Patent ID: 6396984
Filing Date: 2002-05-28
Classification: G02B

Abstract:
A mode shape converter interposed between an input or output terminal of a function executing unit included in an optical device and an optical fiber and adapted to couple a mode of the optical fiber with a mode of the input or output terminal of the function executing unit, the mode shape converter comprising:a substrate; a lower clad coated over the substrate, the lower clad having an etched portion in a desired region; a lower rib waveguide formed on the etched portion of the lower clad; a core formed over the entire upper surface of both the lower rib waveguide and the non-etched portion of the lower clad; an upper rib waveguide formed on the core such that it is aligned with the lower rib waveguide, the upper rib waveguide having a desired shape; and an upper clad formed over both the upper rib waveguide and a portion of the core not covered with the upper rib waveguide.