| 摘要 |
The present invention aims to simultaneously solve problems such as those related to the jig during skewing process of end surface at the final stage of production of glass capillary tube, and the shape of the exterior surface of the glass capillary tube being restricted by the structure of optical component such as optical waveguide device. Means for solving the problems include forming one or a plurality of flat portions 8, 9, and one or a plurality of partial cylindrical portions 10, 11 connected to such flat portions 8, 9 on exterior surface 7 of glass capillary tube 1 for holding optical fiber, all partial cylindrical portions 10, 11 being formed from a single central axis X and with the same radius, and forming insertion hole 3, into which optical fiber 2 is inserted and held, at a position deviated from central axis X in a direction perpendicular to first flat portion 8, which serves as a benchmark.
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