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CN1847179B - Production process of fiber preform rod - Google Patents

Production process of fiber preform rod Download PDF

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Publication number
CN1847179B
CN1847179B CN 200510050238 CN200510050238A CN1847179B CN 1847179 B CN1847179 B CN 1847179B CN 200510050238 CN200510050238 CN 200510050238 CN 200510050238 A CN200510050238 A CN 200510050238A CN 1847179 B CN1847179 B CN 1847179B
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China
Prior art keywords
loose media
blowtorch
production process
fiber preform
temperature
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CN 200510050238
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Chinese (zh)
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CN1847179A (en
Inventor
卢卫民
森昭彦
李群星
陈海斌
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Hangzhou Futong Communication Technology Co Ltd
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Futong Group Co Ltd
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Priority to CN 200510050238 priority Critical patent/CN1847179B/en
Publication of CN1847179A publication Critical patent/CN1847179A/en
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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
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/01413—Reactant delivery systems
    • C03B37/0142—Reactant deposition burners
    • 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
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2203/00—Fibre product details, e.g. structure, shape
    • C03B2203/10—Internal structure or shape details
    • C03B2203/22—Radial profile of refractive index, composition or softening point
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2207/00—Glass deposition burners
    • C03B2207/60—Relationship between burner and deposit, e.g. position
    • C03B2207/64—Angle

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General 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)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Glass Compositions (AREA)

Abstract

The present invention relates to optical fiber producing technology, and is especially production process of fiber preformrod. In the production process, the refraction index distribution shape in the profile of preformrod is regulated in synthesizing bulk body, dewatering and vitrification by means of adding oxygen, synthesizing in blow torch and regulating sintering temperature, so as to reach ideal refraction index distribution. The present invention can raise the quality of drawn optical fiber.

Description

A kind of production process of fiber preform rod
[technical field]
The present invention relates to optical fiber and make field, particularly a kind of production process of fiber preform rod.
[background technology]
Chromatic dispersion is an important parameter of expression single-mode fiber signal degradation degree.Chromatic dispersion numerical value can change with wavelength change, and the different wavelength that use are also inequality to the requirement of dispersion values.Wavelength when chromatic dispersion is zero is called zero-dispersion wavelength, wishes in optical fiber uses that therefore zero-dispersion wavelength is consistent with the actual wavelength that uses.Because zero-dispersion wavelength is influenced by the Δ value on cutoff wavelength, the index distribution, mode field diameter (MFD), the curved characteristic in addition that influenced by the Δ value, so specific refractory power design distribution range will be taken all factors into consideration above-mentioned each characteristic.Wherein use wavelength mainly to distribute as phase step type based on the optical fibre refractivity ideal distribution state of 1310nm.Wherein the fiber core specific refractory power will be higher than cladding index.Specific refractory power is suddenlyd change from the fibre core to the covering, has only a step.But will make specific refractory power form the ideal phase step type in current actual production distributes very difficult, fiber core refractive index adds its inner hotchpotch to such as the Ge element can spread by covering to the outside in order to improve, the specific refractory power of fibre core and covering critical surface is sharply changed, form an acclive slope variation.And this slope can influence the optical property of optical fiber, and particularly dispersion wavelength makes zero-dispersion wavelength move to long wavelength's one lateral deviation, as shown in Figure 1, influences the transmission speed and the quality of single-mode fiber.
[summary of the invention]
Goal of the invention of the present invention provides a kind of production process of fiber preform rod, by changing prefabricated rods section refractive index profile shape, make the Refractive Index Profile o that draws out near perfect condition, make the actual value of zero-dispersion wavelength meet the desired design scope, improve the optical fiber quality that prefabricated rods draws out.
The technical scheme that the present invention solves the employing of prior art problem is: a kind of production process of fiber preform rod, comprise the plug of usual manner production and pile up covering at mandrel outer, it is characterized in that the index distribution of control prefabricated rods section in said process, make prefabricated rods diameter D 20With D 80Ratio be not more than 1.3, D wherein 20With D 80The diameter of representing the relative center of prefabricated rods section specific refractory power largest refractive index 20% and 80% o'clock two place respectively; In the loose media building-up process, adjust the deposition reaction temperature by disposing synthetic blowtorch, improve core bag critical surface loose media density, wherein the angular range 40～50 of blowtorch and loose media axis formation is spent, 800～900 ℃ of blowtorch temperature, and synthetic loose media density is greater than 0.8g/cm 3The present invention is for reducing the core/bag section reading error of index distribution, with the plug refractive index of the centre is reference, outside from the prefabricated rods center, with the variation of relative center largest refractive index 20～80% scopes as specific refractory power slope (see figure 2), the corresponding section external diameter ratio D of the upper and lower end value of definition specific refractory power 20/ D 80Be specific refractory power slope (see figure 3), wherein D 20And D 80Represent that respectively relative refractive index is the diameter of maximum value 20% and at 80% o'clock.Repeated measurement by experiment obtains D 20/ D 80The asynchronous zero-dispersion wavelength distribution plan of ratio (see figure 4).Fig. 5-1 and Fig. 5-2 is respectively D 20/ D 80〉=1.3 and≤1.3 o'clock zero-dispersion wavelength distribution layers do not scheme, work as D 20/ D 80≤ 1.3 o'clock, guaranteed that 1310nm uses near the dispersion property of wavelength good, zero-dispersion wavelength does not move to long wavelength's one lateral deviation, is in the scope of design, has improved the transmission speed and the quality of single-mode fiber.In addition,, make the loose media densification at core/bag interface by adjusting deposition reaction, and then the distribution of control specific refractory power.
Add oxygen among the present invention in the loose media dehydration, oxygen flow is 0.1～10L/min.Compare synthetic under the same conditions loose media, D with existing production stage 20/ D 80Ratio can be reduced to below 1.3.
The optimum angle scope that blowtorch described in the present invention and loose media axis form is 45 ± 3 degree, and the blowtorch optimum temperature range is 830 ± 10 ℃.
Control sintering temperature and sintering velocity among the present invention in loose media dehydration and vitrifying process, wherein dehydration is divided into three steps, and sintering velocity is 4 ± 1mm/min, and sintering temperature is respectively 1250 ± 10 ℃, 1240 ± 10 ℃ and 1250 ± 10 ℃; Sintering velocity is 5 ± 1m/min in the vitrifying process, and sintering temperature is 1540 ± 20 ℃.By prior art as can be known in the dehydration, the too high GeO of temperature 2Can be to external diffusion, it is bad that temperature is crossed low dehydrating effect, repeatedly determines to dewater in this temperature range after the experiment, can obtain good sintering effect, and the diffusion of Ge is in allowed band again; In the vitrifying process, temperature is crossed the reduced TG poor effect, and the too high plug of temperature attenuates again easily.In this temperature range, carry out vitrifying and can obtain good result.
The present invention is by improving the plug manufacture craft, be synthesized in dehydration, the vitrifying process at loose media and control index distribution, adopt oxygenation, the synthetic blowtorch of configuration or adjusting sintering temperature and three kinds of modes of speed to adjust prefabricated rods section refractive index profile shape, it is distributed near perfect condition, improve the optical fiber quality that draws out.If three kinds of modes are used simultaneously in addition, technique effect is better.
The present invention is further illustrated below in conjunction with description of drawings and embodiment.
[description of drawings]
Fig. 1: wavelength dispersion characteristics figure.
Fig. 2: plug is to the corresponding variations in refractive index figure of covering.
Fig. 3: D 20/ D 80Corresponding refractive index profile.
Fig. 4: D 20/ D 80The corresponding zero-dispersion wavelength distribution plan of size.
Fig. 5-1:D 20/ D 80〉=1.3 o'clock other histograms of zero-dispersion wavelength distribution layer.
Fig. 5-2:D 20/ D 80≤ 1.3 o'clock other histograms of zero-dispersion wavelength distribution layer.
[embodiment]
A kind of production method of preform comprises the step that usual manner is produced plug and made covering, is synthesized to the index distribution of controlling prefabricated rods in dehydration, the vitrifying process, prefabricated rods diameter D at loose media 20With D 80Ratio≤1.3, D wherein 20With D 80The diameter of representing the relative center of prefabricated rods section specific refractory power largest refractive index 20% and 80% o'clock two place respectively.Wherein adopt three kinds of different methods to change prefabricated rods section refractive index profile shape.
Method one: when the loose media in the prefabricated rods production technique dewaters, at rare gas element (as helium, feed rate be 20～50L/min) and dehydrated air (as chlorine, feed rate is to add oxygen in 150～300cc/min) the hybird environment, oxygen flow is 0.1～10L/min, make relatively down with existence conditions, external diameter compares D 20/ D 80Can reduce to below 1.3.
Method two: the synthetic blowtorch of configuration in the loose media building-up process, adjust the deposition reaction temperature, improve the loose media density at core/bag interface, the acute angle of blowtorch and loose media axis folder becomes 45 degree; 830 ℃ of blowtorch temperature, synthetic loose media density is greater than 0.8g/cm 3
Method three: control sintering temperature and sintering velocity in loose media dehydration and vitrifying process make its optimizing.As shown in the table, wherein dehydration is divided into three steps, and the vitrifying process is with regard to a step.
The first step Second step The 3rd step The first step
Speed mm/min 4±1 4±1 4±1 5±1
Temperature ℃ 1250±10 1240±10 1250±10 1540±20
The first step Second step The 3rd step The first step
The technology title Dewatering process Glassification process

Claims (4)

1. production process of fiber preform rod, the plug of Sheng Chaning and pile up covering at mandrel outer is characterized in that the index distribution of control prefabricated rods section in the said process in the usual way, makes prefabricated rods diameter D 20With D 80Ratio be not more than 1.3, D wherein 20With D 80The diameter of representing the relative center of prefabricated rods section specific refractory power largest refractive index 20% and 80% o'clock two place respectively; In the loose media building-up process, adjust the deposition reaction temperature by disposing synthetic blowtorch, improve core bag critical surface loose media density, wherein the angular range 40～50 of blowtorch and loose media axis formation is spent, 800～900 ℃ of blowtorch temperature, and synthetic loose media density is greater than 0.8g/cm 3
2. production process of fiber preform rod according to claim 1 is characterized in that adding oxygen in the loose media dehydration, and oxygen flow is 0.1～10L/min.
3. production process of fiber preform rod according to claim 1 and 2 is characterized in that the optimum angle scope that described blowtorch and loose media axis form is 45 ± 3 degree, and the blowtorch optimum temperature range is 830 ± 10 ℃.
4. production process of fiber preform rod according to claim 1, it is characterized in that control sintering temperature and sintering velocity in loose media dehydration and vitrifying process, wherein dehydration is divided into three steps, sintering velocity is 4 ± 1mm/min, and sintering temperature is respectively 1250 ± 10 ℃, 1240 ± 10 ℃ and 1250 ± 10 ℃; Sintering velocity is 5 ± 1mm/min in the vitrifying process, and sintering temperature is 1540 ± 20 ℃.
CN 200510050238 2005-04-13 2005-04-13 Production process of fiber preform rod Active CN1847179B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107255602B (en) * 2017-06-06 2020-05-05 武汉烽火锐拓科技有限公司 Method and device for on-line measuring density of loose body

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0249230A1 (en) * 1986-06-11 1987-12-16 Sumitomo Electric Industries Limited Glass preform for dispersion shifted single mode optical fiber and method for the production of the same
US5676725A (en) * 1993-06-18 1997-10-14 Sumitomo Electric Industries Ltd Method of manufacturing single-mode optical fiber
CN1186250A (en) * 1996-12-27 1998-07-01 住友电气工业株式会社 Dispersion-shifted fiber
CN1297856A (en) * 2000-12-28 2001-06-06 烽火通信科技股份有限公司 Method of making large prefabricated optical fiber bar
CN1326555A (en) * 1998-11-02 2001-12-12 住友电气工业株式会社 Single-mode optical fiber and its production method
CN1400478A (en) * 2001-07-26 2003-03-05 株式会社藤仓 Optical fiber, prefabricated optical fiber rod and its making process
CN1417602A (en) * 2001-11-09 2003-05-14 株式会社藤仓 Optical fiber, prefabricated fiber rod and manufacture thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0249230A1 (en) * 1986-06-11 1987-12-16 Sumitomo Electric Industries Limited Glass preform for dispersion shifted single mode optical fiber and method for the production of the same
US5676725A (en) * 1993-06-18 1997-10-14 Sumitomo Electric Industries Ltd Method of manufacturing single-mode optical fiber
CN1186250A (en) * 1996-12-27 1998-07-01 住友电气工业株式会社 Dispersion-shifted fiber
CN1326555A (en) * 1998-11-02 2001-12-12 住友电气工业株式会社 Single-mode optical fiber and its production method
CN1297856A (en) * 2000-12-28 2001-06-06 烽火通信科技股份有限公司 Method of making large prefabricated optical fiber bar
CN1400478A (en) * 2001-07-26 2003-03-05 株式会社藤仓 Optical fiber, prefabricated optical fiber rod and its making process
CN1417602A (en) * 2001-11-09 2003-05-14 株式会社藤仓 Optical fiber, prefabricated fiber rod and manufacture thereof

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C06 Publication
C41 Transfer of patent application or patent right or utility model
PB01 Publication
TA01 Transfer of patent application right

Effective date of registration: 20060804

Address after: Zhejiang city of Fuyang province Shou Jiang Zhen Zhu Jia

Applicant after: Zhejiang Futong Optical Fiber Technology Co., Ltd.

Address before: Fuyang City, Zhejiang Province, Silver Lake Development Zone

Applicant before: Hangzhou Futong Communication Technology Co., Ltd.

C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
ASS Succession or assignment of patent right

Owner name: FUTONG GROUP CO.,LTD.

Free format text: FORMER OWNER: ZHEJIANG FUTONG OPTICAL FIBER TECHN CO., LTD.

Effective date: 20070216

C41 Transfer of patent application or patent right or utility model
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Effective date of registration: 20070216

Address after: 311400, No. 1-8, Fortis Science Park, Golden Autumn Road, Zhejiang, Fuyang

Applicant after: Futong Group Co., Ltd.

Address before: 311422 Zhejiang province Fuyang Shoujiang Zhu Jia

Applicant before: Zhejiang Futong Optical Fiber Technology Co., Ltd.

C14 Grant of patent or utility model
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C41 Transfer of patent application or patent right or utility model
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Effective date of registration: 20160405

Address after: 311422 Yinhe Development Zone, Fuyang District, Hangzhou, Zhejiang

Patentee after: Hangzhou Futong Communication Technology Co., Ltd.

Address before: 311400, No. 1-8, Fortis Science Park, Golden Autumn Road, Zhejiang, Fuyang

Patentee before: Futong Group Co., Ltd.