Srivatsan Balasubramanian

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The Internet transport infrastructure is evolving toward a model of high-speed routers interconnected by intelligent optical networks. In this article we review current optical networking architectures and describe a new concept proposed in A. Gumaste and I. Chlamtac [2003]: light-trails. We develop light-trails as a novel and amenable control and(More)
We explore network design principles for next-generation all-optical wide-area networks, employing light-trail technology. Light-trail is a light-wave circuit that allows multiple nodes to share the optical bandwidth through the inclusion of simple but flexible hardware overlaid with a lightweight control protocol. We develop light-trails as a novel and(More)
The light-trail architecture provides a novel solution to address IP-centric issues at the optical layer. By incorporating drop and continue functionality, overlaid with a lightweight control protocol, light-trails enable efficient sharing of network resources, support subwavelength traffic and minimize costs. In this work, we investigate network design and(More)
Traffic grooming continues to be a rich area of research in WDM optical networks. In this paper, we identify four kinds of path level traffic aggregation/grooming strategies - point to point (P2P), point to multi-point (P2MP), multi-point to point (MP2P), and multi-point to multi-point (MP2MP). We develop an auxiliary graph based approach as a generic(More)
Telecommunication networks have rapidly added staggering amounts of capacity to their long haul networks at low costs per bit using DWDM technologies. Concurrently, there has been a wave of new access technologies that are driving customers to demand high-speed, robust and customized data services. These dynamics have led to what is called the "metro(More)
Traffic grooming continues to be a rich area of research in the context of WDM optical networks. We provide an overview of the optical and electronic grooming techniques available with focus on IP as the client layer. We discuss the various architectural alternatives available: peer, overlay and augmented models. We first provide a survey on the research(More)
We investigate the characteristics and performance of architectures that allow statistical sharing of wavelengths in the optical layer. The bandwidth of a light-wave circuit can be shared in the optical layer by multiple nodes that are along a linear path in a network through the inclusion of simple but flexible hardware overlaid with control software. We(More)
Recently, a new architecture called light-trails has been proposed that provides a novel control and management solution to address IP-centric issues at the optical layer. By inclusion of simple hardware that performs drop and continue functionality, overlaid with a light-weight control protocol, light-trails enable efficient sharing of network resources,(More)
This article provides an overview of some of the optical grooming (aggregation) techniques that have been developed recently with IP as the client layer. We identify four kinds of aggregation strategies: point to point (P2P), point to multipoint (P2MP), multipoint to point (MP2P), and multipoint to multipoint (MP2MP). Using an auxiliary graph-based model,(More)
Recent research has focused on designing new architectures and protocols for pure optical grooming without resorting to fast optical switching. This is achieved in three steps: (1) the circuit is configured in the form of a path or a tree (2) optical devices like couplers/splitters are used to allow a wavelength to aggregate traffic from multiple(More)