High-isolation circulator core

The utility model relates to a high-isolation circulator core which comprises a first polarization splitting prism, an optical rotation mechanism, a second polarization splitting prism and a crawling prism which are arranged in sequence. A crawling prism, a first polarization splitting prism, an optical rotation mechanism and a second polarization splitting prism are paired and combined to form an optical circulator core with a compact structure, and the optical circulator core can realize that an optical signal input from an input port can be transmitted to a corresponding output port. The signal light reversely input from the corresponding output port does not reach the corresponding input port and is output from other ports, so that suppression and isolation of the signal light are realized, and the optical signal can be transmitted according to the transmission function of the circulator. According to the utility model, the isolation difference of different channels is also realized, the isolation is ensu