Enhanced Performances of SAC-OCDMA System by Using Polarization Encoding

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Ahmed Garadi ◽  
Boubakar S. Bouazza ◽  
Abdelkader Bouarfa ◽  
Khansae Meddah
Keyword(s):  
Optical Communication ◽  
Bit Error Rate ◽  
Multiple Access ◽  
Cross Correlation ◽  
Spectral Amplitude ◽  
Orthogonal Polarization ◽  
Optical Communication System ◽  
One Dimensional ◽  
Polarization Encoding ◽  
The One

Abstract This article presents a novel encoder technique of spectral amplitude coded multiple access (SAC-OCDMA) systems. The proposed technique is based on two orthogonal polarization states of the same one dimensional optical code. This method is usually applied to increase the number of simultaneous users in a network, and it can double the number of potential users against the one-dimensional code. The results obtained in this work show that optical zero cross-correlation code can accommodate more users simultaneously for the typical bit error rate of optical communication system of ${\ }{10^{ - 9}}$ .

scholarly journals Performance analysis of spectral/spatial of OCDMA system using 2D hybrid ZCC/MD code

2019 ◽  
Vol 13 (2) ◽  
pp. 569
Author(s):  
Rima. Matem ◽  
S. A. Aljunid ◽  
M. N. Junita ◽  
C.B.M Rashidi ◽  
Israa Shihab Aqrab
Keyword(s):  
Multiple Access ◽  
Cross Correlation ◽  
Multiple Access Interference ◽  
Spectral Amplitude ◽  
Correlation Property ◽  
Two Dimensional ◽  
One Dimensional ◽  
Spectral Amplitude Coding ◽  
The One ◽  
Optical Coding

This paper proposes a new spectral/spatial code for Spectral Amplitude Coding in Optical Coding Division Multiple Access (SAC-OCDMA) called two-Dimensional hybrid ZCC/MD code. The new code combines two of the one –dimensional codes which are Zero Cross Correlation (1D ZCC) and Multi-Diagonal code (1D MD). Moreover, it produces a zero cross correlation property for each code. The main goal of this proposed code is to mitigate Phase Induced Intensity Noise and eliminate Multiple Access Interference (MAI). This proposed code can provide a better performance comparing to other codes as 2D FCC/MDW and 2D DPDC according to the obtained numerical analysis.

scholarly journals An Efficient Method to Reduce an MAI’s Effect in Spectral Amplitude Coding OCDMA Network

2017 ◽  
Vol 2 (6) ◽  
pp. 1
Author(s):  
Kamal Elsiddig Amaseb ◽  
Hassan Yousif Ahmed ◽  
Medien Zeghid
Keyword(s):  
Optical Communication ◽  
System Performance ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Multiple Access Interference ◽  
Spectral Amplitude ◽  
Integer Number ◽  
Quadratic Congruence ◽  
Spectral Amplitude Coding ◽  
Code Division Multiple

Multiple access interference (MAI) in spectral-amplitude coding, optical code division multiple access (SAC-OCDMA) scheme hardly limits the system performance. This problem increases proportionally with the amount of concurrent users. In addition, phase induces intensity noise (PIIN) coming from the spontaneous emission process of light source is extra impairment leads to system drop needs to be tackled too. Towards overcome the specified problems, vector combinatorial (VC) codes which based on grouping of certain vectors is proposed. Any positive integer number can be used in both weighs and user parameters in code building procedure, these technique nominees our code to be a potential reliable applicant for future optical communication schemes. Such flexibility is an exceptional property for VC compared to SAC-OCDMA counterparts’ codes. Compared with the systems employing Hadamard, Modified Frequency Hopping (MFH), Modified Quadratic-Congruence (MQC), and Modified Double Weight (MDW), numerical results show that, the VC is effective to reduce the power of MAI and PIIN. It has been exposed that, performance can be superior significantly when VC is used.

scholarly journals TODCOR: A Two-Dimensional Correlation of a Composite Spectrum to Derive the Radial Velocities of its Components

1992 ◽  
Vol 135 ◽  
pp. 164-166
Author(s):  
Tsevi Mazeh ◽  
Shay Zucker
Keyword(s):  
Radial Velocity ◽  
Cross Correlation ◽  
Radial Velocities ◽  
Two Dimensional ◽  
One Dimensional ◽  
Independent Variables ◽  
Doppler Shifts ◽  
Correlation Algorithm ◽  
Potential Difficulty ◽  
The One

Cross correlation is a frequently used technique to obtain the Doppler shifts of digitized celestial spectra. This method, suggested by Tonry & Davis (1979), cross correlates the observed spectrum against an assumed template, and obtains the stellar radial velocity by the location of the correlation maximum (Wyatt 1985). The technique finds the correct radial velocity even for extremely low S/N spectra.Spectra composed of two components present a potential difficulty to this technique. The cross correlation of these spectra usually displays a double peak which can not be resolved whenever the relative velocity of the two components is small. To overcome this difficulty, we developed TODCOR — a new TwO-Dimensional CORrelation algorithm which can simultaneously derive the Doppler shifts of the two components.TODCOR assumes that the observed spectrum is a combination of two known spectra with unknown shifts. Following the one-dimensional technique, the algorithm calculates the correlation of the observed spectrum against a set of combinations of two templates, with all possible shifts. The correlation, thus, is a two-dimensional function, whose two independent variables are the radial velocities of the two components. The location of the maximum of this function corresponds to the actual Doppler shifts of the two components.

scholarly journals Impact of Optical Booster to Enhance the Gain Bandwidth for Dense Optical Communication System

2019 ◽  
Vol 7 (1) ◽  
pp. 42-46
Author(s):  
Ghanendra Kumar ◽  
◽  
Chakresh Kumar ◽  
Keyword(s):  
Optical Communication ◽  
Bit Error Rate ◽  
Error Rate ◽  
Communication System ◽  
Optical Communication System ◽  
Gain Bandwidth ◽  
Non Linear ◽  
Flat Gain ◽  
Fiber Components

This paper explains how the combination of RAMAN and PARA-METRIC amplifier using non-linear fiber components increases the gain bandwidth. Two kinds of configuration of amplifier are demonstrated with gain associated and bit error rate is seen. 15 db gain is measured and flat gain of 5db is measured.

scholarly journals Enhancement of optical code division multiple access system based on 2D ZCC/MD spectral/spatial code

2019 ◽  
Vol 14 (2) ◽  
pp. 661
Author(s):  
Rima Matem ◽  
S. A. Aljunid ◽  
M. N Junita ◽  
C. B. M Rashidi ◽  
Israa Shihab Aqrab
Keyword(s):  
Code Division Multiple Access ◽  
Multiple Access ◽  
Cross Correlation ◽  
Spatial Code ◽  
Two Dimensional ◽  
Effective Power ◽  
One Dimensional ◽  
Access System ◽  
Code Division Multiple ◽  
Multiple Access System

<span>The combination of 1D zero cross correlation (ZCC) and 1D Multi Diagonal (MD) results a new two dimensional hybrid called 2D ZCC/MD code for spectral/spatial OCDMA system. The proposed code aims to enhance the functional qualities of Optical Code Division Multiple Access (OCDMA) and to overcome the limitations of one dimensional codes. In this paper,   2D ZCC/MD is evaluated at data rate; 622Mbps.  A comparison of the proposed 2D ZCC/MD code to 1D Random Diagonal (RD) and 1D Modified Double Weight (MDW) highlight that 2D ZCC/MD  can support  a large number of active  users even at the higher user bit rate. Furthermore, in term of effective power 2D ZCC/MD can achieve lower effective power.</span>

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