KR100795217B1 - The Method of Manufacturing Optical Fiber for Dispersion Management - Google Patents

Abstract

The present invention relates to a method for manufacturing optical fiber for distributed control. More specifically, five or six half-holes in the longitudinal direction of the surface of the vitrified core butt deposited with and without doping germanium (GeCl4) at the center of the core butt are collapsed. After the stretching process, the surface of the vitrified core soot deposits can be processed into 10 or 12 half holes in the longitudinal direction, and then collapsed and stretched to produce a long optical fiber. It is about.

According to the present invention, it is possible to mass-produce an optical fiber having air holes that can freely adjust various dispersion characteristics.

The core hole size can be reduced to about 1.0 ~ 10.0mm while collapsing after processing 2.0 ~ 20.0mm half-hole in core suit sediment, which is inexpensive and simplifies the work process.

Distributed control, optical fiber, air hole, core suit, half hole, base material

Description

Method of Manufacturing Optical Fiber for Dispersion Management

1 is a schematic representation of a primary surface processing process of the vitrified core soot deposits of the present invention.

Fig. 2 is a perspective view of the surface-treated vitrified core soot deposits before collebsing.

Figure 3 is a cross-sectional view of the optical fiber cross-sectional primary layer air hole of the present invention.

4 is a schematic representation of a secondary surface processing process of the vitrified core soot deposits of the present invention.

Fig. 5 is a perspective view of the surface-treated vitrified core soot deposit before collepsing.

Figure 6 is a cross-sectional view of the optical fiber cross-section 1,2 layer air hole of the present invention.

7 is a schematic representation of a tertiary surface finishing process of the vitrified core soot deposits of the present invention.

Fig. 8 is a perspective view of the surface-treated vitrified core soot deposits before collepsing.

9 is a cross-sectional view of the optical fiber cross section 1,2,3 layer air hole of the present invention.

Figure 10 is a cross-sectional view of reducing the optical fiber cross-sectional primary layer of the present invention and increased the tertiary layer.

Figure 11 is a cross-sectional view of increasing the optical fiber cross-sectional primary layer of the present invention and reduced the tertiary layer.

12 is a flow chart showing the optical fiber manufacturing process of the present invention.

<Description of the reference numerals for the main components>

1: core

3: clad

2, 12, 13, 22, 23: air hole

The present invention relates to a method for manufacturing an optical fiber free of dispersion control. More specifically, five or six half-holes in the longitudinal direction of the glass surface of the doped and undoped germanium (GeCl4) at the center of the core suot deposit are processed, followed by collapsing and stretching. The present invention relates to an optical fiber manufacturing method for distributed control that can produce a long optical fiber by processing 10 or 12 half holes in the longitudinal direction, collapsing and stretching the glass surface again.
In the present invention, the "half hole" is defined as a groove formed by surface processing as shown in Figures 1, 4, and 7 as a "half hole", and the "air hole" as shown in Figures 2, 5, and 8 through the half hole through It is changed to an air hole. In other words, it is defined as 'half hole' before the processing of Colebs and 'air hole' after the processing of Colebs.

In a conventional photonic crystal fiber manufacturing method, small tubes are stacked, collapsed and stretched into one tube, and some of these tubes are stacked again, and then collapsed with heating to complete the final preform.

That is, in the related art, several silica tubes are arranged around the silica rod to form a tube bundle, and this time, an over-jacket tube is collapsed to produce an optical fiber. The optical fiber was produced by drilling several air holes directly around the core of the preform.

In the former method, it is difficult to have a neat arrangement of the bundles in the tube, so that the structures can be varied, so that the reproducibility is degraded, and as the microstructure is increased, the reproducibility is deteriorated, and the mechanical strength of the optical fiber is reduced. As the probability of moisture penetration into the molten site increases and the refractive index between core and primary cladding can be eliminated, optical power leaks to the primary cladding.

In the latter method, there may be a problem in the mechanical strength of the optical fiber due to the occurrence of minute cracks depending on the surface roughness of the inner surface of the perforated air hole, and if the distance between the holes or the distance between the hole and the core is close during the drilling operation There is a risk of damage during operation.

According to the prior art related to the present invention, Korean Patent Laid-Open Publication No. 2002-47279 (published on: June 21, 2002 Corning Incorporated) "ring photonic crystal fiber" describes only the concept of holes. Details of the size of the holes, the arrangement of the holes, the characteristics of the arrangement of the holes, the manufacturing method, and the like are not described. In addition, the conventional technology for the air hole is disclosed a technique for processing the hole in the plastic material, it is not disclosed about the arrangement or structure of the air hole.

The present invention has been made in order to overcome the problems of the prior art, the object of the present invention is to solve the structural irregularities of the conventional tube laminated structure, to make an air hole directly in the preform made, increase the effective portion of the base material productivity The present invention provides a method for manufacturing optical fiber for dispersion control free of dispersion control, which improves defects in mechanical strength of an optical fiber by increasing structural characteristics and removing existing non-reproducible structural defects.

It is another object of the present invention to provide a dispersion control optical fiber manufacturing method free of dispersion adjustment by improving the bending characteristics by adjusting the size of the air holes, the hole spacing and the distance between the holes and the core by using the gas injected in the collabs process after processing. It is.

The composition of the present invention for realizing the object of the present invention is flame hydrolysis reaction of glass raw material to silicon dioxide (SiO ₂ ) + germanium dioxide (GeO ₂ ) + metal chloride (or fluorine compound) in the core, silicon dioxide ( Depositing porous glass fine particles on the prepared seed rod by depositing SiO ₂ ) + metal chloride (or fluorine compound); A dehydration step of removing the OH group from the core soot deposit deposited on the seed rod in a furnace containing Cl ₂ (or SiCl ₄ ) gas and a metal chloride (or fluorine compound); Sintering the core oot deposits from which the OH groups have been removed at a suitable temperature to transparent vitrify; Drawing the vitrified core soot deposits to a designed outer diameter to form a core glass rod; If necessary, the core glass rod is etched with distilled water and a hydrofluoric acid mixture (0.5 to 10%), and the hydrolysis reaction is again performed on the outer peripheral portion of the core glass rod to deposit the clad suit. In the method of manufacturing an optical fiber by a conventional VAD method composed of a step,

The vitrified core soot deposit is sintered at an appropriate temperature to transparent vitrify and the vitrified core soot deposit is stretched to a designed outer diameter to form a core glass rod. Making a surface in the longitudinal direction and making a half-hole with a specific size and number; Etching the surface-treated vitrified core soot deposit with distilled water and hydrofluoric acid mixture (0.5-10%); Placing the surface-processed vitrified core soot deposit into a glass tube and adding nitrogen (or helium) to collep to a designed outer diameter to make a base material for optical fiber manufacturing; It is characterized in that it comprises a step of drawing out the optical fiber having a fine air hole.

The core of the vitrified core soot deposit is characterized in that any one of doped with germanium tetrachloride (GeCl ₄ ) and pure silica only.

The dehydration process of removing the OH group present in the optical fiber base material is characterized in that to remove the moisture in the optical fiber core.

In addition, in the process of processing the half holes in a predetermined size and number on the surface of the vitrified core suit deposits, the half hole diameter is about 2-20 mm and six half holes centered on the cores of the vitrified core suit deposits. While having a half hole arrangement on the basis of the center of the base material in the range of 24 degrees to 72 degrees, characterized in that the processing of the adjacent surface spacing of the half holes to 0.1 ~ 10.0mm. If necessary, the surface-treated vitrified core soot deposit is etched with distilled water and hydrofluoric acid mixture (0.5-10%), and the surface-treated vitrified core soot deposit is glass tube. In the process of surface-processing a half hole with a secondary layer on the surface of the base material made by adding a nitrogen (or helium) to the surface of the base material, the diameter of the half hole centered around the core of the vitrified core suit deposit is 2-20 mm. And having 12 half holes, while the arrangement of the half hole on the basis of the center of the base material in the range of 24 degrees to 72 degrees, characterized in that the adjacent surface spacing of the half holes to 0.1 ~ 10.0mm.

In the present invention, several air holes around the core in the glass fiber weaken the cladding refractive index. The weakened cladding refractive index confines the signal light into the core and increases the waveguide dispersion. Multimode transmission is inevitable in order to maintain the core diameter at a specific outer diameter to improve connection characteristics. In order to solve this problem, a multilayer structure is adopted. The mode field diameter (MFD) of 1.55 to 6.2 µm is the same as that of conventional high-numeric optical fiber (HNA), and the bending loss is 0.13 dB / m when bent to 5 mm outer diameter in basic mode. Minimized.

Since the optical fiber manufactured by the present invention is preferably used in a DWDM (Dense Wavelength Division Multiplexing) or CWDM (Coarse Wavelength Division Multiplexing) system, it is claimed as the invention.

An embodiment of the present invention will be described below with reference to the drawings.

1 is a schematic view showing a surface processing process for making a half-hole of a specific size and number in the longitudinal direction of the surface of the vitrified core soot deposits, Figure 2 is a glass tube with a surface finish of the vitrified core soot deposits designed Figure 3 is a perspective view before the collab put, Figure 3 is a cross-sectional view of the first layer air hole cross section of the optical fiber of the present invention made from the base material for the optical fiber designed by the colleb.

Figure 4 is a schematic diagram showing a surface processing process for making a half hole in a specific size and number of surfaces in the longitudinal direction to make a secondary layer in the glass rod made by the first collep, Figure 5 is a glass rod after the secondary surface processing It is a perspective view before the secondary collebs put into the designed glass tube, Figure 6 is a cross-sectional view of the first and second layer air hole cross section of the optical fiber of the present invention made from the base material for the optical fiber designed by the second collebs.

Figure 7 is a schematic diagram showing a surface processing process for making a half hole in a specific size and number of surfaces in the longitudinal direction to make a tertiary layer on the glass rod made by the secondary collebs, Figure 8 is a glass rod after the tertiary surface processing It is a perspective view before the third collebs put into the designed glass tube, Figure 9 is a cross-sectional view of the first and second layers of the optical fiber cross-section of the optical fiber made from the base material for the optical fiber designed by the third collebs.

10 is a cross-sectional view of reducing the air holes of the primary layer and increasing the air holes of the tertiary layer than the secondary layer of the optical fiber cross section of the present invention. 11 is a cross-sectional view of increasing the air hole of the primary layer and reducing the air hole of the tertiary layer than the secondary layer of the optical fiber cross-section of the present invention, Figure 12 is a flow chart showing the optical fiber manufacturing process of the present invention.

1 is a schematic view showing a surface machining process for making a half hole of a specific size and number in the longitudinal direction of the surface of the vitrified core soot deposit.

The present invention grooves in the longitudinal direction the surface of the vitrified core suit deposit prepared in 5 ~ 20mm size of the outer diameter of the half hole using a diamond wheel (wheel).

FIG. 2 is a perspective view of the vitreous core soot deposit after completion of the primary surface treatment before being placed in a designed glass tube and collebs. FIG. After the processing of Figure 1 is put into the vitrified core suot sediment surface-processed in the designed glass tube, the gas is injected into the half-hole passage at high temperature and collapsing to make a glass rod of the desired outer diameter.

At this time, the size of the air hole and the outer diameter of the collapsing glass rod can be controlled by adjusting the heating temperature, annealing time, and gas pressure. Conventionally, since a bundle of several tubes was bonded to a large tube, and then manufactured by heating and collapsing, the structure was inconsistent, resulting in a difference in characteristics and a factor in lowering productivity.

This structure, which consists only of the primary layer of FIG. 3, obtains the characteristics of dispersion through computer simulation, and accordingly, the air hole 2 is moved to the first floor at 60 degrees to 72 degrees around the core 1. R0 = 2.0 ~ 20.0mm of the glass rod surface-treated in Figure 1 to produce ~ 6, D1 / d1 = 3.0 ~ 6.0. Where R0 = the radius of the grooves formed during the surface processing of the glass rod, D1 = the radius of the optical fiber consisting of the primary layer air holes, d1 = the core diameter of the optical fiber consisting of the primary layer air holes, and the radius of the optical fiber consisting of the primary layer air holes / The ratio of core ring. Diamond wheels are used for fiber optic substrate processing.

Figure 4 is a schematic diagram showing a surface processing process for making a half-hole in a specific size and number of surfaces in the longitudinal direction to make a secondary layer in the glass bar made by the first collebs. Diamond wheels are used for machining.

FIG. 5 is a perspective view of the glass rod after the secondary surface processing is placed in a designed glass tube before choleps. Figure 6 is a cross-sectional view of the optical fiber cross-section 1,2 layer air hole of the present invention made from the base material for the optical fiber designed by secondary collebs.

The structure consisting of the first and second layers of FIG. 6 is obtained through computer simulation of dispersion characteristics, and then 60 to 72 degrees around the core 1 according to the results of the high-order mode. R1 = 2.0-20.0mm of the glass rod surface-treated in FIGS. 4 and 6 so that 10 to 12 air holes 12 in two layers may be formed on the surface of the glass rod having 5 to 6 air holes 12 formed in one layer. And D2 / d2 = 3.0 to 6.0. Where R1 = the radius of the grooves during the secondary processing of the glass rod, D2 = the radius of the optical fiber consisting of the first and second layer air holes, d2 = the core diameter of the optical fiber consisting of the first and second layer air holes, and D2 / d2 = 1, the second layer air It is the ratio of the radius of the optical fiber made up of holes / core diameter.

6 is a double-layered air hole structure, a total of 18 air holes (12). As the number of air holes 12 increases, dispersion compensation is variously performed, and according to the distance between the primary layer and the secondary layer, the non-linearity of the high-order-mode progressing from the primary layer to the secondary layer varies. Higher order modes where the power distribution is away from the core 1 may be further affected by the outer layer. If the bending loss is small in the basic mode, the curvature loss may be large in the higher order mode.
The optical fiber characteristics of FIG. 6 are characterized in that the porous core rod is dehydrated and the concentration of hydroxyl groups is 0.8 ppb or less in weight ratio, and the loss value is 0.3 dB / km or less at 1383 ± 3 nm. In the case of manufacturing the optical fiber of FIG. 6, the primary layer is configured to further include a secondary layer having a diameter of 2 to 20 mm and 10 to 12 half holes centered on the core in the base material obtained through the primary collapsing. , The diameter of air hole is 2 ~ 20mm centered on core in the base material which is made by secondary collapsing, and the distance of adjacent hole of half hole is processed to 0.1 ~ 10.0mm while arranging air hole in the range of 24 ~ 72 degree. It is done.
In addition, the diameter of the half hole centering the core on the base material obtained by the secondary collapsing has a diameter of 2 to 20 mm, and the core material formed by the third collapsing having 20 to 24 half holes on the tertiary layer. The diameter of the air hole is 2 ~ 20mm, the space between the adjacent holes of the half hole is characterized in that the processing of 0.1 ~ 10.0mm while arranging the air hole in the range of 24 degrees to 72 degrees. In another embodiment of the present invention, the half-hole diameter of the primary layer is 1.0 to 10 mm, and the half-hole diameter of the secondary layer is 1.5 to 15 mm, or the primary layer and the secondary layer have the same diameter as 1.0 to 15 mm.
In another embodiment of the present invention, the half-hole diameter of the primary layer is 1.5 to 15 mm, and the half-hole diameter of the secondary layer is 1.0 to 10 mm.

Figure 7 is a schematic diagram showing a surface processing process for making a half-hole in a specific size and number of surfaces in the longitudinal direction to make a tertiary layer on the glass rod made by secondary collebs. Diamond wheels are used for machining.

Fig. 8 is a perspective view of the core glass rod after the tertiary surface treatment is put into a designed glass tube before collepsing. The structure of the 1st, 2nd, 3rd layer of FIG. 9 is obtained through computer simulation of dispersion characteristics, and then is 60 to 72 degrees around the core according to the result of the high-order mode. R2 of the surface-treated glass rods of FIGS. 7 and 8 so that 15 to 18 three-layer air holes may be formed on the surface of the glass rod having 5 to 6 layered air holes and 10 to 12 layered air holes. = 2.0 to 20.0 mm, and D3 / d3 = 3.0 to 6.0. Where R2 = the radius of the grooves in the tertiary processing of the glass rod, D3 = 1, 2, the radius of the optical fiber consisting of the third-layer air holes, d3 = the core diameter of the optical fiber consisting of the third, second, and third-layer air holes, D3 / d3 = 1 It is the ratio of the radius / core diameter of the optical fiber composed of the 2nd, 3rd layer air holes.

9 is a cross-sectional view of the optical fiber cross section 1, 2, and tertiary layer air hole 13 of the present invention.

FIG. 9 shows that the air hole 13 arranges the holes from the core 1 at regular intervals and arranges the same hole sizes to uniformly stress the core 1 to improve dispersion or dispersion slope characteristics.
The embodiment of the invention according to Figure 9 is the half-hole diameter of the primary layer is 1.0 ~ 10mm, the half-hole diameter of the secondary layer is 1.5 ~ 15mm, and further comprises a tertiary layer, but the half-hole diameter of the tertiary layer is 2.0 to 20mm or Alternatively, the primary layer, the secondary layer and the tertiary layer is characterized in that it is configured by sequentially combining the same diameter to 1.0 ~ 20mm.
Another embodiment of the invention according to Figure 9 is characterized in that the half-hole diameter of the primary layer is 2.0 ~ 20mm, the half-hole diameter of the secondary layer is 1.5 ~ 15mm and the half-hole diameter of the tertiary layer is 1.0 ~ 10mm.
In the case of manufacturing the optical fiber of Figure 9, the processed core soot deposits are placed in a glass tube for collabs, and nitrogen or helium or deuterium is pressed by 1 to 50 atm along the half-hole surface to prepare an optical fiber, but the optical fiber The size of the primary, secondary and tertiary air holes is 1.0 to 10 mm, the distance between the holes is 1.0 to 10 mm, the distance between the holes and the core is 1.0 to 10 mm, and the outer diameter is 60 to 100 mm. The processed core soot deposits can be mass-produced by collapsing to an outer diameter of 60 to 100 mm while stretching the size of the air holes to the size of the designed air holes.

10 is a cross-sectional view of the optical fiber cross-sectional primary layer and the secondary layer of the present invention is reduced. According to FIG. 10, the half hole 22 is processed to a size of 1.0 to 10 mm in the air hole of the primary layer, and the half hole 22 is processed to be 1.5 to 15 mm in the size of the air hole of the secondary layer.

10 shows that the air holes are arranged to have smaller size holes in the core 1 and the holes having sizes that are sequentially larger than the inside of the air holes are uniformly stressed to the core to improve dispersion characteristics or dispersion slope characteristics. . The more layers of air holes, the more stress is applied to the core part through which light passes, so that the dispersion characteristic has a dispersion value between 0 (zero) and 10 pps / nm / km with a dispersion value ranging from 1100 nm to 1625 nm. The characteristics of 0.03 ps / nm ² km or less can be easily controlled.

FIG. 11 is a cross-sectional view of increasing the cross-sectional primary layer of the optical fiber and decreasing the tertiary layer of the present invention. FIG. According to FIG. 11, the half hole 23 is processed to 1.5-15 mm in size of the air hole of the secondary layer, and the half hole 23 is processed to 1.0-10 mm in size of the air hole of the third layer.
In the embodiment of the present invention, the half-hole diameter is about 2 to 20 mm around the core of the vitrified soot deposit in the process of making a half-hole in a predetermined size and number on the surface of the vitrified soot deposit and making a surface treatment. The primary layer has 5 half holes in the first layer, and the diameter of the half hole is 2 ~ 20mm with the core as the center, and the secondary layer has 10 half holes in the base material. The diameter of the half hole is 2-20mm around the core, and the half-hole is placed in the range of 24 to 72 degrees based on the core center on the base material formed by tertiary collapsing with 20 half holes in the third layer. Adjacent surface spacing of the half hole is characterized in that the processing to 0.1 ~ 10.0mm.
Another embodiment of the present invention is a half-hole diameter of 2 ~ 20mm around the core of the vitrified soot sediment in the process of making a half-hole and a surface treatment in a certain arrangement and a certain number on the surface of the vitrified soot sediment The primary layer has 6 half holes in the first layer, and the diameter of the half holes is 2 ~ 20mm centered on the core. The secondary layer has 12 half holes in the secondary layer. The diameter of the semi-hole is 2 ~ 20mm, centered on core, and the 3rd layer has 24 half-holes in the tertiary layer. It is characterized by processing the adjacent surface spacing of the half-holes to 0.1 ~ 10.0mm.

12 is a block diagram showing a manufacturing process of the present invention. The present invention is flame hydrolysis reaction of the glass raw material to silicon dioxide (SiO ₂ ) + germanium dioxide (GeO ₂ ) + metal chloride (or fluorine compound) in the core, silicon dioxide (SiO ₂ ) + metal chloride (or fluorine compound) in the clad Depositing porous glass fine particles on the prepared seed rod by depositing the particles; A dehydration step of removing the OH group from the core soot deposit deposited on the seed rod in a furnace containing Cl ₂ (or SiCl ₄ ) gas and a metal chloride (or fluorine compound); A step of transparent vitrification by sintering the core soot deposit from which the OH group has been removed at an appropriate temperature; Making a surface of the vitrified core soot deposits in the lengthwise direction and making a half hole and surface treatment; Etching the surface-treated core soot deposits with a mixture of distilled water and hydrofluoric acid (0.5 to 10%); The surface processed core soot deposit is placed in a glass tube, and nitrogen (or helium) is added to colleps the designed outer diameter to make a base material for optical fiber manufacturing, and it is composed of thinner optical fibers.

That is, by improving the method of manufacturing the optical fiber by the conventional VAD method, the step of transparent vitrification by sintering the core soot deposits at an appropriate temperature, and stretching the vitrified core soot deposits to the designed outer diameter core glass Making a half hole and surface-treating the surface of the vitrified core soot deposit in a longitudinal direction in the middle of the rod making process; Etching the surface-treated vitrified core soot deposit with distilled water and hydrofluoric acid mixture (0.5-10%); Placing the surface processed core soot deposit into a glass tube and adding nitrogen (or helium) to colleps the designed outer diameter to form a base material for manufacturing an optical fiber free of dispersion control; It is characterized in that it comprises a step of drawing out the optical fiber having a fine air hole.
The optical fiber produced by the present invention has a dispersion property between 1100 nm wavelength and 1625 nm wavelength, with a dispersion characteristic of 0 to 10 ps / nm / km, and a dispersion slope of 0 to 0.05 ps / nm2.km or 0.05 to 0.10 ps / nm ² .km and while maintaining the loss is 0.4dB / km or less, characterized in that the loss is less than 0.3dB / km at a loss in the 1383nm 3.0dB / km or less, 1550nm at 1310nm.
The core of the vitrified soot deposit is characterized in that it is one of doped with germanium tetrachloride (GeCl ₄ ) and pure silica alone.
The OH group is removed and the concentration of hydroxyl groups is 0.8 ppb or less by weight ratio, and the loss value is 13 dB ± 3 nm or less is characterized in that less than.

The optical fiber of the present invention can control light while minimizing transmission loss by air-hole and has good productivity, and thus it can be applied to various fields such as Dense Wavelength Division Multiplexing (DWDM) or Coarse Wavelength Division Multiplexing (CWDM). have.

As described above, according to the present invention, it is possible to mass-produce an optical fiber having air holes that can freely adjust various dispersion characteristics.

The core hole size can be reduced to about 1.0 ~ 10.0mm while collapsing after processing 2.0 ~ 20.0mm half hole in core suit sediment, so it is inexpensive and simplifies the work process.

In addition, by removing the peak of water in the 1383 ± 3 nm wavelength, the loss value is better than the conventional optical fiber and can be used at any wavelength, making the simple and low-cost optical fiber available in a wide range in many applications. It is possible to implement a method for producing a base material for optical fibers having a plasticity and low water peak.

Claims (16)

Flame-hydrolyze the glass raw material to deposit silicon dioxide (SiO2) + germanium dioxide (GeO2) + metal chloride (or fluorine compound) on the core, and silicon dioxide (SiO2) + metal chloride (or fluorine compound) on the clad. Depositing the fine particles on the prepared seed rod; A dehydration step of removing the OH group from the core soot deposit deposited on the seed rod in a furnace containing Cl 2 (or SiCl 4) gas and a metal chloride (or fluorine compound); Sintering the core oot deposits from which the OH groups have been removed at a suitable temperature to transparent vitrify; Drawing the vitrified core soot deposits to a designed outer diameter to form a core glass rod; If necessary, the core glass rod is etched with distilled water and a hydrofluoric acid mixture (0.5 to 10%), and the hydrolysis reaction is again performed on the outer peripheral portion of the core glass rod to deposit the clad suit. In the method of manufacturing an optical fiber by a conventional VAD method composed of a step, The vitrified core soot deposit is sintered at an appropriate temperature to transparent vitrify and the vitrified core soot deposit is stretched to a designed outer diameter to form a core glass rod. Making a surface in the longitudinal direction and making a half-hole with a specific size and number; Etching the surface-treated vitrified core soot deposit with distilled water and hydrofluoric acid mixture (0.5-10%); Placing the surface-processed vitrified core soot deposit into a glass tube and adding nitrogen (or helium) to collep to a designed outer diameter to make a base material for optical fiber manufacturing; Dispersion control optical fiber manufacturing method comprising the step of drawing out the optical fiber having a fine air hole. According to claim 1, by reacting the glass raw material flame hydrolysis core is silicon dioxide (SiO ₂₎ + germanium dioxide (GeO ₂₎ + metal chloride (or fluoride), the clad has a silicon dioxide (SiO ₂₎ + metal chloride (Or a fluorine compound) in the process of depositing the porous glass fine particles on the prepared seed rod, the core is any one of doped with germanium tetrachloride (GeCl4) doped only pure silica. . The method of claim 1, wherein the OH group in the dehydration process to remove the OH group in the furnace in the atmosphere containing the Cl ₂ (or SiCl ₄ ) gas and metal chloride (or fluorine compound) deposited on the seed rod. Dispersion, the concentration of the hydroxyl groups to 0.8ppb or less by weight ratio, and the loss control value of 0.3dB / km or less at 1383 ± 3nm, characterized in that the optical fiber manufacturing method for distributed control. 2. The vitrified core of claim 1, wherein the cored soot deposit is sintered at an appropriate temperature to transparent vitrify and the vitrified core soot deposit is drawn to a designed outer diameter to form a core glass rod. In the process of making half-holes and surface treatment of the surface of the soot sediment with a specific size and number in the longitudinal direction The half-hole diameter is about 2 to 20mm around the core of the vitrified soot sediment in the process of making a half-hole in a predetermined size and number on the surface of the vitrified soot sediment, and treating the surface. The diameter of the half-hole is 2 ~ 20mm around the core on the base material with the first half-collaps with two half-holes, and the half is centered around the core on the base material with the second collapsing with ten half-holes on the second layer. The diameter of the hole is 2 ~ 20mm, and the third layer has 20 half holes, and the base hole from the third collapsing has a half hole arrangement in the range of 24 degrees to 72 degrees based on the core center. Dispersion control optical fiber manufacturing method characterized in that the processing to 0.1 ~ 10.0mm. delete The optical fiber for dispersion control according to claim 4, wherein the half-hole diameter of the primary layer is 1.0 to 10 mm, the half-hole diameter of the secondary layer is 1.5 to 15 mm, or the primary layer and the secondary layer have the same diameter of 1.0 to 15 mm. Manufacturing method. The method of claim 4, wherein the half-hole diameter of the primary layer is 1.5 to 15 mm, and the half-hole diameter of the secondary layer is 1.0 to 10 mm. The method according to claim 4, wherein the half-hole diameter of the primary layer is 1.0 to 10mm, the half-hole diameter of the secondary layer is 1.5 to 15mm, and further comprises a tertiary layer, but the half-hole diameter of the tertiary layer is 2.0 to 20mm or the primary layer. , The secondary layer and the tertiary layer is 1.0 to 20mm, the optical fiber manufacturing method for distributed control, characterized in that configured by sequentially combining the same diameter. The method of claim 8, wherein the half-hole diameter of the primary layer is 2.0 to 20mm, the half-hole diameter of the secondary layer is 1.5 to 15mm, and the half-hole diameter of the tertiary layer is 1.0 to 10mm. The method of claim 1, wherein the cored spouted body collapsed in the process of placing the surface-treated vitrified coredock deposit in a glass tube and collebs to a designed outer diameter by adding nitrogen (or helium) to make a base material for optical fiber manufacturing. Put nitrogen or helium or deuterium in the glass tube for 1 ~ 50 atm along the half-hole surface and collapsing to manufacture the optical fiber, the size of the air hole of the first, second and third layers of the optical fiber is 1.0 ~ 10mm, the distance between holes Is 1.0 ~ 10mm, the distance between the hole and the core is 1.0 ~ 10mm, the outer diameter is 60 ~ 100mm manufacturing method of the optical fiber for distributed control. 11. The method of claim 10, wherein the cored suture deposits in the process of preparing a base material for fiber manufacturing by collapsing the surface-treated vitrified core suture deposits into a glass tube and adding nitrogen (or helium) to a designed outer diameter. Dispersion control optical fiber manufacturing method characterized in that the collapsing to the outer diameter of 100mm to draw the mass of the size of the air hole to the size of the designed air hole while stretching and mass production. The optical fiber manufactured by the optical fiber manufacturing method of claim 1 has a dispersion property between 1100 nm wavelength and 1625 nm wavelength, with a dispersion characteristic of 0 to 10 ps / nm / km, and a dispersion slope of 0 to 0.05 ps / nm ² .km or 0.05 ~ 0.10ps / nm ² .km the branches while the loss at 1310nm 0.4dB / km or less and a dispersion of the loss control features that 0.3dB / km or less in the loss at 1383nm 3.0dB / km or less, 1550nm Optical fiber manufacturing method. delete delete The optical fiber manufacturing method according to claim 1, wherein the optical fiber manufactured by the optical fiber manufacturing method is used in a dense wavelength division multiplexing (DWDM) or coarse wavelength division multiplexing (CWDM) system. The method of claim 5, wherein the secondary collapsing base material has a diameter of a half hole 2-20mm around the core, and the third layer further comprises 20 to 24 half holes, and the third collabs The diameter of the air hole is 2 ~ 20mm centered on the core and the air hole is placed in the range of 24 ° to 72 ° while the adjacent surface spacing of the half hole is processed to 0.1 ~ 10.0mm. Way.

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