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Information Networks Lab
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A lab researching high-capacity optical fiber networks to support ever-growing communication traffic.
AboutAbout the lab
Meeting growing traffic smartly with light.
The Hasegawa Lab studies the high-capacity optical fiber networks that the next generation will need.
With the use of video, social media, and the cloud, the volume of traffic flowing through optical fiber networks is growing rapidly.
The lab tackles this surging traffic from both the network perspective and the system and device perspective.
Its work spans network control, equipment that switches signals while keeping them in optical form, signal processing in transceivers, and physical phenomena inside optical fibers.
Key terms
- Wavelength division multiplexing
- A technology that sends multiple optical signals of different colors (wavelengths) together through a single optical fiber
- Digital signal processing
- Converting signals into numerical values and processing them by computation. Here, it means correcting distortions in received signals by computation
- Nonlinear optical effects
- A phenomenon in which intense light changes the properties of a material, so that the way light propagates depends on its intensity
NewsLab news
A master's student received the IEICE Tokai Section Student Research Encouragement Award
A master's student received the APN 2026 Student Award at the IEICE APN Workshop 2026
A master's student received the IEEE Nagoya Section International Conference Research Presentation Award
A master's student received the PN Student Encouragement Award and the Presentation Award at the IEICE Technical Committee on Photonic Networks
ResearchResearch themes
As the information and communication society develops, the capacity of traffic flowing through optical fiber networks is growing exponentially. The lab works on a range of challenges toward realizing the high-capacity optical fiber networks that the next generation will need.
*Illustrative imageControl of optical networks
To make effective use of the limited frequency bandwidth with wavelength division multiplexing, the lab devises control algorithms that take into account constraints specific to optical fiber networks. In recent years, it has also been evaluating control methods based on machine learning.
*Illustrative imageEquipment that switches signals in the optical domain
The lab studies optical routing equipment that switches signal paths while keeping signals optical, without converting them to electrical signals. It has proposed and demonstrated optical nodes with new architectures and high-capacity optical switching equipment that can switch large volumes of traffic with low power consumption.
*Illustrative imageSignal processing in optical transceivers
The lab uses digital signal processing inside transceivers to deal with every factor that degrades signal quality, such as instability of lasers and of optical and electrical components, and waveform degradation during transmission through optical fiber.
*Illustrative imagePhysical phenomena in optical fibers
In long-distance optical fiber communication, nonlinear optical effects distort signal waveforms and limit capacity and distance. The lab aims to understand optical phenomena inside the fiber and to clarify the limits of transmission capacity and distance.
MembersFaculty
The members of the Hasegawa Lab consist of faculty, secretaries, and master's and undergraduate students.As of 2026
- ProfessorHiroshi Hasegawa
- Assistant ProfessorTakuma Kuno
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Optical fibre distribution cabinet Finland closeup” Antti Leppänen / CC BY 4.0 (cropped)
- Control of optical networks: “Telecommunications technician” U.S. Department of Agriculture Lance Cheung/Multimedia PhotoJournalist / Public domain (cropped)
- Equipment that switches signals in the optical domain: “Optical switch - DARPA Quantum Network, in the BBN laboratory - IMG 2681” Daderot / CC0 (cropped)
- Signal processing in optical transceivers: “SFP board 2” Christophe.Finot / CC BY-SA 3.0 (cropped)
- Physical phenomena in optical fibers: “Optical fiber cable-07ASD” Asurnipal / CC BY-SA 4.0 (cropped)
- Related lab (Wireless Communication Systems Lab): “Heilbronn - Heilbronner Berge - Schweinsberg - Fernmeldeturm - Ansicht vom Schweinsbergturm (1)” Roman Eisele / CC BY-SA 4.0 (cropped)
- Related lab (Quantum Integrated Devices and Systems Lab): “Superconducting Metamaterial Chip 003” OJB Quantum / CC BY 4.0 (cropped)
- Related lab (Nano Electronic Devices Lab): “Hukseflux flexible heat flux sensor FHF04 with incorporated temperature sensor” Hukseflux TS / CC BY-SA 4.0 (cropped)
- Related lab (Advanced Information Environment Lab): “SmartTotem” Bolondkamion / CC BY-SA 4.0 (cropped)
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