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US 8,787,720 B2Granted
Optical fiber
AssigneeFurukawa Electric Co., Ltd.
InventorsKazunori Mukasa, Yukihiro Tsuchida
Life of this patent
Estimating the term…
Abstract
An optical fiber includes a core portion that confines light therein and guides the light therethrough and a cladding portion that is formed around an outer circumference of the core portion. The cladding portion contains a hole which is formed at a position a distance away from the core portion such that the hole does not substantially affect an effective core area or a chromatic dispersion characteristic of the optical fiber. The hole decreases a microbending loss of the optical fiber.
Claims6
An optical fiber comprising:
- a core portion that confines light therein and guides the light therethrough;
- and
- a cladding portion that is made of a first silica glass that is formed around an outer circumference of the core portion, wherein
- the core portion includes a center core portion that is made of a second silica glass that has a refractive index greater than a refractive index of the first silica glass of the cladding portion and the core portion includes an outer core portion that is made of a third silica glass that has a refractive index less than the refractive index of the first silica glass of the cladding portion, the outer core portion being around an outer circumference of the center core portion,
- the cladding portion contains between 12 to 36 holes arranged in a circular shape, a center of the circular shape laying on the core portion, a diameter of each of the holes is between 2 μm to 10 μm, and a distance between a center of one of the holes that is closest to the core portion and the center of the core portion is equal to or greater than 25 μm, and
- the holes are arranged to not affect the effective core area of the optical fiber and to not affect the chromatic dispersion characteristic.
3 more elements
Dependencies are inferred from the claim text.