Method of connecting an optical fiber to an optical waveguide

A method of connecting an optical fiber to a planar optical waveguide, comprising the steps of:

• cutting a marker in a surface of a substrate in a longitudinal direction of planar optical waveguides to be formed;
• forming a lower cladding, planar optical waveguides and an upper cladding on the surface of the substrate to obtain a waveguide body;
• cutting a pin guide groove in a surface of the upper cladding in a longitudinal direction of the marker, by using the marker as a reference mark;
• cutting the waveguide body in a width direction of the planar optical waveguides to obtain a central chip and two opposite end chips;
• cutting a fiber guide groove in the surface of the upper cladding of each of the end chips in the longitudinal direction of the marker, by using the marker as a reference mark, so that each end chip serves as a fiber aligning jig;
• and
• abutting cut end faces of the fiber aligning jigs onto opposite cut end faces of the central chip, respectively, with an optical fiber placed in each of the fiber guide grooves and a guide pin laid along the pin guide grooves formed in the central chip and the end chips, aligning the planar optical waveguide and the optical fibers with each other, and bonding the chips in one piece.