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1. (WO2018042788) OPTICAL FIBER

Pub. No.:    WO/2018/042788    International Application No.:    PCT/JP2017/020145
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Wed May 31 01:59:59 CEST 2017
IPC: G02B 6/036
G02B 6/024
G02B 6/30
Applicants: FUJIKURA LTD.
Inventors: HIRAKAWA, Keisuke
平川 圭祐
ICHII, Kentaro
市井 健太郎
HAYASHI, Kazuyuki
林 和幸
Provided is an optical fiber capable of sufficiently reducing the connection loss at a fusion splice point with a CSMF. The optical fiber is configured such that the refractive index of inner cladding (12) is substantially the same as the refractive index of outer cladding (13) while the concentration of the up-dopant in the inner cladding (12) is set so that the rate of increase of the refractive index due to the up-dopant is between 0.25% and 0.5%, inclusive.