Colorless, Directionless and Contentionless multi-degree ROADM architecture for mesh optical networks
ABSTRACT A Colorless and Directionless (C&D) ROADM architecture has empowered today's networks with the much needed flexibility and scalability to handle the unpredictable high bandwidth demands, provide any-to-any connectivity and provision new services without disrupting the existing ones. In this paper, we realize the C&D ROADM architectures using PXC and WSS at a multi-degree node. We then evaluate both the architectures based on the various advantages offered by them. We also discuss some of the drawbacks of the two architectures. Subsequently, we propose a Colorless, Directionless and Contentionless (CD&C) architecture which combines the features offered by both the C&D architectures. Finally, we discuss practical implementation issues of the proposed architecture.
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ABSTRACT: Free-space micromachined optical-switching technology has emerged as a promising candidate for the large-scale optical cross connects that are needed in next-generation optical-transport networks. Although this technology has demonstrated good optical performance, its ability to expand to the required port-count while remaining within reasonable optical loss budgets has yet to be demonstrated. In this paper, we theoretically analyze the expandability of free-space micromachined optical switches. The chief loss mechanisms-Gaussian-beam divergence and angular misalignment-are analyzed both theoretically and experimentally. We find that micromirror angular repeatability in such a cross connect must be accurate within about 0.1°, and show that integrated mechanical structures are capable of achieving this goal. These results in general suggest that free-space micromachined optical-switching technology appears capable of achieving the port-count required by core-transport networks while remaining within cross-office optical-loss budgetsJournal of Lightwave Technology 05/2000; 18(4):482-489. · 2.56 Impact Factor
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ABSTRACT: We describe and demonstrate a modular microelectromechanical systems (MEMS)-based optical cross-connect (OXC) architecture. The OXC port count increases modularly by adding new optical modules, and a maximum cross-connectivity of /spl sim/ 350 /spl times/ 350 can be achieved in the current design. Each optical module has 16 ports with closed-loop servo-controlled MEMS mirrors. Using a prototype OXC system, mounted in a standard telecommunications equipment bay comprising optical modules, folding mirrors, and other optical elements, we demonstrate switching times of less than 10 ms, excellent optical power stability of less than /spl plusmn/ 0.15-dB variation, and immunity to stochastic vibrations. An automatic power peak-up process is performed when the power falls below 0.5-dB off the maximum coupled power for any connection.IEEE Photonics Technology Letters 01/2004; · 2.04 Impact Factor
Conference Proceeding: Multi-Degree ROADM's with Agile Add-Drop Access[show abstract] [hide abstract]
ABSTRACT: The rapid planning and deployment of reconfigurable all-optical carrier networks requires next-generation ROADM's that can support unlimited add-drop access with very high flexibility. We review a cost-effective multi-degree ROADM that can support up to 100% add-drop traffic capacity with unparalleled agility and minimal pre-planning. The ability of this ROADM to share, distribute and therefore minimize the need for local resources such as regeneration, wavelength-conversion, broadcast, and multicast cards, to the lowest possible required, is discussed for overall network level savings.Photonics in Switching, 2007; 09/2007