We study the configuration and dual-span failure performance of pre-configured protection cycles (p-cycles) in survivable WDM optical networks with partial wavelength conversion. We formulate the problem as an integer linear program using a non-joint optimization approach. p-cycles and wavelength converters are then optimally determined. The objective is to minimize the total cost of link capacity used by p-cycles and the cost of wavelength converters required to accommodate a set of traffic demands, and to select from the set of optimal cost solutions, the solution which has the best survivability performance against dual failures in terms of the average capacity loss, the average restorability, and the efficiency of the protection capacity. The proposed p-cycle configuration architecture takes full advantage of converter sharing, requiring as few converters as possible. Two different performance improvement cost functions are applied as dual-failure protection performance predictors. One is based on the number of unique p-cycles selected; the other is based on the maximum working capacity protected by any single selected p-cycle. Our numerical results indicate that the latter shows the best performance throughout the simulations. The performance of the methodology and the best prediction function depend on which of the performance metrics is considered to be the most important. The size of the network, the maximum allowable p-cycle length and the number of demands all influence this performance.

Date Published: 5 December 2005
PDF: 12 pages
Proc. SPIE 6022, Network Architectures, Management, and Applications III, 602229 (5 December 2005); doi: 10.1117/12.636011

Published in SPIE Proceedings Vol. 6022:
Network Architectures, Management, and Applications III
Kwok-wai Cheung; Gee-Kung Chang; Guangcheng Li; Ken-Ichi Sato, Editor(s)