Abstract

A concept of an integrated optical isolator is presented which uses the TM0 mode propagating perpendicular to the in-plane the magnetization of a planar magnetooptical waveguide. The cut-off thickness of the waveguide depends on the propagation direction. If the magnetic film has a strong Faraday rotation and is weakly guiding, the cut-off thicknesses for forward and backward propagation differ markedly. Operating close to cut-off yields a large difference between coupling efficiencies to the waveguide for forward and backward propagation.

© 1990 Optical Society of America

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