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Various measurement campaigns have been carried out at different locations by several institutes to study the weather effects, mainly fog, on Free-space optical (FSO) links. Link distance between the FSO transceiver is different for most of the measurement campaigns depending upon the installation and the weather conditions. Specific attenuation with the unit of dB/km is widely used for the detailed...
Wireless optical links are being increasingly deployed in a variety of indoor and outdoor applications. While it is known that fog and clouds produce the highest attenuation values on optical waves travelling through the Earth's atmosphere, it is shown here that other particulates as rain and snow might have a non-negligible effect, depending on the local climatology and on the quality of service...
Free space optics (FSO) is getting increased popularity during last few years due to its increased power efficiency for reasonably longer distances. Moreover, it provides data rates that can cater for our future broadband telecommunication requirements besides resolving the last mile access bottleneck. But FSO links are subjected to various kinds of signal deteriorations and attenuations due to different...
Line of sight optical wireless or free space optics (FSO) plays an increasingly important role in our communication infrastructure as they offer gigabit per second data rates and low system complexity. The biggest disadvantage of terrestrial FSO links is that low clouds, dry snow and especially dense fog conditions entail heavy losses to the optical beam transmitted in the terrestrial free-space....
Optical wireless links offer gigabit per second data rates and low system complexity. For ground-space and or terrestrial communication scenarios, these links suffer from atmospheric loss mainly due to fog, scintillation and precipitation. We investigate here the impact of fog, rain and snow effects and evaluate their performance on the basis of attenuation data collected for the optical pulse propagated...
High-bandwidth optical wireless transmission links are of prime importance and have tremendous potential to serve for the next generation optical access networks. Currently optical wireless or Free Space Optics (FSO) communication products supporting data rates over 1 Gbps are available from several communication equipment manufacturers. One obvious accompanying disadvantage of this technology comes...
The performance behavior of optical wireless links installed at Graz and Nice is discussed and analyzed for moderate continental fog and dense maritime fog conditions. The knowledge of the free space optical (FSO) wireless links behaviour and the corresponding measured attenuations analysis for the two most prevalent fog types is mandatory as fog severely affects the availability and reliability of...
Fog presents the biggest challenge to propagation of optical signal in free space causing severe attenuations reaching up to several hundred of dB/km. In this paper, an overall fog attenuation behavior of the optical wireless links installed at Milan (Italy) and Graz (Austria) under moderate continental fog conditions, and Nice (France) under dense maritime fog environments is compared and evaluated...
Interest in free space optics (FSO) has gained enormous popularity over the last few years, mainly due to two reasons, firstly delivering data rates that can meet future broadband telecommunication requirements and secondly as an alternate technology to solve the last mile access gap. However, optical signal transmitted in free space is subjected to deterioration while propagating due to its interactions...
Free space optics (FSO) links in the troposphere are highly dependent on different atmospheric effects, which vary according to different climatic conditions. For terrestrial FSO links, fog is the most critical of all atmospheric effects causing optical signal attenuations up to 480 dB/km in dense maritime fog environments and 130 dB/km in moderate continental fog environments. In this paper a brief...
The effect of snow on a FSO link is here addressed both theoretically and experimentally. Data collected during the snowfalls occurred in Milan, Italy, in the winter time of 2005 and 2006 are presented and discussed. It is shown that attenuation due to snow is not at all negligible because it could largely exceed the one caused by heavy rainstorms. Further, as in the case of rain events, the use of...
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