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Optical fiber eat treatment method and device

A technology of heat treatment device and heat treatment method, applied in glass manufacturing equipment, glass production, manufacturing tools, etc., can solve the problem of unspecified holding time and holding furnace temperature setting, unspecified length of temperature zone, optical fiber processing time, complicated application, etc. problem, to achieve the effect of reducing Rayleigh backscattering loss, reducing small density changes, and reducing attenuation coefficient

Active Publication Date: 2014-04-09
长飞光纤潜江有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN1318337 describes a method for manufacturing an optical fiber. In this method, the cooling rate is below 2000°C / s, and the temperature of the heat treatment furnace is above 800°C and below 1600°C to heat-preserve and anneal the optical fiber, but does not specifically describe the holding time and temperature setting of the holding furnace
Chinese patent CN100336753 describes a method of manufacturing an optical fiber, which includes cooling the optical fiber at a cooling rate of 830°C / sec to 4000°C / sec, the heat treatment temperature ranges from 1100°C to 1500°C, and the processing time is between 0.025 sec and 0.5 seconds, this method requires the application of a complex muffle furnace system filled with inert gas, which is costly
Chinese patent CN100453483 describes a method of manufacturing an optical fiber, which includes cooling the optical fiber at a cooling rate of 2000°C / s to 3500°C / s, and setting the heat treatment regions to different temperatures, and the first The temperature range of the zone is 1100°C to 1300°C, and the second downstream zone has a temperature in the range of 1400°C to 1600°C. The method does not specify the length of each temperature zone and the processing time of the optical fiber in each temperature zone

Method used

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  • Optical fiber eat treatment method and device
  • Optical fiber eat treatment method and device
  • Optical fiber eat treatment method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The fiber corresponding to Example 1 is a core rod prepared by the PCVD method, and a germanium-fluorine-doped matched-clad single-mode fiber with the cladding prepared by the OVD method. The length and temperature parameters of the holding furnace are chosen such that the temperature of the fiber is maintained at the desired temperature for a period of time. Specifically, the furnace chamber of the holding furnace is divided into two temperature-controlled areas, each with a length of 1 m; the temperatures in the first area and the second area are 850°C and 1050°C, respectively. The drawing speed is set at 1300m / min, the total residence time of the optical fiber in the holding furnace is about 0.09s, and the residence time in each temperature-controlled area is about 0.045s. The surface temperature of the optical fiber entering the holding furnace is 1476°C, and the surface temperature of the optical fiber leaving the holding furnace is 1156°C. The average cooling rat...

Embodiment 2

[0029]The optical fiber corresponding to Example 2 is a core rod prepared by PCVD method, and a germanium-fluorine-doped matched-clad single-mode optical fiber whose cladding is prepared by OVD method. The drawing speed is set at 1500m / min, and the temperature at which the optical fiber enters the holding furnace is 1511°C. The length and temperature parameters of the holding furnace are chosen such that the temperature of the fiber is maintained at the desired temperature for a period of time. Specifically, the heat zone of the holding furnace is divided into 3 zones, and the length of each zone is 1m; the temperatures in the first zone to the third zone are 800°C, 950°C, and 1050°C, respectively. In this way, the total residence time of the optical fiber in the holding furnace is about 0.12s, and the residence time in each hot zone is about 0.04s. The surface temperature of the optical fiber when it leaves the holding furnace is 1163°C. The average cooling rate in the hold...

Embodiment 3

[0033] The optical fiber corresponding to Example 3 is a core rod prepared by PCVD, and a germanium-fluorine-doped matched-clad single-mode optical fiber whose cladding is prepared by OVD. The drawing speed is set at 1800m / min, and the temperature at which the optical fiber enters the holding furnace is 1564°C. The length and temperature parameters of the holding furnace are chosen such that the temperature of the fiber is maintained at the desired temperature for a period of time. Specifically, the heat zone of the holding furnace is divided into 3 zones, and the length of each zone is 1m; the temperatures in the first zone to the third zone are 750°C, 950°C, and 1050°C, respectively. In this way, the total residence time of the optical fiber in the holding furnace is about 0.1s, and the residence time in each hot zone is about 0.033s. The surface temperature of the optical fiber when it leaves the holding furnace is 1158°C. The average cooling rate in the holding furnace i...

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Abstract

The invention relates to optical fiber heat treatment method and device. In the method, a maintaining furnace for thrilling the optical fibers is set to perform temperature-preservation heat treatment on optical fibers which are drawn from a fiber drawing furnace and in a high temperature and uncooled state; the temperatures of the optical fibers entering and removing from the maintaining furnace are respectively controlled to be 1400 DEG C-1800 DEG C and 1145 DEG C-1170 DEG C; the optical fibers thrill through the maintaining furnace for 0.08s-0.24s; and the temperature of the chamber of the maintaining furnace is controlled between 600 DEG C and 1300 DEG C. The maintaining furnace has a heat preservation effect on the cores of the optical fibers, the stay time of the optical fibers in an annealing temperature range is prolonged, the internal stress of the optical fibers is relieved, and the Rayleigh back scatter loss is reduced. The maintaining furnace has the advantages of simple structure and reliable performance; the inner chamber of the furnace is directly communicated with ambient air, which avoids the disturbance of protective gas in a drawing channel to the optical fibers, and thus, the stability of high-speed drawing is improved; and the equipment is simplified, and the cost is saved.

Description

technical field [0001] The invention relates to a heat treatment method and device for an optical fiber, in particular to a method and a heat treatment device for a quartz glass optical fiber, which are used to further improve the performance of the optical fiber. Background technique [0002] Attenuation and sensitivity to thermal stress are key characteristics of optical fibers, especially for high-speed long-distance communication fibers. The attenuation of the working window wavelength of the optical fiber between 600nm and 1600nm mainly comes from Rayleigh scattering. When light is incident on an inhomogeneous medium, the medium produces scattered light due to the inhomogeneous refractive index. The irregular thermal movement of molecular particles in the medium destroys the fixed positional relationship between molecules, which also produces a kind of molecular scattering, that is, Rayleigh scattering. The intensity of Rayleigh scattering is greatly affected by dopan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B37/025
CPCY02P40/57
Inventor 吴仪温李江钱新伟曹蓓蓓
Owner 长飞光纤潜江有限公司
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