WAVELENGTH SELECTABLE OPTICAL ADD-DROP MULTIPLEXER

摘要

In a optical add-drop multiplexer, a tunable wavelength selection module selectively separates a channel or several channels from wavelength division multiplexed (WDM) channels received by the multiplexer. While the separated channel or channels are dropped by the multiplexer, the remaining channels are passed through the multiplexer and coupled to a fiber. Before the pass-through channels are coupled to the fiber, they are transmitted to a wavelength conversion module where they are multiplexed with a locally added channel that has been converted to a wavelength not present among the pass-through channels. For added flexibility, the specific wavelength of the converted channel may be varied by tuning the wavelength conversion module.