Optical transmission device and coupling method thereof

An optical transmission device, including:

• a substrate, having an end surface, a first positioning portion, and an optical transmission channel being exposed on the end surface;
• a jumper, having a mounting portion and a second positioning portion, and the mounting portion abuts the end surface of the substrate, and the second positioning portion and the first positioning portion limit each other;
• and
• an optical fiber, connecting to the mounting portion, and an end surface of the optical fiber corresponds to the optical transmission channel;
• wherein the first positioning portion is a positioning hole extending in a direction transverse to an axial direction of the optical fiber, and the second positioning portion is a column inserted in the positioning hole;
• wherein the jumper further includes at least one protrusion abutting against the end surface of the substrate to form a gap between the end surface of the substrate and the mounting portion, the optical fiber has an end portion extending into the gap, an optical material is disposed in the gap and binds the end portion of the optical fiber, and the end surface of the optical fiber faces the end surface of the substrate and is substantially aligned with an end surface of the protrusion.