Title:
PHOTODETECTOR DEVICE AND LASER SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/189317
Kind Code:
A1
Abstract:
The present invention provides a photodetector device capable of detecting, with high accuracy, laser light which propagates through an optical fiber core. A photodetector device 30 comprises an optical fiber 34 which includes a core 40, an inner cladding 41 having a refractive index lower than the refractive index of the core 40, and an outer cladding 43 having a refractive index which is equal to or less than the refractive index of the inner cladding 41. The photodetector device 30 further comprises: a photodetector 60 which is disposed in a photodetector region 51 of the optical fiber 34 and detects the laser light which propagates through the core 40 of the optical fiber 34; an upstream light removal unit 71 which, in an upstream light removal region 52 positioned upstream of the photodetector region 51 of the optical fiber 34, removes at least a portion L1 of residual light which propagates through the outside of the core 40 of the optical fiber 34; and a downstream light removal unit 72 which, in a downstream light removal region 53 positioned downstream of the photodetector region 51 of the optical fiber 34, removes at least a portion L2 of reflected light which propagates through the outside of the core 40 of the optical fiber 34.
Inventors:
HIDAKA HIKARU (JP)
Application Number:
PCT/JP2019/013105
Publication Date:
October 03, 2019
Filing Date:
March 27, 2019
Export Citation:
Assignee:
FUJIKURA LTD (JP)
International Classes:
H01S3/00; G01J1/02; G02B6/02; G02B6/036; G02B6/44; H01S3/067
Foreign References:
| JP2016161867A | 2016-09-05 | |||
| JP2017116465A | 2017-06-29 | |||
| JP2017021099A | 2017-01-26 | |||
| CN204116642U | 2015-01-21 | |||
| US20140363125A1 | 2014-12-11 | |||
| US20140313513A1 | 2014-10-23 | |||
| JP2012014173A | 2012-01-19 | |||
| US20070217738A1 | 2007-09-20 | |||
| JPH04291213A | 1992-10-15 |
Attorney, Agent or Firm:
MORI Tomohiro (JP)
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