Patent ID: 8358891

Claim:
A waveguide type optical device comprising: a substrate; a first electrode formed on the substrate; a first cladding formed on the first electrode; a first core formed on the first cladding; a second core formed on the first core; a second cladding formed on the second core; a second electrode formed on the second cladding; and a side cladding layer which covers a side surface of a core layer composed of the first core and the second core, wherein a lateral width of one core from among the first core and the second core is satisfying a single mode condition for a waveguide, and a lateral width of the other remaining the first core or the second core is almost equal to or more than a width of a field distribution of light, whereas the other remaining the first core or the second core is not connected to a nearby core, and a region where the first electrode and the second electrode vertically overlap each other is positioned over a region where the first core and the second core vertically overlap each other.