OPTICAL FIBER COUPLER AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide an optical fiber coupler having little wavelength shift in insertion loss even if used under high humidity and high temperature. SOLUTION: The optical fiber coupler is structured by fusing/drawing plural optical fibers 1 and by sticking/fixing them to a mounting member 6 with an adhesive 8. The adhesive 8 has a Young's modulus of 100 MPa or above at 85 deg.C, fixing the fused/drawn part 3 on the mounting member 6 with a tensile force of not less than 40 mN and not more than 200 mN at room temperature.