• ring networks;
  • optical networks;
  • WDM;
  • wavelength assignment;
  • maximum profit;
  • approximation algorithms;
  • experimental evaluation


We are interested in the problem of satisfying a maximum-profit subset of undirected communication requests in an optical ring that uses the Wavelength Division Multiplexing technology. We present four deterministic and purely combinatorial algorithms for this problem, and give theoretical guarantees for their worst-case approximation ratios. Two of these algorithms are novel, whereas the rest are adaptation of earlier approaches. An experimental evaluation of the algorithms in terms of attained profit and execution time reveals that the theoretically best algorithm performs only marginally better than one of the new algorithms, while at the same time being several orders of magnitude slower. Furthermore, an extremely fast greedy heuristic with nonconstant approximation ratio performs reasonably well and may be favored over the other algorithms whenever it is crucial to minimize execution time. © 2011 Wiley Periodicals, Inc. NETWORKS, 2011