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US 11,467,340 B2Granted
Optical fiber
AssigneeSumitomo Electric Industries, Ltd.
InventorTakemi Hasegawa
Life of this patent
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Abstract
An optical fiber according to an embodiment includes a core, a cladding, and a coating layer. At the boundary between the core and the cladding, the local sound velocity decreases in the direction from the core side toward the cladding side. At least in the cladding, the local sound velocity changes continuously in a radial direction. Further, the line width of the Brillouin gain of the light beam guided by the fundamental mode is 60 MHz or more.
Claims8
An optical fiber comprising:
- a core extending along a fiber axis and mainly comprised of silica glass;
- a cladding surrounding the core and mainly comprised of silica glass, the cladding having a refractive index lower than a refractive index of the core;
- and
- a coating layer comprised of a resin material, the coating layer surrounding the cladding,
- wherein,
- in a glass region including a boundary between the core and the cladding, a local sound velocity decreases in a direction from a side of the core toward a side of the cladding,
- at least in the cladding, the local sound velocity changes continuously in a radial direction from the fiber axis toward an outer peripheral surface of the cladding, and
- a Brillouin gain of a light beam guided by a fundamental mode has a line width of 60 MHz or more.
5 more elements
Dependencies are inferred from the claim text.