Atmospheric effects on availability of free space optics systems
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In this paper, the availability of free space optics (FSO) systems in dependence on weather conditions and on FSO link parameters, such as transmitted optical power, beam divergence, receiver sensitivity or link path distance, is discussed.Abstract:
The availability of free space optics (FSO) systems in dependence on weather conditions and on FSO link parameters, such as transmitted optical power, beam divergence, receiver sensitivity or link path distance, is discussed. A number of phenomena in the atmosphere, such as absorption, scattering, and turbulence, can affect beam attenuation, but in the case of wavelengths typical of FSO systems operation, only scattering and turbulence are appropriate to be taken into consideration. We model the power loss caused by turbulence by using the Rytov scintillation theory. Attenuation due to scattering, which can be expressed as a function of the link distance, wavelength, and meteorological visibility, is calculated from visibility data collected at several airports in Europe. Statistical evaluation of the attenuation caused by scattering and the power link margin calculated from FSO link parameters are used for calculating the link availability.read more
Citations
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Journal ArticleDOI
Modeling of Fog and Smoke Attenuation in Free Space Optical Communications Link Under Controlled Laboratory Conditions
TL;DR: In this paper, the authors theoretically and experimentally investigate the spectrum attenuation of free space optical (FSO) communication systems operating at visible and near infrared (NIR) wavelengths.
Proceedings ArticleDOI
Physics-Based Rendering for Improving Robustness to Rain
TL;DR: A physically-based rain rendering pipeline for realistically inserting rain into clear weather images is presented, and refining existing networks with the authors' augmented images improves the robustness of both object detection and semantic segmentation algorithms.
Journal ArticleDOI
Ethernet FSO Communications Link Performance Study Under a Controlled Fog Environment
TL;DR: Results shown indicate that the 4-PPM signalling scheme is the most robust to the fog attenuation due to its high peak-to-average power ratio and shows the potential of the indoor atmospheric chamber to replicate outdoor atmospheric effects (such as fog) and be able to quickly characterise and assess the FSO system under a controlled environment.
Posted Content
Physics-Based Rendering for Improving Robustness to Rain
TL;DR: In this paper, a physically-based rain rendering pipeline is presented for inserting rain into clear weather images, which relies on a physical particle simulator, an estimation of the scene lighting and an accurate rain photometric modeling to augment images with arbitrary amount of realistic rain or fog.
Journal ArticleDOI
Performance analysis on 16-channels wavelength division multiplexing in free space optical transmission under tropical regions environment
Salasiah Hitam,Siti Norziela Suhaimi,Ahmad Shukri Muhammad Noor,Siti Barirah Ahmad Anas,Ratna Kalos Zakiah Sahbudin +4 more
TL;DR: Simulation results showed that WDM FSO system may be a good candidate to solve the last mile problem and also it has capability to accommodate the channels more than 16 and by introducing the error correction code or balance detection, the transmission distance might be increased further.
References
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Book
Absorption and Scattering of Light by Small Particles
TL;DR: In this paper, a Potpourri of Particles is used to describe surface modes in small Particles and the Angular Dependence of Scattering is shown to be a function of the size of the particles.
Book
Laser Beam Scintillation with Applications
TL;DR: Optical wave propagation in random media is discussed in this paper, where the authors present a background review of the background of optical wave propagation and its application in the field of laser communication systems.