Suppression of back-reflected TE modes in TM-mode optical isolator employing nonreciprocal phase shift

摘要

A waveguide optical isolator can be constructed by use of a nonreciprocal phase shift which occurs in TM modes traveling in magneto-optic waveguides. The device includes an optical interferometer that is composed of a nonreciprocal phase shifter and a reciprocal phase shifter, leading to constructive interference in the forward traveling waves and destructive interference in the backward traveling waves. Suppression of back-reflected TE modes is discussed in the TM-mode optical isolator employing the nonreciprocal phase shift.