Patent ID: 6886998

Claim:
An optical fiber fusion splicing method, comprising: a process of fusion-splicing end faces of two optical fibers together to form a fusion spliced part; and a process of arc-heating the fusion spliced part continuously with one pair of electrodes while moving said one pair of electrodes at least in a longitudinal direction of the fiber, said one pair of electrodes being provided opposite to each other across the fusion spliced part, and said process of arc-heating being performed with an operation for decreasing arc temperature, wherein said operation for decreasing arc temperature is to add a modulation to an electric discharge current such that a maximum value becomes equal to or more than an electric current for starting arc discharge and a minimum value becomes more than zero and less than the electric current for starting arc discharge, wherein said modulation is achieved by a square wave whose frequency ranges from 10 Hz to 20 MHz.