Patent ID: 8086105
Filing Date: 2011-12-27
Classification: G02B

Abstract:
1. A wavelength division multiplexer/demultiplexer having a flat wavelength response, comprising: an Arrayed Waveguide Grating (AWG) comprising a plurality of arrayed waveguides having a specific optical path difference between a first slab waveguide coupled to an input waveguide and a second slab waveguide coupled to an output waveguide; and a modified taper-shaped optical waveguide interposed between the input waveguide and the first slab waveguide such that an optical signal input from the first slab waveguide to the AWG has a sinc-function distribution; wherein the modified taper-shaped optical waveguide comprises: a first waveguide section coupled to the input waveguide and having a taper shape whose width increases from a width of the input waveguide according to a length of the first waveguide section; a second waveguide section coupled to the first waveguide section and having a straight shape having the same width as an end of the first waveguide section; and a phase-change leading section being formed by removing the modified taper-shaped optical waveguide by a specific length and a specific width to cause a change in phase distribution of a guided mode in the second waveguide section.