Recent progress on integrated magneto-optical isolators

Optical isolator is indispensable for establishing stable photonic systems by eliminating backward reflections. We have investigated waveguide optical isolators for photonic integrated circuits using magneto-optical (MO) effects. There are two challenges; difficulty in integration method of MO crystal and difficulty in Faraday rotation in planar waveguide systems. In this talk, recent progress of the integrated MO isolators is reviewed.