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Journals and Conferences
We develop traffic grooming algorithms for unidirectional SONET/WDM ring networks. The objective is to assign calls to wavelengths in a way that minimizes the total cost of electronic equipment [e.g., the number of SONET add/drop multiplexers (ADM's)]. We show that the general traffic grooming problem is NP-complete. However, for some special cases we… (More)
The DARPA CORONET project seeks to develop the target network architectures and technologies needed to build next-generation long-distance IP-over-Optical-Layer (IP/OL) networks. These next-generation networks are expected to scale 10-100 times larger than today's largest commercial IP/OL network. Furthermore, DARPA has established advanced objectives for… (More)
The Core Optical Networks (CORONET) program addresses the development of architectures, protocols, and network control and management to support the future advanced requirements of both commercial and government networks, with a focus on highly dynamic and highly resilient multi-terabit core networks. CORONET encompasses a global network supporting a… (More)
The optical layer can provide for an Internet protocol (IP) client a rapid, efficient restoration after a link failure; however its inability to protect against router failure erodes its attractiveness. Here, we propose a joint IP/optical restoration mechanism addressing this problem.
After many years of research and industry efforts, ultra long haul (ULH) technologies for DWDM transport are maturing, and carriers are deploying such technology for high capacity and capital savings. Unlike opaque optical networks, how best to recover an all-optical ULH network after failure is still uncertain. This paper analyzes four recovery schemes in… (More)
The DARPA CORONET project envisions a next-generation dynamic IP/optical network. We present an optical-layer restoration methodology for CORONET based on an extension of AT&T's ROLEX method.
We use Monte Carlo simulations of quasi-static traffic growth to study concentration of regenerator sites in dynamic photonic networks supporting service velocity. Idle regenerators can be reduced by >60% compared to unrestricted regeneration sites.
Concentrating optical regenerators in a subset of nodes provides significant savings. We present a heuristic for choosing this subset. In the studied cases our results have 1 or 2 more sites than the minimum.
This paper deals with a new wavelength assignment problem encountered in state-of-art ULH networks. Simulation shows that simple and practical heuristics in deploying mux/demux structures can reduce the total cost significantly.
We describe the multi-layer GRIPhoN architecture which provides dynamic bandwidth at the OTN and wavelength layers for private-line customers. We propose and demonstrate an automated restoration approach for wavelength connections using dynamic re-provisioning.