Researcher Database

（Last updated : 2025-04-16 17:08:06）　

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TAKIGUCHI Koichi

Department / Course College of Science and Engineering Department of Electrical and Electronic Engineering

Title / Position Professor

Other Affiliations
1.	Graduate School of Science and Engineering

Academic background
1.	1989/04～1992/03	Doctorial Course │ Department of Electrical Engineering │ Graduate School of Engineering │ The University of Tokyo │ Completed Ph.D.
2.	1987/04～1989/03	Master Course │ Department of Electrical Engineering │ Graduate School of Engineering │ The University of Tokyo │ Completed
3.	1983/04～1987/03	Department of Electronic Engineering │ Faculty of Engineering │ The University of Tokyo │ Graduated

Committee and society
1.	2024/06 ～ 2025/02	The IEEE History Committee, IEEE Milestone Program Expert Reviewer for the Milestone Proposal: Silica-Based Arrayed-Waveguide Gratings, 1992-1996
2.	2022/07/14 ～ 2023/11	IEICE Transactions on Electronics, Joint Special Section on Opto-electronics and Communications for Future Optical Network Guest Associate Editors
3.	2010/12 ～ 2023/01	IEEE Photonics Technology Letters (PTL) Associate Editor

Research activities
1.		The Institute of Electrical and Electronics Engineers (IEEE)
2.		OPTICA (Formerly OSA)
3.		The International Society for Optical Engineering
4.		The Institute of Electronics, Information and Communication Engineers (IEICE)
5.		The Japan Society of Applied Physics (JSAP)

Subject of research
1.	Research on Integrated-photonic Functional Device
2.	Research on Optical Signal Processing
3.	Research on Optical Sensing
4.	Research on THz-wave Wireless Communication and Sensing Utilizing Photonics
5.	Research on Photonic Computing

Research summary
Optical signal processing and integrated-optic device technologies and their application to communications, sensing, wireless communication in THz-band, and photonic computing Progress in capacity enlargement of optical communication technologies has continued to bring various benefits to our lives, such as the broadbandization of the internet. However, existing signal processing in electronic circuits face problems in limitation of speed, increase in power consumption, etc. Studies progress for various optical filters and optical signal processing technologies to be used in optical waveguides and optical fibers, using diffraction, interference, and non-linear optical effects that enable light to be processed as much as possible in the form of light as it is, with their high velocity and low power consumption characteristics. In addition, another is the soft probe aspect of light, which is gentle to living bodies and environment as well as being highly sensitive. By combining these features with optical signal processing technology, research is being made also for high-sensitivity optical sensing technology and for multiplexing of optical sensors (sensor fusion) mainly in biotechnology, medical, and environmental areas. Recently, we have started the research on wireless communication in the THz-band and photonic computing. The THz-wave communication is expected to contribute to the realization of the 6G mobile communication system.

Present specialized field
Applied Optics/Quantum Optical Engineering, Electronic materials/ Electric materials, Electron device/ Electronic equipment, Communication/ Network engineering, Measurement Engineering (Keyword：Optoelectronics, Optical Communication, Optical Metrology, Information Photonics, Optical Signal Processing, Integrated-photonic Functional Device, Optical Waveguide, THz-wave Photonics, Photonic Computing)

Books
1.	1989/09	Optical fiber sensors, Bias of an optical passive ring-resonator gyro due to the misalignment of the polarization axis in the resonator formed by the polarization-maintaining fiber │ ,pp.94-100

Papers
1.	2024/03/10	Mode group division multiplexing communication with the use of graded-index plastic optical fiber │ IEICE Electronics Express │ 21 (5),pp.20230472-1-20230472-4
2.	2023/12	Integrated-optic chromatic dispersion compensator with completely passive operation and wide operational bandwidth │ OPTICA Optics Continuum │ 2 (12),pp.2529-2539
3.	2022/08	Pulse amplitude modulation wireless communication in 300 GHz-band employing integrated-optic interferometer-based signal emulator │ OPTICA Optics Continuum │ 1 (8),pp.1741-1751
4.	2022/03	Direct demultiplexing method of terahertz-wave multiple carrier channels in terahertz domain utilizing terahertz-wave asymmetric interferometer │ SPIE Proceedings │ 12000,pp.120000O-1-120000O-5
5.	2022/03	Pulse amplitude modulation communication in terahertz-band using asymmetric Mach-Zehnder interferometer-type optical signal emulator │ SPIE Proceedings │ 12000,pp.120000D-1-120000D-5
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Academic conference presentation
1.	2025/07	TBD (Invited talk)
2.	2025/03/28	Optical exclusive OR circuit for processing multi-input signals
3.	2025/03/27	Preliminary investigation into encryption of wireless communication signal in terahertz band using optical XOR circuit
4.	2025/02/20	Research on demultiplexing method of spectrally efficient multi-carrier signals using direct signal processing in THz-band
5.	2025/01/29	Security enhancement of terahertz-band communication using optical exclusive OR circuit
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Winning science prize
1.	2022/11	The Institute of Electrical and Electronics Engineers (IEEE) IEEE Photonics Technology Letters, Associate Editor Service Award
2.	2019/06	The Institute of Electronics, Information and Communication Engineers (IEICE) Best Paper Award (Demultiplexing method of variable capacity optical OFDM signal using time lens-based optical Fourier transform)
3.	2014/03	The Institute of Electronics, Information and Communication Engineers (IEICE) Electronics Society Activity Testimonial
4.	2011/03	The Institute of Electronics, Information and Communication Engineers (IEICE) Electronics Society Activity Testimonial
5.	1997/10	The Institution of Electrical Engineers (IEE) Electronics Letters, Premium Award (1 Tbit/s (100 Gbit/s x 10 channel) OTDM/WDM transmission using a single supercontinuum WDM source)

Acquisition patent
1.		Dispersion slope equalizer （第1094625号）
2.		Dispersion slope equalizer （第1689101号）
3.		CDMA encoder-decoder, CDMA communication system, WDM-CDMA communication system （第2330185号）
4.		CDMA encoder-decoder, CDMA communication system, WDM-CDMA communication system （第1710938号）
5.		Optical pulse pattern generator （第2415564号）
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Home Page
https://www.photoniccomputing.jp/en/member/
https://www.photoniccomputing.jp/en/member/index.php?actList=01#actType04

E-Mail Address

researchmap Researcher code
7000006085