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An optical interconnection module directly integrated on a flexible optical/electrical hybrid printed circuit board (O/E hybrid PCB) is presented. A newly proposed polymeric optical waveguide plays roles in the optical path and in a platform as an O/E hybrid PCB integrated with various optical/electrical components. The fabricated flexible O/E hybrid PCB had sufficient optical characteristics such as a low bending loss and propagation loss and a low total transmission loss including waveguide loss and coupling losses of the module calculated to 15 dB. The suggested optical interconnection was also successfully demonstrated with a 5-Gb/s data transmission through the module.