Abstract: An apparatus, method, system, and computer-program product for magneto-optic (MO) switching produces magneto-optic materials in blue and green light wavelengths. An MO switching apparatus includes a first waveguide supporting a propagation of a radiation signal from a first port to a second port; a second waveguide including a second port; and a ring-oscillator having a closed propagation pathway including magneto-optic materials, said ring-oscillator operationally coupled to said waveguides and responsive to a controlling influence to switch between a first mode and a second mode, with said first mode substantially non-interfering with said propagation of said radiation signal in said first waveguide and with said second mode routing said propagation of said radiation signal from said first port to said second port.