Optical fiber
AssigneeNTT, Inc.
InventorsTakashi Matsui, Kazuhide Nakajima, Nobutomo Hanzawa, Yuto Sagae
Life of this patent
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Abstract
An object of the present disclosure is to provide an optical fiber having a simple structure, as well as attaining removal of loss components generated in an electric field part oozing out to a core-clad interface or a clad region and reduction in scattering loss generated from an interface with the clad region. The present disclosure relates to an optical fiber including a core for propagating light, a cladding disposed around the core, an air layer between the core and the cladding, and two or more bridges for supporting the core in the air layer.
Claims6
An optical fiber comprising:
- a core for propagating light,
- a cladding disposed around the core;
- an air layer between the core and the cladding;
- and
- two or more bridges for supporting the core in the air layer;
- wherein a refractive index of the cladding is lower than a refractive index of the core;
- and
- wherein, given that the number of propagation modes is (n+1), the refractive index of the cladding is lower than an effective refractive index of an n-th order mode and higher than an effective refractive index of an (n+1)-th order mode.
An optical fiber comprising:
- a core for propagating light,
- a cladding disposed around the core;
- an air layer between the core and the cladding;
- and
- two or more bridges for supporting the core in the air layer, wherein a relative refractive index difference Δ of the core to the cladding is as follows:
- 0.0748
- a
- -
- 1.962
- <
- Δ
- <
- 0.18
- a
- -
- 1.941
- [
- Math
- .
- 4
- ]
- where a is a radius of the core.
Dependencies are inferred from the claim text.