Younghyun Kim

Recent published work of depletion-type Si optical modulator with SiGe layer by PETRA and Univ. of Tokyo Congratulations !  Click here to the original web http://iopscience.iop.org/article/10.7567/APEX.11.032201/meta Abstract We developed a high-speed and highly efficient depletion-type Si optical modulator (Si-MOD) with a pn junction by applying a p-type-doped strained SiGe layer, which was stacked on a lateral pn junction-type Si-MOD. We designed an optimum Si-MOD, which is one of the most efficient Si-MODs with a pn junction, and demonstrated highly efficient modulations of 0.67 and 0.81 Vcenterdotcm for V π L at dc reverse bias voltages of −0.5 and −2 Vdc, respectively. We also demonstrated a high-speed operation of 25 Gbps for the Si-MOD at a wavelength of around 1.3 µm.

Talk on Feb 2nd  HP in Palo Alto (Host: Dr. Marco) The talk was mainly based on the work with the title of " Carrier-injection Type Strained SiGe Optical Modulators " which was conducted by Takagi-Takenaka Group in the University of Tokyo.

Simulation of high-power laser diodes with improved heat sinking structure using epitaxial liftoff technique ( Abstract , Proceeding )  on 29th Jan 2018  (Details of this work will be shown by the journal publication in progress) And, a short advertisement for PyeonChang 2018 winder olympic and paralympic games :) Importantly, Acknowledgement This work was supported by the Research Fund of High Efficiency Laser Laboratory of Agency for Defense Development of Korea (No.UD160069BD).

Jan 27th to Feb 1st Enjoyed BIOS, LASE and OPTO Details in Korean

I attended ISPEC2017, which is the conference in the research field of Si Photonics, held in Komaba campus of Univ. of Tokyo.  It was a great chance to hear very informative talks by invited speakers as follows: Y. Arakawa ( Univ. of Tokyo, PECST ) - Advances in Photonics and Electronics Convergence System Technology - AIO Core (Spinoff company from PECST project) L. C. Kimerling ( MIT, AIM Photonics ) - Silicon Photonics: Grand Challenges and Key Needs for 2018  - integration , standardization, cross-market platforms and supply chain coordination John Bowers ( UCSB ) - Reliable , High Efficiency, Low Threshold Current Quantum Dot Lasers - Heterogeneous integration of 6 Photonic Platform  Alexandra Wright- Gladstein ( Ayar Labs, Inc. ) - It’s Time for Optical I/O - Formed by the inventors of the first processor with optical I/O  Z. Zhou ( Peking Univ. ) - On-chip Polarization Control for Silicon Photonic Integration...

I had a oral presentation with the title of "Modulation performance optimization of 50-Gbps Si micro-ring modulators".  The presentation is like "begin again" for me, because It was the first time to have a presentation at the conference for a new task after my PhD work. More information PDF Details in Korean

실리콘 포토닉스 분야의 Si 마이크로 링 광변조기의 변조특성 최적화에 관한 발표 내용입니다. 2017년 11월 9일 제주에서 구두 발표 예정입니다. ( 시간표 ) Title Modulation performance optimization of 50-Gbps Si micro-ring modulators Abstract We present the results of the modulation performance optimization for the depletion-type Si micro-ring modulator. With analyses based on TCAD simulations and the coupled-mode theory, the optimal device geometry for obtaining the largest optical modulation amplitude for 50-Gbps operation is determined. More information  about the conferencne