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Frontiers of Optoelectronics

Front Optoelec    2013, Vol. 6 Issue (3) : 312-317     DOI: 10.1007/s12200-013-0332-z
RESEARCH ARTICLE |
Impact of polarization mode dispersion and nonlinearities on 2-channel DWDM chaotic communication systems
Bushra NAWAZ, Rameez ASIF()
Telecommunication Engineering Department, University of Engineering & Technology, Taxila 47050, Pakistan
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Abstract

This paper has designed 2-channel dense wavelength division multiplexing (DWDM) chaotic system at the frequencies of 193.1 and 193.2 THz, respectively. The optical chaotic signals were produced by using the semiconductor laser that is numerically modeled by employing laser rate equations. These two channels were multiplexed and then propagated through single mode optical fiber (SMF) of 80 km length with dispersion compensating fiber of 16 km length. Erbium doped fiber amplifier (EDFA) was used to compensate the power losses in the SMF. In this paper, we investigated the effects of polarization mode dispersion (PMD) and nonlinearities especially stimulated Raman scattering (SRS) on 2 channel DWDM chaotic communication system by varying the length of the SMF and value of differential group delay (DGD).

Keywords chaos      chaotic signal      chaotic synchronization      dense wavelength division multiplexing (DWDM) chaotic communication      polarization mode dispersion (PMD)      stimulated Raman scattering (SRS)     
Corresponding Authors: ASIF Rameez,Email:rameez.asif@uettaxila.edu.pk   
Issue Date: 05 September 2013
 Cite this article:   
Bushra NAWAZ,Rameez ASIF. Impact of polarization mode dispersion and nonlinearities on 2-channel DWDM chaotic communication systems[J]. Front Optoelec, 2013, 6(3): 312-317.
 URL:  
http://journal.hep.com.cn/foe/EN/10.1007/s12200-013-0332-z
http://journal.hep.com.cn/foe/EN/Y2013/V6/I3/312
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Bushra NAWAZ
Rameez ASIF
symbolparametervalue
a0active layer coefficient1.5e-9
vggroup velocity8.5e9 cm/s
?gain compression factor1e-17 cm3
Ntcarrier density transparency1e18 cm-3
βfraction of spontaneous emission coupled into the lasing mode8e-7
Γmode confinement factor0.4
Vactive layer volume1.5e-10 cm3
τpphoton life time3e-12 s
τNelectron life time1e-9 s
Aline width enhancement factor5
Tab.1  Values of parameters of semiconductor laser
Fig.1  Block diagram of chaotic DWDM system
Fig.2  Chaotic signal at transmitter (a) and receiver (b)
Fig.3  Synchronization graphs with parameter of PMD at (a) 0; (b) 0.5 and (c) 1.0 ps/km
Fig.4  Synchronization graphs with parameter of PMD at (a) 0; (b) 0.5 and (c) 1.0 ps/km including nonlinear effects
Fig.5  Frequency spectrum showing SRS
Fig.6  Correlation coefficient versus distance. (a) Only PMD effects; (b) both PMD and nonlinear effects
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