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Production process of fiber preform rod

A technology for optical fiber preforms and production methods, which is applied in the direction of glass fiber products, manufacturing tools, glass manufacturing equipment, etc., can solve problems such as difficulties, changes in the refractive index of the critical surface of the core and cladding, and affect the optical performance of optical fibers, etc., to achieve improved Optical fiber quality, improved manufacturing process, good technical effect

Active Publication Date: 2010-09-08
HANGZHOU FUTONG COMM TECH CO LTD
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Problems solved by technology

However, in the current actual production, it is very difficult to form an ideal step distribution of the refractive index. The dopant added to the inside of the fiber core to increase the refractive index, such as Ge elements, will diffuse to the outer cladding, making the core and The refractive index of the critical surface of the cladding changes sharply, forming a slope change with a slope
And this slope will affect the optical performance of the fiber, especially the dispersion wavelength, so that the zero dispersion wavelength will shift to the long wavelength side, as shown in Figure 1, affecting the transmission speed and quality of the single-mode fiber

Method used

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  • Production process of fiber preform rod
  • Production process of fiber preform rod
  • Production process of fiber preform rod

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Embodiment Construction

[0016] A method for producing an optical fiber preform, comprising the steps of conventionally producing a core rod and making a cladding, controlling the refractive index distribution of the preform during the synthesis of the loose body to dehydration and vitrification, and the diameter of the preform is D 20 with D 80 The ratio of ≤1.3, where D 20 with D 80 Respectively represent the diameters of the two places when the refractive index of the section of the preform is 20% and 80% relative to the maximum refractive index of the center. Among them, three different methods are used to change the shape of the refractive index profile of the preform rod section.

[0017] Method 1: During the dehydration of the loose body in the preform production process, the mixture of inert gas (such as helium, the supply rate is 20-50L / min) and dehydration gas (such as chlorine gas, the supply rate is 150-300cc / min) Oxygen is added to the environment, and the oxygen flow rate is 0.1-10L / m...

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Abstract

The present invention relates to optical fiber producing technology, and is especially production process of fiber preformrod. In the production process, the refraction index distribution shape in the profile of preformrod is regulated in synthesizing bulk body, dewatering and vitrification by means of adding oxygen, synthesizing in blow torch and regulating sintering temperature, so as to reach ideal refraction index distribution. The present invention can raise the quality of drawn optical fiber.

Description

【Technical field】 [0001] The invention relates to the field of optical fiber manufacturing, in particular to a method for producing an optical fiber preform. 【Background technique】 [0002] Chromatic dispersion is an important parameter that indicates the degree of signal degradation of single-mode fiber. The dispersion value will change with the wavelength, and different wavelengths have different requirements for the dispersion value. The wavelength when the dispersion is zero is called the zero dispersion wavelength, so it is hoped that the zero dispersion wavelength is consistent with the actual wavelength in the use of optical fibers. Since the zero dispersion wavelength is affected by the cut-off wavelength and the Δ value on the refractive index distribution, the mode field diameter (MFD) and bending characteristics are also affected by the Δ value, so the design distribution range of the refractive index should comprehensively consider the above characteristics. Am...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/012C03B37/018
CPCC03B37/01446C03B37/0142C03B2207/64C03B2203/22
Inventor 卢卫民森昭彦李群星陈海斌
Owner HANGZHOU FUTONG COMM TECH CO LTD
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