Patent ID: 8157456

Claim:
A method for forming an optical waveguide, comprising: providing a light emitting device which emits a light and a light receiving device which receives the light on an electrical wiring substrate; providing an alignment mark for a position of a light emitting point of the light emitting device and an alignment for a position of a light receiving point of the light receiving device; mounting the light emitting device and the light receiving device over a substrate; forming a 3-dimensional optical waveguide optically connecting the light emitting device and the light receiving device in accordance with the alignment marks; providing a plurality of electrical pads for the light emitting device and the light receiving device on the substrate such that the light emitting point of the light emitting device and the light receiving point of the light receiving device have a height which aligns with a height of an optical axis of the 3-dimensional optical waveguide; or providing at least one bump for at least one of the light emitting device and the light receiving device on the substrate such that the light emitting point of the light emitting device and the light receiving point of the light receiving device have a height which aligns with a height of an optical axis of the 3-dimensional optical waveguide; and substantially aligning the light emitting device, the light receiving device, and the 3-dimensional optical waveguide in a linear manner, wherein said forming a 3-dimensional optical waveguide comprises forming the lower clad layer, the core layer and the upper clad layer on a substrate, then beaming a laser to remove at least the core layer and upper clad layer by forming grooves and an isolating narrow path which optically connects the light emitting device and the light receiving device in accordance with the alignment marks.