Optical coupling element and optical fiber connector using same

An optical fiber connector, comprising:

• a printed circuit board (PCB) comprising a supporting surface and a photoelectric conversion chip positioned on the supporting surface and electrically connected to the PCB;
• an optical coupling element positioned on the PCB, the optical coupling element comprising:
• a first side surface;
• an upper surface connected to the first side surface, the upper surface defining a first cavity;
• wherein the optical coupling element defines a recess in a border of the upper surface and the first side surfaces, the upper surface defines a blind hole adjacent to the first cavity, the blind hole and the first cavity are spaced by a distance, a fixing portion is formed between the blind hole and the recess, the fixing portion defines a tapering hole communicating with the blind hole and the recess, the blind hole comprises an vertical surface, the fixing portion comprises a first sidewall and a second sidewall opposite to the first sidewall, the first sidewall communicates with the recesses and opposite to the vertical surface, and the second sidewall communicating with the blind hole;
• an optical fiber inserted into the tapering hole with an end of the optical fiber received in the blind hole, the optical fiber and the vertical surface of the blind hole spaced by a distance, a receiving hole defined between the vertical surface and the optical fiber;
• and
• an optical adhesive filled into the receiving hole to firmly attach the optical fiber onto the vertical surface without any gap or space.