Title :
A 10/7 + ε Approximation for Minimizing the Number of ADMs in SONET Rings
Author :
Shalom, Mordechai ; Zaks, Shmuel
Author_Institution :
Technion - Israel Inst. of Technol., Haifa
Abstract :
SONET add/drop multiplexers (ADMs) are dominant cost factors in WDM SONET rings. Whereas most previous papers on the topic concentrated on the number of wavelengths assigned to a given set of lightpaths, more recent papers argue that the number of ADMs is a more realistic cost measure. Some of these works discuss various heuristic algorithms for this problem, and the best known result is a 3/2 approximation in Calinescu and Wan, 2002. Through the study of the relation between this problem and the problem of finding maximum disjoint rings in a given set of lightpaths we manage to shed more light onto this problem and to develop a 10/7 + epsi approximation for it.
Keywords :
SONET; approximation theory; optical fibre networks; wavelength assignment; wavelength division multiplexing; ADM; WDM SONET rings; add/drop multiplexers; heuristic algorithms; Add-drop multiplexers; Bandwidth; Costs; Fiber lasers; Optical fiber cables; Optical fiber devices; Optical receivers; SONET; WDM networks; Wavelength division multiplexing; Add-drop multiplexer (ADM); optical networks; wavelength assignment; wavelength division multiplexing (WDM);
Journal_Title :
Networking, IEEE/ACM Transactions on
DOI :
10.1109/TNET.2007.906638
