A Wavelength and Converter Assignment Scheme using Converter Usage History in Wavelength-Routed Networks

Abstract

In wavelength-routed networks, wavelength conversion improves lightpath blocking probability by eliminating the wavelength-continuity constraint. Because wavelength converters remain expensive in the near future, we need a wavelength and converter assignment scheme that decreases blocking probability with a limited number of converters. In this paper, we propose a wavelength and converter assignment scheme for decreasing blocking probability. Our scheme avoids contention among multiple lightpath requests by making each node-pair to perform wavelength conversion at different intermediate nodes with more idle converters. Simulation results show that 1) our scheme decreases blocking probability by about between 44% and 83% and 2) our scheme needs one or two fewer wavelength converters per node to achieve near-optimal blocking probability compared with conventional schemes.

Wavelength Assignment Techniques with Converters for All Optical Networks (AONs)

“…A maximum of 5% wavelength converters are needed at any given moment under Minimum Converter Allocation (MCA) [17], which enhances the utilisation of wavelength converters. WC placement is on the auxiliary graph thanks to the link state data [3]. Depending on how they were used previously, intermediate node WCs are assigned.…”

“…Despite the fact that there have been numerous research on AON, it has proven challenging to design the optimum RWA method when WCs are present [3][4][5][6], which convert input signal wavelength to another available wavelength, reducing the blocking. AONs can be equipped with WCs at few node.…”

Placement of Wavelength Converters in Dynamically Routed All Optical Networks in presence of Tunable Transceivers

“…This architecture requires only 1% -5% of full WCs for varied traffic conditions. In [10], the auxiliary graph is created depending on the link state information of the route. The information is acquired from the history of number of converters utilized and idle converters from the intermediate nodes for the placement of wavelength converters.…”