Patent ID: 9151898
Filing Date: 2015-10-06
Classification: G02B

Abstract:
1. An optical device, comprising an optical waveguide having a core and a cladding, the optical waveguide including a wide optical waveguide, an input optical waveguide connected with a first side of the wide optical waveguide, and four output optical waveguides connected with a second side of the wide optical waveguide, wherein the wide optical waveguide is configured to propagate an optical signal in an optical direction of propagation, the wide optical waveguide being of a planar shape, which is in line symmetry with respect to a core axis parallel to the optical direction of propagation; the first and second sides of the wide optical waveguide are opposite to each other and are substantially perpendicular to the core axis; the input optical waveguide is formed on the core axis, and the four output optical waveguides are disposed in symmetry with respect to the core axis, optical axes of the output optical waveguides being parallel to the core axis; measured orthogonally to the core axis, a center interval S between optical axes of any adjacent two of the output optical waveguides is of a same length, and a width of the wide optical waveguide is equal to four times of the center interval S; the four output optical waveguides include two inner optical waveguides located on opposite sides of the core axis and two outer optical waveguides located on opposite sides of the two inner optical waveguides, the two inner optical waveguides being closer to the core axis than the two outer optical waveguides; designating I the center interval S meets one of conditions 1 and 2, wherein