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US 5,963,700 AGranted
Optical fiber
AssigneeNippon Telegraph and Telephone Corporation
InventorsMasao Kato, Kenji Kurokawa, Tuneo Horiguchi, Yoshiaki Miyajima
Life of this patent
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Abstract
An optical fiber includes a core, a first cladding, a second cladding, and a third cladding. The core has a refractive index n.sub.0. The first cladding is formed around the core and has a refractive index n.sub.1. The second cladding is formed around the first cladding and has a refractive index n.sub.2. The third cladding is formed around the second cladding and has a refractive index n.sub.3. The refractive indices have relationships n.sub.1 >n.sub.2 >n.sub.3 and n.sub.1 >n.sub.0.
Claims17
An optical fiber comprising:
- a core having a refractive index n.sub.0 ;
- a first cladding formed around said core and having a refractive index n.sub.1 ;
- a second cladding formed around said first cladding and having a refractive index n.sub.2 ;
- and
- a third cladding formed around said second cladding and having a refractive index n.sub.3,
- wherein the refractive indices have relationships n.sub.1 >n.sub.2 >n.sub.3 and n.sub.1 >n.sub.0.
3 more elements
Dependencies are inferred from the claim text.