Flexible network design for multi-granular and quasi-dynamic traffic is important to minimize resource requirements. In the wavelength layer, wavelength blocking must also be reduced to achieve further cost reduction. We propose a novel traffic accommodation scheme based on repetitive Greenfield Re-grooming with Wavelength Defragmentation (GRWD), which is similar to storage-disk defragmentation. Numerical evaluation shows the required minimum number of sets of transport equipment for the proposed scheme.
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