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Preparation die for polymer optical fiber prefabricated bar and preparation method for the prefabricated bar

A technology of optical fiber preform and polymer, which is applied in the direction of cladding optical fiber, household appliances, optical components, etc. It can solve the problems of easy introduction of air bubbles between the core layer and the cladding layer, rough cladding core boundary, and difficulty in achieving single-mode fiber, etc. problems, to achieve the effect of good chemical stability and heat resistance of the material, smooth surface and time saving

Inactive Publication Date: 2009-10-28
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 1996, the United States "Journal of Lightwave Technology" (Journal of Lightwave Technology, 1996, 14 volumes 2215-2223) mentioned two methods for preparing single-mode step-type polymer optical fiber preforms. One is the "rod tube" technology. The produced rod is too thick and it is difficult to achieve single-mode optical fiber, and it is easy to introduce air bubbles between the core layer and the cladding; the second is the "hole rod" technology, that is, to drill A small hole is poured into the monomer, and then polymerized, so the cladding core boundary is not smooth, resulting in additional scattering loss
Chinese patent 200710019785.7 provides a method for preparing a few-mode or single-mode copolymer doped optical fiber preform, but since a hard test tube is used as a container, in order to avoid the generation of bubbles during the polymerization process, the raw material solution needs to be pre-polymerized and then Grouting, which is not conducive to the doping of other functional materials, and it is easy to cause voids or surface dents in the product

Method used

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  • Preparation die for polymer optical fiber prefabricated bar and preparation method for the prefabricated bar
  • Preparation die for polymer optical fiber prefabricated bar and preparation method for the prefabricated bar
  • Preparation die for polymer optical fiber prefabricated bar and preparation method for the prefabricated bar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1 Preparation of step-type azo-doped single-mode polymer optical fiber preform

[0048] (1) Preparation and installation of reaction molds for polymer optical fiber preforms

[0049] Such as figure 1 As shown, a pressure-resistant fluoroplastic tube 2 with a length of about 30 cm is used as a polymerization container, and its lower end is closed with a nut-screw structure 1, and one end of a Teflon rope (polytetrafluoroethylene rope) 3 is fixed in the center. The Teflon rope is about 25cm long and has an original diameter of 0.84mm. After one end is fixed at the lower end of the polymerization container, it is stretched moderately so that the Teflon rope reaches a sufficient length to pass through the total length of the pressure-resistant fluoroplastic tube 2 and its top cover 4 . Fix the other end of the Teflon rope to the center of the pre-cover by using a nut-screw structure, so that the Teflon rope is straightened and fixed on the axis of the pressure-resi...

Embodiment 2

[0064] Example 2 Using the preform obtained by the preparation method provided by the present invention to make an optical fiber

[0065] The step-type azo-doped single-mode polymer optical fiber preform obtained in Example 1 was used to draw it into an optical fiber with a fiber drawing machine. The drawing temperature is 120°C, and the core diameter of the optical fiber is controlled by adjusting the ratio of feeding speed and pulling speed. The characteristic fiber diameter is 183 μm, the core is 17 μm, and the refractive index difference between the cladding layer and the core layer is 0.0054. It can be seen that the fiber is single-mode at 1550 nm. (Such as figure 2 shown)

Embodiment 3

[0066] Embodiment 3 utilizes the reaction mold provided by the present invention to carry out batch production

[0067] The preparation of the reaction mold for the polymer optical fiber preform is the same as in Example 1.

[0068] Such as image 3As shown, several branch pipes 10 come out from the main pipe 5; branch valves 12 are installed on each branch pipe 10, and the lower end of the branch valve 12 is connected with the hole on the reaction mold top cover 4 of the polymer optical fiber preform. Several branch pipes are separated from the main pipe 5 to facilitate batch preparation, and polymer optical fiber preforms with different doping conditions or different proportions can be prepared by controlling the opening of each branch valve.

[0069] Other experimental conditions and processes are the same as in Example 1.

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Abstract

The invention provides a reaction die for a polymer optical fiber prefabricated bar, which includes a non-rigid polymerization container with closed lower end, a removable top cover and a tense polytetrafluoroethylene rope or metal wire, wherein the top cover is provided with a hole which makes an inner cavity of the polymerization container communicated with outside, circumference of the top cover is closely combined with the polymerization container, the polytetrafluoroethylene rope or metal wire is arranged at axle center of the polymerization container and penetrates overall length of the polymerization container. The reaction die has simple structure, and is suitable for industrial popularization. The invention also provides a method for preparing the polymer optical fiber prefabricated bar by using the reaction die. The method has simple operation, and is easy for industrial use, the prefabricated bar prepared by the method has flattening surface, less bubble, obvious fiber core cladding boundary and controllable diameter, is easy to be drawn to form fiber and realize doping to prepare various functional optical fiber prefabricated bar.

Description

technical field [0001] The invention relates to the preparation technology of polymer optical fiber, in particular to the preparation mold and method of few-mode and single-mode polymer optical fiber preform rods. Background technique [0002] Since the appearance of polymer optical fiber in 1968, its development and application have developed rapidly. At present, there are four main manufacturing methods of polymer optical fiber: preform rod drawing method, batch extrusion method, continuous extrusion method and melt spinning method. Among them, the prefabricated rod drawing method is widely used, and the primary key to the application of this method is to prepare a suitable preformed rod. [0003] During the preparation of the preform, it is necessary to avoid the generation of air bubbles due to the autoacceleration effect during the polymerization process. For this reason, it is necessary to pre-polymerize the raw material liquid; or apply a certain pressure to the rea...

Claims

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Application Information

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IPC IPC(8): B29C33/44B29C43/58B29D11/00C08L33/12G02B6/02
Inventor 罗艳华武文轩苏伟田秀杰严青王鑫韩阔吴思章州舜张其锦
Owner UNIV OF SCI & TECH OF CHINA
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