Comparative Analysis of Point to Point FSO System Under Clear and Haze Weather Conditions

Abstract

Free space optics (FSO) is an optical mean of communication where free space acts as a medium between transmitter and receiver and both should be in the line of sight for successful transmission of signal. Free space can be air, outer space, or vacuum. This system is economically beneficial than other systems and deployed in a matter of hours. This system poses great advantages like high bandwidth. There are some factors which can affect the transmission in FSO. Presence of foreign elements like rain, fog, and haze, physical obstruction, scattering and atmospheric turbulence are some of these factors. In this paper, two FSO links are designed and compared using WDM to study under clear and haze weather conditions. The present system supports the transmission up to longer link distances of 350 and 47 km under clear weather and haze conditions respectively.

Design and performance evaluation of a 350 m free space optical communications link for pico-macrocell backhauling

“…The particles distribution present in the atmosphere constitutes the atmospheric attenuation and its coefficient depends on the level of visibility at a time. Two most popular methods of getting attenuation values are through temporary site installation [13] and observing system performance or using empirically based models of Kim and Kruse which are dependent on the visibility levels to do mathematical analysis. The Kim and Kruse models provides the specific attenuation (∝) as [22]:…”

“…This weather condition is more prevalent in the tropical regions of the world. It is calculated using the Kim and Kruse model as in (2) [27] and the value for a heavy haze condition based on visibility level is given as 2.37 dB/km [2], [13], [20], [22].…”

“…Research on the design and performance investigation of FSOC links considering various weather conditions and atmospheric turbulences was reported in literature. Malik and Singh [13] designed and evaluated the performance of two FSOC systems at 2.5 Gbps data rate under heavy and light haze, very clear and clear atmospheric conditions. Simulation results indicated that the Q-factor and bit error rate (BER) of each link deteriorates due to effects of atmospheric attenuation and link distances.…”

Enhanced Spectrum Slicing--Wavelength Division Multiplexing Approach for Mitigating Atmospheric Attenuation in Optical Communication

“…As this technique supports a higher data rate, it requires the implementation of higher-order modulation. A spectrum parted with spacing that is not equal and added multiple ports in the de-multiplexer for nding the spectrum performance and e ciency of the channel (Malik and Singh, et al 2015).…”

“…To meet the demand of services, there is a huge requirement of bandwidth; WDM-FSO is the leading and well-known technique for broadband transmission (Singh and Saini 2014). But apart from these bene ts, WDM has its own set of drawbacks such as high operation cost and higher complexity (Saini and Wason 2019;Malik and Singh 2015;Singh et al 2012). To nd a solution to these limitations, spectrum slicing technology is used over the WDM, where the spectrum slicing technique has an operation that does have less complexity when compared with WDM (Nor et al 2011).…”