Point diffraction optical fiber circulator

The invention relates to a point diffraction optical fiber circulator, which comprises a first end, a second end, a third end and a light splitting structure, and is configured as follows: under the condition that preset detection light is received through the first end, the preset detection light is reflected twice in the light splitting structure and is sent to a detected object through the second end; under the condition that the preset detection light is sent to the detected object, first reflected light reflected by the detected object is received through the second end, the first reflected light is orthogonal to the polarization state of the preset detection light, and the first reflected light comprises vibration amplitude information representing the first polarization state of the detected object; and under the condition that the second end receives the first reflected light, the first reflected light is reflected to the third end through primary transmission in the light splitting structure. 本公开涉及一种