The aim of this work is the analysis of optical burst switching (OBS) networks with optical label processing based on optical code division multiplexing (OCDM) technology. An architecture of resource reservation based on just-in-time (JIT) was proposed and the blocking probability of burst loss considering the number of wavelength and traffic characteristics. Also, a cost model to compare the traditional electronic processing and optical processing was developed. The main results have showed the decrease of burst loss and economy of network resources when optical processing is utilized..

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This article evaluates the performance of Wavelength Division Multiplex (WDM) networks considering two different modes of photonic Switching: Optical Packet Switching (OPS) and Optical Circuit Switching (OCS). A resource distribution planning is proposed including wavelength/amplifier allocation to improve the blocking probability and to ensure signal quality. The present study considered the effects of signal attenuation and dispersion in mesh topology networks, and the actual utilization of each network link for the distribution of wavelengths and amplifiers. The physical network parameters considered had average diameter and average distance, as well as ASE noise accumulation and channel cross-talk. In order to evaluate and compare the performance between WDM-OCS and WDM-OPS, the following parameters were analyzed: delay (latency), blocking probability, and effective network-capacity utilization. Results show a reduction of blocking probability with a small increase in latency in both OCS and OPS, but the WDM-OPS combination presents results with very positive impact. Work was carried out with both analytic modeling and computer simulations.

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ResumoNeste trabalho é realizada uma análise de redes ópticas comutadas por rajadas que empregam processamento de rótulos compostos por códigos ópticos ortogonais (OOC) considerando as características de tráfego como comprimento/duração e taxa de chegada das rajadas. Os principais resultados mostram que a utilização do processamento de rótulos OOC atua na diminuição da probabilidade de perdas de rajadas, principalmente, para rajadas de pequena duração. Assim, pequenas rajadas que seriam bloqueadas nas redes com processamento eletrônico convencional são transmitidas quando se emprega o processamento de rótulos OOC. Dessa forma, ocorre um aumento de utilização da rede e uma diminuição na latência na transmissão das rajadas, alcançando uma granularidade próxima das redes de pacotes. Palavras-chave: Códigos ópticos ortogonais. Redes ópticas comutadas por rajadas. OCDM (Optical Code-Division Multiplexing). AbstractAn analysis is carried out with burst-switching optical networks which use label processing consisting of orthogonal optical codes (OOC), considering traffic characteristics such as length/duration and arrival rate of bursts. Main results show that the use of OOC label processing influences on the decrease of burst loss probability, especially for short-lived bursts. Therefore, short bursts that would be blocked in conventional electronic processing networks are transmitted when the OOC label processing is used. Thus, an increase in the network use occurs as well as a decrease in the burst transmission latency, reaching a granularity close to packets networks.