Abstract: The present invention discloses an optical fiber fusion splicer which, together with fusing and splicing optical fibers in the state in which the jacket of each optical fiber core is clamped by being provided with a means by which a V-shaped groove base is moved up and down so that the axial centers of optical fiber cores are positioned at the proper position for electrical discharge, is provided with a mechanism that temporarily moves clamp upward and V-shaped groove base downward followed by re-clamping in order to eliminate a lift-up phenomenon during rotation alignment of the constant polarization optical fibers.

Abstract: The object of the present invention is to provide an optical fiber fusion splice method in which two optical fibers having different mode field diameters are fusion spliced with a low splice loss without complicated words and special equipment other than a fusion splice device, and an optical fiber fusion splicer which is suitably used for the optical fiber fusion method; in order to achieve the object, the present invention provides an optical fiber fusion splice method for splicing two optical fibers having different mode field diameters comprising the steps of: arranging a first optical fiber having a small mode field diameter and a second optical fiber having a large mode field diameter so that the cut surfaces thereof face each other, heating by an electric discharge and fusion splicing the cut surfaces, shifting the heating position by an electric discharge in the first optical fiber by shifting integrally the first and second optical fibers in the longitudinal direction of the optical fibers, and addit

Abstract: The present invention discloses an optical fiber fusion splicer which, together with fusing and splicing optical fibers in the state in which the jacket of each optical fiber core is clamped by being provided with a means by which a V-shaped groove base is moved up and down so that the axial centers of optical fiber cores are positioned at the proper position for electrical discharge, is provided with a mechanism that temporarily moves clamp upward and V-shaped groove base downward followed by re-clamping in order to eliminate a lift-up phenomenon during rotation alignment of the constant polarization optical fibers.

Abstract: The object of the present invention is to provide a method of accurately calibrating discharge heat energy produced during fusion splicing of two optical fibers by heating the optical fibers arranged with the intentional fiber cladding axes offset; in order to achieve the object, the present invention provides a method of calibrating discharge heat energy used in the optical fiber fusion splicing device wherein a discharge heating energy is measured based on a change of the fiber cladding axes offset.