US 12,130,488 B2
Optical fiber
Hideyuki Hirano, Kyoto (JP); Keiichiro Hirose, Kyoto (JP); Syoji Nakazono, Kyoto (JP); Akihiko Koyama, Kyoto (JP); Takaya Konishi, Hyogo (JP); Ai Takahashi, Hyogo (JP); and Masakatsu Setoguchi, Hyogo (JP)
Assigned to TATSUTA ELECTRIC WIRE & CABLE CO., LTD., Osaka (JP); and MARUYAMA FROSTING CO., LTD., Hyogo (JP)
Appl. No. 17/624,982
Filed by TATSUTA ELECTRIC WIRE & CABLE CO., LTD., Osaka (JP); and MARUYAMA FROSTING CO., LTD., Hyogo (JP)
PCT Filed Aug. 28, 2020, PCT No. PCT/JP2020/032594
§ 371(c)(1), (2) Date Jan. 5, 2022,
PCT Pub. No. WO2021/039962, PCT Pub. Date Mar. 4, 2021.
Claims priority of application No. 2019-158712 (JP), filed on Aug. 30, 2019.
Prior Publication US 2022/0291472 A1, Sep. 15, 2022
Int. Cl. G02B 6/44 (2006.01); G02B 6/02 (2006.01)
CPC G02B 6/4479 (2013.01) [G02B 6/02004 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An optical fiber comprising:
a core; and
a clad arranged around the core such that part of the core is exposed,
wherein a rough surface portion is provided at least at part of an outer surface of the core exposed portion exposed through the clad,
an arithmetic surface roughness Ra, according to JIS B 0601-2013, of the rough surface portion is equal to or greater than 0.2 μm, and
an average length Rsm, according to JIS B 0601-2013, of a rough curve element of the rough surface portion is equal to or greater than 17 μm.