Multiple-access interference in 2-D wavelength/time optical CDMA system with optical hard-limiters

Jozef Chovan; František Uherek

doi:10.1117/12.638920

6 December 2006 Multiple-access interference in 2-D wavelength/time optical CDMA system with optical hard-limiters

Jozef Chovan, František Uherek

Proceedings Volume 5945, 14th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics; 59450M (2006) https://doi.org/10.1117/12.638920
Event: 14th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 2005, Nitra, Slovakia

Abstract

In this paper we present the proposed modification of 2-D wavelength/time (WIT) decoder¹ by placing the second optical hard-limiter (0-HL) after decoder's last optical coupler. The MA1 improvement of the 2-D W/T Optical Code Division Multiple Access (0-CDMA) system for the cases of 2D WIT decoder with one and with two 0-HLs is analyzed. Average value of signal-to-interference difference (SID) is used as the MA1 merit. The model of such 2D W/T 0-CDMA system for numerical calculation of the SID is proposed and presented in this paper. In the analyzed system, 2-D WIT Generalized Multiwavelength Prime Codewords (GMWPC), which are generated by algorithm reported in² are used for achieving multiple-access. We assume the implemented 0-HL proposed in ³. The properties of such 0-HL were approximated [4] and its two ideality parameters, which characterize the measure of its ideality, were defined. The input and output time optical pulses sequence of W/T 0-CDMA decoder is numerical simulated. Dependencies of SID versus the weight of codeword and the number of active users in the system are presented. The influence of the properties used 0-HLs is evaluated.

Citation Download Citation

Jozef Chovan and František Uherek "Multiple-access interference in 2-D wavelength/time optical CDMA system with optical hard-limiters", Proc. SPIE 5945, 14th Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics, 59450M (6 December 2006); https://doi.org/10.1117/12.638920

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KEYWORDS

Active optics

Computer programming

Code division multiplexing

Computer simulations

Receivers

Stars

Optical networks

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