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Optical Wavelength Division Multiplexing (WDM) rings are being deployed to support multiple SONET/SDH selfhealing rings over a single physical optical ring. In such systems, the dominating cost is the SONET Add/Drop Multiplexers (ADMs). To minimize the system cost, algorithms must be developed to assign wavelengths to lightpaths in the system so that the number of ADMs required is minimized. However, the problem of optimal wavelength assignment to minimize SONET ADMs is NP-hard. Existingdoi:10.1109/icppw.2001.951959 dblp:conf/icppw/YuanF01 fatcat:ybawjfzqjjd43en3b33xo4rusa