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Method for producing low water peak optic fiber prefabricated piece

A technology of optical fiber prefabricated parts and manufacturing methods, applied in the field of optical fibers, can solve the problems of reducing water peak attenuation, reducing the OH content of optical fiber preforms, and the halogenation dehydration method cannot meet the requirements, so as to achieve the effect of reducing water content and reducing light attenuation

Inactive Publication Date: 2003-11-26
HANGZHOU FUTONG COMM TECH CO LTD
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  • Application Information

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Problems solved by technology

[0007] However, in view of the technical requirements for further reducing the OH content of the optical fiber preform and further reducing the water peak attenuation, under the current technological conditions, the halogenation dehydration method cannot meet the requirements

Method used

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  • Method for producing low water peak optic fiber prefabricated piece
  • Method for producing low water peak optic fiber prefabricated piece

Examples

Experimental program
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Embodiment 4

[0047] Example 4, a cylindrical porous prefabricated core rod loose body made in a conventional manner is placed above the interior of the sintering furnace, and the temperature is kept at about 1200-1300 ° C. At the beginning, it is pre-purged with He with a flow rate of 30 SLPM Porous preform mandrel loose body about 15 minutes. After purging, pass through the desiccant Cl 2 Drying was carried out for 60 minutes. During the flow rate of 0.25SLPM Cl 2 And the He of 20SLPM flows through the sintering furnace; After that, the He purging sintering furnace with the flow rate of 30SLPM for 15 minutes; Then, the deuterium gas (D of 0.4SLPM 2 ) and 3~4SLPM flow through D 2 Carrier gas He (containing D 2 O gas) is passed into the sintering furnace at the same time, together with the He flow of 20 SLPM, the mixed gas is used to purge the preform for more than 60 to 360 minutes; the loose body of the porous preform mandrel is lowered to enter the hot zone of the furnace, and the He...

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Abstract

The production process of the present invention can further lower the OH content in prefabricated optical fiber piece, and includes the steps of preparing loose core rod body, chlorine drying, sintering the core rod body, drawing to form glass core rod, coating with silica layer, drying porous glass prefabricated part and sintering. It features the isotope D-H interchange drying step completed and the secondary chlorine drying step between the chlorine drying step and the core rod body sintering step. The isotope D-H interchange drying step is completed inside the sintering furnace and at least one of D2O gas or D2 is introduced into the furnace. Through the said process, low water peak prefabricated optical fiber piece with light attenuation at 1383 nm wavelength less than 0.32 dB / km may be produced. The process is economic and introduces no excessive environmental pollution.

Description

【Technical field】 [0001] The invention relates to the field of optical fiber, in particular to a method for manufacturing an optical fiber preform. 【Background technique】 [0002] At present, inorganic optical fibers have been widely used in the communication industry. Among them, quartz series optical fibers have become the main body of inorganic optical fibers because of their low optical loss, wide range of applicable light waves, and adaptability to long-distance communication. In recent years, the preparation of silica-based optical fibers has made significant progress, eliminating most of the extrinsic attenuation (except for the absorption of hydroxyl ions) and improving the ability of the optical fiber to transmit usable light, while the attenuation caused by hydroxyl groups has become the overall optical fiber. important factor in attenuation. [0003] On the attenuation spectrum of silica-based optical fibers, there is usually a higher water near the wavelength of...

Claims

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Application Information

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IPC IPC(8): C03B20/00C03B37/012C03B37/018G02B6/00
CPCC03B37/01446C03B2201/22
Inventor 邓海鹰杨军勇吴兴坤陈剑儿玉喜直
Owner HANGZHOU FUTONG COMM TECH CO LTD