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In this paper, we consider a uni-directional ring network with limited reconfigurability and take up the problem of supporting all-to-all traffic -while minimizing the worstcase wavelength range of the reconfigurable optical add drop multiplexers (ROADMs). ROADMs can be limited in range (LROADMs) or have full range (F-ROADMs). The cost of such a network is dominated by the number of wavelengths to be added or dropped by ROADMs. Limiting the range of wavelengths that can be accessed at a node reduces costs. Here, we develop an integer linear programming (ILP) formulation for this problem, and also propose a new wavelength assignment heuristic where we evalute it using the ILP formulation. We conclude that the performance of our proposed heuristic is very close to optimal and the worst-case range is only about 65% of the full range for moderately large number of network nodes.

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