WDM could be used to achieve higher transmission rates and keep same physical components of FSO link. The transfer rate of an physical optical link could be increased with using of multichannel technology WDM (Wavelength Division Multiplex). Therefore it is important count with sufficient reserve during design of wireless link. It can even caused loss of visibility between FSO heads and thus there would be a disintegration connection. Another problem is constantly changing weather, the worst factor is fog, which caused high attenuation. One of them is influence of atmospheric environment such as absorption, scattering and turbulences which change structural refractive index. This system is physically limited with short distance in the range of unit of km, so it can be used for last-mile communication or communication between buildings. Data rate and cost effectivity have developed rapidly over several years.
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FSO has several advantages which include unlicensed band, easy to install and low-cost. The Free Space Optic (FSO) link consists of two optical heads containing optical transmitter and the receiver. There is obtained the influence of crosstalk and modulation format for the BER, depending on the amount of turbulence in the propagation medium. Simulated FSO link used wavelength of 1550 nm with 0.8 nm spacing. For simulation some parameters were set according to real FSO link such as the datarate 1.25 Gbps, link range 1.4 km. Simulation software OptiSystem 14 was used for tasting. Here we will be dealing with modulation schemes OOK (On-Off keying), QAM (Quadrature Amplitude Modulation) and Subcarrier Intensity Modulation (SIM) based on a BPSK (Binary Phase Shift Keying). The behavior FSO link was tested for one or eight channels. There is considered only the one direction. In FSO communication occurs due to the influence of atmospheric effect (attenuation, and fluctuation of the received power signal, influence turbulence) and the WDM channel suffers from interchannel crosstalk.
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In this article the author’s team deals with using Wavelength Division Multiplexing (WDM) for Free Space Optical (FSO) Communications.