Abstract

We investigate the effectiveness of link-protection schemes in terms of their ability to handle node failures in all-optical networks. We focus on node recovery, using a ring-based scheme (double-cycle cover; DCC) and generalized loopback. Comparisons are made by introduction of metrics that measure a protection scheme’s effectiveness in handling node failures. We also introduce measures that quantify failure impact, the degree to which a network is left vulnerable to a failure after a previous failure has been successfully recovered. Comparison with DCC for five sample networks shows that generalized loopback is more robust against node failures and can provide the same level of reliability while using 16% less capacity on average over five sample networks.

© Optical Society of America

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