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: Recent advances in optical communications not only increase the capacities of communication system but also improve the system dynamicity and survivability. Various new technologies are invented to increase the bandwidth of individual wavelength channels and the number of wavelengths transmitted per fiber. Multiple access technologies have also been developed to support various emerging applications, including real-time, on-demand and high data-rate applications, in a flexible, cost effective and energy efficient manner. In this paper, we overview recent research in optical communications and focus on the topics of modulation, switching, add-drop multiplexer, coding schemes, detection schemes, orthogonal frequency-division multiplexing, system analysis, cross-layer design, control and management, free space optics, and optics in data center networks. The primary purpose of this paper is to refresh the knowledge and broaden the understanding of advances in optical communications, and to encourage further research in this area and the deployment of new technologies in production networks.Computers & Electrical Engineering 01/2013; · 0.99 Impact Factor
Conference Paper: Design and simulation of a ROADM-based DWDM network[Show abstract] [Hide abstract]
ABSTRACT: Reconfigurable Optical Add/Drop Multiplexers, ROADMs, are key enablers of the modern optical communication services to support the remote provisioning of the optical paths and reconfiguring the network topology. According to the variety of the characteristics and architectures of ROADMs, there are some tradeoffs for ROADM-based DWDM network designers. In this paper different architectures and characteristics of ROADMs are addressed. Three ROADM architectures are proposed and finally, a five-node DWDM network based on the proposed ROADM architectures is designed in order to investigate two major issues of these kinds of networks. One of these issues is the effect of adding/dropping of channels on the passed through channels quality. The other issue is the effect of optical amplifiers input power fluctuation on the quality of received signals. The former is shown through simulation and the latter is investigated through measurement. The simulation and measurement results show that in ROADM-based DWDM networks, the wavelengths must be managed precisely to avoid the network performance degradation.Electrical Engineering (ICEE), 2013 21st Iranian Conference on; 01/2013
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ABSTRACT: Elastic optical networks are envisaged as promising solutions to fulfill the diverse bandwidth re-quirements for the emerging heterogeneous network applications. To support flexible allocation of spectrum re-sources the optical network nodes need to be agile. Among the different proposed solutions for elastic nodes, the one based on architecture of demand (AoD) exhibits consider-able flexibility against the other alternatives. The node modules in the case of AoD are not hard-wired, but can be connected/disconnected to any input/output port accord-ing to the requirements. Thus, each AoD node and the net-work (fabricated with AoD nodes) as a whole acts like an optical field-programmable gate array. This flexibility in-herent in AoD can be exploited for different purposes, such as for cost-efficient and energy-efficient design of the networks. This study looks into the cost-efficient network planning issue for synthetic networks implemented through AoD nodes. The problem is formalized as an inte-ger linear programming formulation for presenting the optimal solution. Furthermore, a scalable and effective heuristic algorithm is proposed for cost-efficient design, and its performance is compared with the optimal solution. The designed networks with AoD nodes are further inves-tigated for a dynamic scenario, and their blocking probabil-ity due to limited switching resources in the nodes is examined. To alleviate the blocking performance for the dy-namic case, an efficient synthesis strategy along with a scheme for optimal placement of switching resources within the network nodes is presented. Extensive results show that 1) even at high loads, the network with AoD nodes achieves saving of switching modules up to 40% com-pared to the one with static reconfigurable optical add– drop multiplexers (ROADMs) through a proper network design, 2) by diminishing the spectrum selective switches the overall power consumption of the network decreases by more than 25% for high loads, and 3) for the dynamic sce-nario the blocking owing to the node modules constraint is alleviated significantly by slightly augmenting the switch-ing devices and optimally deploying them within the network nodes.Journal of Optical Communications and Networking 07/2014; 6(7):635. · 1.43 Impact Factor