Method for calibrating discharge heat energy of optical fiber splicing device

A method of calibrating discharge heat energy used in an optical fiber fusion splicing device wherein a discharge heating energy is measured based on a change of the fiber cladding axes offset that is produced intentionally with a fiber aligning mechanism, comprising:

• abutting the two optical fibers with fiber cladding axes dislocated;
• performing discharge heating so as to produce a first fused joint exhibiting a residual axes offset;
• and
• subjecting the first fused joint to a series of successive additional discharge heating steps while the each discharge heat energy is measured at additional discharge heating processes from a change of the fiber cladding axes offset due to additional discharge heating,
• wherein a fusion spliced joint having a fiber cladding axes offset is heated on one fused joint additionally and successively under a plurality of levels of discharge heat energy so as to measure the axes offset after each additional heating to obtain a calibrating function of the plurality of levels of discharge heat energy and discharge current in one calibration cycle.