US 12,001,050 B2
Manufacturing method of multicore fiber preform, multicore fiber preform, and multicore fiber
Masanori Takahashi, Tokyo (JP); Koichi Maeda, Tokyo (JP); Shinichi Arai, Tokyo (JP); Ryuichi Sugizaki, Tokyo (JP); and Masayoshi Tsukamoto, Tokyo (JP)
Assigned to FURUKAWA ELECTRIC CO., LTD., Tokyo (JP)
Filed by FURUKAWA ELECTRIC CO., LTD., Tokyo (JP)
Filed on Sep. 20, 2021, as Appl. No. 17/448,077.
Application 17/448,077 is a continuation of application No. PCT/JP2020/009956, filed on Mar. 9, 2020.
Claims priority of application No. 2019-059982 (JP), filed on Mar. 27, 2019.
Prior Publication US 2022/0003921 A1, Jan. 6, 2022
Int. Cl. G02B 6/02 (2006.01)
CPC G02B 6/02042 (2013.01) 2 Claims
OG exemplary drawing
 
1. A multicore fiber comprising:
n pieces of first core regions in a circular shape with a radius r1 that are arranged about points P11 to P1n, and that has a first core portion and a first cladding portion formed on an outer circumference of the first core portion by setting the points P11 to P1n at positions, distances of which are X11 to X1n, respectively, from a point a1, on straight lines dividing an end surface in to n pieces to have an equal central angle about the point a1 of the end surface such that X1max−r1<R1<X1min is satisfied, where a maximum value of X11 to X1n is X1max, and a minimum value thereof is X1min;
a second core region in a circular shape with a radius R1 that is arranged about the point a1, and that has a second core portion and a second cladding portion formed on an outer circumference of the second core portion; and
a cladding region that is formed on outer circumferences of the first core region and the second core region, wherein;
abutting surfaces that are flat surfaces abutting on each other are formed in portions on the outer circumferences of the first core region and the second core region, and
another cladding region having a softening temperature lower than the first cladding portion and the cladding region is arranged in place of the second core region.