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In this paper, a new shared protection mechanism for meshed optical networks is presented. Significant network design cost reductions can be achieved in comparison to the well-known 1+1 protection scheme. Demand-wise Shared Protection (DSP) bases on the diversification of demand routings and exploits the network connectivity to restrict the number of backup lightpaths needed to provide the desired level of protection. Computational experiments approve the benefits of the concept DSP for cost efficient optical network designs.

We assume Intelligent Optical Networks (ION) to be the next step on the transport network evolution path. ION is an acronym for an optical network provided with a control plane (distributed routing and signaling functions for dynamic connection configurations), such as GMPLS and ASON. IONs enable fast service provisioning and make efficient use of network capacity by dynamically allocating resources to services on demand. Furthermore, the distributed control functions allow flexible and cost eMicient resilience schemes in IONs. In the recent past, we have observed increasingly dynamic traffic and service conditions leading to frequent transport network recofligurations. In this paper, we compare the performance of different resilience mechanisms, namely dedicated path protection, shared path protection, shared link protection, pcycles, and restoration, protecting dynamic services.

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