| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to obtain good optical performance without the occurrence of chipping at an insertion end face at the time of insertion of a bare optical fiber into an aligning member by providing this bare optical fiber with a convergently tapered part heading toward the insertion end face and a curved part enveloping the peripheral surface of this tapered part and the insertion end face. SOLUTION: The bare optical fiber 12 consists of a glass core 12a and a glass clad 12b. The terminal of the bare optical fiber 12 is composed of the insertion end face 21 which intersects nearly orthogonally with its axial center and is formed to the diameter larger than the diameter of the glass core 12a, the convergently tapered part 22 heading toward the insertion end face 21 and the curved part 23 enveloping the peripheral surface of the tapered part 22 and the insertion end face 21. For example, the bare optical fiber 12 is assumed to be a multimode optical fiber having a core diameter of 50μm and a clad diameter of 125μm. The taper angleθof the tapered part 22 is selected at, for example, 30 deg.. The curvature R of the curved part 23 is selected at, for example, about 25μm. |
