Title:
光ファイバ特性測定装置及び光ファイバ特性測定方法
Document Type and Number:
Japanese Patent JP6791113
Kind Code:
B2
Abstract:
An optical fiber characteristics measuring apparatus includes a light source, first and second optical branching units, a detection unit, a measuring unit and a control unit. The light source unit outputs frequency-modulated continuous wave of light. The first optical branching unit branches the continuous light into pump light and reference light. The second optical branching unit outputs backscattered light generated by the pump light incident from one end of an optical fiber and subjected to Brillouin scattering in the optical fiber. The detection unit detects interference light of the backscattered light and the reference light. The measuring unit measures characteristics of the optical fiber by a detection signal from the detection unit. The control unit controls the light source unit to change modulation frequency of the continuous light in units of one period or half a period of a modulation period corresponding to the modulation frequency.
Inventors:
Yasushi Furukawa
Application Number:
JP2017252458A
Publication Date:
November 25, 2020
Filing Date:
December 27, 2017
Export Citation:
Assignee:
Yokogawa Electric Corporation
International Classes:
G01M11/00; G01D5/26; G01D5/353; G01K11/322
Domestic Patent References:
| JP2009139241A | ||||
| JP2016148661A |
Foreign References:
| US20120237205 | ||||
| US20120230628 | ||||
| CN102645268A |
Attorney, Agent or Firm:
Sumio Tanai
Yoshifumi Saeki
Hisanori Takahashi
Takeo Okita
Yoshifumi Saeki
Hisanori Takahashi
Takeo Okita