Optical fiber circulator with all ports on same side

The invention discloses an optical fiber circulator with all ports on the same side. A shell is included; a first crystal, a first wave plate, a second wave plate, a permanent magnet, a Faraday rotator, a second crystal, a third wave plate and a total reflective mirror are arranged in the shell; three optical fiber collimators are installed on a side wall of one side of the shell; the first crystal is arranged on one side of the optical fiber collimator; the first wave plate and the second wave plate are arranged at one end of the first crystal; and one side of the first wave plate and one side of the second wave plate are in contact with each other, the same Faraday rotator is arranged on one sides, away from the first crystal, of the first wave plate and the second wave plate, the permanent magnets fixed to the inner walls of the two sides of the shell are arranged on the two sides of the Faraday rotator, and the second crystal is arranged on the side, away from the first crystal, ofthe Faraday rotator. All