OPTICAL WAVELENGTH MULTIPLEXER/DEMULTIPLEXER

摘要

An optical wavelength multiplexer/demultiplexer has an input channel waveguide, an input slab waveguide, an arrayed-waveguide grating having N channel waveguides, an output slab waveguide, and N output channel waveguides. Each output channel waveguide is provided with an outwardly tapered end. Each tapered end has a width at its end surface which becomes larger as the output channel waveguide becomes distant from the symmetrical axis of the output slab waveguide. The loss differences suffered by each separated signal may be substantially reduced.