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Ultrafast Optical Communication [Hirooka-Kasai] Lab
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A lab that studies ultrafast, high-efficiency optical communication.
AboutAbout the lab
Carrying ever-growing amounts of data efficiently with optical communication.
The Ultrafast Optical Communication Lab studies ultrafast, high-efficiency optical communication technologies for efficiently carrying ever-growing amounts of data.
The lab works on optical time-division multiplexing, which shifts and stacks very short light pulses in time, and on digital coherent optical communication, which applies wireless communication methods to optical communication.
With new communication services such as 5G and Beyond 5G in view, the lab also aims to develop a new field that fuses optical and wireless communication as the same electromagnetic waves.
The lab also works on stabilizing lasers for communication and on using them to measure earthquakes and tsunamis.
Key terms
- Optical time-division multiplexing
- A method that arranges very short light pulses side by side, shifted in time, to carry many signals on a single beam of light.
- QAM
- Quadrature amplitude modulation. A modulation method that carries information in combinations of the amplitude and phase of light or radio waves.
- Digital coherent optical communication
- A communication method in which the receiver detects the amplitude and phase of light and extracts the signal through digital signal processing.
ResearchResearch themes
The data flowing through networks is expected to keep growing with the spread of high-definition video distribution and IoT. To carry this growing traffic efficiently, the lab conducts research and development on ultrafast, high-efficiency optical transmission technologies.
*Illustrative imageUltrafast, High-Efficiency Optical Transmission and Signal Processing
The lab studies optical time-division multiplexing transmission, which multiplexes sub-picosecond ultrashort optical pulses in the time domain. Using a waveform shaping technique called optical Nyquist pulses, it has succeeded in transmission at 10.2 Tbit/s over 300 km.
*Illustrative imageDigital Coherent Optical Communication and Optical-Wireless Convergence
The lab applies QAM and OFDM, which are wireless communication technologies, to optical communication to raise spectral efficiency by more than 10 times. It has achieved 4096-QAM transmission and aims to build access networks for Beyond 5G that fuse optical and wireless communication.
*Illustrative imageUltra-Stable Lasers and Applications to Optical Measurement
The lab studies pulsed lasers whose phase and repetition frequency are stabilized simultaneously, and lasers whose frequency is stabilized using acetylene molecules. Taking advantage of their high coherence, it also works on applications to high-precision measurement, such as optical frequency standards, seismometers, and tsunami gauges.
MembersFaculty
The members of the Hirooka-Kasai Lab are faculty and students in the doctoral, master's, and undergraduate programs.
- ProfessorToshihiko Hirooka
- Associate ProfessorKeisuke Kasai
VoicesStudent voices
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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: “SC-APC fiber optic cable” Alexceltare2 / CC BY-SA 4.0 (cropped)
- Ultrafast, High-Efficiency Optical Transmission and Signal Processing: “Optical fiber cable-07ASD” Asurnipal / CC BY-SA 4.0 (cropped)
- Digital Coherent Optical Communication and Optical-Wireless Convergence: “base station and antenna by Wireless City Planning” Yoh-Plus / CC BY 4.0 (cropped)
- Ultra-Stable Lasers and Applications to Optical Measurement: “Ti Sapphire laser TIS-SF-07” Sergey100 / Public domain (cropped)
- Related lab (Innovative Spintronics Device Lab): “Unisys SCAMP die” Pauli Rautakorpi / CC BY 3.0 (cropped)
- Related lab (Advanced Wireless Communication Technology [Suematsu] Lab): “Erdfunkstelle Raisting 2” Richard Bartz, Munich aka Makro Freak / CC BY-SA 2.5 (cropped)
- Related lab (Systems and Control Engineering (Sugita) Lab): “Optical Therapeutics and Medical Nanophotonics Laboratory ( )” The U.S. Food and Drug Administration / Public domain (cropped)
- Related lab (Communication Systems [Nishiyama] Lab): “Cellular tower-3” Wikideas1 / CC0 (cropped)
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