Updated on 2026/06/22

写真a

 
WATANABE Toshio
 
Organization
Research Field in Engineering, Science and Engineering Area Graduate School of Science and Engineering (Engineering) Department of Engineering Electrical and Electronics Engineering Program Associate Professor
Title
Associate Professor
Degree
(2001.2 Tokyo Institute of Technology)

Research Interests

  • Optical Switching

  • Lightwave Engineering

  • Photonic Network System

Education

  • 1990.4 - 1992.3    Tokyo Institute of Technology

Research History

  • 2020.4    Kagoshima University   Research Field in Engineering, Science and Engineering Area Graduate School of Science and Engineering (Engineering) Department of Engineering Electrical and Electronics Engineering Program   Associate Professor

  • 2016.1 - 2020.3    Kagoshima University   Research Field in Engineering, Science and Engineering Area Graduate School of Science and Engineering (Engineering) Electrical and Electronics Engineering Course   Associate Professor

  • 2010.4 - 2015.9    Yokohama National University

  • 2007.10 - 2010.3    Meiji University

Professional Memberships

  • 2017.10    Optica, formerly The Optical Society

  • 2011.7    電子情報通信学会

  • 1997.7    The Institute of Electrical and Electronics Engineers

  • 1993.6    応用物理学会

  • 1991.8    日本物理学会

Committee Memberships

  • 2021.6 - 2022.6    電子情報通信学会   英文論文誌C編集委員会　英文論文誌編集委員長   Academic society

  • 2019.6 - 2021.6    電子情報通信学会   英文論文誌C編集委員会　英文論文誌編集幹事   Academic society

  • 2016.5 - 2018.4    応用物理学会   講演会企画運営委員   Academic society

Qualification acquired

  • Hazardous Material Handler (first kind)

  • Organic Solvent Work Chief Person

  • Specified Chemical Substances Work Chief

 

Papers

  • T. Watanabe, D. Ishio, T. Nagayama, S. Fukushima .  3-stage Mach-Zehnder Interferometer Optical Switch with Ripple-free Response .  MOC 2025 - Technical Digest of the 30th Microoptics Conference   2025.10Reviewed

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：MOC 2025 Technical Digest of the 30th Microoptics Conference  

    We address an optimal coupling ratio of 3-stage Mach-Zehnder interferometer optical switch, which gives ripple-free response as a function of applied phase between arms.

    DOI： 10.23919/MOC65514.2025.11269215

    Scopus

  • T. Watanabe, H. Nakamura, T. Nagayama, S. Fukushima .  Perfect Crossbar Optical Switch with Imperfect Couplers .  OECC/PSC 2025 - Technical Digest of the 30th OptoElectronics and Communications Conference / International Conference on Photonics in Switching and Computing 2025 ( 2025 )   2025.6Reviewed

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Opto Electronics and Communications Conference Oecc  

    We propose a perfect crossbar optical switch based on cascaded Mach-Zehnder interferometers, which gives no crosstalk at both cross and bar states even if the power ratio of the couplers deviates from 50:50.

    DOI： 10.23919/OECC/PSC62146.2025.11110739

    Scopus

  • Nagayama T., Mori J., Fukushima S., Watanabe T. .  Constitutive Method for Electromagnetic Negative Refractive Index Lenses Using a Two-Dimensional Meander Microstrip-Line Unit Cell Structure .  2025 Photonics and Electromagnetics Research Symposium Spring PIERS Spring 2025 Proceedings   2025Reviewed

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：2025 Photonics and Electromagnetics Research Symposium Spring Piers Spring 2025 Proceedings  

    The constitutive method for electromagnetic negative refractive index (NRI) lenses is presented. A two-dimensional meander microstrip-line unit cell structure is proposed and the structural parameters are determined from the theoretical formulas. The theoretical frequency dispersion characteristics are also calculated and are compared with those by eigenvalue analysis. An NRI lens is constituted by periodically arranging the designed unit cell structure and the focusing operation is demonstrated with full-wave simulation.

    DOI： 10.1109/PIERS-Spring66516.2025.11276362

    Scopus

  • Toyomitsu S., Nagayama T., Fukushima S., Watanabe T. .  Two Types of Composite T-/π-Type Rhombic Unit Cell Structures for Topological Waveguides .  Asia Pacific Microwave Conference Proceedings APMC   2025Reviewed

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Asia Pacific Microwave Conference Proceedings APMC  

    Two types of composite T-/π-type rhombic unit cell structures are presented for the design of topological waveguides. These are structures composing of T-/π-type circuits and have gaps on either of those, and their periodicities are mutually shifted by half-period so that the frequency dispersion characteristics and bandgaps are identical. The characteristics are shown from the results of the eigenvalue analysis. A topological waveguide is constituted using the proposed unit cell structures, and the operations at microwave frequencies are validated by calculating the electric field distributions with the full-wave simulations. The results indicate the concentration of the electric field on the topological waveguide.

    DOI： 10.1109/APMC65046.2025.11378974

    Scopus

  • Nishtake T., Nakamura K., Naka R., Fukushima S., Nagayama T., Watanabe T., Kikuchi H. .  Design of a Multi-Focal Fresnel Lens Employing Liquid Crystal Loaded Metasurface .  MOC 2025 Technical Digest of the 2025 30th Microoptics Conference   2025Reviewed

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Moc 2025 Technical Digest of the 2025 30th Microoptics Conference  

    We applied our previous study of liquid crystal loaded metasurface (LC-MS) to a multi-focus Fresnel lens. A LC-MS Fresnel lens was proposed to realize multi-focal points and focal length variability. This paper reports its design method, simulation results, and discussion.

    DOI： 10.23919/MOC65514.2025.11269281

    Scopus

  • Toyomitsu S., Nagayama T., Fukushima S., Watanabe T. .  Design of a Topological Waveguide Using Two Types of Rhombic Unit Cell Structures Mutually Shifted by Half-Period .  Asia Pacific Microwave Conference Proceedings APMC   268 - 270   2024Reviewed

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Asia Pacific Microwave Conference Proceedings APMC  

    Two types of rhombic unit cell structures mutually shifted by half-period are proposed for the design of topological waveguides. The frequency dispersion characteristics are calculated with eigenvalue analysis and it is confirmed that the proposed unit cell structures have the same frequency bandgap. A topological waveguide is constituted by periodically arranging the proposed unit cell structures and the operation is verified with full-wave simulations to confirm the validity of the design.

    DOI： 10.1109/APMC60911.2024.10867690

    Scopus

  • Suhara I., Nagayama T., Fukushima S., Watanabe T. .  Design of a Broadband Flat Metasurface Lens by Using One-Dimensional Meander Microstrip-Line Structures .  2023 Photonics and Electromagnetics Research Symposium PIERS 2023 Proceedings   1899 - 1904   2023Reviewed

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：2023 Photonics and Electromagnetics Research Symposium Piers 2023 Proceedings  

    We design a broadband flat metasurface lens whose thickness is much thinner than the wavelength. The concept with one-dimensional (1-D) transmission-line model is recalled and 1-D meander microstrip-line structures are used for the design. Determining the specification of the lens, the line length is calculated based on the design formula. The eigenfrequency analysis is carried out to modify the error of electrical length from the theoretical value, and the line length is optimized. A metasurface lens is constituted with the structures and full-wave simulations are performed to confirm the broadband operation. It is seen from the results that the designed lens can make a focus at any frequency.

    DOI： 10.1109/PIERS59004.2023.10221359

    Scopus

  • Kashiwaki T., Fukushima S., Watanabe T., Nagayama T. .  Spatial Distribution Observation of Sonoluminescence from Acoustic Cavitation Bubbles in Electric-Field-Applied Water .  28th Microoptics Conference MOC 2023   2023

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    Language：Japanese   Publisher：28th Microoptics Conference Moc 2023  

    We have observed spatial distribution of sonoluminescence from acoustic cavitation bubbles in electric-field-Applied water by using a commercial digital camera. Luminescence included two colors of bluish white and reddish orange and had a column shape. Luminescent characteristics changed when an electric field was applied to the water.

    DOI： 10.23919/MOC58607.2023.10302916

    Scopus

  • Teshima T., Fukushima S., Nagayama T., Watanabe T., Kikuchi H. .  Light Beam Steering Demonstration by Using Liquid Crystal Loaded Metasurface .  2023 Photonics and Electromagnetics Research Symposium PIERS 2023 Proceedings   1895 - 1898   2023Reviewed

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：2023 Photonics and Electromagnetics Research Symposium Piers 2023 Proceedings  

    We proposed two types of LC-loaded metasurface devices having a simple cuboid and a cuboid with a chevron-waveguide structure as a unit cell and showed simulation results on light beam steering. According to the results, it has been confirmed numerically that the light steers at the metasurface devices and its angle can be controlled by change of refractive index. By employing the cuboid with a chevron-waveguide structure, the same steering angle was achieved at lower refractive index change.

    DOI： 10.1109/PIERS59004.2023.10221529

    Scopus

  • Nakagawa T., Nagayama T., Fukushima S., Watanabe T. .  Constitution Method for Broadband Acoustic Metamaterials Based on the Design Theory of a One-Dimensional Distributed Transmission-Line Model .  Crystals12 ( 11 )   2022.11Reviewed

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Crystals  

    A method for realizing broadband acoustic metasurfaces composed of a one-dimensional distributed transmission-line model is proposed. There are no design formulas for determining the structural parameters of the structure constituting acoustic metasurfaces in the conventional method, and therefore parameter extractions by means of many calculations with numerical simulations are needed to realize acoustic metasurfaces. There are also narrow band operations or impedance matching problems. On the other hand, this paper shows that we can design broadband acoustic metasurfaces by determining the structural parameters with the design formulas of the model without many calculations. An acoustic metasurface that refracts incident plane waves at an angle of 20 degrees is first designed by using one-dimensional meander acoustic waveguide structures equivalent to the model, and these structural parameters are determined by the design formulas of the model and the modifications of the error from the theory. Full-wave simulations are performed, and the broadband operations and the validity of the design theory are shown from these results. Furthermore, a broadband acoustic flat lens is designed with the proposed structures as an example of the application of the proposed method, and these operations are also demonstrated by similar full-wave simulations.

    DOI： 10.3390/cryst12111528

    Scopus

  • Nagayama T., Toshima A., Fukushima S., Watanabe T. .  Two-Dimensional Distributed Transmission-Line Models for Broadband Full-Tensor Anisotropic Acoustic Metamaterials Based on Transformation Acoustics .  Crystals12 ( 11 )   2022.11Reviewed

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Crystals  

    We propose the design method for broadband acoustic metamaterials based on the concept of transformation acoustics. Two-dimensional distributed transmission-line (TL) models for full-tensor anisotropic electromagnetic metamaterials are applied to full-tensor anisotropic acoustic metamaterials and the design formulas are shown to uniquely determine the structural parameters of the unit cells. Two-dimensional acoustic waveguide unit cell structures for realizing the TL models are proposed and an acoustic carpet cloak and an acoustic illusion medium are designed according to the introduced theory. The complex sound pressure distributions in the acoustic waveguides of the unit cells are calculated by full-wave simulations to verify the validity of the proposed method, and the broadband operations of the designed carpet cloak and illusion medium are confirmed from the results.

    DOI： 10.3390/cryst12111557

    Scopus

  • Takegami I., Nagayama T., Fukushima S., Watanabe T. .  Design Method of Acoustic Metamaterials for Negative Refractive Index Acoustic Lenses Based on the Transmission-Line Theory .  Crystals12 ( 11 )   2022.11Reviewed

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Crystals  

    The design theory for electromagnetic metamaterials with negative refractive indices by using a distributed transmission-line model is introduced to the design of acoustic metamaterials, and a negative refractive index (NRI) acoustic lens is designed theoretically. Adjustments to the negative refractive indices of metamaterials have been carried out by calculations with numerical simulators in conventional design methods. As the results show, many calculations are needed to determine the shape of the unit structures and there are issues in that it is difficult to design those rigorously, meaning that limitations regarding the degree of freedom in the designs are many. On the other hand, the transmission-line model can rigorously design the unit cell structures of both the negative refractive index metamaterials and the background media with the positive refractive indices by calculations with the design formulas and modifying the error from the theory with a small calculation. In this paper, a meander acoustic waveguide unit cell structure is proposed in order to realize a structure with characteristics equivalent to the model, and the waveguide width and length for realizing an NRI acoustic lens are determined from the design formula of the model. The frequency dispersion characteristics of the proposed structure are also computed by eigenvalue analysis and the error in the waveguide length from the theoretical value is modified by a minor adjustment of the waveguide length. In addition, the NRI acoustic lens is constituted by periodically arranging the proposed unit cell structure with the calculated parameters, and the full-wave simulations are carried out to show the validity of the design theory. The results show that the designed lens operates at 2.5 kHz.

    DOI： 10.3390/cryst12111655

    Scopus

  • M. Kawasako, T. Watanabe, T. Nagayama, S. Fukushima .  Scalability of multi-stage nested Mach-Zehnder interferometer optical switch with phase generating couplers .  Advances in Science, Technology and Engineering Systems Journal7 ( 4 ) 140 - 146   2022.8Reviewed

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.25046/aj070418

  • D. Kiritoshi, T. Watanabe, T. Nagayama, S. Fukushima .  Coupling Characteristics of a Mode Multi/Demultiplexer with a Vertically Stacked Asymmetric Directional Coupler .  OECC/PSC 2022 - Technical Digest of the 27th OptoElectronics and Communications Conference / International Conference on Photonics in Switching and Computing 2022   2022.7Reviewed

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：OECC/PSC 2022 - 27th OptoElectronics and Communications Conference/International Conference on Photonics in Switching and Computing 2022  

    We show the coupling characteristics of a mode multi/demultiplexer (MUX/DEMUX) with a vertically stacked asymmetric directional coupler. Designed multilayer 4-mode MUX/DEMUX has higher coupling efficiency than the conventional in-plane mode MUX/DEMUX.

    DOI： 10.23919/OECC/PSC53152.2022.9849938

    Scopus

  • Sonoda Y., Nagayama T., Watanabe T., Fukushima S. .  Design of a Broadband Carpet Cloak for Hiding Larger Objects than the Wavelength by Using One-Dimensional Meander Microstrip-Line Structures .  Asia Pacific Microwave Conference Proceedings APMC2022-November   76 - 78   2022Reviewed

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Asia Pacific Microwave Conference Proceedings APMC  

    Four types of one-dimensional (1-D) meander microstrip-line structures are proposed in order to realize 1-D distributed transmission-line models for the design of carpet cloaks that can hide larger objects than the wavelength. The line length of the proposed structures is determined based on the design theory of the model and a carpet cloak for hiding periodically arranged large triangle areas on a flat surface is designed by using the proposed structures. Full-wave simulations are performed, and the broadband operations and the validity of the design are demonstrated from the calculated results.

    Scopus

  • Suhara I., Nagayama T., Watanabe T., Fukushima S. .  Implementation Method for Broadband Metasurfaces Based on a Distributed Transmission-Line Model .  Proceedings 2022 RFM IEEE International RF and Microwave Conference RFM 2022   2022Reviewed

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Proceedings 2022 Rfm IEEE International RF and Microwave Conference Rfm 2022  

    We propose an implementation method for broadband metasurfaces based on a one-dimensional distributed transmission-line model. Five types of one-dimensional meander microstrip-line structures are proposed and a metasurface refracting a normal incident plane wave with a 20-degree angle is implemented with those. Line length of each structure is determined from the theoretical formula of the model and the error from the theoretical value is modified by eigenfrequency analysis. Full-wave simulations are carried out, and the broadband refracting operations and the validity of the proposed method are confirmed.

    DOI： 10.1109/RFM56185.2022.10065054

    Scopus

  • M. Kawasako, T. Watanabe, T. Nagayama, S. Fukushima .  4-Stage Mach-Zehnder Interferometer Optical Switch with Phase Generating Couplers .  MOC 2021 - Technical Diget of the 26th Microoptics Conference   2021.9Reviewed

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：26th Microoptics Conference, MOC 2021  

    We examine the characteristics of a 4-stage nested Mach-Zehnder interferometer optical switch with phase generating couplers, and demonstrate that crosstalk is suppressed to less than -40 dB over 200nm wavelength range from 1450 to 1650 nm by choosing six ports among 16 output ports.

    DOI： 10.23919/MOC52031.2021.9598066

    Scopus

  • K. Sainohira, T. Watanabe, T. Nagayama, S. Fukushima .  Truncated spot size converters for silicon photonic wire waveguides .  OECC 2021 - Technical Digest of the 26th Optoelectronics and Communications Conference   2021.7Reviewed

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Optics InfoBase Conference Papers  

    We examined light propagation along the spot size converter of silicon photonic wire waveguides, and show there are two maxima in coupling efficiency. An optimal design was given in terms of compactness and high efficiency by changing its dimension and shape.

    Scopus

  • Toshima A., Nagayama T., Fukushima S., Watanabe T. .  Acoustic Illusion Medium Mimicking Scattered Waves of a Groove on a Flat Surface Based on Transformation Acoustics .  Progress in Electromagnetics Research Symposium2021-November   2587 - 2592   2021Reviewed

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Progress in Electromagnetics Research Symposium  

    An acoustic illusion medium for mimicking a groove on a flat surface is designed by using the equivalent circuit models for full-tensor anisotropic acoustic metamaterials. The concept is explained according to the theory of transformation acoustics and its circuit parameters are calculated from the design formulas. The mimicking operations of the normal and the oblique incidence cases are shown by circuit simulations with a SPICE simulator to confirm the validity of the design theory. In addition, the radar cross sections (RCSs) are compared with those of the groove to evaluate the operations.

    DOI： 10.1109/PIERS53385.2021.9694828

    Scopus

  • 永山 務, 福島 誠治, 渡邉 俊夫 .  分布定数線路モデルと等価な単位セル構造による透明マントのための屈折率0媒質の設計 .  電子情報通信学会論文誌J104-C   33 - 42   2021Reviewed

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    Language：Japanese   Publishing type：Research paper (scientific journal)  

    CiNii Research

  • Nagayama T., Toshima A., Sonoda Y., Fukushima S., Watanabe T. .  Design of a Broadband Carpet Cloak by Using an One-Dimensional Distributed Transmission-Line Model .  Asia Pacific Microwave Conference Proceedings APMC2021-November   353 - 355   2021Reviewed

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Asia Pacific Microwave Conference Proceedings APMC  

    We propose a novel design method for broadband carpet cloaks that can hide objects whose size is larger than the wavelength. A non-resonant one-dimensional distributed transmission-line model is introduced to the design and a carpet cloak for hiding periodically arranged triangle large objects is designed by determining the line length and the characteristic impedance based on the theory. The broadband operations for the cases with the normal and the oblique incidences are confirmed by circuit simulations with a SPICE simulator.

    DOI： 10.1109/APMC52720.2021.9661681

    Scopus

  • Nagayama T., Fukushima S., Watanabe T. .  Design Method of Broadband Flat Metasurface Lenses by Using an One-Dimensional Distributed Transmission-Line Model .  2021 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting APS URSI 2021 Proceedings   403 - 404   2021Reviewed

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：2021 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting Aps Ursi 2021 Proceedings  

    We propose a design method for broadband flat metasurface lenses by using an one-dimensional distributed transmission-line model. The design formula of the line length is shown and how to determine the characteristic impedance is stated. Circuit simulations are carried out to confirm the validity of the design method and broadband operations of a designed flat metasurface lens are demonstrated.

    DOI： 10.1109/APS/URSI47566.2021.9704148

    Scopus

  • K. Tasaki, M. Tokumaru, T. Watanabe, T. Nagayama, S. Fukushima .  Nested Mach-Zehnder interferometer optical switch with phase generating couplers .  Japanese Journal of Applied Physics59 ( SO ) SOOB04   2020.8Reviewed

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japanese Journal of Applied Physics  

    DOI： 10.35848/1347-4065/ab8f09

    Scopus

  • T. Watanabe, K. Tasaki, T. Nagayama, S. Fukushima .  Nested Mach-Zehnder Interferometer Optical Switch with Low Crosstalk .  MOC 2019 - Technical Digest of the 24th Microoptics Conference   234 - 235   2019.11Reviewed

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：MOC 2019 - 24th Microoptics Conference  

    DOI： 10.23919/MOC46630.2019.8982851

    Scopus

  • S. Shimada, T. Watanabe, T. Nagayama, S. Fukushima .  Design of arrayed-waveguide optical switch employing window function for crosstalk reduction .  Japanese Journal of Applied Physics58 ( SJ ) SJJB03   2019.8Reviewed

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Japanese Journal of Applied Physics  

    DOI： 10.7567/1347-4065/ab27b1

    Scopus

  • W. Yamauchi, T. Watanabe, T. Nagayama, S. Fukushima .  Joint-Switching Architecture Utilizing Waveguide-Based Multicast Switch in CDC-ROADM for Multi-Core Fiber Networks .  OECC/PSC 2019 - Technical Digest of the 24th OptoElectronics and Communications Conference / International Conference Photonics in Switching and Computing 2019   2019.7Reviewed

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    Authorship：Corresponding author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：OECC/PSC 2019 - 24th OptoElectronics and Communications Conference/International Conference Photonics in Switching and Computing 2019  

    DOI： 10.23919/PS.2019.8817853

    Scopus

  • T. Watanabe, S. Sohma, S. Kamei .  Low-loss wavelength routing optical switch consisting of small matrix switch and cyclic arrayed-waveguide gratings for colorless add/drop .  Japanese Journal of Applied Physics53 ( 8S2 ) 08MB02   2014.7Reviewed

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

  • 渡辺　俊夫 .  電気光学および熱光学効果型光制御機能を有するポリマー導波路に関する研究 .      2001.2

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    Language：Japanese   Publishing type：Doctoral thesis  

  • T. Watanabe, F. Kano, S. Kuwano, H. Suzuki, M. Koga .  Scale expansion of transparent photonic transport network based on distributed Raman amplification .  IEEE Photonics Technology Letters12 ( 10 ) 1420 - 1422   2000.10Reviewed

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

  • T. Watanabe, N. Sakaida, H. Yasaka, F. Kano, M. Koga .  Transmission performance of chirp-controlled signal using semiconductor optical amplifier .  Journal of Lightwave Technology18 ( 8 ) 1069 - 1077   2000.8Reviewed

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

  • T. Watanabe, S. Hayashida, S. Imamura .  Vibrational overtone absorption of side chain in silicone at 1.55 um wavelength band .  Japanese Journal of Applied Physics38 ( 3B ) L318 - L319   1999.3Reviewed

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

  • T. Watanabe, H. Yasaka, N. Sakaida, M. Koga .  Waveform shaping of chirp-controlled signal by semiconductor optical amplifier using Mach-Zehnder frequency discriminator .  IEEE Photonics Technology Letters10 ( 10 ) 1422 - 1424   1998.10Reviewed

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

  • T. Watanabe, N. Sakaida, H. Yasaka, M. Koga .  Chirp control of optical signal using phase modulation in semiconductor optical amplifier .  IEEE Photonics Technology Letters10 ( 7 ) 1027 - 1029   1998.7Reviewed

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

  • T. Watanabe, N. Ooba, S. Hayashida, T. Kurihara, S. Imamura .  Polymeric optical waveguide circuits formed using silicone resin .  Journal of Lightwave Technology16 ( 6 ) 1049 - 1055   1998.6Reviewed

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

  • T. Watanabe, N. Ooba, Y. Hida, M. Hikita .  Influence of humidity on refractive index of polymers for optical waveguide and its temperature dependence .  Applied Physics Letters72 ( 13 ) 1533 - 1535   1998.3Reviewed

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

  • T. Watanabe, M. Hikita, M. Amano, Y. Shuto, S. Tomaru .  Vertically stacked coupler and serially grafted waveguide: Hybrid waveguide structures formed using an electro-optic polymer .  Journal of Applied Physics83 ( 2 ) 639 - 649   1998.1Reviewed

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

  • T. Watanabe, N. Ooba, Y. Hida, S. Hayashida, T. Kurihara, S. Imamura .  Digital thermooptic switch formed using silicone resin waveguides .  Japanese Journal of Applied Physics36 ( 12B ) L1672 - L1674   1997.12Reviewed

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

  • T. Watanabe, Y. Inoue, A. Kaneko, N. Ooba, T. Kurihara .  Polymeric arrayed-waveguide grating multiplexer with a wide tuning range .  Electronics Letters33 ( 18 ) 1547 - 1548   1997.8Reviewed

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

  • T. Watanabe, M. Amano, S. Tomaru .  Second-order optical nonlinearities of an electrooptic polymer containing a thiazole ring and its use in single-mode waveguide fabrication .  Japanese Journal of Applied Physics33 ( 12A ) L1683 - L1685   1994.12Reviewed

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

  • T. Watanabe, M. Amano, M. Hikita, Y. Shuto, S. Tomaru .  Novel 'serially grafted' connection between functional and passive polymer waveguides .  Applied Physics Letters65 ( 10 ) 1205 - 1207   1994.9Reviewed

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

  • T. Watanabe, T. Kubo, K. Ishikawa, H. Takezoe, A. Fukuda .  Multiphonon Raman scattering enhanced by resonance with band gap Ag luminescence state in trans-polyacetylene .  Japanese Journal of Applied Physics33 ( 1A ) L48 - L51   1994.1Reviewed

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

  • T. Watanabe, T. Kubo, H. Takezoe, A. Fukuda .  Luminescence and multiphonon Raman scattering excited at exciton-forming vibronic absorption subbands in trans-polyacetylene .  Japanese Journal of Applied Physics31 ( 2A ) L102 - L105   1992.2Reviewed

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

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Presentations

  • 渡邉俊夫, 石尾泰知, 永山務, 福島誠治   3段縦続MZI光スイッチの応答歪みの抑制  

    第73回応用物理学会春季学術講演会  2026.3 

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    Event date： 2026.3

    Language：Japanese   Presentation type：Poster presentation  

    Venue：東京科学大学  

  • 中村広和, 渡邉俊夫, 永山務, 福島誠治   縦続接続したMZI光スイッチのクロストーク特性  

    電子情報通信学会OCS/OPE/LQE研究会  2025.10 

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    Event date： 2025.10

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：熊本  

  • 田中駿丞, 渡邉俊夫, 永山務, 福島誠治   少数モード光ファイバと光導波路間の低モード依存・高効率接続  

    第78回電気・情報関係学会九州支部連合大会  2025.9 

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    Event date： 2025.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：福岡工業大学   Country：Japan  

  • 立山健登, 渡邉俊夫, 永山務, 福島誠治   少数大口径の空孔を用いた屈折率導波型光ファイバの特性  

    第78回電気・情報関係学会九州支部連合大会  2025.9 

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    Event date： 2025.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：福岡工業大学   Country：Japan  

  • 中村広和, 渡邉俊夫, 永山務, 福島誠治   点対称に縦続接続したMZI光スイッチの動作特性  

    第86回応用物理学会秋季学術講演会  2025.9 

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    Event date： 2025.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：名城大学  

  • 渡邉俊夫, 田口峻輔, 永山務, 福島誠治   縦続MZI型光スイッチの時間応答特性  

    電子情報通信学会総合大会  2025.3  電子情報通信学会

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    Event date： 2025.3

    Language：Japanese  

    Venue：東京都市大学  

  • 張卓, 渡邉俊夫, 永山務, 福島誠治   1+8コア光ファイバーのクロストーク特性  

    令和6年度電気学会九州支部沖縄支所講演会  2024.12  電気学会九州支部

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    Event date： 2024.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：琉球大学  

  • T. Watanabe, S. Taguchi, T. Nagayama, S. Fukushima   Rising time reduction by cascading Mach-Zehnder interferometer optical switches   International conference

    29th Microoptics Conference (MOC 2024)  2024.10 

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    Event date： 2024.9 - 2024.10

    Language：English   Presentation type：Poster presentation  

    Venue：Kaohsiung  

  • 山本啓太, 渡邉俊夫, 永山務, 福島誠治   不等間隔のアレイ導波路を用いた光スイッチ  

    第77回電気・情報関係学会九州支部連合大会  2024.9 

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    Event date： 2024.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：鹿児島大学   Country：Japan  

  • 井芹奎士郎, 稲光遥也, 渡邉俊夫, 永山務, 福島誠治   中空コアフォトニックバンドギャップファイバの群遅延特性  

    電子情報通信学会OCS/OFT/CMN/BCT研究会  2023.11 

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    Event date： 2023.11

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：京都  

  • 鍵本力, 渡邉俊夫, 永山務, 福島誠治   積層型非対称方向性結合器を用いたモード合分波器  

    第76回電気・情報関係学会九州支部連合大会  2023.9 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：崇城大学   Country：Japan  

  • 小田昇輝, 渡邉俊夫, 永山務, 福島誠治   マルチモード伝送可能な屈折率導波型フォトニック結晶ファイバ  

    第76回電気・情報関係学会九州支部連合大会  2023.9 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：崇城大学   Country：Japan  

  • 井芹奎士郎, 渡邉俊夫, 永山務, 福島誠治   中空コア光ファイバの群遅延特性  

    第76回電気・情報関係学会九州支部連合大会  2023.9 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：崇城大学   Country：Japan  

  • 稲光遥也, 渡邉俊夫, 永山務, 福島誠治   屈折率を制御したフォトニック結晶ファイバの特性  

    第76回電気・情報関係学会九州支部連合大会  2023.9 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：崇城大学   Country：Japan  

  • 永山諒, 渡邉俊夫, 永山務, 福島誠治   冗長性を持つ3段Clos光スイッチの回路構成  

    第76回電気・情報関係学会九州支部連合大会  2023.9 

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    Event date： 2023.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：崇城大学   Country：Japan  

  • 樋渡裕次郎, 渡邉俊夫, 永山務, 福島誠治   スラブ導波路を交差させたアレイ導波路回折格子の回路構成  

    第75回電気・情報関係学会九州支部連合大会  2022.9 

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    Event date： 2022.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • 郡山博樹, 渡邉俊夫, 永山務, 福島誠治   光回路を用いたベクトル-行列演算器におけるクロストークの影響  

    令和3年度電気学会九州支部沖縄支所講演会  2021.12  電気学会九州支部

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    Event date： 2021.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン  

  • 川迫雅之, 渡邉俊夫, 永山務, 福島誠治   複合干渉計型光スイッチの多ポート化の構成  

    2021.11  電子情報通信学会

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    Event date： 2021.11

    Language：Japanese   Presentation type：Poster presentation  

    Venue：オンライン  

  • 下山優人, 渡邉俊夫, 永山務, 福島誠治   光パワー分配比がカイザー窓関数にしたがうアレイ導波路型光スイッチの設計  

    第74回電気・情報関係学会九州支部連合大会  2021.9 

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    Event date： 2021.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • 渡邉俊夫   光通信ネットワーク用光スイッチの設計技術   Invited

    レーザー学会学術講演会第41回年次大会  2021.1  レーザー学会

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    Event date： 2021.1

    Language：Japanese  

    Venue：オンライン  

  • 池田捷記, 渡邉俊夫, 永山務, 福島誠治   分布ラマン増幅を用いた光ファイバ伝送の雑音特性  

    令和2年度電気学会九州支部沖縄支所講演会  2020.12  電気学会九州支部

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    Event date： 2020.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン  

  • 切通大智, 渡邉俊夫, 永山務, 福島誠治   同一材料を用いた位相・光軸角度が波長無依存の1/4波長板  

    第73回電気・情報関係学会九州支部連合大会  2020.9 

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    Event date： 2020.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：オンライン   Country：Japan  

  • 田崎公平, 渡邉俊夫, 永山務, 福島誠治   位相生成カプラを線対称に配置した複合干渉計型光スイッチ  

    第67回応用物理学会春季学術講演会 

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    Event date： 2020.3

    Language：Japanese   Presentation type：Poster presentation  

  • 渡邉俊夫   光ネットワークの進化の鍵を握る光デバイス研究の最新動向   Invited

    電子情報通信学会CS/OCS研究会  2020.1 

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    Event date： 2020.1

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

    Venue：別府  

  • 齊之平晃樹, 渡邉俊夫, 永山務, 福島誠治   テーパ型光導波路スポットサイズコンバータの光パワー伝播特性  

    第72回電気・情報関係学会九州支部連合大会  2019.9 

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    Event date： 2019.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：九州工業大学  

  • 渡邉俊夫, 嶋田周平, 永山務, 福島誠治   アレイ光導波路型光スイッチにおけるクロストークの計算方法  

    第80回応用物理学会秋季学術講演会  2019.9 

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    Event date： 2019.9

    Language：Japanese   Presentation type：Poster presentation  

    Venue：北海道大学  

  • 渡邉俊夫, 山内航, 永山務, 福島誠治   マルチコアファイバ対応CDC-ROADMのジョイントスイッチ構成  

    電子情報通信学会ソサイエティ大会  2019.9 

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    Event date： 2019.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：大阪大学  

  • 嶋田周平, 渡邉俊夫, 永山務, 福島誠治   窓関数を用いたアレイ光導波路型光スイッチのクロストーク低減  

    第66回応用物理学会春季学術講演会  2019.3 

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    Event date： 2019.3

    Language：Japanese   Presentation type：Poster presentation  

    Venue：東京工業大学  

  • S. Shimada, T. Watanabe, T. Nagayama, S. Fukushima   Design of arrayed-waveguide optical switch employing window function   International conference

    23rd Microoptics Conference (MOC 2018)  2018.10 

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    Event date： 2018.10

    Language：English   Presentation type：Poster presentation  

    Venue：Taipei  

  • 田崎公平, 渡邉俊夫, 永山務, 福島誠治   複合マッハ-ツェンダ干渉計型1×N光スイッチのクロストーク特性  

    第71回電気・情報関係学会九州支部連合大会  2018.9 

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    Event date： 2018.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：大分大学  

  • W. Yamauchi, T. Watanabe, T. Nagayama, S. Fukushima   Temporal response difference between thermo-optic switch and variable optical attenuator  

    電気情報通信学会光エレクトロニクス研究会 

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    Event date： 2017.12

    Language：English   Presentation type：Poster presentation  

    Venue：宮古島  

  • S. Shimada, T. Watanabe, T. Nagayama, S. Fukushima   Arrayed-waveguide optical switch with low crosstalk  

    電気情報通信学会光エレクトロニクス研究会 

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    Event date： 2017.12

    Language：English   Presentation type：Poster presentation  

    Venue：宮古島  

  • 嶋田周平, 渡邉俊夫, 永山務, 福島誠治   アレイ光導波路を用いた光スイッチのクロストーク低減  

    第70回電気・情報関係学会九州支部連合大会  2017.9 

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    Event date： 2017.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：琉球大学  

  • 山内航, 渡邉俊夫, 永山務, 福島誠治   熱光学効果を用いた可変光減衰器の時間応答  

    第70回電気・情報関係学会九州支部連合大会  2017.9 

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    Event date： 2017.9

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：琉球大学  

▼display all

Awards

  • OECC/PS 2016 Best Paper Award

    2016.7   21st Optoelectronics and Communications Conference / International Conference on Photonics in Switching 2016  

    T. Watanabe, K. Sato, K. Ueda, Y. Mori, H. Hasegawa, H. Matsuura, K. Ishii, H. Kuwatsuka, S. Namiki

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    Award type：Award from international society, conference, symposium, etc.  Country：Japan

  • 17th Microoptics Conference Paper Award

    2011.11   Microoptics Conference  

    T. Watanabe, Y. Hashizume, and H. Takahashi

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    Award type：Award from international society, conference, symposium, etc.  Country：Japan

  • 応用物理学会　講演奨励賞

    1997.7   応用物理学会  

    渡辺　俊夫

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    Award type：Award from Japanese society, conference, symposium, etc.  Country：Japan

Research Projects

  • 導波路型光スイッチの高性能化・大規模化の研究

    2018.4 - 2021.3

    科学研究費補助金  基盤研究(C)

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    Authorship：Principal investigator 

 

Social Activities

  • 第4回テックガーデンサロン

    Role(s)： Lecturer

    蔵前工業会　鹿児島県支部  スイッチ！　～明治150年と光ファイバー50年の雑学談義～  2017.12

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    Audience： University students,　Graduate students,　General public

    Type：Lecture

  • 鹿児島大学公開講座

    Role(s)： Lecturer

    情報通信社会を支える光ファイバーのしくみ  2016.07

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    Audience： Junior high school students,　High school students,　University students,　Graduate students,　General public

    Type：Lecture