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US 2023/0408759 A1Published application
Multicore fiber, manufacturing method for multicore fiber, multicore fiber preform, and manufacturing method for multicore fiber preform
AssigneeFurukawa Electric Co., Ltd.
InventorsMasanori TAKAHASHI, Koichi MAEDA, Ryuichi SUGIZAKI
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Abstract
A multicore fiber includes: a plurality of core portions made of glass; and a cladding portion made of glass and configured to surround outer periphery of the plurality of core portions. The cladding portion has tensile stress of 20 MPa or lower in a region on outer periphery side than a core portion that is closest to outer periphery of the cladding portion in the plurality of core portions.
Claims11
A multicore fiber comprising:
- a plurality of core portions made of glass;
- and
- a cladding portion made of glass and configured to surround outer periphery of the plurality of core portions, wherein
- the cladding portion has tensile stress of 20 MPa or lower in a region on outer periphery side than a core portion that is closest to outer periphery of the cladding portion in the plurality of core portions.
1 more element
A multicore fiber preform comprising:
- a plurality of core portions made of glass;
- and
- a cladding portion made of glass and configured to surround outer periphery of the plurality of core portions, wherein
- the cladding portion has a low softening point region on outer periphery side of a core portion that is closest to outer periphery of the cladding portion in the plurality of core portions, and
- the low softening point region has a lower softening point as compared to softening point in a region on center side than the low softening point region.
2 more elements
A manufacturing method for a multicore fiber preform, comprising:
- housing each of a plurality of core preforms, which includes a core portion and a first cladding portion surrounding the core portion, into a groove formed on a columnar second cladding portion, which has a plurality of grooves formed on faces along longitudinal direction;
- and
- inserting the second cladding portion along with the plurality of core preforms into a cylindrical third cladding portion, wherein
- softening point of the third cladding portion is lower than softening points of the core preforms and the second cladding portion.
1 more element
Dependencies are inferred from the claim text.