Method of manufacturing optical multiplexer and optical multiplexer manufactured thereby

A method of manufacturing an optical multiplexer (MUX), the method comprising:

• preparing a mold including a plate-shaped upper mold which has multiple first aspherical depressions having an aspherical surface shape and formed in a lower surface of the upper mold so as to form multiple columnar depression arrays, and a lower mold which has a plate shape corresponding to the upper mold and has multiple block-forming grooves having a triangle shape in vertical section and formed in an upper surface of a lower mold at positions corresponding to the columnar depression arrays;
• placing a raw material between the upper mold and the lower mold and pressing the molds in the vertical direction, thus forming a molded product with multiple microarray lens layers and multiple optical blocks formed in upper and lower surfaces thereof, respectively;
• and
• cutting vertically the molded product in a row direction after removing the molded product from the mold, thus obtaining an optical MUX.