Demonstration of on-PCB optical interconnection using surface-mount package and polymer waveguide

An on-PCB optical interconnection using surfacemountable optoelectronic packages and a polymer waveguide is described. A new packaging concept called "OptoBump", which is a shon-distance free-space optical coupling between the optoelectronic package and the PCB, provides full compatibility with surface-mount technology. First, two prototype packages that contain a VCSELRD array chip inside the cavity of an interposer were developed. Both operated normally. Next, a polymer waveguide with 45" mirrors was found to achieve a loss as low as 4 dB/m. Finally, 1.25 Gbit/s x 3-channel parallel optical interconnections over a 30-nun-long waveguide on the PCB were successfully demonshated. This demonstration clearly exhibits the great potential to provide low-cost, high-performance optical interconnections on a PCB.

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