Patent ID: 6049644
Filing Date: 2000-04-11
Classification: G02B

Abstract:
An optical apparatus having a specifiable passband width comprising:a first free space region having at least one input port configured to receive light waves traveling through a first waveguide having an aperture configured to be coupled to said input port, said first waveguide further comprising a longitudinal slot extending inwardly within an end portion of said first waveguide from said aperture, said longitudinal slot having a given length, L, and width, S, so as to produce said specifiable passband width;an optical grating comprising a plurality of waveguides connected to said first free space region, said optical grating defined by a plurality of unequal length waveguides; anda second free space region coupled to said optical grating so as to receive light traveling through said optical grating, said second free space region further having at least one output port configured to provide light waves to a second waveguide coupled to said output port.