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US 12,481,097 B2Granted
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.
Claims10
A multicore fiber comprising:
- a plurality of core portions made of glass;
- and
- a cladding portion made of glass and configured to surround an outer periphery of the plurality of core portions,
- wherein the cladding portion has tensile stress of 20 MPa or lower in a region on an outer periphery side opposing an inner portion that is closest to the outer periphery the plurality of core portions, and
- a central region of the cladding portion is configured to have a maximum tensile stress greater than a maximum tensile stress in the region.
2 more elements
A multicore fiber preform comprising:
- a plurality of core portions made of glass;
- and
- a cladding portion made of glass and configured to surround an outer periphery of the plurality of core portions,
- wherein the cladding portion has a low softening point region on an outer periphery side thereof, and
- the low softening point region has a lower softening point compared to a softening point of a central region of the cladding portion so that the central region of the cladding portion is configured to have a maximum tensile stress greater than a maximum tensile stress in 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 so that a central region of the cladding portion is configured to have a maximum tensile stress greater than a maximum tensile stress in the third cladding portion.
Dependencies are inferred from the claim text.