Ph.D.

Ryo Sugano (Doctoral Program)
Master course
- ECC Gakuen High School
- NEDO Research Assistant
- TA: Electrical and Computer Engineering Seminar II, Photonics
- r.sugano@phot.elec.keio.ac.jp
- 14-505
- 045-566-1730 ( ext. 42285 )
Bio:
He enjoys gaming and outdoor activities. Recently, he has been collecting PlayStation trophies.
Achievements (International Journals)
- Ryo Sugano, Junnosuke Kokubu, Ryo Otake, Shun Fujii, and Takasumi Tanabe, "Broadbandwidth edge coupler structure for SiN-Si heterogeneous integration," IEICE Transactions (accepted for publication)
- Ryo Sugano, Junnosuke Kokubu, Takumasa Kodama, Sengji Jin, Jocelyn Hofs, Jianwei Zhang, Makoto Okano, and Takasumi Tanabe, "Compact photonic crystal spectrometer with resolution beyond the fabrication precision," Optics Express, Vol. 32, Issue 12, pp. 21563-21576 (2024).
Achievements (International Conferences)
- Ryo Sugano, Mantaro Imamura, Ayaka Yomoda, Soma Kogure, Junnosuke Kokubu, Shun Fujii, and Takasumi Tanabe, "Low-latency optical communication with microresonator frequency comb as a light source," 14th International Symposium on Photonics and Electronics Convergence (ISPEC2024), P12, Tokyo ( Hybrid), Nov. 26-27 (2024).
- Ryo Sugano, Ryo Otake, Ryo Nishihata, Shun Fujii, and Takasumi Tanabe, "Edge coupler design for SiN/Si butt coupling integration," 29th Microoptics Conference (MOC2024), 0111, Kaohsing, Sep. 29-Oct. 2 (2024).
- Ryo Sugano, Junnosuke Kokubu, Ryo Otake, Ryo Nishihata, Shun Fujii, and Takasumi Tanabe, "SiN/Si hybrid integration via inversed taper edge coupler," 13th International Symposium on Photonics and electronics Convergence (ISPEC2023), P-31, Tokyo, Nov. 1-2 (2023).
- Ryo Sugano, Ryo Otake, Ryo Nishihata, Shun Fujii, and Takasumi Tanabe, "SiN/Si Heterogeneous Integration with Butt-coupling," The 12th Asia-Pacific Laser Symposium (APLS2023), PDW-05, Hakodate, Sep. 4-7 (2023).
- Ryo Sugano, Ryo Otake, and Takasumi Tanabe, "SiN/Si Hybrid Integration with Edge Couplers by Butt-coupling," Progress In Electromagnetics Research Symposium (PIERS2023), 1A4a-13:30, Prague, Jul. 3-6 (2023).
- R. Sugano, R. Nishihata, and T. Tanabe, "Impedance and mode matching for high-efficiency Si/SiN waveguides coupling," 12th International Symposium on Photonics and Electronics Convergence (ISPEC2022), P-22, Tokyo (Hybrid), Dec. 1-2 (2022).
- R. Sugano, S. Jin, J. Hofs, K. Yube, K. Nagashima, T. Kodama, and T. Tanabe, "Low-cost photonic crystal spectrometer using up-conversion," Conference on Lasers and Electro-Optics Pacific Rim 2022 (CLEO-PR 2022), CFP8I-01, Sapporo (Hybrid), Jul. 31-Aug. 5 (2022).

Wang Heng (Doctoral Program)
Heng WANG
- Beijing University of Posts and Telecommunications
- IGP Course
- h.wang@phot.elec.keio.ac.jp
- 14-505
- 045-566-1730 ( ext. 42285 )
Achievements (International Conferences)
- Heng Wang, Ryo Otake, Riku Imamura, Liu Yang, Hayato Matsuyama Shun Fujii, and Takasumi Tanabe, "Investigating the Mechanism Behind the Formation of a Stable sech2-shaped Raman Comb in a Silica Microtoroid Driven by Continuous-Wave with Specific Dispersion," CLEO/Europe-EQEC, EF-7.3, Munich, Jun 23 -27 (2025).

Junnosuke Kokubun (Doctoral Program)
Junnosuke KOKUBU
- Toin Gakuen High School
- TA: Electrical and Computer Engineering Experiment (Fall)
- j.kokubu@phot.elec.keio.ac.jp
- 23-201B
- 045-566-1730 ( ext. 42285 )
Achievements (International Journals)
- Ryo Sugano*, Junnosuke Kokubu*, Takumasa Kodama*, Sengji Jin, Jocelyn Hofs, Jianwei Zhang, Makoto Okano, and Takasumi Tanabe, (*equal contribution), "Compact photonic crystal spectrometer with resolution beyond the fabrication precision," Optics Express, Vol. 32, Issue 12, pp. 21563-21576 (2024). "Compact photonic crystal spectrometer with resolution beyond the fabrication precision," Optics Express, Vol. 32, Issue 12, pp. 21563-21576 (2024).
Achievements (International Conferences)
- Junnosuke Kokubu, Ko Sato, Ayaka Yomoda, Satoki Kawanishi, Ryo Sugano, Mantaro Imamura, Hitomi Uemura, Shun Fujii, and Takasumi Tanabe, "Bypassing the von Neumann Bottleneck via Direct 300-GHz RF Conversion of Optical Computation Results ," CLEO/Europe-EQEC, CI-6.6, Munich, Jun 23-27 (2025).
- Junnosuke Kokubu, Ryo Sugano, Minoru Ohtsuka, Nobuyuki Yokoyama, Makoto Okano, and Takasumi Tanabe, "Small Spectrometer With Extremely High- Resolution (0.07 nm) Realized With an Improved Reconstruction Algorithm," CLEO:2023, STh4G.7, San Jose, May 7-12 (2023).
Special Short-term International Students

Liu Yang (PhD candidate)
Liu YANG
- Xi'an Jiaotong University
- Special Short-term International Students
- l.yang@phot.elec.keio.ac.jp
- 14-505
- 045-566-1730 ( ext. 42285 )
Bio: