Abstract
Atmospheric disturbances due to randomly distributed wind flow and temperature results in fluctuation of intensity as well as in the phase of the received light signal, impairing an optical wireless link performance. In this work, turbulence-induced scintillation on Optical Wireless Communication (OWC) is investigated experimentally on the basis of optimized signal wavelength, link length and launched power level. To mimic the outdoor environmental conditions, an indoor chamber equipped with fans and heating coil is made up, which gives manual control of the temperature and wind velocity within the chamber. The received signal bearing data rate of 100 Mbps is measured after traversing through the designed chamber and used to characterize the turbulence strength in terms of scintillation index (S.I.). To establish a long-range OWC link, the atmospheric channel length is increased using round-trip reflection by placing plane front surface mirrors at both ends of the chamber, also front concave mirror is used to collect distributed irradiance onto aperture area of the detector at the receiver. Experimentally, we have tried to characterize the combined effect of the wind and the temperature on the free space communication system. Various communication metrics like bit error rate (BER), signal to noise ratio (SNR) and Q factor have been evaluated and it is reported that the BER performance of an OWC link having wind flow of 15 km/h gets degraded by 109 as compared to still air.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call