Research Institute of Electrical Communication Tohoku University


Hiroshi Yasaka,Professor

Masato Yoshida,Associate Professor

Nobuhide Yokota,Assistant Professor

( From left )Masato Yoshida, Hiroshi Yasaka,
Nobuhide Yokota


Research Activities

We are investigating novel, highly functional semiconductor photonic devices and laser light sources, which is indispensable to realize new generation optical information communication network systems. Furthermore, our research interests cover ultrafast photonic devices including laser sources, opto-electronic semiconductor devices and their applications to optical computing and signal processing areas.

Laboratory Web Page

ECEI Web Page

Highly Functional Photonics(Prof. Yasaka)

We have been studying highly functional semiconductor photonic devices and semiconductor photonic integrated circuits based on semiconductor lasers and semiconductor optical modulators to create novel semiconductor photonic devices, which can control intensity, phase, frequency and polarization of optical signal freely. Furthermore we research novel semiconductor photonic functional devices based on novel principle to realize innovative photonic information communication network systems.

Research topics

  • Ultra-high speed control of semiconductor photonic devices by signal light injection
  • Highly functional semiconductor light sources
  • Highly functional semiconductor optical modulators
  • Novel functional semiconductor photonic integrated circuits


High accuracy optical measurement(Assoc. Prof. Yoshida)

We are engaged in the development of frequency stabilized laser operated at 1.55 µm and its application to high accuracy optical measurements. Furthermore, we are developing ultra-short pulse lasers.

Research topics

  • Frequency stabilized lasers and their application to high accuracy optical measurements
  • Ultrashort mode-locked lasers and their application to frequency standards and microwave-photonics

Schematic structure of spin modulation VCSEL
Calculated response of the VCSEL for current and spin polarization modulation.
(γp: linear birefringence)