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This extended abstract proposes an FPGA-based concept for real time channel emulation (CE) adapted for visible light communication (VLC) applications. Crucial insights into the optical channel modeling techniques as well as the important blocks of CE are described. Furthermore, the paper details the CE operation principle enhanced with the necessary mathematical background. Finally, the paper outlines...
The paper is focused on analysing of the distribution of optical intensity within a laser beam at the focal plane of the receiving optics which is affected mainly by diffraction of the optical wave in the Schmidt-Cassegrain telescope. The paper discusses the differences between diffraction of the optical wave on circular and annular aperture. In order to simplify the model of diffraction the Schmidt-Cassegrain...
The paper deals with a time-domain model for generating random time series of received optical power and angle-of-arrival for the simulation of terrestrial Free-Space Optical systems under the influence of atmospheric turbulence. Based on the closed-form turbulence theory the time series are generated by means of suitable filtering of generated random numbers. The simulator of received optical power...
The optical digital to analog converter (ODAC) concept is introduced to be used in an intelligent transportation system (ITS). The paper explores the performance of ODAC adapted into a traffic light head in order to enable transferring information from the infrastructure to the vehicle (I2V). The performance of such a scenario is shown by reconstructing error as a function of emitter placement, LED's...
The paper deals with numerical modeling of the testbed for measuring the coupling efficiency of the fully photonic receiver for optical wireless communication. The numerical model is based on transformation of the Gaussian beam through optical system described by ray matrices. The design process of the testing transmitter and fully photonic receiver is discussed. Finally the coupling efficiency of...
The paper deals with terrestrial optical wireless links operating with coherent laser beams. The contribution discusses the full photonic transceiver concept (transmitter and receiver). Two main types of optical wireless links are mentioned: test link and data link. The purely photonic concept of the links with its advantages over the conventional concept is presented and discussed. The modeling of...
In the paper, an optical wireless link for point-to-point communication is analyzed. Its main focus is the analysis of the influence of various misalignments on the received power. Analysis includes influence of the tilt of the transmitter and the receiver as well as their mutual misalignment respecting the Gaussian intensity distribution of the transmitted beam in terms of geometrical optics. As...
Free space optical (FSO) communication links offer a number of advantages over radio frequency links. Main advantages of FSO communication links are electromagnetic compatibility, license-free band and high data rate. However, reliability of these links is highly dependent on atmospheric and weather conditions. An optical wave propagating through the atmospheric transmission media is very sensitive...
This work is focused on the quick determination of characteristics of the atmospheric transmission media in optical band. Optical wireless links are briefly introduced. Two of the most important effects influencing optical signal properties in the atmosphere are shortly described. The goal of the work is in analysis of optical intensity profile. Due to the changes in the intensity profile we are able...
This paper deals with the influence of atmospheric turbulence on the rangefinder laser beam. Analogous to the optical wireless links, turbulent flow causes optical intensity variation at the receiver plane. In optical communication, most problems namely at longer distances, are caused by beam scintillation and by beam wandering. In range finding systems, a strong influence from irradiated surfaces...
This work is focused on the optical wireless links working in turbulent atmospheric transmission media. A phenomenon of atmospheric turbulence is briefly introduced and relative variance of optical intensity in laser beam profile is presented. The goal of this paper is to determine the distribution of optical intensity relative variance in laser beam profile. According to the experimental results...
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