Elastic Optical Networks by Víctor López & Luis Velasco

Author:Víctor López & Luis Velasco
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

6.5.2 Need for Multidimensionality in Future Optical Nodes

Multidimensionality in optical networks refers to the different number of dimensions that can be supported by the network elements or nodes in a network for transmission, control and management of optical signals carrying information. Mainly, these dimensions in combination offer salient advantages to the optical networks since not only the network capacity is increased considerably but also optical networking system features are enhanced, allowing different network limitations to be overcome. However, advanced future optical nodes require certain system attributes to be able to cope with the dynamic network traffic and the expected new services demanded by the network users. In addition, it is important to provide a node architecture that is able to support a simple single-dimension single-function node evolvable and scalable to multiple ones where and when needed. To address this, the functional elements of the node should be decoupled from the input and output fibers. Thus, future network elements are expected to operate in combination with multiple dimensions, allowing a number of new benefits to the network.

Based on these node requirements, a node design paradigm has been presented in [37] and its architecture is shown in Fig. 6.20. This Architecture on Demand (AoD) node consists of an optical backplane, connected to several signal processing modules, such as SSS, fast switch, Erbium-Doped Fiber Amplifier (EDFA) , spectrum defragmenter, etc., and the node’s inputs and outputs. With this architecture, different arrangements of inputs, modules and outputs can be constructed by setting up appropriate cross-connections in the optical backplane. This AoD node observes a higher level of flexibility compared to Broadcast-and-Select (BS) and the Spectrum Routing (SR) architectures as the components used for optical processing are not hardwired like in a static architecture but can be interconnected together in an arbitrary manner.

Fig. 6.20 Architecture on Demand (AoD) node

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