Optimal Waveband Switching in Optical Ring Networks

Abstract

Waveband switching saves port costs in optical crossconnects by grouping together a set of consecutive wavelengths and switching them as a single waveband. Previous work has focused on either uniform band sizes or non-uniform band sizes considering a single node. In this paper, we show that such solutions are inadequate when considering the entire network, and present a novel framework for optimizing the number of wavebands in a ring network for deterministic traffic. We then consider a specific type of traffic, namely, all-to-all traffic and present bounds and heuristic solutions for the problem. Our results show that the number of ports can be reduced by a large amount using waveband switching compared to wavelength switching. We also numerically evaluate the performance of our waveband design algorithms under dynamic stochastic traffic.

Uniform waveband assignment in optical mesh networks

“…Specifically, in [13], solutions for both uniform and non-uniform waveband switching are presented whereas [11] only considers non-uniform wavebands. In [12], the waveband design problem is considered in the context of optical ring networks for non-uniform wavebands. To the best of our knowledge, this is the first work on waveband design for optical mesh networks.…”

“…In [11][12][13], the authors showed the benefits of using non-uniform wavebands. Izmailov et al [11] investigated the case of nonuniform wavebands at a single node, which is the source of lightpaths to multiple destinations, and also discussed non-uniform wavebands in terms of waveband utilization.…”

“…Although non-uniform wavebanding yields an improvement in band utilization, it adds to system complexity by requiring several intermediate filters. Turkcu and Subramaniam [12] introduce a method to optimally calculate non-uniform wavebands with a minimum switching cost in ring networks. Chen et al [13] considered the case of a single switching node with multiple inputs/outputs.…”

“…{IsOverlappingw 10 thenAssign the wavelength to connection 11 r z , i.e., C w,rz = 1; Make wavelength w occupied on every12 link of route r z ; FormBandsonRoute(w,r z ); Pseudocode of the heuristic algorithm for mesh networks.…”

Wavelength Retuning in Optical Waveband Switching Networks

“…With the worldwide fiber deployment and advancing dense WDM technologies, one of the major challenges faced by T-OXCs is the dramatic increase of the node size, cost and control complexity. To address such issues, waveband switching (WBS) in conjunction with multi-granular optical cross-connects (MG-OXCs) is introduced [2]- [12]. One fundamental problem in WBS networks is the routing and wavelength/waveband assignment (RWA), which refers to the process of assigning wavelengths and routing wavelengths through intermediate nodes to satisfy the traffic demands.…”