Saturation in wavelength-division multiplexing free-space optical communication systems

doi:10.1007/s12200-018-0838-5

Front. Optoelectron.

2019, Vol. 12

Issue (2) : 197-207 https://doi.org/10.1007/s12200-018-0838-5

RESEARCH ARTICLE

Saturation in wavelength-division multiplexing free-space optical communication systems

Jeremiah O. BANDELE¹(

), Malcolm WOOLFSON², Andrew J. PHILLIPS²

¹. Department of Electrical, Electronics and Computer Engineering, College of Engineering, Afe Babalola University, Ado-Ekiti, Ekiti State, P.M.B 5454, Nigeria
². Department 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 turbulence-free 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), non-amplified systems with a non-adaptive decision threshold, fixed gain amplified systems with an adaptive decision threshold, fixed gain amplified systems with a non-adaptive 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.

Keywords wavelength-division multiplexing (WDM) free-space optical (FSO) communication crosstalk optical amplifier (OA) gain saturation decision threshold

Corresponding Author(s): Jeremiah O. BANDELE

Just Accepted Date: 08 August 2018 Online First Date: 13 September 2018 Issue Date: 03 July 2019

Cite this article:

Jeremiah O. BANDELE,Malcolm WOOLFSON,Andrew J. PHILLIPS. Saturation in wavelength-division multiplexing free-space optical communication systems[J]. Front. Optoelectron., 2019, 12(2): 197-207.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-018-0838-5
https://academic.hep.com.cn/foe/EN/Y2019/V12/I2/197

Fig.1 A WDM FSO communication system (upstream transmission)

parameter	symbol	value
desired signal wavelength	$λ s i g$	1550.12 nm
crosstalk signal wavelength	$λ x t$	1550.92 nm
bit rate	$R b$	2.5 Gb/s
OBPF bandwidth	$B o p t$	76 GHz
noise figure	$N F$	5 dB
quantum efficiency	$η$	0.8
extinction ratio	$r$	10 dB
transmitted optical power (maximum permitted)	$P t$	10 dBm
OA small signal gain	$G s s$	25 dB
feeder fiber length	$D f i b r e$	20 km
feeder fiber loss	$α D f i b r e$	0.2 dB/km
atmospheric channel loss	$α D f s o$	0.2 dB/km (clear air)
receiving lens diameter	$d r x$	4 cm
beam divergence angle	$φ$	1 mrad

Tab.1 Parameters used for the simulations

Fig.2 Average BER against link length in WDM FSO communication systems (

L d e m u x

= 15 dB). (a) No PCA; (b) with PCA

Fig.3 Average BER at various link lengths for WDM FSO communication systems without a PCA (

L d e m u x

= 30 dB). (a) NOAADT; (b) NOANADT; (c) FOAADT; (d) FOANADT; (e) SOANADT

Fig.4 Capability of WDM FSO communication systems (

L d e m u x

= 30 dB and target BER= 10^-¹²). (a) NOAADT, no PCA; (b) NOAADT, with PCA; (c) NOANADT, no PCA;(d) NOANADT, with PCA; (e) FOAADT, no PCA; (f) FOAADT, with PCA; (g) FOANADT, no PCA; (h) FOANADT, with PCA; (i) SOANADT, no PCA; (j) SOANADT, with PCA

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