Patent attributes
A dual-band wavelength division multiplexer is disclosed. The multiplexer includes a first and a second slab waveguide, a plurality of channel waveguides connecting the first slab waveguide to the second slab waveguide, an input part connected to the first slab waveguide, and an output part connected to the second slab waveguide. The input part includes an input waveguide for receiving an optical signal from an exterior, and a wavelength division multiplexing filter connected to the input waveguide, for outputting an optical signal in a first band to a first connecting waveguide, and outputting an optical signal in a second band to a second connecting waveguide. The input part also includes a first mode converter connected to the wavelength division multiplexing filter through the first connecting waveguide, for mode-converting the inputted optical signal in the first band and a second mode converter connected to the wavelength division multiplexing filter through the second connecting waveguide, for mode-converting the inputted optical signal in the second band. An output mode of the first mode converter has a width different from that of an output mode of the second mode converter.
