| 摘要 |
There is provided a conversion plug for an optical signal that is low in optical loss, is easy in fabrication, and is inexpensive. A plug portion to be inserted into directly an optical signal terminal of a specified size is constituted by a tip portion and a sleeve portion of a ferrule. A plug-in hole into which an optical plug having a plug portion that cannot be inserted into directly the optical signal terminal of a specified size can be inserted, is formed in a fistulous optical plug supporting member to be tightly fitted into the ferrule. An optical fiber has an optical fiber fixing ring previously joined therewith on the periphery of one end portion of the optical fiber, and the end surface of the optical fiber protruding from the optical fiber fixing ring is previously finished in mirror surface. The optical fiber fixing ring and the optical fiber are inserted into the ferrule, and the optical fiber fixing ring is tightly fitted into the inside of the ferrule to fix the position of the end surface of the optical fiber already finished in mirror surface and inserted into a sleeve portion and a tip portion of the ferrule, at the optimal position.
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