Ph.D.

Ryo Kanno ( M1 )

Ryo Sugano (Doctoral Program)

Master course

  • ECC Gakuen High School
  • NEDO Research Assistant
  • TA: Electrical and Computer Engineering Seminar II, Photonics

Bio:
He enjoys gaming and outdoor activities. Recently, he has been collecting PlayStation trophies.

Achievements (International Journals)

  1. 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)
  2. 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)

  1. 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).
  2. 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).
  3. 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).
  4. 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).
  5. 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).
  6. 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).
  7. 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

Achievements (International Conferences)

  1. 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 Information Engineering Laboratory (Fall) / Electrical and Information Engineering Seminar II

Achievements (International Journals)

  1. Junnosuke Kokubu, Ko Sato, Ayaka Yomoda, Mantaro Imamura, Ryo Sugano, Bowen Liu, and Takasumi Tanabe, "Compute-and-Transmit Photonic Convolution Using a Microcomb-Driven 300 GHz Wireless Link," Optics Express, Vol. 34, No. 10, pp. 18704-18716 (2026). 
  2. 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)

  1. 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).
  2. 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).

Yoshitake Yamaguchi (Doctoral Program)

Kai YAMAGUCHI

  • TA: Electrical and Computer Engineering Experiment (Fall)

Achievements (International Journals)

  1. Kai Yamaguchi, Hiroki Moriguchi, Zhiming Shi, Hajime Kumazaki, Hairun Guo, Takasumi Tanabe, and Shun Fujii, "Self-injection-locked bright and dark-pulse microcomb generation in ultrahigh-Q crystalline microresonators," Optics Letters (2026) (accepted for publication).

Achievements (International Conferences)

  1. Kai Yamaguchi, Hiroki Moriguchi, Hajime Kumazaki, Takasumi Tanabe, and Shun Fujii, "Generation of anomalous and normal dispersion frequency combs in an MgF2 WGM microresonator via self-Injection Locking," APS Global Physics Summit, MAR-P51-5:06, Denver, 15-20 March (2026).

Yusei Ando (Ph.D. candidate)

Yusei TANTO

  • University of Tsukuba High School
  • TA: Electrical and Computer Engineering Experiment (Fall)

Achievements (International Conferences)

  1. Yusei Tanto, Tomohiro Tetsumoto, Takasumi Tanabe, and Norihiko Sekine, "Whole microcomb modulation schemes based on optical intensity modulation for sub-terahertz wireless communication," Conference on Lasers and Electro-Optics 2026 (CLEO2026), STH2E.5, Charlotte, May 17-21 (2026).
  2. Yusei Tanto, Tomohiro Tetsumoto, Takasumi Tanabe, and Norihiko Sekine, "Investigation of the effect of relative phases of microcomb lines on sub- terahertz transmission using whole-comb modulation," The 15th Advanced Lasers and Photon Sources Conference (ALPS2026) ALPS-I2-04, Yokohama, Apr. 20-14 (2026). 20-14 (2026).
  3. Yusei Tanto, Ayaka Yomoda, Junnosuke Kokubu, Ryo Sugano, and Takasumi Tanabe, "Demonstration of Nighttime Thermoelectric Power Generation with Demonstration of Nighttime Thermoelectric Power Generation with Radiative Cooling Utilizing Low-cost Commercial Materials," The 16th Pacific Rim Conference on Lasers and Electro-Optics (CLEO-PR 2024), P1-036, Incheon, Aug. 4-9. Incheon, Aug. 4-9 (2024).
  4.  

Special Short-term International Students

Zhiming Shi (PhD candidate)

Zhiming SHI

  • Shanghai University
  • 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: