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Frontiers of Optoelectronics

Front. Optoelectron.    2019, Vol. 12 Issue (2) : 197-207
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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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.
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Fig.1  A WDM FSO communication system (upstream transmission)
parameter symbol value
desired signal wavelength λsig 1550.12 nm
crosstalk signal wavelength λxt 1550.92 nm
bit rate Rb 2.5 Gb/s
OBPF bandwidth Bop t 76 GHz
noise figure NF 5 dB
quantum efficiency η 0.8
extinction ratio r 10 dB
transmitted optical power (maximum permitted) Pt 10 dBm
OA small signal gain Gss 25 dB
feeder fiber length D fibre 20 km
feeder fiber loss αD fibre 0.2 dB/km
atmospheric channel loss αD fso 0.2 dB/km (clear air)
receiving lens diameter drx 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 demux = 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 demux = 30 dB). (a) NOAADT; (b) NOANADT; (c) FOAADT; (d) FOANADT; (e) SOANADT
Fig.4  Capability of WDM FSO communication systems ( Lde mux = 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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