It is one of the major bottlenecks to bridge various optoelectronic devices, such as laser diodes, optical waveguides and photodetectors in ultra low-loss optoelectronic interconnects, which are often fabricated using different technologies with different optical apertures. To solve this problem, 3D tapered optical polymeric waveguides are presented to provide the mode- matching among these optoelectronic components. Compression- molded polymeric waveguides presented herein is probably the only solution to bridge huge dynamic range of different optoelectronic device-depths varying from few microns to few hundreds microns. Both the design rule and fabrication technique are presented together with some experimental results. It is shown that such a 3D tapered waveguide can provide an effective optical coupling at a relaxed alignment tolerance.© (1997) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.