Patent ID: 6934447

Claim:
A multi-stage optical power splitter having a plurality of Y-branched optical waveguides arranged in a tree hierarchy with at least one Y-branched optical waveguide at a leave of the tree, each of the Y-branched optical waveguides having a core section serving as a transmission medium of an optical signal and a cladding section surrounding the core section, at least one of the Y-branched optical waveguides located other than at a leave of the tree comprising: an input-tapered waveguide configured to receive the optical signal through a first ending section and to output the optical signal through a second ending section; and, a pair of first and second output-tapered waveguides each configured to receive the optical signal branched through the second ending section, from which said pair of first and second output-tapered waveguides are extending outwardly, said pair of first and second output-tapered waveguides having an asymmetrical structure with respect to a center line of said input-tapered waveguide, wherein the body of said first and second output-tapered waveguides are respectively formed in an arc whose curvature throughout remains convex with respect to the center line.