon back-reflections from the receiver architecture can result in noise. Wavelength- and time-division multiplexing has been used, but neither is yet sufficient to make back-reflection negligible. The use of additional telescopes increases complexity and pointing error. Here, we propose the use of a 2-by-2 multicore fiber, to act as an optical uplink beacon source. This spatially separates the QKD channel and optical uplink beacon. Up to 50 dB improvement in noise rejection over a purely spectrally divided system was demonstrated. The route to further improvements through greater fiber core separation is described. Beacon systems designed in this way could provide a combination of reduced complexity and improved noise performance to free-space and satellite QKD and optical communications.

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Mitigating effect on turbulent scintillation using non-coherent multi-beam overlapped illumination

Cited by 3 publications

References 15 publications

Emulating and characterizing strong turbulence conditions for space-to-ground optical links: the PICOLO bench

Emulating and characterizing strong turbulence conditions for space-to-ground optical links: the PICOLO bench

Design of autofocusing beams based on accelerating beams

Multicore fiber beacon system for reducing back-reflection in satellite quantum key distribution

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