Saturation in cascaded optical amplifier free-space optical communication systems

Oluwatosin Jeremiah Bandele; Priyanka Desai; Malcolm. S. Woolfson; Andrew Julian Phillips

Saturation in cascaded optical amplifier free-space optical communication systems

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Author(s): Oluwatosin Jeremiah Bandele ¹ ; Priyanka Desai ² ; Malcolm. S. Woolfson ¹ ; Andrew Julian Phillips ¹
- Affiliations: 1: Department of Electrical and Electronic Engineering, Faculty of Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, UK ;
  2: Faculty of Engineering, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
Source: Volume 10, Issue 3, June 2016, p. 71 – 79
DOI: 10.1049/iet-opt.2015.0083 , Print ISSN 1751-8768, Online ISSN 1751-8776

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Received 27/07/2015, Accepted 07/10/2015, Revised 22/09/2015, Published 01/06/2016

The performance of a free-space optical (FSO) communication system in a turbulent atmosphere employing an optical amplifier (OA) cascade to extend reach is investigated. Analysis of both single and cascaded OA FSO communication links is given and the implications of using both adaptive (to channel state) and non-adaptive decision threshold schemes are analysed. The benefits of amplifier saturation, for example in the form of effective scintillation reduction when a non-adaptive decision threshold scheme is utilised at the receiver for different atmospheric turbulence regimes, are presented. Monte Carlo simulation techniques are used to model the probability distributions of the optical signal power, noise and the average bit error rate due to scintillation for the cascade. The performance of an adaptive decision threshold is superior to a non-adaptive decision threshold for both saturated and fixed gain preamplified receivers and the ability of a saturated gain OA to suppress scintillation is only meaningful for system performance when a non-adaptive decision threshold is used at the receiver. An OA cascade can be successfully used to extend reach in FSO communication systems and specific system implementations are presented. The optimal cascade scheme with a non-adaptive receiver would use frequent low gain saturated amplification.

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