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US 2023/0016133 A1Published application
Optical fiber
AssigneeSumitomo Electric Industries, Ltd.
InventorsTakemi HASEGAWA, Yuki KAWAGUCHI
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Abstract
The present disclosure relates to an optical fiber having a structure that has a low transmission loss and can be produced with high productivity. An optical fiber according to an embodiment includes a core and a cladding. The core is comprised of silica glass to which bromine is added, and the cladding has a refractive index lower than a maximum refractive index of the core. The core has compressive stress.
Claims4
1:
- An optical fiber comprising:
- a core configured to extend along a central axis, and be comprised of silica glass to which bromine is added;
- and
- a cladding configured to surround the core, have a refractive index lower than a maximum refractive index of the core, and be comprised of silica glass, wherein
- the core has compressive stress.
2 more elements
2:
- The optical fiber according to claim 1, wherein
- the cladding includes
- a first cladding configured to surround the core, and be comprised of silica glass to which fluorine is added, and
- a second cladding configured to surround the first cladding, be comprised of pure silica glass or silica glass to which fluorine having a concentration lower than a fluorine concentration of the first cladding is added, and have tensile stress.
1 more element
3:
- The optical fiber according to claim 1, wherein
- the cladding includes
- a first cladding configured to surround the core, and be comprised of silica glass to which fluorine is added,
- a second cladding configured to surround the first cladding, be comprised of pure silica glass or silica glass to which fluorine having a concentration lower than a fluorine concentration of the first cladding is added, and have tensile stress, and
- a third cladding configured to surround the second cladding, be comprised of pure silica glass or silica glass to which fluorine having a concentration lower than a fluorine concentration of the first cladding is added, and have compressive stress.
2 more elements
4:
- The optical fiber according to claim 1, wherein
- the core further contains chlorine, and
- a viscosity adjustment region defined on a cross section of the optical fiber orthogonal to the central axis has a shape surrounding the central axis in a state of being separated from the central axis, an inner peripheral portion and an outer peripheral portion arranged to sandwich a boundary between the core and the cladding in a state of being separated by a distance 2 μm or more, and a viscosity distribution continuously changing along a radial direction from the central axis toward an outer periphery of the optical fiber.