OPTICAL MULTIPLEXER

摘要

An apparatus including an optical multiplexer that includes a plurality of stages to form associated parts of an optical path. The optical multiplexer combines optical signals associated with a plurality of wavelengths along the optical path to form a wavelength-division multiplexing (WDM) signal and a given stage of the plurality of stages diverts optical energy away from the optical path. The apparatus includes a photodetector to sense the diverted optical energy.