A dual optical wireless test link works with two different optical wavelengths in spectral windows of 850 nm and
1550 nm. The transceivers of the link are placed on the highest peak of the Czech Central Mountains (Milesovka
Mountain) so that the transmission path is oriented almost in a vertical direction. The installation site is situated in a
locality with the harshest climate in the Czech Republic with extreme attenuation conditions. The almost vertically
oriented path of the link allows analyzing the impact of the different atmospheric layers on the signal transmission. The
monitoring of the received power and the archiving of the appropriate data are constantly provided. The relationship
between the link attenuation and the atmospheric visibility has been investigated. The results of this experiment are
presented.
This work deals with a review of the possible principles and construction of the terrestrial optical wireless links and the
problematic of the proper photodiode and laser diode selection according to the wavelength dependent atmospheric
transmittance and the photodiode sensitivity. For the calculations we used the power balance equations and the catalog
values of the available laser diodes and detectors. For the most commonly used free space optical links, the laser diode
price and the maximum power are also considered.
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