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US 2024/0192437 A1Published application
Optical fiber
AssigneeFurukawa Electric Co., Ltd.
InventorYuki SATO
Life of this patent
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Abstract
An optical fiber includes a core portion, a side core layer, and a cladding portion, where Δ1>ΔClad>Δ2 and 0>Δ2 are satisfied, Δ1 is 0.35% or more and 0.45% or less, Δ2 is −0.2% or more and less than 0%, 2a is 8 μm or more and 10 μm or less, 2b is 35 μm or more and 45 μm or less, and a refractive index profile of the side core layer includes a bottom portion where a refractive index is lower than that of other regions of the side core layer, and a distance of a position of lowest refractive index in the bottom portion from a center of the core portion is a+(b−a)/1.55 μm or less.
Claims9
An optical fiber comprising:
- a core portion;
- a side core layer surrounding a periphery of the core portion;
- and
- a cladding portion surrounding a periphery of the side core layer, wherein
- Δ1>ΔClad>Δ2 and 0>Δ2 are satisfied where Δ1 is an average maximum relative refractive-index difference of the core portion to an average refractive index of the cladding portion, Δ2 is a relative refractive-index difference of an average refractive index of the side core layer, and ΔClad is a relative refractive-index difference of an average refractive index of the cladding portion to pure quartz glass,
- Δ1 is 0.35% or more and 0.45% or less,
- Δ2 is −0.2% or more and less than 0%,
- 2a is 8 μm or more and 10 μm or less, and 2b is 35 μm or more and 45 μm or less where a core diameter of the core portion is 2a and an outer diameter of the side core layer is 2b,
- a refractive index profile of the side core layer includes a bottom portion where a refractive index is lower than that of other regions of the side core layer, and
- a distance of a position of lowest refractive index in the bottom portion from a center of the core portion is a+(b−a)/1.55 μm or less.
7 more elements
Dependencies are inferred from the claim text.