Optical fiber and optical fiber transmission line, and manufacturing method therefor
OwnerTakemi Hasegawa, Masashi Onishiinventors
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Abstract
Provided is an optical fiber having holes extending along the axis whose transmission loss is substantially reduced and the manufacturing method thereof. First, a plurality of through-holes 9 are formed in a preform 5 extending along the preform axis. Subsequently, the preform 5 is heated by heating means 24 in the furnace preferably for 30 minutes or more at a temperature equal to or more than 800° C. while flowing a dry gas in the through-holes 9. As a result, the OH group which exists on the surfaces of the inner walls 5a of the through-holes 9 of the preform 5 is discharged outside the preform. Subsequently, the preform 5 is drawn into an optical fiber.
Claims23
A manufacturing method of an optical fiber having one or more holes extending along the axis, comprising:
- a first process for forming holes in a preform;
- a second process for heating the preform and drying the inside of the holes;
- and
- a third process for drawing the preform into an optical fiber.
An optical fiber having a core and a cladding, the cladding surrounding the core, and either or both of the core and the cladding being provided with one or more holes extending along the axis;
- the optical fiber allowing light to propagate in an axial direction by confining the light in the core the total reflection or Bragg reflection at a transmission loss of 200 dB/km or less at the 1380 nm wavelength.
An optical fiber having a core and a cladding, the cladding surrounding the core, and either or both of the core and the cladding being provided with one or more holes extending along the axis;
- the optical fiber allowing light to propagate in an axial direction by confining the light in the core by total reflection or Bragg reflection at a transmission loss of 10 dB/km or less at the 1550 nm wavelength.
An optical transmission system including at least one optical fiber having a core and a cladding, the cladding surrounding the core, and either or both of the core and the cladding being provided with one or more holes extending along the axis;
- the optical fiber allowing light to propagate in an axial direction by confining the light in the core by the total reflection or Bragg reflection at a transmission loss of 10 dB/km or less at the 1550 nm wavelength.
Dependencies are inferred from the claim text.