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Koyama Lab
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The lab develops photonic integrated devices for optical communications and sensing, built around vertical-cavity surface-emitting lasers.
AboutAbout the lab
Vertical-cavity surface-emitting lasers for optical communications and sensing.
The Koyama Lab studies photonic integrated devices for optical communication networks and sensing systems.
At the center of its work is the vertical-cavity surface-emitting laser (VCSEL), which emits light vertically from the surface of a semiconductor.
The lab has worked on putting VCSELs to practical use, improving their performance, and applying them to optical communications and sensing.
The lab forms a research group with the Uenohara Lab and the Miyamoto Lab, and shares laboratories and experimental equipment as needed.
Key terms
- Vertical-cavity surface-emitting laser (VCSEL)
- A semiconductor laser that emits light perpendicular to the surface of a device made of stacked thin semiconductor layers
- Photonic integrated device
- A device in which optical components, such as lasers and optical waveguides, are built together on a small chip
- Sensing
- Measuring or detecting information such as distance and shape using light or other means
NewsLab news
Won the Best Contributed Paper Award at ISLC2026
Project Professor Koyama received the title of Distinguished Professor from Institute of Science Tokyo
Project Professor Koyama and colleagues have been selected to receive the Japan Academy Prize
Researchers won the MOC Paper Award at MOC2025
ResearchResearch themes
The lab is pioneering photonic integrated devices for optical communication networks and sensing systems. Recently, its papers on single-mode VCSELs with metal apertures and on arrays of them have received awards at international conferences.
*Illustrative imageVCSELs That Speed Up Data Centers
Data centers exchange enormous amounts of data using light. This research uses small vertical-cavity surface-emitting lasers (VCSELs), which emit light from the surface of the substrate, to transmit high-speed signals of 100-200 gigabits per second per channel without cooling.
*Illustrative image1060 nm Lasers That Reach Farther
The lab fabricates 1060 nm-band VCSELs that use a tiny metal aperture to make the light single-mode, and has confirmed that they can send high-speed signals several kilometers over ordinary optical fiber. It is also working on arrays of many such lasers.
*Illustrative imageSteering Light Without Moving Parts
3D sensors for autonomous driving and other uses need to change the direction of light quickly. The lab studies devices that steer light without moving parts, using arrays of VCSELs with a slow-light structure in which light travels slowly.
MembersFaculty
The Koyama Lab members consist of faculty and researchers.As of 2026
- Project ProfessorFumio KoyamaPublications ↗
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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: “Laser table” Pawel Nowakowski / CC BY-SA 4.0 (cropped)
- VCSELs That Speed Up Data Centers: “VCSELimage” Kenichi Iga / CC BY-SA 4.0 (cropped)
- 1060 nm Lasers That Reach Farther: “Structure diagram of a VCSEL” Kenichi Iga / CC BY-SA 4.0 (cropped)
- Steering Light Without Moving Parts: “Ouster OS1-64 lidar point cloud of intersection of Folsom and Dore St, San Francisco” Daniel L. Lu / CC BY 4.0 (cropped)
- Related lab (Shoji Lab): “Optical patchcord” Sunmosk / CC BY 4.0 (cropped)
- Related lab (Nakagawa Lab): “Mechanical delay stage in an optical setup 01” Aksy88 / CC BY-SA 4.0 (cropped)
- Related lab (Nishiyama Lab): “Laser diode chip” NASA
（PD NASA。 作者欄なし） / Public domain (cropped) - Related lab (Kajikawa Lab): “Metamaterial 'Flat Lens' ( )” National Institute of Standards and Technology / Public domain (cropped)
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