2021 Fiscal Year Annual Research Report
Group-IV semiconductor based photonic waveguide devices for versatile pulsed data processing
| Project/Area Number |
20F20374
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| Research Institution | The University of Tokyo |
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Principal Investigator |
山下 真司 東京大学, 先端科学技術研究センター, 教授 (40239968)
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| Co-Investigator(Kenkyū-buntansha) |
CHENG CHIH-HSIEN 東京大学, 先端科学技術研究センター, 外国人特別研究員
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| Project Period (FY) |
2020-11-13 – 2023-03-31
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| Keywords | Silicon photonics / Nonlinear optics / Group-IV semiconductor / Mode-locked fiber laser / VCSEL |
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| Outline of Annual Research Achievements |
In this JSPS research fund between Apr.2021 and Mar. 2022, I have done some works to perform the experiment in the future. The finished works are list as below. a. Improve the pump-probe system with a coupling losses of 7 dB for the edge coupling and 5 dB for the surface coupling. b. Test the performance of the graphene covered SiN waveguide. c. Fabricate the graphene oxide covered side-polished fiber with the different graphene-oxide thickness. d. Cooperate with Prof. Gong-Ru Lin from National Taiwan University to demonstrate the All-Optical 25-Gbps Silicon Carbide Kerr Switching Intensity Modulator and Ge saturable absorber for the mode-locking Er-doped fiber laser. e. Demonstrate the mode-locking state switchable Er-doped fiber laser based on the graphene oxide saturable absorber and nonlinear polarization rotation. f. Cooperate with Prof. Constance J Chang-Hasnain from UC Berkeley and Corning Inc. to demonstrate the VCSEL based data-center communoication, respectively.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
In the current stage, I still test the performance of the device. The detailed works are listed below. The results will be beyond our expectations.
a. The wavelength-dependent saturation phenomenon on the all-optical modulation depth will be observed and characterized
b. The switching power variation of this graphene or graphene oxide-based cross-wavelength data converter will be investigated by injecting different probe wavelengths
c. Test the limitation of the modulation speed of the data converter based on the graphene and graphene oxide-covered side-polished single-mode fiber or waveguide
d. Write the tutorial paper about the All-optical Group-IV-material optical modulator based nonlinear optical effect invited by APL Photonics.
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| Strategy for Future Research Activity |
This project focuses on the efficient linear/nonlinear fiber/waveguide signal processing in Silicon Photonics application. Some plans for future work can be achieved as shown below
a. Replace the lensed fiber and CCD monitor to improve the resolution of the pump-probe measuring system.
b. Observe the four-wave mixing in the SiNx waveguide with buried Si quantum dots.
c. Construct the graphene or graphene oxide-based cross-wavelength data converter or biosensor.
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