Effect of the Atmospheric Turbulence on the Performance of Free Space Quantum Communication

Min, 聂敏 Nie; Kun, 高 锟 Gao; Guang, 杨光 Yang; Meiling, 张美玲 Zhang; Changxing, 裴昌幸 Pei

doi:10.3788/gzxb20164507.070701001

Cited by 5 publications

(2 citation statements)

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“…In laser communication, the phenomenon of turbulence in the atmosphere has serious interference with the laser beam, which in turn affects the signal-to-noise ratio and bit error rate in laser communication [1]. This is due to the fact that atmospheric turbulence causes variations in the intensity and phase of the laser light, and these variations seriously affect the imaging quality of the beacon spot and the communication spot, leading to a reduction in pointing accuracy and communication quality [2].…”

Section: Introductionmentioning

confidence: 99%

Improved DeepLabV3+ Network Beacon Spot Capture Methods

Liu,

Ni,

et al. 2024

Photonics

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In long-range laser communication, adaptive optics tracking systems are often used to achieve high-precision tracking. When recognizing beacon spots for tracking, the traditional threshold segmentation method is highly susceptible to segmentation errors in the face of interference. In this study, an improved DeepLabV3+ network is designed for fast and accurate capture of beacon spots in complex situations. In order to speed up the inference process, the backbone of the model was rewritten as MobileNetV2. This study improves the ASPP (Atrous Spatial Pyramid Pooling) module by splicing and fusing the outputs and inputs of its different layers. Meanwhile, the original convolution in the module is rewritten as a depthwise separable convolution with a dilation rate to reduce the computational burden. CBAM (Convolutional Block Attention Module) is applied, and the focus loss function is introduced during training. The network yields an accuracy of 98.76% mean intersection over union on self-constructed beacon spot dataset, and the segmentation consumes only 12 milliseconds, which realizes the fast and high-precision capturing of beacon spots.

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Section: Introductionmentioning

confidence: 99%

Improved DeepLabV3+ Network Beacon Spot Capture Methods

Liu,

Ni,

et al. 2024

Photonics

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“…Atmospheric optical turbulence is a leading cause of signal degradation in free-space optical communications (FSOC) and quantum key distribution (QKD). 1,2 Variations in the atmosphere's refractive-index cause perturbations in the propagating beam's intensity and phase. Both of these lead to signal loss and can lead to further losses when coupling the light into a single mode fibre at the receiver.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric optical turbulence analysis in London’s financial district

Westerby-Griffin

Osborn

Farley

et al. 2023

Free-Space Laser Communications XXXV

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Atmospheric optical turbulence causes signal loses in laser propagation. Here we present vertical measurements of optical turbulence taken in London's financial district. Additionally, we demonstrate a method of modelling atmospheric states in simulation from the measured data. From this we derive the predicted system performance of an optical downlink from a satellite in low Earth orbit (LEO) to ground in the atmospheric conditions observed on the night. We also present the improvements in performance with the addition of adaptive optics at the receiver end.

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Turbulent Effects on Continuous-Variable Quantum Key Distribution

Wen

Liu

2022

2022 International Conference on Information Technology, Communication Ecosystem and Management (ITCEM)

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Effect of the Atmospheric Turbulence on the Performance of Free Space Quantum Communication

Cited by 5 publications

References 0 publications

Improved DeepLabV3+ Network Beacon Spot Capture Methods

Improved DeepLabV3+ Network Beacon Spot Capture Methods

Atmospheric optical turbulence analysis in London’s financial district

Turbulent Effects on Continuous-Variable Quantum Key Distribution

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