Design and Performance of LiNbO_3 Optical Modulator with a Superconducting Electrode
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概要
- 論文の詳細を見る
The performance of a LiNbO_3 optical modulator with a superconducting electrode as the transmission line of a travelingwave signal has been sutudied theoretically as well as experimentally. In the case of velocity matching between signal and optical waves using a shielding plane on top of a coplanar waveguide, numerical calculations of the attenuation constants of both superconducting and normal-conducting transmission lines indicate that the performance of the optical modulator is far superior to that using normal metals with respect to the figure of merit of bandwidth/driving voltage. Microwave characteristics of a traveling-wave-type LiNbO_3 optical modulator with a superconducting electrode (Nb) have been also studied experimentally in the temperature range from 300 K to 4.2 K. In the frequency range between dc and 26.5 GHz, it is shown that the obtained modulation depth is in good agreement with the theoretically expected one. The present results demonstrate the possible applications of superconducting electrodes to high-performance LiNbO_3 optical modulators.
- 社団法人応用物理学会の論文
- 1998-06-30
著者
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YOSHIDA Kenji
Department of Electronic Information Systems, Shibaura Institute of Technology
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Kanda Yutaka
Department Of Electronics Faculty Of Engineering Fukuoka Institute Of Technology
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UEZONO Itaru
Department of Electronic Device Engineering, Graduate School of Information Science and Electrical E
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Uezono Itaru
Department Of Electronic Device Engineering Graduate School Of Information Science And Electrical En
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Yoshida Kenji
Department Of Electronic Device Engineering Graduate School Of Information Science And Electrical En
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Yoshida Kenji
Department Of Chemistry Faculty Of Science Ehime University
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Yoshida Keiji
Department of Electronic Device Engineering, Graduate School of Information Science and Electrical Engineering, Kyushu University
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Uezono ltaru
Department of Electronic Device Engineering, Graduate School of Information Science and Electrical Engineering, Kyushu University
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