2002 Fiscal Year Final Research Report Summary
Development of high gain and broadband superconducting booster circuit for optical modulator
| Project/Area Number |
12555013
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 展開研究 |
|---|
| Research Field |
Applied optics/Quantum optical engineering
|
|---|
| Research Institution | Kyushu University |
|---|
Principal Investigator |
YOSHIDA Keiji Kyushu University, Graduate School of Information Science and Electrical Engineering, Professor, 大学院・システム情報科学研究院, 教授 (80108670)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
KANAYA Haruichi Kyushu University, Graduate School of Information Science and Electrical Engineering, Research Associate, 大学院・システム情報科学研究院, 助手 (40271077)
KISU Takanobu Kyushu University, Graduate School of Information Science and Electrical Engineering, Associate Professor, 大学院・システム情報科学研究院, 助教授 (00221911)
ENPUKUK Keiji Kyushu University, Graduate School of Information Science and Electrical Engineering, Associate Professor, 大学院・システム情報科学研究院, 助教授 (20150493)
UCHIYAMA Tetsuji CRL, KARC Superconductive Electronics Group, Research Fellow, 超伝導研究室, CRL特別研究員(研究職)
王 鎮 情報総合研究所, 超伝導研究室, 室長(研究職)
WANG Zhen CRL, KARC Superconductive Electronics Group, Leader
|
|---|
| Project Period (FY) |
2000 – 2002
|
| Keywords | Superconductor / Optical Modulator / Microwave-Optical Device |
|---|
| Research Abstract |
The design and performance of a LiNbO3 optical modulator and switch, which employ superconducting circuits, have been studied. Based on a novel design method of the booster circuit using superconducting coplanar waveguide transmission lines, we designed a voltage amplifier with center frequency of 10GHz, bandwidth of 5MHz, and the voltage gain of 33dB using an electromagnetic wave simulator. We also designed a high-speed optical switch combining optical directional coupler and Mach-Zehnder interferometer.
A preliminary experiment with YBCO electrode on MgO substrate flip-chip-bonded on LiNbO3 optical waveguide has been made. We designed the booster circuit with the meanderline 3-pole Chebyshev filter fabricated by a YBCO thin film on a MgO substrate with the dimension of 10[mm]×10[mm]. The YBCO electrode on MgO substrate was flip-chip bonded onto an optical waveguide in a LiNbO3 substrate, and was cooled down by a refrigerator. The comparison of the observed group delay of S11 (return loss) of the device and the simulation results. The observed data are in reasonable agreements with those expected from theory.
|
