Patent ID: 6701045
Filing Date: 2004-03-02
Classification: G02B

Abstract:
A planar optical waveguide DWDM (Dense Wavelength Division Multiplexer) to perform wavelength division on a linearly polarized wade-band beam with a plurality of different wavelengths, which comprises the following optical devices formed on a planar optical path through the middle layer of a planar optical waveguide device using semiconductor manufacturing technologies:an input port, which guides the wade-band beam into the DWDM to travel along a first optical path; a curved grating, which is at the end of the first optical path to converge the input beam at a bright spot array and to generate color dispersion so that beams of different wavelengths are diffracted to different directions to travel along second optical paths symmetric about a line; and an arrayed waveguide, which has a plurality of beam input ports, a plurality of beam output ports connected to the plurality of beam input ports, and a plurality of optical fibers connected to the plurality of beam output ports, the plurality of beam input ports being at the end of the second optical paths in alignment with the diffractive beams from the curved grating to guide each of the diffractive beams to the corresponding beam output port and the corresponding optical fiber for output; further comprising a plane grating wherein the surface relief pattern is inscribed on the surface opposite to the curved grating in the middle layer of planar optical path and the plane grating is inserted between the curved grating and the arrayed waveguide to perform further wavelength division on the diffractive beams from the curved grating so as to increase the distance between adjacent beams.