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Atmospheric FSO channel emulator: (a) hardware interface and VOA; (b) measurements providing set attenuation vs. measured attenuation curve of the used VOA.
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Free Space Optics (FSO) technology enabling next-generation near-Earth communication is prone to severe propagation losses due to atmospheric-turbulence-induced fading and Mie scattering (clouds). As an alternative to the real-time evaluation of the weather effects over optical signal, a state-of-the-art laboratory testbed for verification of slant...
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In this paper, we propose and enhance the performance of a wavelength-division multiplexed hybrid fibre/free-space optics passive optical network (PON) system. The proposed system makes use of digital-pulse-position modulation scheme. The system performance is investigated under the turbulence effects and inter-channel crosstalk using numerical sim...
Citations
... Many studies have been performed to simulate missions that include these processes. Most models focused specifically on atmospheric turbulence, attenuation, and platform vibrations [5,[8][9][10] and some also included bit transportation processes [11][12][13]. Another focus was on network latency, where the routing of inter-satellite-links (ISLs) was modeled [14]. ...
To support the development of free-space-optical (FSO) communication technologies, an end-to-end physical layer model of a satellite communication service was developed. This service involves physical processes spanning multiple time scales: hours (relative platform dynamics), minutes (link selection, atmospheric attenuation), milliseconds (atmospheric turbulence, platform disturbances), and nanoseconds (photon and bit transportation). The modified multi-scale method (MMM) was used to combine the physics of these processes and to model an end-to-end global FSO communication service between an airborne platform and a satellite constellation. The method provides a better understanding of physical interdependencies, allows performance analysis on multiple time scales, and enables valuable insight into where to optimize such a service. The results show realistic performance metrics when compared to other smaller-scale models and demonstrations. The MMM can be used as a mission performance indicator of an end-to-end satellite communication service.
... 3) FSO: A hardware testbed emulator for satellite-toground FSO downlinks that allows real-time evaluation of the weather effects and performance tests of various PDs was developed in [153]. For this testbed, the atmospheric scintillation data were obtained from the Radiosonde Observation databases combined with a statistical design approach and the cloud attenuation was introduced using Mie theory together with empirical Log-Normal modeling. ...
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