2012 Fiscal Year Final Research Report
Research on silicon-based high-index contrast optical technologies
| Project/Area Number |
21360161
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Electron device/Electronic equipment
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| Research Institution | Utsunomiya University |
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Principal Investigator |
SHIRAISHI Kazuo 宇都宮大学, 大学院・工学研究科, 教授 (90134056)
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| Co-Investigator(Kenkyū-buntansha) |
YODA Hidehiko 宇都宮大学, 大学院・工学研究科, 准教授 (30312862)
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| Project Period (FY) |
2009 – 2012
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| Keywords | シリコン / 光ファイバ / レンズドファイバ / 光通信 / NA |
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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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