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Open AccessJournal ArticleDOI

Development of Multi-Service (MS) for SAC-OCDMA systems

Majid H. Kakaee, +4 more
- 01 Aug 2014 - 
- Vol. 60, pp 49-55
TLDR
Results show that by choosing code weight of 4 and optimizing number of users per sequence, the MS code supports up to 82 users, each operating at a bit-rate of 622 Mbps with reference to the Bit Error Rate (BER) of 10−9.
Abstract: 
A Multi-Service Optical Code Division Multiple Access (MS-OCDMA) code based on Spectral Amplitude Coding (SAC) is proposed in this paper. The advantage of proposed code on setting a variable number of users in a basic code matrix with a fixed code weight makes it more flexible in generating codewords. The appropriate quality of service required for various network applications can be provided by choosing a different number of users for the basic code matrix of MS code. The properties of the proposed code is compared with other OCDMA codes in terms of code length and maximum cross-correlation. The performance of the MS code mathematically analysed and probability of error for users is plotted as a function of the number of active users and optical received power. Shot, phase induced intensity and thermal noises are considered in mathematical analysis. Results show that by choosing code weight of 4 and optimizing number of users per sequence, the MS code supports up to 82 users, each operating at a bit-rate of 622 Mbps with reference to the Bit Error Rate (BER) of 10−9.

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Development of Multi-Service (MS) for SAC-OCDMA systems
ABSTRACT
A Multi-Service Optical Code Division Multiple Access (MS-OCDMA) code based on
Spectral Amplitude Coding (SAC) is proposed in this paper. The advantage of proposed code
on setting a variable number of users in a basic code matrix with a fixed code weight makes it
more flexible in generating codewords. The appropriate quality of service required for
various network applications can be provided by choosing a different number of users for the
basic code matrix of MS code. The properties of the proposed code is compared with other
OCDMA codes in terms of code length and maximum cross-correlation. The performance of
the MS code mathematically analysed and probability of error for users is plotted as a
function of the number of active users and optical received power. Shot, phase induced
intensity and thermal noises are considered in mathematical analysis. Results show that by
choosing code weight of 4 and optimizing number of users per sequence, the MS code
supports up to 82 users, each operating at a bit-rate of 622 Mbps with reference to the Bit
Error Rate (BER) of 10−9.
Keyword:
Optical Code Division Multiple Access (OCDMA); Spectral Amplitude Coding
(SAC); Multiple Access Interference (MAI)
Citations
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Journal ArticleDOI

Generalized optical code construction for enhanced and Modified Double Weight like codes without mapping for SAC–OCDMA systems

Soma Kumawat, +1 more
- 01 Jul 2016 - 
TL;DR: A new generalized algorithm to construct EDW and MDW like codes without mapping for any weight greater than 2 is proposed and analysed for BER using balanced detection and direct detection techniques.
Journal ArticleDOI

Development of new two-dimensional spectral/spatial code based on dynamic cyclic shift code for OCDMA system

Nabiha Jellali, +3 more
- 01 Jul 2017 - 
TL;DR: By keeping the same code length and increasing the spatial code, the performance of the 2D-DCS system is enhanced: it provides higher data rates while using lower transmitted power and a smaller spectral width.
Journal ArticleDOI

Variable weight spectral amplitude coding for multiservice OCDMA networks

Saleh Seyedzadeh, +3 more
- 01 Sep 2017 - 
TL;DR: A new variable-weight code based on spectral amplitude coding for optical code-division multiple-access (OCDMA) networks to support QoS differentiation and it is shown that the proposed code provides an optimal code length with minimum cross-correlation value when compared to other codes.
Journal ArticleDOI

Performance Analysis of Diagonal Eigenvalue Unity (DEU) Code Using NAND Subtraction and Spectral Direct Detection Techniques and Its Use with Triple-Play-Services in SAC-OCDMA

Salwa Mostafa, +3 more
- 01 Dec 2015 - 
TL;DR: A comparison between the utilization of the NAND subtraction detection technique and the spectral direct detection (SDD) technique is presented to investigate which one provides better performance with the DEU code.
Journal ArticleDOI

Experimental demonstration of variable weight SAC-OCDMA system for QoS differentiation

Saleh Seyedzadeh, +4 more
- 01 Jul 2014 - 
TL;DR: Using mathematical approximation the capacity of VW-SAC-OCDMA system is demonstrated and results show that for back-to-back system minimum average power of −20 dBm per chip is required to maintain the acceptable performance.
References
More filters
Journal ArticleDOI

Introduction to Fourier Optics

Joseph W. Goodman, +1 more
- 01 Apr 1969 - 
TL;DR: The second edition of this respected text considerably expands the original and reflects the tremendous advances made in the discipline since 1968 as discussed by the authors, with a special emphasis on applications to diffraction, imaging, optical data processing, and holography.
Book

Introduction to Fourier optics

Joseph W. Goodman
TL;DR: The second edition of this respected text considerably expands the original and reflects the tremendous advances made in the discipline since 1968 as discussed by the authors, with a special emphasis on applications to diffraction, imaging, optical data processing, and holography.
Journal ArticleDOI

Optical orthogonal codes: design, analysis and applications

Fan Chung, +2 more
- 01 May 1989 - 
TL;DR: Methods for the design and analysis of OOCs, using tools from projective geometry, the greedy algorithm, iterative constructions, algebraic coding theory, block design, and various other combinational disciplines, are discussed.
Proceedings Article

Optical orthogonal codes: design, analysis, and applications

Fan Chung, +2 more
TL;DR: In this article, the authors derived upper and lower bounds on the maximum possible size of an optical orthogonal code (OOC) using tools from projective geometry, the greedy algorithm, iterative constructions, algebraic coding theory, block design, and various other combinational disciplines.
Journal ArticleDOI

Modified quadratic congruence codes for fiber Bragg-grating-based spectral-amplitude-coding optical CDMA systems

Zou Wei, +2 more
- 01 Sep 2001 - 
TL;DR: In this article, a series of new code families for the spectral-amplitude-coding optical code-division multiple access (CDMA) system, and proposed new transmitter and receiver structures based on tunable chirped fiber Bragg gratings (FBGs) were constructed.
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Frequently Asked Questions (1)
Q1. What are the contributions in this paper?

A Multi-Service Optical Code Division Multiple Access ( MS-OCDMA ) code based on Spectral Amplitude Coding ( SAC ) is proposed in this paper. The appropriate quality of service required for various network applications can be provided by choosing a different number of users for the basic code matrix of MS code.