Protocols to eliminate tuning penalties for packet-switched WDM star networks with large tuning latency

Jieh Chian Wu*, Alan E. Willner, John A. Silvester

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

3 Scopus citations

Abstract

The use of low-speed tunable devices may lead to throughput and delay penalties for packet-switched WDM star networks. When the tuning latency is significant, conventional cost-effective solutions result in significant throughput and delay penalties. Our approach: (i) combines and unifies existing approaches to improve performance by pipelining multiple tunable filters per node and making a TDM schedule with maximum time gap for reception; (ii) introduces 'superpackets' (multiple packets with the same source and destination), thereby relaxing the impact of large tuning latency. Since the superpackets increase throughput at the cost of increased delay, we determine the minimum delay, under a constraint of no throughput penalty. A discrete-time queueing model of the protocol shows that a system with two tunable filters per node has low delay and is wavelength-efficient for uniform traffic.

Original languageEnglish
Pages (from-to)15-31
Number of pages17
JournalJournal of High Speed Networks
Volume6
Issue number1
DOIs
StatePublished - 1997
Externally publishedYes

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