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A high-efficiency optical transmitter module for PCB (printed circuit board)-based interconnections was fabricated using a bottomemitting VCSEL. The bottom-emitting VCSEL was directly bonded by an epoxy on a 90°-bent fiber connector which is inserted into the PCB to couple to the fiber layer embedded in the board. A ray trace simulation indicates that close contact between the VCSEL and the connector removes most of the losses due to Fresnel reflection and beam divergence. This tendency wasdoi:10.1364/oe.15.015767 pmid:19550861 fatcat:bskxrkr2tzbt7jfe4r7pzuqv5i