We fabricated single mode optical waveguides made of perfluoropolymers with extremely low propagation loss at communication wavelengths reaching even 1650 nm, and found they showed high reliability. The used materials are poly(perfluorinated butenyl vinyl ether) and the chemically-related materials. In the previously reported trial, we used the doped core in order to adjust the refractive index. The propagation loss was low enough for us to use at 1310 and 1550 nm, but the existence of dopant limited the loss reduction. In this paper we report on the perfluoropolymer optical waveguides with dopant-free core. The propagation loss was 0.03-0.04 dB/cm at both 1550 and 1650 nm. The spectral measurement showed that their propagation losses are lower than 0.1 dB/cm all over the communication wavelengths. High durability to humidity was also shown. As an application of this optical waveguide, we demonstrated the 1x32 splitter.
We have been developing a special purpose parallel processor system with a compact size and a high performance specific for the scientific computation. A multichip module (MCM) with a high speed bus is indispensable to achieve such parallel processor system. We have developed a high speed bus for such MCM using a polyimide optical waveguide with micro-mirrors. We can easily obtain many output signals from one input signal in this optical waveguide. Such polyimide optical waveguide with micro-mirrors is formed on a MCM substrate which is called an optical plate. An optical coupling between the polyimide optical waveguide and the laser diode or the photodetector on LSI chips is performed through the micro-mirror. We observed twenty output signals for the photodetectors from one input signal in the polyimide waveguide of fabricated test module. We have also evaluated the performance of parallel processor system using such MCM with the polyimide optical waveguide by computer simulation.
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