| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an identifying device of an optical fiber type for identifying the optical fiber type used in a system in service, without interrupting the service. Ž<P>SOLUTION: This identifying device comprises: a grating-forming apparatus 130 for forming long-period grating in an optical fiber 101; a light-receiving unit 140 for receiving leak light λ<SB>1</SB>' generated by the grating formation apparatus; and a database and fiber type determination apparatus 150 for collating the wavelength of the leaking light received by the light-receiving unit with the wavelength of the leak light of various optical fibers that is previously measured and stored, and identifying the optical fiber type. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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