• Frontiers of Optoelectronics
  • Vol. 12, Issue 2, 197–207 (2019)
Jeremiah O.1、*, Malcolm WOOLFSON2, and Andrew J.2
Author Affiliations
  • 1Department of Electrical, Electronics and Computer Engineering, College of Engineering, Afe Babalola University, Ado-Ekiti, Ekiti State, P.M.B 5454, Nigeria
  • 2Department of Electrical and Electronic Engineering, Faculty of Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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    Abstract

    The performance of a wavelength-division multiplexing (WDM) free-space optical (FSO) communication system in a turbulent atmosphere employing optical amplifiers to improve capacity is investigated, in the presence of amplified spontaneous emission noise, scintillation, beam spreading, atmospheric attenuation and interchannel crosstalk. Using on-off keying modulation, Monte Carlo simulation techniques are used to obtain the average bit error rate and system capability due to scintillation and the effect of introducing a power control algorithm (PCA) to the system is investigated. The PCA ensures that at any receiving instant, the same turbulencefree powers are received by all the receiving lenses. The performance of various WDM FSO communication system configurations such as non-amplified systems with an adaptive decision threshold (NOAADT), nonamplified systems with a non-adaptive decision threshold, fixed gain amplified systems with an adaptive decision threshold, fixed gain amplified systems with a nonadaptive decision threshold and saturated gain amplified systems with a non-adaptive decision threshold (SOANADT) are investigated. Results obtained show that the SOANADT is superior to the NOAADT and the PCA is only beneficial in amplified systems.
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    Jeremiah O., Malcolm WOOLFSON, Andrew J.. Saturation in wavelength-division multiplexing free-space optical communication systems[J]. Frontiers of Optoelectronics, 2019, 12(2): 197
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    Received: May. 30, 2018
    Accepted: Jul. 18, 2018
    Posted: Feb. 1, 2019
    Published Online: Nov. 14, 2019
    The Author Email: O. Jeremiah (jbandele@abuad.edu.ng)