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

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

Example Embodiment

[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 vessel, the lower end of which 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 25 cm long and has an original diameter of 0.84 mm. After one end is fixed to the lower end of the polymerization vessel, it is stretched appropriately so that the Teflon rope reaches a sufficient length to pass through the total length of the pressure-resistant fluoroplastic tube 2 and the top cover 4 thereof. A nut-screw structure is used to fix the other end of the Teflon rope to the center of the pre-cover, so that the Teflon rope is stretched straight and fixed to the axis of th...

Example Embodiment

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

[0065] Using the step-type azo-doped single-mode polymer optical fiber preform obtained in Example 1, it was drawn 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 the feeding speed and the pulling speed. The characteristic fiber diameter is 183μm, the core is 17μm, and the refractive index difference between the cladding and the core is 0.0054. It can be seen that this fiber is single-mode at 1550nm. (Such as figure 2 Shown)

Example Embodiment

[0066] Example 3 Mass production using the reaction mold provided by the present invention

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

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

[0069] Other experimental conditions and procedures 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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