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Contention avoidance and resolution schemes in bufferless all-optical packet-switched networks: a survey

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2 Author(s)
Rahbar, A.G.P. ; Sahand University of Technology, Sahand New Town, Tabriz, Iran ; Yang, O.W.W.

Optical Packet Switching (OPS) is the promising switching technique to utilize the huge bandwidth offered by all-optical networks using the DWDM (Dense Wavelength Division Multiplexing) technology. However, optical packet contention is the major problem in an OPS network. Resolution and avoidance are two schemes to deal with the contention problem. A resolution scheme resolves collisions, while an avoidance scheme tries to reduce the number of potential collision events. Many OPS architectures rely on optical buffers to resolve contention. Unfortunately, optical buffering technology is still immature as it relies on bulky optical fiber delay lines. Furthermore, it requires a complex control. Therefore, a bufferless OPS network could still be the most straightforward implementation in the near future. In this article, we survey the contention resolution and avoidance schemes proposed for bufferless OPS networks. We also review the resolution and avoidance schemes that can handle the Quality of Service (QoS) issue in a QoS-capable bufferless OPS network.

Published in:

Communications Surveys & Tutorials, IEEE  (Volume:10 ,  Issue: 4 )

Date of Publication:

Fourth Quarter 2008

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