Tsuda Lab. - Electronics and Electrical Engineering, Keio University

About

Towards Realizing an Ultra-large Capacity and Power Saving Photonic Network

The Internet has become an indispensible part of today’s life. It was realized thanks to the development of the optical communication technology, which allowed a dramatic reduction of the communication cost both per bit and distance. To support the next generation network and the advent of a ubiquitous environment, advanced infrastructures are required, such as: transmission system with higher efficiency and larger capacity; communication nodes with lower power consumption and improved throughput; and speed-up of the access and local area network. In accordance with these challenges, our laboratory, going by the slogan "Connect the World through Light," is implementing researches on: ultra-fast, small, and power saving photonic switch; ultra-fast optical signal processing circuit; and advanced network systems, etc.

News & Information

2023/10/20: Updated Navigation Video for 3rd-year students.
2023/10/20: Updated Navigation for 3rd-year students Lab.Introduction.
2023/09/29: Y.Hoshiyama (M1) presented his research at PSC 2023 on "Demonstration of 10 Gbps Packet Transmission in Si-Photonics-Based In-Vehicle Optical Network (SiPhON)".
2023/09/29: S.Kimura (M1) presented his research at PSC 2023 on "+30.8 dBm, IM-DD, 32 Gbit/s high power optical transmission with a 4-km photonic bandgap fiber".
2023/09/28: Y.Takai (M1) presented his research at PSC 2023 on "An optical wavelength filter with reduced crosstalk consisting of a Si arrayed-waveguide grating and Bragg tunable grating filters".
2023/09/28: H.Sasazawa (M1) presented his research at PSC 2023 on "Novel coupling structure with an angled cut fiber and a tapered silicon waveguide suitable for surface mount large port count applications".
2022/10/21: Updated Navigation for 3rd-year students Lab.Introduction.
Lab.Introduction.
2019/09/17: S.Ishikura(M1) presented his research at FiO 2019 on "Coherent LiDAR detection system optimized for reducing the effect of speckles on the detector aperture based on a dedicated simulation program.". Conference report was uploaded.
2019/09/11: F.Nakamura and her co-authors' paper won IEICE Electronics Express(ELEX) Best Paper Award in the year 2018.Certification of achievement was uploaded.
2019/08/07: F.Nakamura(D1) presented her research at ICOCN 2019 on "Characteristics of 1×2 Silicon Wavelength Selective Switch Using Arrayed – Waveguide Gratings with Fold-Back Waveguides".
2019/07/11: H.Kobatashi(M2) presented his research at PSC 2019 on "Spatial Mode Multiplexer for 42 Single Mode Fibers to the 7-Core, 6-Mode Fiber". Conference report was uploaded.
2019/07/11: K.Sato(M2) presented his research at PSC 2019 on "Multistage Silicon Wavelength Multi/Demultiplexer using an Arrayed-Waveguide Grating and Bragg Grating Filters". Conference report was uploaded.
2019/07/07: F.Nakamura(D1) won Best Poster Award on ePIXfab Silicon photonics Summer School (4th edition). Certification of achievement was uploaded.
2019/04/26: K.Sakamoto(M1) won Best Presentation Award on Technical Committee on OpteElectronics of IEICE 2019 April. Certification of achievement was uploaded.
2019/03/28: F.Nakamura won Fujiwara Award, Keio University.
2018/10/18: Updated Navigation for 3rd-year students Lab.Introduction.
2018/09/19: H.Kobayashi (M1) presented his research at PSC 2018 on"Spatial Mode Multiplexer for 35 Single Mode Fibers to the 7-Core, 5-Mode Fiber". Conference report was uploaded.
2018/09/19: K.Sato (M1) presented his research at PSC 2018 on"Low-Crosstalk Multistage Silicon Wavelength Multi/Demultiplexer". Conference report was uploaded.
2018/09/19: Y.Okuno (M2) presented his research at PSC 2018 on"Polarization Diversity Circuit Using Photonic Crystal Waveplates for 1.2-µm Quantum Dot Semiconductor Optical Amplifiers". Conference report was uploaded.
2018/04/27: Fumi Nakamura (M2) won Best presentation award on Technical Committee on OptoElectronics of IEICE 2018 April. Certificate of achievement was uploaded.
2017/11/16: Fumi Nakamura (M1) won Best poster award on the 29th Symposium on Phase Change Oriented Science (PCOS) for her study on "Current driven optical gate switch using a Ge2Sb2Te5 thin film and an indium tin oxide heater". Certificate of achievement was uploaded.
2017/10/23: Updated Navigation for 3rd-year students Lab.Introduction.
2017/09/17: Y.Okuno (M1) presented his research at ECOC 2017 on”Wavelength-Selective External-Cavity Laser Using an Optical Switch Integrated Arrayed-Waveguide Grating for T-band Communications” Conference report was uploaded
2017/07/24: F.Nakamura (M1) presented her research at PS 2017 on”1×2 Silicon Wavelength Selective Switch Using Fold Back Arrayed-Waveguide Gratings” Conference report was uploaded
2017/07/24: M.Suziki (M1) presented his research at IPR 2017 on”Wideband, Transmission Flattened Arrayed Waveguide Grating Router for T-band and O-band Communication” Conference report was uploaded
2017/06/25: Y.Okuno (M1) presented his research at CLEO 2017 on”Wavelength-Selective External Cavity Laser Using an InAs Quantum Dot Gain Chip and a Planar Lightwave Circuit for T-band WDM Communications” Conference report was uploaded.
2017/04/03: F.Nakamura (M1) presented her research at ECIO2017 on”1 × 2 Wavefront Control Type Wavelength-Selective Switch by Silicon Waveguides”Conference report was uploaded
2017/03/23: Fumi Nakamura (B4) won Electrical academic women's activities encouragement award 2017 of the Institute of Electrical Engineers of Japan (IEEJ). Certificate of achievement was uploaded.
2016/10/17: T.Inaba (M1) presented his research at FiO 2016 on”Focusing grating coupler for integration of a liquid-crystal spatial light modulator onto a Si photonic circuit”Conference report was uploaded
2016/10/17: Y.Okuno (B4) presented his research at FiO 2016 on”Wavelength Selective External Cavity Laser Using an InAs Quantum Dot Gain Chip and an Arrayed-Waveguide Grating for T-band Optical Communication” Conference report was uploaded
2016/10/17: S.Sakai (B4) presented his research at FiO 2016 on”Low-loss and low-crosstalk Si polarization splitters with two-step etching” Conference report was uploaded
2016/10/17: F.Nakamura (B4) presented her research at FiO 2016 on”Design of a Wavefront Control Type Compact Silicon Wavelength Selective Switch” Conference report was uploaded
2013/09/23: H.Asakura (D3) presented his research at PS 2015 on "A 200-GHz Spacing, 17-Channel, 1x2 Wavelength Selective Switch using a Silicon Arrayed-Waveguide Grating with Loopback" Conference report was uploaded
2013/09/23: H.Asakura (D3) presented his research at PS 2015 on "A 200-GHz Spacing, 17-Channel, 1x2 Wavelength Selective Switch using a Silicon Arrayed-Waveguide Grating with Loopback" Conference report was uploaded
2013/09/23: K.Muramatsu (M2) presented his research at PS 2015 on "A Wavefront Control Type Compact Silicon Wavelength Selective Switch" Conference report was uploaded
2013/09/23: K.Kato (M1) presented his research at PS 2015 on "Design of a Current-Driven Optical 2x2 Switch using Phase-Change Material" Conference report was uploaded
2013/08/26: K.Kato (M1) presented his research at CLEO-PR 2015 on "Design of a Current-Driven Optical Gate Switch using a Si waveguide and Phase-Change Material" Conference report was uploaded
2013/06/28: K.Sugiyama (M1) presented his research at IPR 2015 on "Broadband 2x2 Multimode Interference Coupler for T- and O-band Communication by Wavefront Matching Method"Conference report was uploaded
2014/07/14: H.Asakura(D2) presented his research at ECIO-MOC 2014 on "Loss Uniformity Improvement of Arrayed-waveguide Grating Router using Interleaved Chirped Array". Conference report was uploaded
2014/03/11: T.Moriyama(M1) presented his research at OFC 2014 on "Small-sized Mach-Zehnder Interferometer Optical Switch Using Thin Film Ge₂Sb₂Te₅ Phase-change Material". Conference report was uploaded
2013/10/27: H.Asakura(D1) presented his research at MOC 2013 on "High-Speed, Hybrid Integrated, 1x2 Wavelength Selective Switch Using PLZT Optical Switches and Silica Planar Lightwave Circuits"Conference reportwas uploaded
2013/10/27: K.Sorimoto(D3) presented his research at MOC 2013 on "Compact 5 × 5 Wavelength-selective Cross Connect using Integrated 2-D "
2013/10/27: Nazirul Afham(D1) presented his research at MOC 2013 on "Silica planar lightwave circuit collimator with UV-cured resin as integrated multilayered lenses" Conference reportwas uploaded
2013/09/22: T.Yoshida(M2) presented his research at ECOC 2013 on"Silica-Based 100-GHz-Spacing Integrated 40-λ 1×4 Wavelength Selective Switch"
2013/07/16: T. Moriyama (M1) presented his research at IPR 2013 on "Low Crosstalk Design of an Optical Matrix Switch Using Phase-Change Material". Conference reportwas uploaded.
2013/07/01: T. Yoshida (M2) presented his research at CLEO-PR&OECC/PS 2013 on "Proposal for an Integrated 40-λ 1×4 Wavelength Selective Switch". Conference reportwas uploaded.
2013/07/01: H. Asakura (D1) presented his research at CLEO-PR&OECC/PS 2013 on "Crosstalk Reduction of a PLZT Arrayed-Waveguide Grating by Phase Error Compensation". Conference reportwas uploaded.
2013/04/04: Updated Achievements page.
2013/04/04: Updated Members page.
2013/03/07: T. Ikeda (M2) presented his research at SPIE Photonics West 2013 on "Optical spectrum control circuit with flat pass band characteristics using a high-resolution arrayed-waveguide grating". Conference reportwas uploaded.
2012/12/05: Paridhi Jain (M2) won the Poster Award at the symposium "Phase Change Oriented Science (PCOS2012)" for her study on "Mach Zehnder Interferometer Optical Switch Using Phase-Change Material"
2012/10/12: D. Tanaka (D3), H. Asakura (M2), and P. Jain (M1) presented their research at international conference "PS2012". Conference report was uploaded.
2012/07/23: T. Yoshida(M1) has presented his research on IPR2012.Conference report was uploaded.