OPTICAL FIBER COUPLER AND MANUFACTURE THEREOF

摘要

PURPOSE:To improve the insertion loss temperature characteristic of the optical fiber coupler and to fix a coupler element to a fixed plate stably for a long period. CONSTITUTION:The manufacturing method is described below. (1) The lengthwise halfway jackets of plural coated optical fibers are peeled to specific length to expose optical fibers. (2) Preliminary soldering is performed at both ends of the optical fibers. (3) Preliminary soldering is performed at specific parts of both ends of the fixed plate 4. (4) The center parts in the sections between the preliminarily solder zones of the fibers are spliced by fusion and drawn to form the coupler element 3. (5) The coupler element 3 is soldered onto the fixed plate 4 by using a non-ultrasonic wave vibration type soldering iron. (6) The coupler element 3 and fixed plate 4 which are soldered to each other are put in a cylindrical case 6, the fixed plate 4 is adhered to the case internal wall, and the optical fibers are led out of both end openings of the case. (7) Both end openings of the cylindrical case 6 are sealed with sealants.