High contrast all-optical diode based on direction-dependent optical bistability within asymmetric ring cavity

Xia Xiu-Wen^{1, 2, †,}, Zhang Xin-Qin¹, Xu Jing-Ping², Yang Ya-Ping²

Schematic diagram of an asymmetric ring resonator. The electric fields E_in, E_r, E_t are defined on the mirrors 1 and 2. Arrows show directions of propagation. The gray shadow is the saturable absorber in the cavity with length l.