Method for fusion splicing optical fibers

摘要

In a method for fusing splicing optical fibers having different diameters of fiber coating portions (15a,15b), the fiber coating portions of optical fibers to be spliced are clamped on V-groove boards (17a,17b) and end faces of the optical fibers are aligned. Then, the end faces of the optical fibers are fused spliced by a discharged heating. An inclination angle &thetas;g of glass fibers of the fusion spliced optical fibers is measured from an observed image of the image pick-up screen (18) of a fusion splicing portion (14) after fusion splicing the optical fibers to estimate a splice loss of the optical fibers. The splice loss between the optical fibers of the same kind is estimated by measuring the misalignment d and the splicing angle offset &thetas;f and calculating the estimated loss " alpha =F(d,&thetas;f)". This estimated loss alpha has a predetermined correlation with the actual measured loss, and can be used for the estimation of spliced loss without any specific problems.