On the impact of fiber-delay-lines (FDL) in an all-optical network (AON) bottleneck without wavelength conversion

Pablo Jesus Argibay-Losada; Gokhan Sahin

doi:10.1117/12.2060558

22 August 2014 On the impact of fiber-delay-lines (FDL) in an all-optical network (AON) bottleneck without wavelength conversion

Pablo Jesus Argibay-Losada, Gokhan Sahin

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Proceedings Volume 9286, Second International Conference on Applications of Optics and Photonics; 92865I (2014) https://doi.org/10.1117/12.2060558
Event: Second International Conference on Applications of Optics and Photonics, 2014, Aveiro, Portugal

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.

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Pablo Jesus Argibay-Losada and Gokhan Sahin "On the impact of fiber-delay-lines (FDL) in an all-optical network (AON) bottleneck without wavelength conversion", Proc. SPIE 9286, Second International Conference on Applications of Optics and Photonics, 92865I (22 August 2014); https://doi.org/10.1117/12.2060558

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KEYWORDS

Switches

Data modeling

Optical switching

Packet switching

Coarse wavelength division multiplexing

Data conversion

Interfaces

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