US 12,459,853 B2
Multi-core optical fiber preform, multi-core optical fiber preform production method, and multi-core optical fiber production method
Ryohei Fukumoto, Sakura (JP); and Katsuhiro Takenaga, Sakura (JP)
Assigned to Fujikura Ltd., Tokyo (JP)
Appl. No. 18/246,919
Filed by Fujikura Ltd., Tokyo (JP)
PCT Filed Feb. 18, 2022, PCT No. PCT/JP2022/006756
§ 371(c)(1), (2) Date Mar. 28, 2023,
PCT Pub. No. WO2022/176990, PCT Pub. Date Aug. 25, 2022.
Claims priority of application No. 2021-026466 (JP), filed on Feb. 22, 2021.
Prior Publication US 2023/0382779 A1, Nov. 30, 2023
Int. Cl. C03B 37/012 (2006.01); C03B 37/027 (2006.01)
CPC C03B 37/01222 (2013.01) [C03B 37/01251 (2013.01); C03B 37/027 (2013.01); C03B 2203/34 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A multi-core optical fiber preform comprising:
a rod-shaped main cladding body having one or more main inner holes;
main core rods inserted into the one or more main inner holes; and
a tip continuously-installed portion disposed at one end of the rod-shaped main cladding body and including a glass rod having a single core rod.