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Proceedings Paper

On the impact of fiber-delay-lines (FDL) in an all-optical network (AON) bottleneck without wavelength conversion
Author(s): Pablo Jesus Argibay-Losada; Gokhan Sahin
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Paper Abstract

Random access memories (RAM) are fundamental in conventional electronic switches and routers to manage short-term congestion and to decrease data loss probabilities. Switches in all-optical networks (AONs), however, do not have access to optical RAM, and therefore are prone to much higher loss levels than their electronic counterparts. Fiber-delay-lines (FDLs), able to delay an optical data packet a fixed amount of time, have been proposed in the literature as a means to alleviate those high loss levels. However, they are extremely bulky to manage, so their usage introduces a trade-off between practicality and performance in the design and operation of the AON. In this paper we study the influence that FDLs have in the performance of flows crossing an all-optical switch that acts as their bottleneck. We show how extremely low numbers of FDLs (e.g., 1 or 2) can help in reducing losses by several orders of magnitude in several illustrative scenarios with high aggregation levels. Our results therefore suggest that FDLs can be a practical means of dealing with congestion in AONs in the absence of optical RAM buffers or of suitable data interchange protocols specifically designed for AONs.

Paper Details

Date Published: 22 August 2014
PDF: 7 pages
Proc. SPIE 9286, Second International Conference on Applications of Optics and Photonics, 92865I (22 August 2014); doi: 10.1117/12.2060558
Show Author Affiliations
Pablo Jesus Argibay-Losada, Univ. de Aveiro (Portugal)
Miami Univ. (United States)
Gokhan Sahin, Univ. de Aveiro (Portugal)

Published in SPIE Proceedings Vol. 9286:
Second International Conference on Applications of Optics and Photonics
Manuel Filipe P. C. Martins Costa; Rogério Nunes Nogueira, Editor(s)

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