| 摘要 |
PURPOSE:To suppress the fluctuation of branching ratios and the characteristics of excess loss and to suppress the fluctuation in characteristics after thermal impact test by adhering the front and rear of an optical coupling part to protective members by an adhesive having a prescribed viscosity. CONSTITUTION:Screw rods and guide rods are removed from the chassis of the device while the fused and stretched fibers of optical fibers 1, 2 are held butted in clamps. The fused and stretched fibers are held between two sheets of the protective members 17 which are quartz plate. The front and rear of the optical coupling part 11 are then adhered by the adhesive 16 of an epoxy resin of a UV curing type (one pack type or two pack type). The fused and stretched fibers of two pieces of the optical fibers 1, 2 are adhered and fixed by using the adhesive 16 having 1000 to 50000cps viscosity at 20 deg.C. The clamps are removed and the clamps, screw rods, guide rods, etc., which are tentative jigs are removed. Further, the fused and stretched fibers of the optical fibers 1, 2 are housed into a protective case 14. The protective members 17 and the protective case 14 are adhered and fixed to each other by the adhesive 20. Both ends of the protect case 14 are solidified and hermetically sealed by the adhesive 20. |
