Abstract
Feature Issue on
Next-Generation WDM Network Design and Routing (WDMN). The
increasing demand for bandwidth that has resulted from the emergence of various
bandwidth-thirsty applications has increased the need for employing WDM as a
dominant technology for the next-generation optical internet. As these networks
carry gigantic amounts of information, survivability has become a primary and basic
need for them. Although the available proactive protection schemes provide a 100%
restoration guarantee, they require huge redundancy and usually result in a very
high blocking probability. We propose a novel active restoration scheme that
restores a failed primary lightpath based on multiple predefined but nonreserved
backup paths along the primary path. Extensive simulation results based on three
typical test networks indicate that with a small increase in restoration time, our
new restoration scheme can reduce the blocking probability and the capacity
requirement significantly while guaranteeing a very high restoration
probability.
© 2004 Optical Society of America
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