Manufacturing method of optical fiber base material possessing low refractive index portion distantly-positioned from core

A manufacturing method and base material technology, applied in manufacturing tools, glass manufacturing equipment, optics, etc., can solve problems such as smaller mode field diameter, disappearance of interchangeability, and rising manufacturing costs

Active Publication Date: 2012-12-05
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is the easiest way to obtain a fiber that is good at bending to a certain extent, but it has the following problems: the mode field diameter becomes smaller by increasing the refractive index, and the zero dispersion wavelength becomes larger, which is different from ITU-T G.652 The interchangeability disappears and does not meet the specifications of the ITU-T G.657 part
This requires precise setup and, among other things, high precision for manufacturing, which leads to a significant increase in manufacturing costs

Method used

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  • Manufacturing method of optical fiber base material possessing low refractive index portion distantly-positioned from core
  • Manufacturing method of optical fiber base material possessing low refractive index portion distantly-positioned from core
  • Manufacturing method of optical fiber base material possessing low refractive index portion distantly-positioned from core

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Embodiment 1

[0038] Manufactured by the VAD method with an average density of 0.23g / cm 3 , The ratio of the core diameter to the shell diameter is 0.27, and the ash particle accumulation body is 150 mm in outer diameter. This soot accumulation body was inserted into a sintering furnace including an electric furnace and a quartz furnace core tube, while supplying He 16 [l / min], Cl 2 0.45[l / min], O 2 0.01 [l / min] while dehydrating at a temperature of 1100 [°C]. Thereafter, while supplying, He 20 [l / min], CF 4 0.03 [l / min] while vitrifying at a temperature of 1480 [°C]. Consider CF 4 When decomposed at high temperature in the furnace, the fluorine concentration becomes about 0.6 [mol%]. As a result, a core rod with an outer diameter of 65 mm was obtained in which the refractive index of the core portion was 0.40% higher than that of pure silica and the refractive index outside the shell portion was 0.10% lower than that of pure silica.

[0039] The core rod was heated and stretched with...

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Abstract

Provided is a method for manufacturing an optical fiber base material, comprising manufacturing a soot deposition body having a core with a high refractive index at a center thereof, using VAD or OVD; dehydrating the soot deposition body within a heating furnace, with a temperature that does not vitrify the soot deposition body and in a helium atmosphere containing chlorine; after the dehydration, forming a core rod by vitrifying the soot deposition body at a temperature that vitrifies the soot deposition body, in a helium atmosphere; and applying cladding on the outside of the core rod. The helium atmosphere in the heating furnace when vitrifying the soot deposition body includes a gas containing a fluorine compound, and concentration of the fluorine in the atmospheric gas is in a range of 0.1 mol % to 10 mol %.

Description

technical field [0001] The present invention relates to an optical fiber base material mainly used for communication, and more particularly to a method for manufacturing an optical fiber base material having a low-refractive-index portion at a position separated from the core. In particular, the present invention relates to a base material for an optical fiber having a low-refractive-index portion at a position separated from the core, and the base material for an optical fiber is manufactured at low cost and has a zero-dispersion wavelength without reducing the mode field diameter (Mode Field Diameter). An optical fiber base material with small and bendable optical fiber properties. Background technique [0002] In general, an optical fiber includes a core that transmits light and a sheath that surrounds the core. Usually, the refractive index of the core is higher than that of the shell. Optical fiber is obtained by heating and softening the base material for optical fib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B37/014
CPCC03B2201/12C03B37/01446C03B37/01453G02B6/0283G02B6/0365
Inventor 井上大
Owner SHIN ETSU CHEM IND CO LTD
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