Tail fiber

The embodiment of the utility model provides a tail fiber, which is used for improving the fiber insertion success rate and the product yield of an optical fiber fixer. The optical fiber fixer provided by the embodiment of the utility model is used for fixing the optical fiber. The optical fiber fixer comprises a main body structure, and the main body structure is made of a single target material. The center of the main body structure is provided with an optical fiber hole, a guide hole and a bare fiber hole which are sequentially communicated. The first aperture of the optical fiber hole is larger than the diameter of the optical fiber. The bare fiber hole is a cylindrical hole, and the second aperture of the bare fiber hole is larger than the diameter of the bare fiber in the optical fiber. The inner wall of the first end of the guide hole is communicated with the inner wall of the optical fiber hole, the inner wall of the second end of the guide hole is communicated with the inner wall of the bare fiber hole, and the aperture of the guide hole is gradually reduced from the first end to the second end.