We study the optical port saving under uniform waveband switching, and derive the network and traffic conditions that make waveband switching more efficient than wavelength switching. In particular, we study a combined waveband/wavelength switching scheme that allows wavelength circuits to share waveband circuits, and results in better waveband utilization. Using a model of a typical carrier core network, we demonstrate that waveband switching provides close to 25% port saving under an aggressive growth scenario.
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