PROTECTING STRUCTURE AND PROTECTING METHOD OF OPTICAL FIBER COUPLER

摘要

PURPOSE:To provide a protecting structure capable of firmly fixing an optical fiber coupler to a case and significantly reducing the stress added to a crude fiber part. CONSTITUTION:A protecting case 6 is formed of a case base plate 6a having a thermal expansion ratio equal to that of an optical fiber, and a case cap body 6b having a substantially U-shaped cross section orthogonal to the longitudinal direction and a groove 7. An optical fiber coupler G having a crude fiber part 1b and a covered part 1a is housed in the protecting case 6. The parts not fused nor drawn on both end parts of the crude fiber part 1b are directly fused to projection parts 8 integrally provided on the case base plate 6a. These fused parts are covered with an adhesive 9.