| 摘要 |
PROBLEM TO BE SOLVED: To realize a high space resolution by signal light incidence only from the one side end of an optical fiber, in a measuring method using a Brillouin scattering phenomenon. SOLUTION: A device includes an optical pulse generation means 3 for generating a pulse train 3a wherein a time interval between the first pulsed light and the second pulsed light is a time interval shorter than the lifetime of an acoustic wave from coherent light 2a, and allowing it to enter an optical fiber 7; a detection means 8 for converting a light signal acquired by multiplexing backward Brillouin scattering light of the first pulsed light with the coherent light into an electric signal; a signal processing means 14 for generating an interference signal by taking the sum of the electric signal and an electric signal acquired by delaying the electric signal as long as a time interval portion between the first pulsed light and the second pulsed light, and determining a characteristic of the optical fiber based on the interference signal; and an electric or optical frequency variable means 10 for acquiring a Brillouin spectrum from the electric signal. COPYRIGHT: (C)2008,JPO&INPIT
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