US 11,835,756 B2
Optical fiber with primary and secondary coating layers
Kensaku Shimada, Osaka (JP); Kazuyuki Sohma, Osaka (JP); and Tatsuya Konishi, Osaka (JP)
Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
Appl. No. 17/289,948
Filed by SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
PCT Filed Nov. 8, 2019, PCT No. PCT/JP2019/043992
§ 371(c)(1), (2) Date Apr. 29, 2021,
PCT Pub. No. WO2020/096055, PCT Pub. Date May 14, 2020.
Claims priority of application No. 2018-211163 (JP), filed on Nov. 9, 2018.
Prior Publication US 2022/0011504 A1, Jan. 13, 2022
Int. Cl. G02B 6/02 (2006.01); C03C 25/1065 (2018.01); C03C 25/326 (2018.01)
CPC G02B 6/02395 (2013.01) [C03C 25/1065 (2013.01); C03C 25/326 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An optical fiber comprising:
a glass fiber comprising a core and a cladding; and
a coating resin layer coating the glass fiber,
wherein the coating resin layer has a primary resin layer in contact with the glass fiber and coating the glass fiber and a secondary resin layer coating the outer periphery of the primary resin layer,
the primary resin layer has a Young's modulus of 0.4 MPa or less at 23° C. and the primary resin layer has an outer diameter of 185 μm or more and 202 μm or less,
the secondary resin layer has a glass transition temperature of 60° C. or more and 95° C. or less, and
a difference between an average linear expansion coefficient of the coating resin layer in the range of 60° C. to 140° C. and an average linear expansion coefficient of the coating resin layer in the range of −60° C. to 0° C. is 0.7×10−4/° C. or less.