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8 February 2008 Flexible film waveguides with excellent bending properties
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We have developed a film waveguide which has excellent bending properties. The waveguide can be fabricated by existing exposure/development processes and facilities with a core and a cladding dry film. Based on the bending loss simulation results, we fabricated the film waveguides of which the core-cladding index difference (relative index difference) of the waveguide was 3.1% and were evaluated transmission and bending properties. The propagation loss measured by a cut-back method was 0.15dB/cm at wavelength of 850nm. There was little change in optical loss on a 360-degree bend test with a 2mm radius of curvature. No loss increase and no damage to the film waveguide were observed after MIT folding endurance test more than one hundred thousand times with a 2mm bending radius of curvature at -30, 23 and 85 °C. The film waveguide demonstrated good folding endurance over a wide range of temperatures.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Y. Maeda and Y. Hashiguchi "Flexible film waveguides with excellent bending properties", Proc. SPIE 6899, Photonics Packaging, Integration, and Interconnects VIII, 68990D (8 February 2008);

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