Title:
BRILLOUIN GAIN ANALYSIS DEVICE, AND BRILLOUIN GAIN ANALYSIS METHOD
Document Type and Number:
WIPO Patent Application WO/2023/248437
Kind Code:
A1
Abstract:
The objective of the present invention is to provide a Brillouin gain analysis device and a Brillouin gain analysis method with which it is possible for high-speed strain changes in an optical fiber to be measured distributionally. A Brillouin gain analysis device 301 according to the present invention comprises: a laser 11 for outputting continuous light having a single frequency; a pulse generator 12 for pulsing the continuous light from the laser and inputting the same into one end of an optical fiber 50 being measured; an ASE light source 13 for generating continuous light having frequency components over a wider band than the frequency of the continuous light output by the laser 11, and inputting the same into the other end of the optical fiber 50; a modulator 14 for generating local light obtained by shifting the frequency of the continuous light from the laser 11 by an arbitrarily defined frequency; and a wave detector 15 for performing heterodyne detection between Brillouin scattered light generated by the optical fiber and the local light.
Inventors:
ISHIMARU TAKAHIRO (JP)
TAKAHASHI HIROSHI (JP)
WAKISAKA YOSHIFUMI (JP)
IIDA DAISUKE (JP)
KOSHIKIYA YUSUKE (JP)
TAKAHASHI HIROSHI (JP)
WAKISAKA YOSHIFUMI (JP)
IIDA DAISUKE (JP)
KOSHIKIYA YUSUKE (JP)
Application Number:
PCT/JP2022/025165
Publication Date:
December 28, 2023
Filing Date:
June 23, 2022
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
G01D5/353; G01M11/00; G01M11/02
Domestic Patent References:
| WO2015120888A1 | 2015-08-20 | |||
| WO2022009727A1 | 2022-01-13 | |||
| WO2014146676A1 | 2014-09-25 | |||
| WO2006001071A1 | 2006-01-05 |
Foreign References:
| JP2003322589A | 2003-11-14 | |||
| JP2012154678A | 2012-08-16 | |||
| JP2018132510A | 2018-08-23 | |||
| JP2012052999A | 2012-03-15 |
Attorney, Agent or Firm:
OKADA, Kenji et al. (JP)
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