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Title:
OPTICAL FIBER CHARACTERISTIC MEASUREMENT DEVICE AND OPTICAL FIBER CHARACTERISTIC MEASUREMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2021/111894
Kind Code:
A1
Abstract:
This optical fiber characteristic measurement device (1-3) comprises a photodetection unit (15, 15A) for detecting Brillouin scattered light (LS) obtained by causing light to enter an optical fiber (FUT), an intensity acquisition unit (16, 16A) for obtaining the signal intensities of predefined reference frequencies (f1, f2) from detection signals (S1-S3) output from the photodetection unit, and a measurement unit (18, 18A, 18B) for measuring a characteristic of the optical fiber by determining, from the reference frequency signal intensities acquired by the intensity acquisition unit, the peak frequency of a Brillouin gain spectrum that is the spectrum of the Brillouin scattered light.

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Inventors:
TEZUKA SHIN-ICHIROU (JP)
HONMA MASAYOSHI (JP)
MATSUURA SATOSHI (JP)
Application Number:
PCT/JP2020/043327
Publication Date:
June 10, 2021
Filing Date:
November 20, 2020
Export Citation:
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Assignee:
YOKOGAWA ELECTRIC CORP (JP)
International Classes:
G01D5/353; G01M11/00
Domestic Patent References:
WO2005028995A12005-03-31
WO2010061718A12010-06-03
Foreign References:
JP2016148661A2016-08-18
US20190072417A12019-03-07
CN110470327A2019-11-19
JPS515302B11976-02-19
Other References:
See also references of EP 4071446A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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