Performance analysis of limited number of wavelength converters by share per node in optical switching network

Authors:
Hailong Li;Ian Li-Jin Thng
Affiliations:
National University of Singapore, Department of Electrical and Computer Engineering, 10 Kent Ridge Crescent, Singapore 119260, Singapore;National University of Singapore, Department of Electrical and Computer Engineering, 10 Kent Ridge Crescent, Singapore 119260, Singapore
Venue:
Computer Networks: The International Journal of Computer and Telecommunications Networking
Year:
2007

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Abstract

In this paper, we present studies of an optical switching (OS) node utilizing a limited number of WCs (wavelength converters) in order to reduce the implementation cost of an OS node. The study stems from practical observation that WCs are expensive. Consequently, each output wavelength may not necessarily have its own WC and has to share a limited pool of WCs with other output wavelengths. In order to improve the utilization of the limited number of WCs, a share per node (SPN) method is proposed for the OBS node. Subsequently, a multi-dimensional Markov chain model of SPN is presented to evaluate its performance. To reduce the complexity of the multi-dimension Markov analysis, we propose a suite of methods, called randomized states (RS) multi-plane Markov chain analysis, followed by self-constrained iteration (SCI) and eventually ending with the sliding window (SW) update method, to solve for the solution. Numerical results are presented to verify the accuracy of the analytical model. With SPN, about 50% and 80% of WCs can be saved in high load and low load scenarios respectively.