Multi-core fiber
AssigneesFujikura Ltd., National University Corporation Hokkaido University
InventorsShoichiro Matsuo, Kunimasa Saitoh, Masanori Koshiba
Life of this patent
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Abstract
A multicore fiber includes six or more of core elements having a core, a first clad surrounding the outer circumferential surface of the core and a second clad surrounding the outer circumferential surface of the first clad, and includes a clad surrounding the core elements. All of expressions are satisfied: n1>n2>n3, n1>n4, n3<n4, wherein the refractive index of the core is n1, the refractive index of the first clad is n2, the refractive index of the second clad is n3, and the refractive index of the clad is n4. The core elements are disposed so that the inter-center pitch between the cores adjacent to each other is disposed at regular spacing and the centers of the cores are annularly disposed.
Claims9
A multi-core fiber comprising:
- six or more of core elements including:
- a core;
- a first clad surrounding an outer circumferential surface of the core;
- and
- a second clad surrounding an outer circumferential surface of the first clad;
- and
- a clad surrounding the core elements, wherein:
- all of expressions are satisfied:
- n1>n2>n3
- n1>n4
- n3<n4
- wherein a refractive index of the core is n1, a refractive index of the first clad is n2, a refractive index of the second clad is n3, and a refractive index of the clad is n4;
- and
- the core elements are disposed so that an inter-center pitch between the cores adjacent to each other is disposed at regular spacings and centers of the cores are annularly disposed.
Dependencies are inferred from the claim text.