BER performance analysis of radio over free-space optical systems considering laser phase noise under Gamma-Gamma turbulence channels

Wansu Lim; Changho Yun; Kiseon Kim

doi:10.1364/oe.17.004479

BER performance analysis of radio over free-space optical systems considering laser phase noise under Gamma-Gamma turbulence channels

Opt Express. 2009 Mar 16;17(6):4479-84. doi: 10.1364/oe.17.004479.

Authors

Wansu Lim¹, Changho Yun, Kiseon Kim

Affiliation

¹ Department of Information and Communications, Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro(Oryong-dong), Buk-gu, Gwangju 500-712 Korea. wansu99@gist.ac.kr

PMID: 19293875
DOI: 10.1364/oe.17.004479

Abstract

This paper analytically investigates a bit error rate (BER) performance of radio over free space optical (FSO) systems considering laser phase noise under Gamma-Gamma turbulence channels. An external modulation using a dual drive Mach-Zehnder modulator (DD-MZM) and a phase shifter is employed because a DD-MZM is robust against a laser chirp and provides high spectral efficiency. We derive a closed form average BER as a function of different turbulence strengths and laser diode (LD) linewidth, and investigate its analytical behavior under practical scenario. As a result, for a given average SNR with normalized perturbation, it is shown that the difference of average BER corresponding to two LDs (with linewidth of 624 MHz and 10 MHz) under weak turbulence is almost 3 times larger than that under strong turbulence.

Publication types

Research Support, Non-U.S. Gov't