Abstract
This paper describes tensile performances of the optical fiber with a fracture origin. Three kinds of blade（steel round blade，steel flat blade，and diamond blade）are used make a fracture origin. Tensile tests of optical fiber with a fracture origin are carried out not only in air but also in water, salt water，ethyl alcohol, water glass，and machine oil，using a vertical tensile tester. Tensile speed is set to be 0.1，0.5，and 1.0 mm/min., respectively. It is found that the tensile strength distributions of optical fibers with fracture origins show Weibull distributions，and average value of tensile strength and shape parameter mon Weibull distribution have different values depending on used blade kinds. It is also clarified that tensile strengths decrease when optical fibers are cleaved in water，saltwater, and water glass while they increase in ethyl alcohol, and machine oil. Mirror end surfaces are easily obtained by making tensile strength low.
