Employing Code Domain for Contention Resolution in Optical Burst Switched Networks With Detailed Performance Analysis

• Published in: Journal of lightwave technology Vol. 27; no. 23; pp. 5284 - 5294
• Main Authors: Sowailem, M.Y.S., Morsy, M.H.S., Shalaby, H.M.H.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.12.2009; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Architecture; Bursting; Code Division Multiple Access; Code division multiplexing; Coding, codes; Dark current; Error analysis; Errors; Exact sciences and technology; Information, signal and communications theory; Interference cancellation; Multiaccess communication; Multiple access; Multiple access interference; Networks; optical communication; Optical fiber communications; Optical fiber networks; Optical noise; Optical receivers; Optical telecommunications; Performance analysis; Signal and communications theory; Studies; Switching and signalling; Switching theory; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Traffic flow; Transmission and modulation (techniques and equipments); Wavelength division multiplexing; Access control; Performance evaluation; System architecture; Code division multiplexing; Optical telecommunication; Wireless telecommunication; Error rate; Implementation; Optical fiber network; Coding; Optical switching; Dark current; Optical fiber communication; optical communication; Burst switching; Packet switched network; Multiple access; Packet switching; Receiver; All optical circuit; Signal interference; Burst error; Code division multiple access; Telecommunication network; Thermal noise; Shot noise
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2009.2031125

We propose the implementation of spectral-amplitude-coding optical code division multiple access (SAC-OCDMA) as a contention resolution technique in optical burst switched (OBS) networks. The new system architecture is presented in details where an all-optical methodology for cancelling multiple access interference is proposed. Performance evaluation of the proposed system in both MAC and optical layers is introduced where the overall burst error rate of the system is evaluated in three cases: full, partial, and no code conversion capabilities taking into account the receiver dark current, thermal, and shot noises at the egress nodes. Our results reveal that a considerable improvement in the performance of each core node in the system is achieved by using SAC-OCDMA instead of WDM in the optical layer underneath an OBS based MAC layer. We also conclude that a slight increase in the employed number of code converters enhances the overall system performance noticeably. Finally, optimum values for the number of codes, which lead to minimum overall burst error rate, are reached at different traffic conditions.