US Patent 7158702 Optical junction apparatus and methods employing optical power transverse-transfer

Discrete first and second optical transmission subunits are formed each having a corresponding transmission optical waveguide with a corresponding optical junction region. The first transmission optical waveguide is a planar optical waveguide formed on a substrate. The first transmission optical waveguide or the second transmission optical waveguide is adapted for enabling substantially adiabatic transverse-transfer of optical power between the optical waveguides at the respective optical junction regions. The first and second optical transmission subunits are assembled together to form an optical apparatus.