A Review on Free Space Optical Communication System

  • Md Zubair Rahman et al.
Keywords: Free Space Optics (FSO), Optical Wireless Communication, Modulation Techniques, On-Off Keying (OOK), Binary Phase Shift Keying (BPSK), Differential Phase Shift Keying (DPSK).

Abstract

Introduction: Optical wireless solutions are becoming increasingly popular due to their potential for high-speed data transmission. However, atmospheric turbulence can significantly degrade signal performance in Free Space Optical (FSO) communication channels. To ensure efficient data transmission, selecting the optimal modulation scheme is crucial. This study focuses on evaluating different modulation techniques to determine the most effective approach for FSO systems.

Objectives: The primary objective of this research is to examine the best modulation technique for FSO communication systems operating in an FSO channel. The study aims to compare the energy efficiencies, bandwidth efficiencies, Bit Error Rate (BER), and Signal-to-Noise Ratio (SNR) of four modulation schemes: On-Off Keying (OOK), Binary Phase Shift Keying (BPSK), Differential Phase Shift Keying (DPSK), and Quadrature Phase Shift Keying (QPSK).

Methods: A comparative analysis was conducted by evaluating the performance of the selected modulation schemes under standard FSO conditions. The study initially assessed their performance in the absence of atmospheric turbulence, focusing on energy and bandwidth efficiency, BER, and SNR. Additionally, the impact of turbulence was analyzed using a Gamma-Gamma turbulence channel to observe intensity scintillation effects on BER performance.

Results: Numerical studies revealed that BPSK and QPSK outperform OOK and DPSK in terms of BER performance and power consumption. Under turbulent conditions modeled by the Gamma-Gamma channel, the BER performances of BPSK and QPSK were nearly identical. BPSK, in particular, demonstrated strong resistance to turbulence, making it a highly suitable modulation scheme for FSO communication.

Conclusion: FSO communication systems can benefit from using BPSK due to its superior resistance to atmospheric turbulence. The study highlights that among the evaluated modulation schemes, BPSK and QPSK offer the best performance in terms of BER and power efficiency, making them the preferred choices for reliable FSO communication.

Author Biography

Md Zubair Rahman et al.

Dr Md Zubair Rahman A M J1, Ananthan M2, Rajesh Kumar R3,
1 Professor, 2Assistant Professor ,3Final Year M.E. VLSI Design
Department of Electronics and Communication Engineering, Al-Ameen Engineering College (Autonomous), Erode – 638 104, Tamilnadu, India.

Published
2024-02-04
Issue
Volume 2024
Section
Regular Issue

Letters in High Energy Physics (LHEP) is an open access journal. The articles in LHEP are distributed according to the terms of the creative commons license CC-BY 4.0. Under the terms of this license, copyright is retained by the author while use, distribution and reproduction in any medium are permitted provided proper credit is given to original authors and sources.

Terms of Submission

By submitting an article for publication in LHEP, the submitting author asserts that:

1. The article presents original contributions by the author(s) which have not been published previously in a peer-reviewed medium and are not subject to copyright protection.

2. The co-authors of the article, if any, as well as any institution whose approval is required, agree to the publication of the article in LHEP.