Patent ID: 7546007
Filing Date: 2009-06-09
Classification: G02B

Abstract:
1. An optical device comprising: a first waveguide having a first portion extending in a first direction, a second portion extending in a second direction different than the first direction, a third portion extending in the first direction, the second portion being provided between the first and third portions, and a fourth portion extending in a third direction different than the first and second directions; a second waveguide extending in the first direction; a buffer layer provided between the first and second waveguides, wherein a width of a portion of the second waveguide increases in the first direction, the portion of the second waveguide being spaced from the third portion of the first waveguide by the buffer layer, and the portion of the second waveguide overlapping the third portion of the first waveguide, such that an optical signal propagating in the first waveguide is transferred to the portion of the second waveguide.