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US 12,645,025 B2Granted
Multicore optical fiber and optical transmission system
AssigneeSumitomo Electric Industries, Ltd.
InventorsTakahiro Suganuma, Takemi Hasegawa, Tetsuya Hayashi, Hirotaka Sakuma
Life of this patent
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Abstract
A multi-core optical fiber includes: a pair of cores; and a cladding that covers both of the pair of cores. A diameter of the cladding is 124 μm or more and 126 μm or less. A distance between centers of the pair of cores is 46.5 μm or less. Cross talk between counter-propagating cores at a wavelength of 1550 nm is −30 dB/100 km or less.
Claims6
An uncoupled multi-core optical fiber comprising:
- a pair of cores, wherein diameters, materials, additive elements, or refractive index distributions of the pair of cores are different from each other, such that propagation constants of light waves propagating through the pair of cores are different from each other;
- a cladding that covers both of the pair of cores;
- and
- a low refractive index portion disposed between the pair of cores, being spaced apart from the pair of cores, and having a refractive index lower than a refractive index of the cladding and a diameter of at least 0.5 times a diameter of each of the pair of cores,
- wherein a diameter of the cladding is 124 μm or more and 126 μm or less,
- a distance between centers of the pair of cores is 46.5 μm or less, and
- cross talk between counter-propagating cores at a wavelength of 1550 nm is −30 dB/100 km or less.
4 more elements
Dependencies are inferred from the claim text.