Patent ID: 6526202
Filing Date: 2003-02-25
Classification: G02B

Abstract:
A phasar comprising:an input waveguide; an input slab coupled to the input waveguide; a waveguide grating, the waveguide grating having a plane of symmetry, the waveguide grating including a first waveguide having a length and initial directional angle, the first waveguide including an arcuate portion having an arc length, a first end and a second end, the first end of the arcuate portion being coupled to the slab, a plurality of adjacent waveguides, each waveguide having a length and an initial directional angle, each waveguide including a first arcuate portion having an arc length, a first end and a second end, the first arcuate portion of each of the plurality of waveguides curving in the same direction as the arcuate portion of the first waveguide, the first end of the first arcuate portion being coupled to the input slab, a second arcuate portion having a first end and a second end, the second arcuate portion curving opposite the first arcuate portion, the first end of the second arcuate portion being coupled directly to the second end of the first arcuate portion with essentially no straight waveguide portion therebetween; a first straight portion having a length, a first end and a second end, the first end of the first straight portion being coupled to the second end of the second arcuate portion, the second end of the first straight portion lying substantially along the plane of symmetry, wherein the waveguides of the waveguide grating have incrementally increasing lengths, with the first waveguide of the waveguide grating having the shortest length.