CN1271334A - Draw constant downfeed process - Google Patents
Draw constant downfeed process Download PDFInfo
- Publication number
- CN1271334A CN1271334A CN98809377A CN98809377A CN1271334A CN 1271334 A CN1271334 A CN 1271334A CN 98809377 A CN98809377 A CN 98809377A CN 98809377 A CN98809377 A CN 98809377A CN 1271334 A CN1271334 A CN 1271334A
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- China
- Prior art keywords
- speed
- optical fiber
- send
- district
- wire drawing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/0253—Controlling or regulating
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/06—Rotating the fibre fibre about its longitudinal axis
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/40—Monitoring or regulating the draw tension or draw rate
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/42—Drawing at high speed, i.e. > 10 m/s
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/44—Monotoring or regulating the preform feed rate
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/60—Optical fibre draw furnaces
- C03B2205/72—Controlling or measuring the draw furnace temperature
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
Optical fiber (14) is drawn from a preform (10) that is fed to a furnace at a constant downfeed rate. The optical fiber (14) is drawn by a tractor (20) at a rate of at least 10 meters per second and the tractor (20) is allowed to vary the draw speed of the fiber (14) based on the fiber diameter as measured by a diameter monitor (15) during the draw processing in order to maintain a relatively constant fiber diameter. Maintaining the preform downfeed rate constant even at high draw rates in excess of 20 meters per second does not adversely effect the draw process and is believed to reduce or eliminate oscillations in the draw control loop that can cause variations in the core shape during fiber formation, resulting in reduced PMD and improved MFD uniformity.
Description
Invention field
The present invention relates to optical fiber, relate in particular to by preform drawing optical fiber method, this method makes optical fiber present more uniform mode field diameter (MFD), and has reduced polarization mode dispersion (PMD).
Background of invention
In the optical fiber manufacturing processed, make the glass core prefabricated rods, prefabricated rods generally comprises SiO
2, its axial portions is mixed such as GeO
2Deng compound, in order to improve specific refractory power.When glass preform is pulled out optical fiber, doped region will form light transmission part or fibre core.
Above-mentioned technology is well-known in the art, is not described in detail here.In order to obtain optical fiber, glass preform or blank be sent in the fiber drawing furnace that is heated to temperature of fusion, and a droplet glass comes off from the blank root with towing optical fiber.Optical fiber is sent into tractor and capstan winch assembly, and this assembly is pulled out optical fiber from blank, and with optical fiber on bobbin.
When with the blank drawing optical fiber, blank is sent into fiber drawing furnace, and the fibre diameter of looking over one's shoulder.Generally control the diameter of optical fiber by some operating parameters that changes wire-drawer-tower.Typically, a fibre diameter measuring apparatus is installed, in order to the measuring optical fiber diameter under stove exit.The diameter and the specific diameter value that record are compared, and produce a signal,, perhaps reduce pulling speed (thereby increasing fibre diameter) so that increase pulling speed (thereby dwindling fibre diameter)
At the twentieth century seventies and whole the mid-80, the blank that drawing optical fiber is used is less relatively.Drawing speed is no more than about per second 8 or 9 meters.Because blank dimension and used drawing speed keep furnace temperature relative with the blank speed of feed constant by changing pulling speed, just the may command fibre diameter.
At twentieth century the mid-80, developed a kind of new process control method, this method is the result who as far as possible increases drawing speed.Specifically, when drawing speed reached 10 meter per seconds, those skilled in the art can abandon using under the constant and send speed.More particularly, it is believed that and to realize suitable control down higher drawing speed (be speed reach and surpass 10 meter per seconds), must adopt cascade or two-stage process control method, thereby can respond the speed that changes drawing speed and blank is sent into fiber drawing furnace downwards to representing the error signal that the fine diameter of reality or institute's photometry is not equal to required diameter.For example, if the fine diameter of institute photometry greater than required fibre diameter, Controlling System will increase pulling speed so, reduce the speed that blank is sent into fiber drawing furnace simultaneously.This control viewpoint has reflected such idea, promptly when with greater than the speed operation drawing optical fibers technology of 8-9 meter per second the time, must change under the blank when changing drawing speed and send speed, so that keep than the constant fibre diameter.
Although this two-stage CONTROL PROCESS makes the fibre diameter substantially constant, have been found that this operating method can produce other adverse influence.It is believed that the vibration of wire drawing control loop specifically, is sent the vibration of speed under the blank, can change the shape of fibre core at the optical fiber shaping.This blank root at following delaying optical fiber is obvious especially.It is believed that when when the blank root forms fibre core, the vibration of blank root in stove can influence the shape of fibre core, and can cause PMD relatively poor, MFD is inhomogeneous.
For the optical fiber that uses in telecommunications is used, PMD should be as much as possible little, and it is even that MFD should keep as much as possible.Having proposed plurality of proposals addresses the above problem.For example, transfer the assignee of the present invention jointly and No. the 08/858th, 836, the U.S. Patent application that awaits the reply jointly and PCT application PCT/US97/02541 have disclosed and make the optical fiber rotation so that the whole bag of tricks and the equipment of reduction PMD when wire drawing.The asymmetry that the way of spin fiber makes the geometry of inside of optical fibre and/or stress during wire drawing is rotated around fiber axis along the length direction of axle; But spin fiber can not solve the basic problem that causes PMD in the glass, and rotation can not be eliminated PMD fully, perhaps solves the homogeneity question of MFD.
In view of these shortcomings of this area, be desirable to provide and a kind ofly when reducing PMD, can keep or improve the inhomogeneity method of MFD.When with higher drawing speed (that is) drawing optical fiber, obviously need this method greater than 10 meter per seconds.Because higher drawing speed can make the following of root send vibration to increase, thereby the PMD of optical fiber is increased.
Summary of the invention
Therefore, the present invention aims to provide a kind of optical fiber high-speed wire-drawing method, and this method can be alleviated the one or more problems that produce because of the limitation of related art and shortcoming.Major advantage of the present invention is to provide a kind of wire drawing fibre diameter of controlling when high speed pulling optical fiber to reduce fiber PMD simultaneously and keep the MFD uniform method.Described method comprises that high speed pulling optical fiber keeps sending speed constant under the blank simultaneously.Believe and send speed can avoid the blank root in stove, to vibrate under the constant that this vibration can cause core shape to change at the optical fiber shaping.And the change of core shape can make the PMD and the MFD variation of finished product optical fiber.
In order to obtain these and other advantage, and according to purpose of the present invention, as enforcement and broadly described, the present invention is a kind of method that is used for reducing the polarization mode dispersion of wire drawing optical fiber, and this method may further comprise the steps: send in the stove to fix the preform that send speed will have pre-sizing in advance; Drawing speed with at least 10 meter per seconds is pulled out optical fiber from preform; And the change drawing speed, so that keep fibre diameter constant substantially, the following speed of sending that maintenance simultaneously is scheduled to is constant.Best, drawing speed is greater than 14 meter per seconds, and is then better greater than 20 meter per seconds.
In a preferred embodiment, down send speed constant for the drawing speed of first district or first scope, then for the drawing speed of second district or second scope, time send speed to change into another and different send speed under constant.When drawing speed changes in each district, send speed in each district, to remain unchanged down.In addition, for each district, the following speed of sending can be different.Present method can also comprise the steps, promptly when drawing speed when a district changes to another district with higher drawing speed, send speed to reduce down; Perhaps when drawing speed changes to another district with low drawing speed from a district, send speed to increase down.The step of spin fiber when the present invention can also be included in wire drawing, this can further reduce PMD.
According to another embodiment of the present invention, a kind of method that is used for pulling out from preform optical fiber is provided, this method may further comprise the steps: send in the fiber drawing furnace with the preform that send speed will have pre-sizing under the constant; Drawing speed with at least 10 meter per seconds is pulled out optical fiber from preform.Present method also comprises the steps: to measure the diameter of wire drawing optical fiber, and produces the signal that expression records diameter; The signal and the nominal fibre diameter that are produced are compared.Produce expression and also change drawing speed, thereby regulate the wire drawing fibre diameter with this signal than second signal than difference.Present method also comprises the steps: to be the sensing drawing speed, so that judge that it is whether in a predetermined speed district; And if the drawing speed that senses will send speed to become another predetermined speed down outside described district so.Sending speed down is constant for the drawing speed of first district or first scope, for the drawing speed of second district or second scope, send speed to become under another constant down and send speed then.Best, send speed in each district, to remain unchanged down, and when drawing speed changes between a plurality of districts, send speed to do corresponding the variation down.The step of spin fiber in the time of can also being included in wire drawing according to the method for this embodiment.
Should be appreciated that above-mentioned general description and following detailed description all are to give an example with illustrative, the present invention that they attempt claims are limited is further explained.
Summary of drawings
Fig. 1 is the synoptic diagram of drawing optical fibers equipment.
Describe in detail
The present invention aims to provide a kind of method that is used to reduce the polarization mode dispersion of wire drawing optical fiber.This method will have the preform of predetermined size and send into stove with the predetermined following speed of sending.Best, send speed constant under in whole drawing process, keeping, so that make the vibration minimum of prefabricated rods root in stove, thereby keep MFD even, and reduce the PMD of wire drawing optical fiber.
Fig. 1 shows well-known drawing optical fibers system, represents with label 1 usually.Prefabricated rods 10 vertically is placed in the retort furnace 11 of fiber drawing furnace.Prefabricated rods 10 comprises one handle (not shown), and it links to each other with bracing or strutting arrangement (not shown) by known method.Bracing or strutting arrangement is the part of prefabricated rods feeding driving mechanism 22, and feeding driving mechanism 22 control prefabricated rods 10 are sent the speed of stove to.Heating unit 12 provides heat at least the bottom of prefabricated rods 10.Temperature regulator 49 is controlled the temperature of heating unit 12 in a known manner.After having used well-known starting process, prefabricated rods feeding driving mechanism 22 is sent prefabricated rods 10 to stove.When prefabricated rods 10 is sent to stove, the end of prefabricated rods 10 (being commonly referred to as root) fusing, and tractor 20 from prefabricated rods 10 root 13 pull out optical fiber 14.
After optical fiber 14 left retort furnace 11, by diameter monitor 15, monitor 15 produced a signal, and feedback control loop uses the speed of this Signal Regulation tractor 20 and prefabricated rods feeding driving mechanism 22, and passed through the temperature that temperature regulator 49 is regulated stoves.Behind the optical fiber 14 process diameter watch-dogs 15, by cooling tube 17 and applicator 18, applicator 18 supercoat that one deck is curable is coated on the optical fiber 14.Coated fiber can also pass through coating curing equipment, passes through additional applicator (not shown) when needing again.Feedback control to prefabricated rods feeding driving mechanism 22, tractor drives device 21 and temperature regulator 49 can realize with known control algolithm.Provide an input to tractor drives device 21, this is imported from control algolithm 48, and control algolithm 48 is parts of wire drawing control computer 47.For the requirement of optical fiber, it is useful moving tractor 20 with the speed of at least 10 meter per seconds.Tractor should produce the drawing speed greater than 10 meter per seconds, and preferably can produce the drawing speed greater than 20 meter per seconds.
The present invention aims to provide a kind of method that is used to reduce the polarization mode dispersion of wire drawing optical fiber, and this method comprises the steps, is about to send into glass preform, and to pull out optical fiber greater than the speed of 10 meter per seconds.Can measure the size of prefabricated rods 10 by weight or its diameter.Select the following speed of sending of prefabricated rods 10 according to the size of prefabricated rods 10.Best, in case selected, send speed just in whole optical fiber drawing process, to remain unchanged down.Another kind method is to send speed to remain unchanged in predetermined drawing speed district or scope down.Can have any a plurality of drawing speeds district, and the drawing speed scope in each district can change also.But each district has the relative speed of sending of fixing in advance, and under send speed in each given area, to remain unchanged.
If the wire drawing speed by 21 controls of tractor drives device increases or reduces a given zone that has exceeded drawing speed, control algolithm 48 is sent signal to prefabricated rods feeding driving mechanism 22 so, so that will send speed to change over the suitable following speed of sending to this specific drawing speed district down.Set up control algolithm 48, when changing to another district from a district, send speed to change small incremental down, up to reaching the predetermined following speed of sending with convenient pulling speed.If pulling speed will be returned the region of initiation suddenly, this will allow down to send speed to regulate rapidly and get back to raw velocity so.
According to a further aspect in the invention, this method can also comprise the steps, i.e. sensing drawing speed judges that it is whether in predetermined speed district, if the drawing speed that senses send speed under outside the speed district, changing so.In this embodiment, drawing speed transmitter (not shown) continuous monitoring drawing speed in wire drawing control computer 47.If drawing speed changes to another district from a district, control algolithm is sent signal to prefabricated rods feeding driving mechanism 22 so, so that will send the speed increase down or be reduced to the predetermined constant speedpump relevant with this drawing speed district.
Method of the present invention is further comprising the steps of, promptly in response to the fibre diameter that measures, changes drawing speed, so that keep fibre diameter constant substantially when sending speed constant keeping fixing in advance.In order to keep fibre diameter constant, through diameter monitor 15 monitoring optical fiber 14 commonly used.Diameter monitor 15 produces the signal of the fine diameter of expression institute photometry.This signal is sent to wire drawing control computer 47.In wire drawing computer 47, measured signal and predetermined nominal fibre diameter value are made comparisons.Poor according between fine diameter value of institute photometry and the nominal value produces second signal.Second signal is sent to tractor drives device 21, and change pulling speed, to keep fibre diameter constant.This process per minute will carry out hundreds of, and in whole drawing process, send speed to remain unchanged during all scopes of pulling speed down.
Spin fiber also is useful when wire drawing.Proved that spin fiber can further reduce PMD.Develop the whole bag of tricks and equipment, be used for when wire drawing, making the optical fiber rotation.In order to understand the method and apparatus that is used for spin fiber in more detail, can be with reference to the U.S. Patent application the 08/858th that transfers present assignee jointly and await the reply jointly, No. 836 and the 08/784th, No. 574, PCT application PCT/US97/02541 and United States Patent (USP) the 5th, 298, No. 047, the content of all these documents is included in this by reference.
Advantage of the present invention has many.In the system for drawing of prior art, fibre diameter is controlled by pulling speed.Control loop is carried out the control of two step process to wire drawing.If pulling speed changes, send speed that the variation of pulling speed is responded so down.Although do not wish to retrain why the present invention is worked with any theory or explanation, we think that this can make root 13 produce vibration in stove.The vibration in stove of the root of prefabricated rods 10 can make the core shape of wire drawing optical fiber change, and the change of core shape can cause the ununiformity of higher PMD and MFD, and these two kinds of results are unfavorable to optical fiber property.
The present invention send speed by providing under the constant in drawing process, reduced the vibration of prefabricated rods.Opposite with two step control methods of well-known drawing optical fiber at full speed, the present invention sets up control algolithm, even so that also can keep sending speed constant under the prefabricated rods when pulling speed changes, thereby keeps fibre diameter.This control mechanism can reduce or may eliminate various vibrations in the wire drawing control loop (these vibrations can cause the variation of core shape at the optical fiber shaping), and reduces PMD, improves the homogeneity of MFD.
For example
Further describe the present invention below by example, these examples attempt to be used for illustrating the present invention.
Example 1
Make non-rotary optical fiber with being similar to system for drawing shown in Figure 1.Allow the pulling speed maximum to change to 19 meter per seconds,,, be approximately 2.75 millimeters/minute kinds with sending speed to remain unchanged at present so that keep fibre diameter constant.PMD and MFD homogeneity to gained optical fiber are tested.Following table 1 shows the comparative result of the optical fiber that draws down with general technology (the following speed of sending is variable).
Table 1
| Under send speed constant | |
| Reduce the percentage ratio of PMD | ????71％ |
| Improve the inhomogeneity percentage ratio of MFD | ????83％ |
Shown in the result, compare with general technology, in drawing process of the present invention, obviously reduce PMD, and improved MFD.
Example 2
With being similar to equipment drawing optical fiber shown in Figure 1.In drawing process, go back spin fiber.As mentioned above, about the embodiment in speed district the speed of sending is set down, makes it reach the nominal drawing speed of 15.5 meter per seconds according to the present invention.Test wire drawing optical fiber compares its PMD and the inhomogeneity result of MFD with the optical fiber that general drawing process draws.Carry out the different experiment of several times, and following table 2 shows the result.
Table 2
As shown in table 2, compare with the optical fiber that general technology draws, the optical fiber that draws according to the present invention, its PMD obviously reduces.The MFD homogeneity also obviously improves.
| Under send speed constant | |
| Reduce the percentage ratio of PMD | ????80％ |
| Improve the inhomogeneity percentage ratio of MFD | ????76％ |
For those skilled in the art, do not break away from the scope of claims and clause of equal value thereof, it is conspicuous that method of the present invention is carried out various modifications and variations.
Claims (16)
1. a method that is used for reducing the polarization mode dispersion of wire drawing optical fiber is characterized in that, may further comprise the steps:
Send in the stove to fix the preform that send speed will have pre-sizing in advance;
Drawing speed with at least 10 meter per seconds is pulled out optical fiber from preform;
Change drawing speed, so that keep fibre diameter constant substantially, the following speed of sending that maintenance simultaneously is scheduled to is constant.
2. the method that is used to reduce the polarization mode dispersion of wire drawing optical fiber as claimed in claim 1 is characterized in that described drawing speed is greater than 14 meter per seconds.
3. the method that is used to reduce the polarization mode dispersion of wire drawing optical fiber as claimed in claim 1 is characterized in that drawing speed changes between about 14 meter per seconds and 20 meter per seconds.
4. the method that is used to reduce the polarization mode dispersion of wire drawing optical fiber as claimed in claim 1 is characterized in that drawing speed changes between about 14 meter per seconds and 20 meter per seconds.
5. the method that is used to reduce the polarization mode dispersion of wire drawing optical fiber as claimed in claim 4 is characterized in that, also comprises the steps, promptly determines a drawing speed district at least.
6. the method that is used to reduce the polarization mode dispersion of wire drawing optical fiber as claimed in claim 5 is characterized in that, when drawing speed changes in each district, send speed to remain unchanged in each district down.
7. the method that is used to reduce the polarization mode dispersion of wire drawing optical fiber as claimed in claim 6 is characterized in that, send speed different to each district down.
8. the method that is used to reduce the polarization mode dispersion of wire drawing optical fiber as claimed in claim 7 is characterized in that, when drawing speed when a district changes to another district with higher drawing speed scope, send speed to reduce down.
9. the method that is used to reduce the polarization mode dispersion of wire drawing optical fiber as claimed in claim 7 is characterized in that, when drawing speed changes to another district with low drawing speed scope from a district, send speed to increase down.
10. the method that is used to reduce the polarization mode dispersion of wire drawing optical fiber as claimed in claim 1 is characterized in that spin fiber during wire drawing.
11. a method that is used for pulling out from preform optical fiber is characterized in that, may further comprise the steps:
Send in the fiber drawing furnace with the preform that send speed will have pre-sizing once;
Drawing speed with at least 10 meter per seconds is pulled out optical fiber from preform;
Measure the diameter of wire drawing optical fiber, and produce the signal that expression records diameter;
The signal and the nominal fibre diameter value that are produced are compared, and produce expression than second signal than difference;
The sensing drawing speed is so that judge that it is whether in the predetermined speed district;
Change drawing speed according to second signal, so that regulate the diameter of wire drawing optical fiber; And
If send speed under the drawing speed that senses outside described district, changes so.
12. drawing optical fibers method as claimed in claim 11 is characterized in that, also comprises the steps spin fiber during i.e. wire drawing.
13. drawing optical fibers method as claimed in claim 11 is characterized in that drawing speed comprises a plurality of districts, each district comprises predetermined drawing speed scope.
14. drawing optical fibers method as claimed in claim 13 is characterized in that, when drawing speed changes between described a plurality of districts, send speed under changing.
15. drawing optical fibers method as claimed in claim 14 is characterized in that, send speed to remain unchanged substantially in each district down.
16. a method that is used for reducing the polarization mode dispersion of wire drawing optical fiber is characterized in that, comprises the steps:
Send in the stove with the preform that send speed will have predetermined diameter under the constant;
Drawing speed with at least 10 meter per seconds is pulled out optical fiber from preform;
Change drawing speed, so that keep fibre diameter constant substantially.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US5966297P | 1997-09-25 | 1997-09-25 | |
| US60/059,662 | 1997-09-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1271334A true CN1271334A (en) | 2000-10-25 |
| CN1119301C CN1119301C (en) | 2003-08-27 |
Family
ID=22024419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98809377A Expired - Fee Related CN1119301C (en) | 1997-09-25 | 1998-09-10 | Draw constant downfeed process |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP1030823A4 (en) |
| JP (1) | JP2001517598A (en) |
| KR (1) | KR20010024306A (en) |
| CN (1) | CN1119301C (en) |
| AU (1) | AU738625B2 (en) |
| BR (1) | BR9812674A (en) |
| CA (1) | CA2301033A1 (en) |
| ID (1) | ID24850A (en) |
| WO (1) | WO1999015470A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1297502C (en) * | 2002-07-29 | 2007-01-31 | 三星电子株式会社 | Apparatus for drawing an optical fiber and method for controlling feed speed of an optical fiber preform |
| CN1331654C (en) * | 2004-12-31 | 2007-08-15 | 中国科学院西安光学精密机械研究所 | Drawing equipment for polymer photonic crystal optical fiber preform |
| CN1931757B (en) * | 2001-11-20 | 2012-08-29 | 王胜国 | Optical fiber drawing process and control new method |
| CN104944764A (en) * | 2015-05-29 | 2015-09-30 | 成都亨通光通信有限公司 | Drawing method with characteristic of optical fiber wire diameter control benefiting |
| CN105276122A (en) * | 2015-09-24 | 2016-01-27 | 北京天地玛珂电液控制***有限公司 | Five-plunger emulsion pump |
| CN111482477A (en) * | 2020-03-26 | 2020-08-04 | 浙江技鸣电工器材有限公司 | Online measurement control system of wire drawing machine |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6232583B1 (en) | 1999-08-20 | 2001-05-15 | Alcatel | Infrared high temperature measurement of optical fiber during draw |
| KR100642378B1 (en) * | 2005-04-04 | 2006-11-03 | 엘에스전선 주식회사 | A device for decreasing pmd by changing pressure around optical fiber and apparatus for making an optical fiber having low polarization mode dispersion by using the same |
| DE102014209606B4 (en) | 2014-05-20 | 2018-11-29 | Itv Denkendorf Produktservice Gmbh | Threads with varying thread diameter and method of manufacturing such threads |
| DE102014209601A1 (en) | 2014-05-20 | 2015-11-26 | Itv Denkendorf Produktservice Gmbh | Core-sheath-thread, core-sheath-thread-making process, medical product and medical kit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59217642A (en) * | 1983-05-23 | 1984-12-07 | Furukawa Electric Co Ltd:The | Spinning of optical fiber |
| IN169141B (en) * | 1985-08-21 | 1991-09-07 | Stc Plc | |
| JPS62153137A (en) * | 1985-12-27 | 1987-07-08 | Sumitomo Electric Ind Ltd | Wire drawing of optical fiber |
| JP2765033B2 (en) * | 1989-04-14 | 1998-06-11 | 住友電気工業株式会社 | Optical fiber drawing method |
| JPH02283633A (en) * | 1989-04-24 | 1990-11-21 | Furukawa Electric Co Ltd:The | Drawing method for optical fiber |
| JPH02307840A (en) * | 1989-05-23 | 1990-12-21 | Fujikura Ltd | Method for spinning optical fiber |
| US5298047A (en) * | 1992-08-03 | 1994-03-29 | At&T Bell Laboratories | Method of making a fiber having low polarization mode dispersion due to a permanent spin |
| JPH06211536A (en) * | 1993-01-13 | 1994-08-02 | Asahi Optical Co Ltd | Production of glass fiber |
| DE4412563A1 (en) * | 1994-04-12 | 1995-10-19 | Siecor Fertigungsgesellschaft | Appts. and method for cooling an optical fibre during its prodn. |
| FR2746093B1 (en) * | 1996-03-13 | 1998-04-24 | METHOD AND DEVICE FOR REGULATING AN OPTICAL FIBER FIBRATION TOWER TAKING INTO ACCOUNT A MEASUREMENT OF THE BARE FIBER TENSION | |
| KR0184481B1 (en) * | 1996-06-10 | 1999-05-15 | 김광호 | Highly productive optical fiber extraction facility and extraction process thereof |
-
1998
- 1998-09-10 KR KR1020007003205A patent/KR20010024306A/en not_active Application Discontinuation
- 1998-09-10 WO PCT/US1998/018785 patent/WO1999015470A1/en not_active Application Discontinuation
- 1998-09-10 JP JP2000512784A patent/JP2001517598A/en active Pending
- 1998-09-10 BR BR9812674-1A patent/BR9812674A/en not_active IP Right Cessation
- 1998-09-10 EP EP98946905A patent/EP1030823A4/en not_active Withdrawn
- 1998-09-10 CN CN98809377A patent/CN1119301C/en not_active Expired - Fee Related
- 1998-09-10 CA CA002301033A patent/CA2301033A1/en not_active Abandoned
- 1998-09-10 AU AU93817/98A patent/AU738625B2/en not_active Ceased
- 1998-09-10 ID IDW20000757A patent/ID24850A/en unknown
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1931757B (en) * | 2001-11-20 | 2012-08-29 | 王胜国 | Optical fiber drawing process and control new method |
| CN1297502C (en) * | 2002-07-29 | 2007-01-31 | 三星电子株式会社 | Apparatus for drawing an optical fiber and method for controlling feed speed of an optical fiber preform |
| CN1331654C (en) * | 2004-12-31 | 2007-08-15 | 中国科学院西安光学精密机械研究所 | Drawing equipment for polymer photonic crystal optical fiber preform |
| CN104944764A (en) * | 2015-05-29 | 2015-09-30 | 成都亨通光通信有限公司 | Drawing method with characteristic of optical fiber wire diameter control benefiting |
| CN105276122A (en) * | 2015-09-24 | 2016-01-27 | 北京天地玛珂电液控制***有限公司 | Five-plunger emulsion pump |
| CN111482477A (en) * | 2020-03-26 | 2020-08-04 | 浙江技鸣电工器材有限公司 | Online measurement control system of wire drawing machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1119301C (en) | 2003-08-27 |
| BR9812674A (en) | 2000-08-22 |
| CA2301033A1 (en) | 1999-04-01 |
| JP2001517598A (en) | 2001-10-09 |
| ID24850A (en) | 2000-08-24 |
| AU738625B2 (en) | 2001-09-20 |
| EP1030823A4 (en) | 2000-12-27 |
| KR20010024306A (en) | 2001-03-26 |
| WO1999015470A1 (en) | 1999-04-01 |
| EP1030823A1 (en) | 2000-08-30 |
| AU9381798A (en) | 1999-04-12 |
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