Synchronous flow control in wormhole routed optical networks

Chuan-Ching Sue, Sy Yen Kuo

Research output: Contribution to conferencePaperpeer-review


In this paper, we propose a synchronous flow control mechanism in wormhole routed optical networks. It is expected that the benefit of shorter routing delay and smaller buffer size requirement in wormhole routing will be significant in optical networks. Different from the traditional bi-directional asynchronous back-pressure flow control, the flow control is modified to be unidirectional and synchronous. The size of synchronized control slot does not depend on the routing path length and the number of bits is a constant which is equal to the total number of virtual channels and nodes. The proposed flow control takes advantage of the restricted order of accessing channels in deadlock-free routing to broadcast their control information in a corresponding restricted order. Furthermore, in order to reduce the buffer size to only one unit, the virtual channels which share the same physical channel must be able to simultaneously transmit data. The low channel utilization induced by such mechanism is overcome by our modified source routing. In summary, this paper introduces a flow control mechanism which easily incorporates the benefit of wormhole routing into the limited-resource optical networks.

Original languageEnglish
Number of pages8
Publication statusPublished - 1998 Dec 1
EventProceedings of the 1998 International Conference on Parallel and Distributed Systems, ICPADS - Tainan, China
Duration: 1998 Dec 141998 Dec 16


OtherProceedings of the 1998 International Conference on Parallel and Distributed Systems, ICPADS
CityTainan, China

All Science Journal Classification (ASJC) codes

  • Hardware and Architecture


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