| Project/Area Number |
14350187
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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 |
電子デバイス・機器工学
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| Research Institution | Osaka University |
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Principal Investigator |
KOBAYASHI Tetsuro Osaka University, Graduate School of Engineering Science, Professor, 基礎工学研究科, 教授 (10029522)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHARA Junichi Osaka University, Graduate School of Engineering Science, Associate Professor, 基礎工学研究科, 助教授 (90273606)
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| Project Period (FY) |
2002 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥14,400,000 (Direct Cost: ¥14,400,000)
Fiscal Year 2003: ¥6,200,000 (Direct Cost: ¥6,200,000)
Fiscal Year 2002: ¥8,200,000 (Direct Cost: ¥8,200,000)
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| Keywords | Ultrafast Control of Light / Light Deflector / Higher than 10GHz / Optical Frequency Shifter / Domain Inversion / Electrooptic Crystal / Bragg Diffraction / Raman-Nath Diffraction |
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| Research Abstract |
The purpose of this study is to develop an optical high frequency (>10 GHz) shifter by improving the diffraction type of the traveling phase grating device, which was invented and has been studied by us, from the Raman-Nath type to the Bragg type. The qualitative improvement on our device operation has been achieved based on the narrow-width slant periodic domain inversion technique to an electrooptic (EO) crystal. The target devices will be useful for an optical microwave interface, optical WDM communication, and scientific and industrial measurements.
The new frequency shifter is similar to an acoustooptic (AO) frequency shifter. However, it is possible to operate in the higher frequency range (>10GHz), where conventional AO device never operates.
We designed and fabricated new frequency shifter by applying 20μm domain inversion technique to LiTaO_3 electro-optic crystal. The operation of the Bragg diffraction type frequency shifter with 16GHz frequency shift arid 82% conversion efficiency was experimentally confirmed for the first time. This result is to be published on IEEE Photonics Technology Letters.
In addition, we proposed anew kind of ultrafast electrooptic deflector and flat-optical frequency comb generator utilizing transversal variation of the widths of reversed areas in periodic domain inversion. Both of new devices were designed and fabricated. It was confirmed experimentally that the new deflector has subpicosecond (<1ps) deflection speed and 32 resolvable spots and new comb generator can generate the widest flat sidebands (0.8THz -3 dB bandwidth) as an external phase modulation method.
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