The high power polarization insensitive in-line fiber isolator is a passive magneo-optical component that only allows light to be transmmited in a single direction. Taking advantage of the non-reciprocity of the Faraday rotating crystal, it can effectively suppress the reflected light generated from the distance fiber end and the connector end face from returning to the light source, thereby preventing the light source from being adversely affected by the reflected light and improving the stability of the system. JFOTP adopts high quality components to guarantee its stable performance for the passage of high-power light sources.