Traffic grooming continues to be a rich area of research in the context of WDM optical networks. Past research studies that focused on improving network utilization required high speed optical cross-connects that could switch at the packet or burst level. Such optical technologies are expensive and hard to fabricate. Recently, there have been some research into designing new architectures focused on optical grooming without using fast optical switches. Such technologies are economical, scalable, use off-the-shelf components, yet, when interconnected in a novel way provide significant network...