Multicore fiber, optical fiber cable, and optical connector
A multicore fiber includes: a cladding; and three or more and five or less cores disposed at rotationally asymmetric positions on a circumference centered at a center of the cladding. No core is disposed at the center of the cladding. Angles formed by adjacent ones of lines connecting the center of the cladding and respective ones of the cores are all larger than 60°.
1. A multicore fiber comprising:
a cladding; and
four or five cores disposed at rotationally asymmetric positions on a circumference centered at a center of the cladding, wherein
no core is disposed at the center of the cladding,
angles formed by adjacent ones of lines connecting the center of the cladding and respective ones of the cores are all larger than 60°,
the angles are all different, and
a narrowest angle of the angles is not adjacent to a second narrowest angle of the angles.
2. The multicore fiber according to claim 1 , wherein two or more of the cores are disposed at linearly asymmetric positions with reference to a line passing through the center of the cladding and extending along a radial direction of the cladding.
3. The multicore fiber according to claim 2 , wherein a number of the cores is four.
4. An optical fiber cable comprising:
a sheath; and
the multicore fiber according to claim 2 in the sheath.
5. An optical connector comprising:
a ferrule; and
the multicore fiber according to claim 2 , wherein
one end of the multicore fiber is disposed in a fiber insertion hole of the ferrule.
6. An optical fiber cable comprising:
a sheath; and
the multicore fiber according to claim 1 in the sheath.
7. An optical connector comprising:
a ferrule; and
the multicore fiber according to claim 1 , wherein
one end of the multicore fiber is disposed in a fiber insertion hole of the ferrule.
8. The multicore fiber according to claim 1 , wherein a number of the cores is four.
9. A multicore fiber comprising:
a cladding; and
four or five cores disposed at rotationally asymmetric positions on a circumference centered at a center of the cladding, wherein
no core is disposed at the center of the cladding,
angles formed by adjacent ones of lines connecting the center of the cladding and respective ones of the cores are all larger than 60°,
two angles of the angles are different from remaining angles,
the two angles are different from each other, and
all of the remaining angles are the same.
10. The multicore fiber according to claim 9 , wherein two or more of the cores are disposed at linearly asymmetric positions with reference to a line passing through the center of the cladding and extending along a radial direction of the cladding.
11. An optical fiber cable comprising:
a sheath; and
the multicore fiber according to claim 10 in the sheath.
12. An optical connector comprising:
a ferrule; and
the multicore fiber according to claim 10 , wherein
one end of the multicore fiber is disposed in a fiber insertion hole of the ferrule.
13. The multicore fiber according to claim 9 , wherein a number of the cores is four.
14. An optical fiber cable comprising:
a sheath; and
the multicore fiber according to claim 9 in the sheath.
15. An optical connector comprising:
a ferrule; and
the multicore fiber according to claim 9 , wherein
one end of the multicore fiber is disposed in a fiber insertion hole of the ferrule.