| Budget Amount *help |
¥17,160,000 (Direct Cost: ¥13,200,000、Indirect Cost: ¥3,960,000)
Fiscal Year 2012: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2011: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2010: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2009: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
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| Research Abstract |
Two types of spot-size converter (SSC) have been successfully realized. The polarization-insensitive vertical down taper type was easily realized with a simple process employing reactive etching technique. The process can fabricate the vertical down-taper to silicon waveguides that has horizontally up taper structure. The tunnel-coupled type was obtained by depositing a gap layer on the silicon waveguide with the horizontal up taper, and then depositing a cap layer onto it. The TM-like mode was measured to couple from Si waveguide to the cap layer, whereas the TE-like mode propagates along the Si-waveguide without coupling to the cap layer. The phenomena show that the structure operates as the polarization splitter. As far as the TM-like mode concerned, the structure operates as the SSC nicely. Also robust and high-focusing power two types of lensed fibers, HILC and plano-convex, have beensuccessfully obtained. The robustness was attained by employing commercially available fiber ferrules. Mechanically robust and user-friendly lensed fibers have been obtained. Excellent lensed fibers with a high focusing power and long working distance characteristics have been successfully obtained with the process.
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