Abstract
We consider optical networks that use path restoration to restore lightpaths
in the event of link failures. We present capacity-assignment algorithms and
signaling protocols for various design options and evaluate their performance in
terms of capacity efficiency, restoration speed, and proportion of connections that
can be restored successfully. Results show that, with preplanning, methods that
share restoration capacity can provide rapid restoration while providing significant
capacity savings (as much as 40%) over methods with dedicated capacity. Methods with
failure-dependent (FD) restoration paths and wavelengths provide significant
capacity savings over methods with failure-independent (FI) paths and wavelengths.
However, this comes at a cost of considerably higher restoration time as well as an
increased fault-monitoring requirement. The wavelength-continuity requirement favors
methods with preplanning over methods with dynamic wavelength assignment (DWA) after
the failure. Increasing capacity does not compensate for lack of preplanning, which
makes DWA appropriate only as a secondary restoration mechanism (e.g., best effort).
Overall, preplanned FI restoration offers a good compromise between capacity
efficiency, failure recovery time, and implementation complexity.
© 2002 Optical Society of America
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