January 20, 2010


IEEE Photonic Society Distinguished Lecture

ECE Department Seminar


Tetsuya Mizumoto  

Tokyo Institute of Technology, Tokyo, Japan


1/20/2010 - Wednesday

4:00-5:00 pm


Sinclair Auditorium

(Refreshment will be provided at 3:45pm)

Optical nonreciprocal devices for photonic integrated circuits

Optical nonreciprocal devices, i.e. isolators and circulators, provide unique functions of transmitting lightwave only in one direction. An isolator protects an optical active device from unwanted reflections, and a circulator enables one to build a functional circuitry like an add-drop multiplexer. This talk provides an overview of optical nonreciprocal devices, especially focusing on the application to photonic integrated circuits.

The talk presents an introduction to bulk type optical isolators and circulators for better understanding of nonreciprocal functions. It is followed by an overview of waveguide nonreciprocal devices, which include mode conversions, nonreciprocal phase shift and nonreciprocal loss mechanism. All of these mechanisms are provided by magneto-optic materials. When one considers to integrate the nonreciprocal devices with optical active devices, it is necessary to implement these materials on compound semiconductor platforms. We developed a direct bonding technique to overcome this issue. In the last part, a non-magnetooptic approach will be touched upon.


Tetsuya Mizumoto received the Dr. Eng. degree in electrical engineering from Tokyo Institute of Technology in 1984. He was promoted to an Associate Professor and a Professor in 1987 and 2004, respectively, at Tokyo Institute of Technology.  His research has been mainly concerned with waveguide optical devices, especially magneto-optic nonreciprocal devices. He measured the optical nonreciprocal phase shift in a magneto-optic garnet waveguide for the first time. Dr. Mizumoto received the Treatise Award in 1994 and the Best Letter Award of Electronics Society Transactions in 2007, from the Institute of Electronics, Information and Communication Engineers (IEICE).