Terrestrial free space optical communications in Bangladesh: transmission channel characterization

Abstract

This research work focused on transmission channel characterization of Free-Space-Optical (FSO) communications technology for deploying in the developing country like Bangladesh. To meet the tremendous amount of data traffic, mobile operators and ISPs need better solution than the existing RF and fiber optic communications. Moreover, Bangladesh is entering in the era of satellite communications by launching its own satellite. So, Bangladesh needs such communication technology that provides higher channel bandwidth, sophisticated transmission security and can cope channel dispersion. FSO is a good candidate that can meet all these features. The transmission channel characterization plays a significant role in optimizing the performance of FSO link. In this work, the channel characterization of FSO technology from the weather perspective of Bangladesh has been investigated thoroughly. The obtained results show that the atmospheric scattering effect does not hamper the short range FSO link performance, whereas, the atmospheric turbulence effect is not favorable to deploy FSO technology with reasonable quality signal unless it is optimized properly using antenna aperture averaging technique.

Performance analysis of free space optical communication system under rain weather conditions: a case study for inland and coastal locations of India

“…The study conducted by Haider et al has studied the impact of rain on the feasibility of FSOC links in Bangladesh. Seven cities of Bangladesh namely, Dhaka, Rajshahi, Chittagong, Sylhet, Rangpur, Mymensingh and Barisal have been considered for this study (Shahiduzzaman et al 2019). The meteorological data related to rainfall intensity of all locations from January, 2013 to June, 2016 have been collected from Bangladesh Meteorological Department.…”

Analysis and simulations of optimal geometry shapes of the 4 and 9 nano hole arrays (NHAs) with surface plasmonics and optical properties of biosensors systems

“…Some geometrical coefficients like a thickness of metal and substrate; the hole diameter also the number of periodic holes and metal properties can effect on EOT spectra because the surface plasmons that will be excited by incident light is affected by changing the size of hole and it have been confirmed that any change in the size of the holes lead to a small variations in transmission efficiency and peak [11][12][13][14][15]. Je Hong provided that the transmission characteristics is a function of film thickness of metallic hole array samples which is prepared with different hole periodicity, size and shape on a silica substrate and shows highly transmission efficiency at small thickness of gold metal [16,17].…”

Analysis of Scintillation Effects on Free Space Optical Communication Links in South Africa

“…The 2 n C , which is also dependent on the root-mean-square (RMS) wind speed and altitude of a location, is used to characterize atmospheric turbulence as weak, moderate or strong at any point in time [27][28][29][30]. Most of the results obtained in literature [6,[10][11][12][13]20,23,[31][32][33] assume arbitrary 2 n C values or estimate them based on average wind speed measurements for a particular location. In some cases, worst case scenarios of atmospheric turbulence based on the maximum values of wind speed are investigated [29,33].…”

“…Most of the results obtained in literature [6,[10][11][12][13]20,23,[31][32][33] assume arbitrary 2 n C values or estimate them based on average wind speed measurements for a particular location. In some cases, worst case scenarios of atmospheric turbulence based on the maximum values of wind speed are investigated [29,33]. However, these measurements are based on data spanning less than 4 years.…”