A new optical component: Nonreciprocal three-way divider based on magneto-optical resonator

We suggest and analyze a new compact nonreciprocal optical component based on a magneto-optical resonator. This component fulfills simultaneously two functions, namely, equal division of the input signal between three output ports and isolation of the input port from output ones. Using group theory, we analyze the scattering matrix of this symmetrical component. Our numerical results for one of the possible schemes of the divider based on 2D photonic crystal with magneto-optical material demonstrate that at the central frequency, the division of the signal between the three output ports is about -5.4 dB. The variation of the division levels in the output ports in this band is (-5.4 ± 0.4) dB. For the level -20 dB of the isolation, the calculated bandwidth is around 190 GHz at the wavelength 1.55 μm.