2020 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 waveguide / Group-IV semiconductor / VCSEL |
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| Outline of Annual Research Achievements |
In this JSPS research fund between Nov.2020 and Mar.2021, I have done some works to perform the experiment in the future. The finished works are list as below.
a. Built up the pump-probe measuring system with the edge and surface grating to perform the silicon photonic experiments via the nonlinear optical effect.
b. Fabricate the C-rich SiC and SiGe materials to test their nonlinear optical characteristics.
c. Fabricate the straight and micro-ring resonator SiN waveguides with Si quantum dots for four-wave mixing and nonlinear Kerr switching applications.
d. Cooperate with Prof. Gong-Ru Lin from National Taiwan University and Prof. Kent D. Choquette from University of Illinois Urbana-Champaign to demonstrate the photonic crystal structured multi-mode VCSELs enabling 92-Gbit/s QAM-OFDM transmission.
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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 improve the measuring system and test the performance of the materials and device. The detailed works are listed below.
a. Replace the lensed fiber and CCD monitor to improve the resolution of the pump-probe measuring system.
b. Test the nonlinear absorption and nonlinear refractive index coefficients of the C-rich SiC and SiGe materials
c. Test the performances of the four-wave mixing effect in the straight and micro-ring resonator SiN waveguides with Si quantum dots
d. Write the review paper about the transmission performance of the few-mode VCSELs invited by IEEE Photonic Journal and the tutorial paper about the carbon saturable absorber mode-locking laser invited by APL Photonics.
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| Strategy for Future Research Activity |
This project focuses on the composition and bonding control during variable Group-IV semiconductor synthesis to enable the efficient linear/nonlinear waveguide signal processing in a photonic chip. Some plans for future work can be achieved as shown below
a. Develop Group-IV semiconductor materials, heterojunction, and superlattice with the suppressed carrier lifetime below 10 ns and the enhanced nonlinear refractive index beyond 10-13 cm2/W by detuning the composition ratio of materials.
b. Construct the Group-IV semiconductor-based micro-ring resonator and add-drop waveguides to demonstrate an all-optical free-carrier absorption and nonlinear modulators with a SNR of 5-6 dB and the polarization-shift keying demodulator with an ER beyond 5 dB.
c. Construct Group-IV semiconductor-based logic gate, multiplexer, and Mach Zehnder modulator with Fano resonant.
d. Construct the fiber laser passively mode-locked by the Group-IV semiconductor saturable absorber to generate the pulsed carrier of optical transmission.
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