Method for optical fiber fusion splicing

A method for optical fiber fusion splicing, wherein an optical fiber (10) to be fused comprises a fiber core (11), a cladding layer (12) and a coating layer (13) in order from the inside to the outside in a radial direction, the diameter of the cladding layer (12) is D1, the diameter of the coating layer (13) is D2, and the method comprises the following steps:

• coating layer stripping:
• cutting the coating layer at a preset stripping length of the optical fiber (10) to be fused, to form a slit (14) with a depth t between (0, (D2-D1)/2);
• immersing the optical fiber (10) to be fused in a softening liquid to soften the coating layer (13) after the slit (14) is formed, wherein the slit (14) is flush with the highest level of the softening liquid;
• after immersing for a predetermined time, taking out the optical fiber (10) to be fused and applying an acting force in an axial direction of the optical fiber (10) to be fused, to strip the softened coating layer (13) to expose the cladding layer (12);
• fiber cutting:
• cutting an end of the optical fiber (10) to be fused after stripping the coating layer (13) to obtain a fusion end face;
• fiber fusion:
• fusing two fusion end faces obtained in sequence through the coating layer stripping and fiber cutting steps;
• and
• fusion point coating:
• sleeving a fusion point with a light-transmitting tube (41), filling the light-transmitting tube (41) with coating glue and then implementing a vacuum process to the light-transmitting tube, and irradiating the light-transmitting tube (41) with an ultraviolet lamp to solidify the coating glue in the light-transmitting tube (41).