Efficient heating groove for optical-fiber fusion splicer and optical-fiber fusion splicer

A heating groove for optical fiber fusion splicer, comprising;

• a heat substrate of said heating groove which is a metal sheet with heat conducting property, wherein an outer surface of the heat substrate includes sequentially printed elements from thick film screen printing, said sequentially printed elements including an insulating medium, at least one heating resistor, a transition point conductor, and a protection glass glaze on the outer surface of the heating substrate ;
• wherein, said at least one heating resistor includes two heating resistors, each with a resistance of 4.7±0.5Ω and power density of 10-20 W/cm2, which are separately printed on the outer face of two heating surfaces in the heating groove;
• said heating resistor is made of resistive material with a temperature coefficient of 1500±150 ppm/° C.;
• the resistance of said heating resistor distributes in the way that, the resistance at two ends is larger than that at center, and the resistance is reduced gradually or by step, from two ends to the center.