1999 Fiscal Year Final Research Report Summary
Design and Performance of a Broadband Optical Modulator With Superconducting Electrodes
| Project/Area Number |
09555014
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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 | 展開研究 |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
YOSHIDA Keiji Graduate School of Information Science and Electrical Engineering, Kyushu University, Professor, 大学院・システム情報科学研究科, 教授 (80108670)
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| Co-Investigator(Kenkyū-buntansha) |
KANAYA Haruichi Graduate School of Information Science and Electrical Engineering, Kyushu University, Research Associate, 大学院・システム情報科学研究科, 助手 (40271077)
KIZU Takanobu Graduate School of Information Science and Electrical Engineering, Kyushu University, Associate Professor, 大学院・システム情報科学研究科, 助教授 (00221911)
ENPUKU Kenji Graduate School of Information Science and Electrical Engineering, Kyushu University, Associate Professor, 大学院・システム情報科学研究科, 助教授 (20150493)
INOUE Yasuyuki NTT Photonic Laboratory, Chief Researcher, 研究主任
NAGATSUMA Tadao NTT Telecommunications Energy Laboratories, Research Manager, 主幹研究員
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| Project Period (FY) |
1997 – 1999
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| Keywords | superconductor / optical modulator / microwave-optical device |
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| Research Abstract |
We have studied a low voltage optical modulator employing high Tc superconducting resonant-type electrodes for use in the sub-carrier optical transmission system in which microwave signals are carried by intensity modulated light-wave. It is shown that microwave modulation of light-wave can be made efficient by using superconducting electrodes with high Q-factor. A preliminary experiment using LiNbOィイD23ィエD2 (LN) optical modulator with YBaィイD22ィエD2CuィイD23ィエD2OィイD2xィエD2 (YBCO) electrode demonstrates dc and modulation of the optical wave.
1. The design of resonant type optical modulators with impedance matching circuits is presented, and YBCO thin films on MgO substrate were employed as the electrodes. It is shown by numerical calculation that the modulation efficiency increases when high Q superconductors are used as the electrodes.
2. We present a preliminary experiment on the optical modulator, which was realized by flip-chip bonding of LN and MgO substrates. Based on the design and calculation, modulation experiments were carried out at low temperatures. It was demonstrated that the optical modulator with high Tc Superconducting electrode by the flip-chip bonding method operated effectively.
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