Patent ID: 9239478
Filing Date: 2016-01-19
CPC Classification: G02B,G02F

Claim Text:
1. A ridge waveguide structure comprising: a substrate comprising a top surface; a ridge structure protruding from the top surface; and a waveguide formed in the ridge structure, a shape of the waveguide corresponding to a shape of the ridge structure; the ridge structure comprising a Y-shaped input section and a Y-shaped output section, the Y-shaped input section comprising a total input section, a first branch and a second branch, the first branch and the second branch diverging from the total input section and converging into the Y-shaped output section; the first branch comprising a first sub-Y-shaped section, the second branch comprising a second sub-Y-shaped section, the first sub-Y-shaped section comprising a first sub-branch and a second sub-branch, the second sub-Y-shaped section comprising a third sub-branch and a fourth sub-branch; the second sub-branch and the fourth sub-branch being positioned at two opposite sides of the combination of the first sub-branch and the third sub-branch; the third sub-branch extending in a straight line and being coupled to the first branch and the first output section; and the first sub-branch and the second sub-branch cooperatively defining a first recess therebetween, and the third sub-branch and the fourth sub-branch cooperatively defining a second recess therebetween.