| Project/Area Number |
01850069
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
電子通信系統工学
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| Research Institution | Toyohashi University of Technology |
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Principal Investigator |
MIYAZAKI Yasumitsu Toyohashi University of Technology, Department of Information and Computer Sciences, Professor, 工学部, 教授 (00023169)
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| Co-Investigator(Kenkyū-buntansha) |
GOTO Nobuo Toyohashi University of Technology, Department of Information and Computer Scien, 工学部, 講師 (60170461)
山家 光男 岐阜大学, 教養部, 助教授 (90159202)
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| Project Period (FY) |
1989 – 1991
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| Project Status |
Completed (Fiscal Year 1991)
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| Budget Amount *help |
¥8,400,000 (Direct Cost: ¥8,400,000)
Fiscal Year 1991: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1990: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1989: ¥6,900,000 (Direct Cost: ¥6,900,000)
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| Keywords | Optical pickup / Integrated optics / Tapered waveguide / Acousto-optics / Magneto-optics / Pit scattering |
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| Research Abstract |
[1] Tapered waveguide device for bean focusing
Optical beam focusing characteristics from tapered waveguides were theoretically investigated. It was found that the output beam was focused at a distance 60mum from the end facet with the spot size of 3. lmum. The control of the focal length due to electro-optic effect was also studied.
[2] Beam control in graded-index waveguide
Focusing of optical guided waves was demonstrated with a graded-index waveguide formed by Ti indiffusion. An optimum index distribution was found using wave optics. Restoration of degraded optical beams by means of spatial filtering and propagation characteristics of multiple beams were discussed.
[3] Magneto-optic devices
Waveguide-type monosectional optical isolators using magneto-optic mode-conversion were studied and fundamental properties for isolators and circulators were clarified. High-speed optical switching by magnetostatic surface waves was demonstrated and an efficient device with multilayer structure was discussed.
[4] Switching and deflection using acousto-optic devices
Wavelength-selective switching was demonstrated with collinear acousto-optic devices fabricated on a LiNbO3 substrate. Deflection of multiple optical beams due to Bragg diffraction by SAW was also investigated.
[5] Scattering from pits
Optical scattering characteristics from pits of optical disks were theoretically analyzed using finite element and boundary element methods.
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