Title:
PHOTODETECTION DEVICE AND LASER DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/245032
Kind Code:
A1
Abstract:
The present invention is provided with: a plurality of first optical fibers (3); an optical combiner (10) connected, at one end surface thereof, to one end surface of each of the first optical fibers (3); a second optical fiber (5) connected, at one end surface thereof, to the other end surface of the optical combiner (10); a first photodetector (21) that detects the intensity of light propagating through at least one first optical fiber (3); a second photodetector (22) that detects Rayleigh scattering of light propagating through the second optical fiber (5); and a calculation unit that calculates the intensity of the light propagating through the first optical fiber (3) or the second optical fiber (5) in a prescribed direction, on the basis of the detection result of the first photodetector (21) and the detection result of the second photodetector (22).
Inventors:
SAKAMOTO SHINICHI (JP)
KIYOYAMA WATARU (JP)
KIYOYAMA WATARU (JP)
Application Number:
PCT/JP2019/024740
Publication Date:
December 26, 2019
Filing Date:
June 21, 2019
Export Citation:
Assignee:
FUJIKURA LTD (JP)
International Classes:
G01J1/02; G02B6/26; G02B6/42; H01S3/00; H01S3/067; H01S3/23
Domestic Patent References:
| WO2015072198A1 | 2015-05-21 | |||
| WO2012073952A1 | 2012-06-07 | |||
| WO2014035505A2 | 2014-03-06 |
Foreign References:
| CN104713643A | 2015-06-17 | |||
| CN104836099A | 2015-08-12 | |||
| JP2018082045A | 2018-05-24 | |||
| JP2017518482A | 2017-07-06 | |||
| CN105953916A | 2016-09-21 | |||
| JP2019070598A | 2019-05-09 |
Other References:
See also references of EP 3812719A4
Attorney, Agent or Firm:
MORIMURA Yasuo et al. (JP)
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