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1. (WO2018181133) CLADDING MODE LIGHT REMOVAL STRUCTURE AND LASER DEVICE

Pub. No.:    WO/2018/181133    International Application No.:    PCT/JP2018/012044
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Tue Mar 27 01:59:59 CEST 2018
IPC: G02B 6/44
G02B 6/255
H01S 3/067
Applicants: FUJIKURA LTD.
株式会社フジクラ
Inventors: KUNIYASU Kenji
國安 賢治
MATSUMOTO Ryokichi
松本 亮吉
Title: CLADDING MODE LIGHT REMOVAL STRUCTURE AND LASER DEVICE
Abstract:
The present invention provides a cladding mode light removal structure capable of effectively removing cladding mode light while suppressing heat generation in the coating of an optical fiber. A cladding mode light removal structure 1 is provided with: an exposed cladding part 28 where a cladding 24 of an input-side optical fiber 20 is exposed; an exposed cladding part 38 where a cladding 34 of an output-side optical fiber 30 is exposed; a fusion splicing part 40 where the exposed cladding parts 28, 38 are fusion spliced; a high refractive index resin 50 having a refractive index higher than or equal to the refractive index of the cladding 24; and a low refractive index part S comprising a medium having a refractive index lower than the refractive index of the cladding 34. The high refractive index resin 50 is provided within a housing space R of a fiber housing part 10 so as to cover a downstream side end of a coating 26, the whole of the cladding 24 exposed in the exposed cladding part 28, the fusion splicing part 40, and part of the cladding 34. The low refractive index part S is located between the high refractive index resin 50 and a coating 36 of the output-side optical fiber 30 and around the output-side exposed cladding part 38.