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In recent years, transmission rate of access systems and home local area networks (LANs) have already reached the gigabit range, and in the near future, it is thought that even higher transmission rate (of 3-10 Gbps) will be necessary for high-definition video such as 4K and 8K television. As a result, attention has been drawn to optical transmission systems using large-core graded-index plastic optical fiber (GI-POF), which enables high-speed transmission with a thin diameter and good handling characteristics. This report describes an optical module for high-speed transmission, suitable for large-core GI-POF, which can be inexpensively supplied by using a new structure and assembly method employing die bonder mounting precision and a glass epoxy board. [ABSTRACT FROM AUTHOR]