Optical fiber
AssigneeFurukawa Electric Co., Ltd.
InventorKazunori Mukasa
Life of this patent
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Abstract
An optical fiber includes: a core portion made of glass; a cladding portion that is located on an outer periphery of the core portion and that is made of glass having a lower refractive index than a refractive index of the core portion; and a coating portion that covers an outer periphery of the cladding portion. Further, an average value of a relative refractive-index difference of a center core of the core portion is 0.1 to 0.5%, a fiber diameter including the coating portion is equal to or smaller than 220 μm, an effective cutoff wavelength is longer than 1260 nm and smaller than 1530 nm, and a mode field diameter of light at 1550 nm is equal to or larger than 9 μm.
Claims15
An optical fiber comprising:
- a core portion made of glass;
- a cladding portion that is located on an outer periphery of the core portion and that is made of glass having a lower refractive index than a refractive index of the core portion;
- and
- a coating portion that covers an outer periphery of the cladding portion, wherein
- the optical fiber has a step-type refractive index profile,
- an average value of a relative refractive-index difference of a center core of the core portion is 0.35 to 0.42%,
- a fiber diameter including the coating portion is equal to or smaller than 220 μm,
- an effective cutoff wavelength is longer than 1260 nm and smaller than 1530 nm, and
- a mode field diameter of light at 1550 nm is equal to or larger than 9 μm.
An optical fiber comprising:
- a core portion made of glass;
- a cladding portion that is located on an outer periphery of the core portion and that is made of glass having a lower refractive index than a refractive index of the core portion;
- and
- a coating portion that covers an outer periphery of the cladding portion, wherein the optical fiber has a W-type refractive index profile,
- an average value of a relative refractive-index difference of a center core of the core portion is 0.36%,
- a fiber diameter including the coating portion is equal to or smaller than 220 μm,
- an effective cutoff wavelength is longer than 1260 nm and smaller than 1530 nm, and
- a mode field diameter of light at 1550 nm is equal to or larger than 9 μm.
An optical fiber comprising:
- a core portion made of glass;
- a cladding portion that is located on an outer periphery of the core portion and that is made of glass having a lower refractive index than a refractive index of the core portion;
- and
- a coating portion that covers an outer periphery of the cladding portion,
- wherein the optical fiber has a trench-type refractive index profile,
- an average value of a relative refractive-index difference of a center core of the core portion is 0.36 to 0.37%,
- a diameter of the core portion is 8 to 9 μm,
- b/a is equal to or larger than 2.5 and equal to or smaller than 5, where 2b is an inner diameter of a trench layer
- c/a is equal to or larger than 2.5 and equal to or smaller than 6, where 2c is an outer diameter of the trench layer,
- a fiber diameter including the coating portion is equal to or smaller than 220 μm,
- an effective cutoff wavelength is longer than 1260 nm and smaller than 1530 nm, and
- a mode field diameter of light at 1550 nm is equal to or larger than 9 μm.
Dependencies are inferred from the claim text.