Segment Protection for Bandwidth Efficiency and Differentiated Quality of Protection

We consider the problem of dynamic survivable lightpath provisioning against single node (crossconnect) and single link (fiber) failures. Specifically, we focus on shared protection (because of its desirable resource efficiency) with the assumptions that existing lightpaths cannot be disturbed and no knowledge of future arrivals is available at the time of provisioning the current lightpath request. While we consider full wavelength-convertible networks here, the extension to the wavelength-continuous case is straightforward.