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US 8,798,420 B2Granted
Multi-mode optical fiber
AssigneeSumitomo Electric Industries, Ltd.
InventorsKazuhiro Yonezawa, Sumio Hoshino
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Abstract
The present invention relates to a GI-type multi-mode optical fiber in which the outer diameter 2a of a core is 47.5 to 52.5 μm or 60 to 65 μm. In the multi-mode optical fiber, stress in the optical axis direction remaining in an outermost peripheral portion of the cladding is tensile stress of 0 to 25 MPa, the outermost peripheral portion of the cladding being defined as a region having a diameter of 1.8b or more when the diameter of the cladding is 2b.
Claims11
A multi-mode optical fiber, comprising:
- a core extending along an optical axis direction and doped with GeO2;
- and
- a cladding provided to an outer periphery of the core and having a refractive index lower than that of the core,
- wherein, in a refractive index profile in a diametric direction of the multi-mode optical fiber, an α value of a portion corresponding to the core is 1.9 to 2.2, a maximum relative refractive index difference Δ of the core with respect to the cladding is 0.8 to 2.4%, and a diameter 2a of the core is 47.5 to 52.5 μm or 60 to 65 μm,
- wherein stress in the optical axis direction remaining in an outermost peripheral portion of the cladding is tensile stress of 0 to 25 MPa, the outermost peripheral portion being defined as a region having a diameter of 1.8b or more when the diameter of the cladding is 2b, and
- wherein, in a cross section of the multi-mode optical fiber orthogonal to the optical axis direction, an inner portion completely surrounded by the outermost peripheral portion includes a part in which compressive stress remains as the stress in the optical axis direction.
3 more elements
A multi-mode optical fiber, comprising:
- a core extending along an optical axis direction and doped with GeO2;
- a cladding provided to an outer periphery of the core and having a refractive index lower than that of the core;
- and
- a trench portion provided between the core and the cladding and having a refractive index lower than that of the cladding,
- wherein, in a refractive index profile in a diametric direction of the multi-mode optical fiber, an α value of a portion corresponding to the core is 1.9 to 2.2, a maximum relative refractive index difference Δ of the core with respect to the cladding is 0.8 to 2.4%, and a diameter 2a of the core is 47.5 to 52.5 μm or 60 to 65 μm,
- wherein stress in the optical axis direction remaining in an outermost peripheral portion of the cladding is tensile stress of 0 to 25 MPa, the outermost peripheral portion being defined as a region having a diameter of 1.8b or more when the diameter of the cladding is 2b, and
- wherein, in a cross section of the multi-mode optical fiber orthogonal to the optical axis direction, an inner portion completely surrounded by the outermost peripheral portion includes a part in which compressive stress remains as the stress in the optical axis direction.
4 more elements
Dependencies are inferred from the claim text.