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Dynamic photonic networks rely on colorless, non-directional Reconfigurable Optical Add/Drop Multiplexer (ROADM) nodes to enable rapid re-routing of wavelength channels without optoelectronic conversion. We report numerical simulations of the wavelength contention that can occur in such multi-degree ROADM nodes. Intra-node blocking rates and transponder… (More)
We show that blocking in dynamic networks of colorless, non-directional ROADMs is tolerant to intra-node contention when contention-aware routing/wavelength assignment (RWA) algorithms are used. An optional client-side cross-connect enables low blocking with simpler RWA variants.
In this paper, we address the problem of traffic grooming and regenerator placement in a WDM optical network in which lightpaths are hop-constrained by physical impairments. The efficient placement of regenerators and electronic grooming equipment at ROADM nodes for a given network topology is required such that all traffic demands can be supported with… (More)
We show that the ideal spectrum granularity in dynamic flexible grid networks to achieve best blocking performance is determined by the greatest common factor of spectrum widths of all mixed-rate signals.
A dynamic and flexible network node architecture using modulation-flexible universal transceivers is proposed for beyond 100G transport and in-service network optimization. By sharing universal transceivers through a crossconnect switch, 20% reduction of universal transceivers is realized under dynamic traffic condition.
The advent of reconfigurable optical add/drop multiplexers with colorless and non-directional add/drop ports enables transponders and regenerators to be pre-deployed, without a priori knowledge of which wavelength or direction they will eventually serve. We study pre-deployment of optical regenerators as a means to drastically reduce the provisioning time,… (More)
In this paper we address the problem of constrained optimization (ILP formulation) and propose a set of heuristic algorithms for assigning light-trails [1–4,7,10] to WDM ring networks to facilitate IP centric dynamic communication at the optical layer. A light-trail is a generalization of a lightpath such that multiple nodes can take part in communication… (More)
We present a new concept “utilization entropy” which represents the level of resource fragmentation in optical networks. The utilization entropies of a link, a path and a network serve as useful indicators for network optimization.
Using numerical simulation of a dynamic network, we quantify the intra-node blocking occurring in colorless, non-directional Reconfigurable Optical Add/Drop Multiplexers (ROADMs). Designs including a client-side fiber cross connect are shown to offer lower blocking probability.
We jointly consider problems of virtual network mapping and routing and wavelength assignment in WDM networks. Flexible virtual node mapping enabled by network virtualization achieves significant optical network resource savings compared to fixed node mapping.