Title: Design and study of high bit-rate free-space optical communication system employing QPSK modulation

Authors: Bijayananda Patnaik; P.K. Sahu

Addresses: School of Electrical Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar 751013, India ' School of Electrical Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar 751013, India

Abstract: We have proposed Free-Space Optics systems (FSO), which are Diffused Link (DL) and Line-of-Sight (LOS) setup using Quadrature Phase Shift Keying (QPSK) technique. The optimized coverage distance, for an input power level of 5 dBm and data rate of 1 Gbps, is found to be 1036.307m and 2388.725km for DL and LOS setup respectively. Also, the proposed system is simulated for 1.25 Gbps, 2.5 Gbps, 10 Gbps, 40 Gbps and 100 Gbps with free-space attenuation of 200 dB/km using Optisystem 9.0 and Matlab 7.9.0. The system will be useful where the coverage area, performance, security and cost-savings are critical factors.

Keywords: free-space optics; diffused link setup; line-of-sight setup; bit error rate; wireless sensor networks; WSNs; Q-factor; optical communications; QPSK modulation; quadrature phase shift keying.

DOI: 10.1504/IJSISE.2013.051501

International Journal of Signal and Imaging Systems Engineering, 2013 Vol.6 No.1, pp.3 - 8

Received: 05 Feb 2011
Accepted: 08 Apr 2011

Published online: 20 Jan 2013 *

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