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Tytuł pozycji:

DESIGN, SIMULATION AND TESTING OF THE OOK NRZ MODULATION FORMAT FOR FREE SPACE OPTIC COMMUNICATION IN A SIMULATION BOX.

Tytuł :
DESIGN, SIMULATION AND TESTING OF THE OOK NRZ MODULATION FORMAT FOR FREE SPACE OPTIC COMMUNICATION IN A SIMULATION BOX.
Autorzy :
VANDERKA, Ales
HAJEK, Lukas
LATAL, Jan
VITASEK, Jan
KOUDELKA, Petr
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Temat :
FREE-space optical technology
SIMULATION methods & models
RADIO detectors
OPTICAL signal detection
PHOTODETECTORS
DATA transmission systems
Źródło :
Advances in Electrical & Electronic Engineering; 2014 Special Issue, Vol. 12 Issue 6, p604-616, 13p
Czasopismo naukowe
This article deals with the construction of a modulator and demodulator for Free-Space Optical (FSO) communication. In FSO optics, the modulated optical signal is propagated in the constantly changing environment (atmosphere). The optical signal is strongly influenced by the actual composition of air, which is directly linked to the change in refractive index in the turbulent cells. This article examines primarily the appropriate modulation format for FSO. For this purpose, one type of an OOK-NRZ modulator and one type of a demodulator were designed. This article also describes the construction of two types of photo detectors (the high impedance and the transimpedance ones). All electronic constructions were tested in the Micro-Cap simulator and they were experimentally measured as well. For the OOK NRZ modulation the, maximum transmission speed achieved the value of 160 Mbps. Measuring the quality of the modulation formats was carried out under mechanical and thermal turbulences. The last part of this work gives the results of the measurements of fog influences. [ABSTRACT FROM AUTHOR]
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