Dr. Xiaowen Chu Profile

Dr. Xiaowen Chu

at Hong Kong Baptist Univ

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Publications (4)

Proceedings Article | 8 February 2005 Paper

Wavelength assignment in WDM networks with sparse-partial wavelength conversion

Xiaowen Chu, Bo Li

Proceedings Volume 5626, (2005) https://doi.org/10.1117/12.573422

KEYWORDS: Wavelength division multiplexing networks, Switches, Multiplexers, Computer programming, Computer simulations, Computer science, Lithium, Optical switching, Network architectures, Fiber optics

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Proceedings Article | 1 October 2003 Paper

Sparse-partial wavelength conversion in wavelength-routed all-optical networks

Xiaowen Chu, Bo Li, Zhensheng Zhang

Proceedings Volume 5285, (2003) https://doi.org/10.1117/12.533332

KEYWORDS: Network architectures, Radium, Wavelength division multiplexing networks, Optical networks, Computer science, Switches, Optical communications, Optical switching, Quantitative analysis, Dense wavelength division multiplexing

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Proceedings Article | 9 September 2002 Paper

Routing and wavelength assignment versus wavelength converters placement in all-optical networks

Bo Li, Xiaowen Chu, Kazem Sohraby, Michael Hatwick, Jeffrey Kang, Feng Li

Proceedings Volume 4910, (2002) https://doi.org/10.1117/12.482443

KEYWORDS: Radium, Computer simulations, Optical networks, Lithium, Data conversion, Circuit switching, Systems modeling, Optical communications, Electronics, Wavelength division multiplexing networks

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Proceedings Article | 3 July 2002 Paper

Wavelength converter placement for different RWA algorithms in wavelength-routed all-optical networks

Xiaowen Chu, Bo Li, Imrich Chlamtac

Proceedings Volume 4874, (2002) https://doi.org/10.1117/12.475296

KEYWORDS: Radium, Computer simulations, Algorithm development, Computer science, Lithium, Wavelength division multiplexing, Optical networks, Data modeling, Computer engineering, Optical communications

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Sparse wavelength conversion and appropriate routing and wavelength assignment (RWA) algorithms are the two key factors in improving the blocking performance in wavelength-routed all-optical networks. It has been shown that the optimal placement of a limited number of wavelength converters in an arbitrary mesh network is an NP complete problem. There have been various heuristic algorithms proposed in the literature, in which most of them assume that a static routing and random wavelength assignment RWA algorithm is employed. However, the existing work shows that fixed-alternate routing and dynamic routing RWA algorithms can achieve much better blocking performance. Our study in this paper further demonstrates that the wavelength converter placement and RWA algorithms are closely related in the sense that a well designed wavelength converter placement mechanism for a particular RWA algorithm might not work well with a different RWA algorithm. Therefore, the wavelength converter placement and the RWA have to be considered jointly. The objective of this paper is to investigate the wavelength converter placement problem under fixed-alternate routing algorithm and least-loaded routing algorithm. Under the fixed-alternate routing algorithm, we propose a heuristic algorithm called Minimum Blocking Probability First (MBPF) algorithm for wavelength converter placement. Under the least-loaded routing algorithm, we propose a heuristic converter placement algorithm called Weighted Maximum Segment Length (WMSL) algorithm. The objective of the converter placement algorithm is to minimize the overall blocking probability. Extensive simulation studies have been carried out over three typical mesh networks, including the 14-node NSFNET, 19-node EON and 38-node CTNET. We observe that the proposed algorithms not only outperform existing wavelength converter placement algorithms by a large margin, but they also can achieve almost the same performance comparing with full wavelength conversion under the same RWA algorithm.

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