Patent ID: 7457498
Filing Date: 2008-11-25
Classification: G02B

Abstract:
1. An optical waveguide structure having a single port on one input/output side and a plurality of ports on another input/output side comprising: an S-bent optical waveguide portion arranged on the outermost side of the waveguide structure; tangential lines at opposed ends of the S-bent waveguide portion being parallel to each other; the S-bent optical waveguide portion including a first circular arc optical waveguide portion and a second circular arc optical waveguide portion connected thereto at a first inflection point where a curvature of the S-bent optical waveguide portion is inverted; the first circular arc optical waveguide portion having a first splitting/coupling point located on a single-port side relative to the first inflection point; and a third circular arc optical waveguide portion extending from the first splitting/coupling point toward the plural-ports side and having a curvature inverted relative to the first circular arc optical waveguide portion; wherein, at the first splitting/coupling point, a tangential line of the first circular arc optical waveguide portion and a tangential line of the third circular arc optical waveguide portion are parallel to and spaced from each other, and wherein the curvatures of the first, second and third circular arc optical waveguide portions are identical to the other.