Journal ArticleDOI
Multiclass, Multistage, and Multilevel Fiber-Optic CDMA Signaling Techniques Based on Advanced Binary Optical Logic Gate Elements
B.M. Ghaffari,Jawad A. Salehi +1 more
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TLDR
It is shown that under the ideal case the increase in throughput resulting from the proposed multilevel FO-CDMA system is proportional to the number of classes or power levels in use, and a closed-form relation for the upper bound on the probability of error is obtained.Abstract:
In this paper we introduce and propose novel signaling methods and receiver structures based on advanced binary optical logic gates for fiber-optic code division multiple access (FO-CDMA) systems using all-optical signal processing. In the proposed system the users of the network are categorized into multiple classes. Users of each class transmit at the same power level but different from the levels of the other classes' users. Using a combination of optical OR, AND and XNOR logic gates for the receiver structure we show that such a network not only takes the full advantages of all-optical signal processing but also demonstrates a considerable throughput efficiency when compared to ordinary FO-CDMA systems. The proposed receiver structure mitigates the effect of interfering users from the other classes by rejecting some specified power level combinations from the other classes. The depth of interference cancellation is a function of the corresponding number of power levels and the number of stages applied to the optical logic gates in use. In our analysis we choose the generalized form of optical orthogonal codes (OOC), i.e., OOCs with cross-correlation value greater than one, as the signature sequence. We begin by emphasizing on two-level systems, that is, when the users can select one out of two power levels for signal transmission. However, for multilevel FO-CDMA we obtain a closed-form relation for the upper bound on the probability of error.We will show that under the ideal case the increase in throughput resulting from the proposed multilevel system is proportional to the number of classes or power levels in use. Our analytical results are compared to the results of an extensive system simulation. The numerical closeness between, the analytical and system simulation, indicates the accuracy with which we have modeled mathematically our proposed signaling using advanced binary optical logic gates in FO-CDMA.read more
Citations
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Journal ArticleDOI
Proposal for ultrafast all-optical XNOR gate using single quantum-dot semiconductor optical amplifier-based Mach–Zehnder interferometer
TL;DR: In this article, the feasibility of realizing an all-optical XNOR gate for 160Gb/s return-to-zero data pulses by using for the first time a single quantum-dot semiconductor optical amplifier (QD-SOA)-based Mach-Zehnder interferometer (MZI) is theoretically investigated and demonstrated.
Journal ArticleDOI
Analysis and Design of Adaptive OCDMA Passive Optical Networks
TL;DR: An adaptive OCDMA passive optical networks (OCDMA-PON) that adaptively shares unused resources of inactive users among active ones to improve upstream system performance is proposed and an approximated BER expression and defined design problems are presented.
Journal ArticleDOI
Multirate, Differentiated-QoS, and Multilevel Fiber-Optic CDMA System via Optical Logic Gate Elements
TL;DR: It is shown that using multilevel signaling technique in such a system results to the performance improvement, and the numerical closeness between the analytical and system simulation reveals the tightness of the obtained upper bound, hence making them quite useful in evaluating the above system's performance.
Journal ArticleDOI
All-Optical Multiservice Path Switching in Optical Code Switched GMPLS Core Networks
TL;DR: A novel labeling scheme based on optical code division multiplexing scheme in GMPLS network using multilength variable-weight optical orthogonal codes (MLVW-OOC) as signature sequences is presented and the numerical results reveal that users with high-weight codeword acquire better performance.
Journal ArticleDOI
Wireless optical CDMA LAN: digital implementation analysis
TL;DR: Results on the design and implementation of such systems in this paper indicate the viability and the importance of OOC based wireless OCDMA technology to satisfy certain applications need in a wider communication system worldwide.
References
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Journal ArticleDOI
Code division multiple-access techniques in optical fiber networks. I. Fundamental principles
TL;DR: An examination is made of fiber-optic code-division multiple-access (FO-CDMA), a technique in which low information data rates are mapped into very-high-rate address codes (signature sequences) for the purpose of achieving random, asynchronous communications free of network control, among many users.
Journal ArticleDOI
Code division multiple-access techniques in optical fiber networks. II. Systems performance analysis
J.A. Salehi,C.A. Brackett +1 more
TL;DR: In Part I a technique based on optical orthogonal codes was presented to establish a fiber-optic code-division multiple-access (FO-CDMA) communications system and it was shown that using an optical hard-limiter would, in general, improve system performance.
Journal ArticleDOI
Digital optical computing
A.A. Sawchuk,T.C. Strand +1 more
TL;DR: The paper begins with a review of analog, discrete, and binary methods of representing information in a computer, followed by a survey of many techniques for implementing binary combinatorial and sequential logic functions with individual optical devices and arrays of devices.
Journal ArticleDOI
Chip-level detection in optical code division multiple access
TL;DR: In this paper, a new detector called the chip-level receiver was proposed for ON-OFF keying (OOK) and pulse-position modulation (PPM) schemes, that utilize this receiver, and an exact bit error rate was evaluated taking into account the effect of both multiple-user interference and receiver shot noise.
Journal ArticleDOI
All-optical analog-to-digital converters, hardlimiters, and logic gates
L. Brzozowski,E.H. Sargent +1 more
TL;DR: The authors propose and analyze the optical signal processing functionality of periodic structures consisting of alternating layers of materials possessing different Kerr nonlinearities and propose a family of optical limiters whose output signal clamps to a set upper logic level for any input value exceeding a chosen threshold.
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