CN206799440U - A kind of preform - Google Patents
A kind of preform Download PDFInfo
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- CN206799440U CN206799440U CN201720553840.XU CN201720553840U CN206799440U CN 206799440 U CN206799440 U CN 206799440U CN 201720553840 U CN201720553840 U CN 201720553840U CN 206799440 U CN206799440 U CN 206799440U
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- sandwich layer
- layer
- sleeve
- utility
- loose media
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Abstract
The utility model discloses a kind of preform, including loose media, the loose media includes coat, surrounding layer and sandwich layer, the outer surface of the sandwich layer is enclosed with surrounding layer, and coat is bonded with the outer wall of surrounding layer, the loose media is interspersed in graphite sleeve, and graphite sleeve is arranged in the inner chamber of sleeve pipe, the inner chamber bottom of the graphite sleeve is placed with alkali metal, and the outside lower end of described sleeve pipe is provided with heating furnace.The utility model sandwich layer is prepared by VAD techniques, wire drawing after optical wand is made after melting contracting in sleeve pipe after alkali doped, production technology and waveguiding structure are simple, are highly suitable for large-scale production.
Description
Technical field
It the utility model is related to optical fiber transmission technique field, more particularly to a kind of preform.
Background technology
It is swift and violent with the technology such as the development of international telecommunication service, especially Internet technology and 3G and EPON
Development, communication system show very fast growth trend to the demand of fiber bandwidth.In long range, Large Copacity, high rate data transmission
Communication system in, it usually needs use fiber optical amplifier technology and wavelength-division multiplex technique, especially lead in backbone network and seabed
In letter, unrepeatered transmission distance and transmission capacity to optical fiber have higher requirement.However, the growth of transmission capacity and distance
Higher launched power and lower fibre loss are needed to meet distinguishable signal to noise ratio demand.And with Optical Fiber Transmission distance
Increasingly growth, particularly in the case of undersea transmission, the quantity for reducing relay station seems increasingly important.
Publication number CN104203850A《The manufacture method of optical fiber》, there is provided the manufacture method of alkali metal optical fiber is mixed, is being set
Using the method for alkali-metal-doped in pipe in meter, this method doping speed is slow, and cost is higher after scale.
Utility model content
Based on technical problem existing for background technology, the utility model proposes a kind of preform.
The utility model proposes a kind of preform, including loose media, the loose media includes coat, surrounding layer
And sandwich layer, the outer surface of the sandwich layer is enclosed with surrounding layer, and coat is bonded with the outer wall of surrounding layer, and the loose media is worn
It is inserted in graphite sleeve, and graphite sleeve is arranged in the inner chamber of sleeve pipe, the inner chamber bottom of the graphite sleeve is placed with alkali gold
Category, the outside lower end of described sleeve pipe is provided with heating furnace.
Preferably, the sandwich layer is pure silicon plug, and sandwich layer is prepared by VAD techniques.
Preferably, the alkali metal is Na, K.
Preferably, the alkali metal content is 2000ppm.
Preferably, the ≈ 0% of sandwich layer refractive index contrast △ 1, core radius r1 are 5~7um.
Beneficial effect in the utility model：1st, the utility model sandwich layer is prepared by VAD techniques, is being covered after alkali doped
Wire drawing after optical wand is made after Guan Zhongrong contractings, production technology and waveguiding structure are simple, are highly suitable for large-scale production.
2nd, be matched cladding viscosity when VAD of the present utility model prepares such plug, sandwich layer is pure silicon plug, covering with
C2F6 or SiF6 deposits fluorine-doped quartz layer in fluorine doped inside pipe wall gas phase reaction, successively forms covering, make its folding as fluorine doped raw material
The rate of penetrating reaches required desired value, mixes micro alkali metal again so that sandwich layer viscosity reduces, and whole network structure is more loose
Relax.
3rd, the sleeve pipe for melting contracting in the utility model uses deep fluorine doped low-refraction quartz base tube, can reduce 0H- and penetrate into core
Layer, substantially reduce the water peak of optical fiber.
4th, the utility model this index that decays during can optical fiber be transmitted reaches and optimized as far as possible, and this is for over long distances
The high-speed transfer of low decay is extremely important, and is not only able to save the laid down cost of optical fiber telecommunications system, also reduces
The harmful effect to caused by communication system performance in laying work, has an important application value.
Brief description of the drawings
Accompanying drawing is used for providing further understanding to of the present utility model, and a part for constitution instruction, with this practicality
New embodiment is used to explain the utility model together, does not form to limitation of the present utility model.In the accompanying drawings：
Fig. 1 be the utility model proposes structural representation；
Fig. 2 is loose media structure chart of the present utility model.
In figure：1- loose medias, 11- coats, 12- surrounding layers, 13- sandwich layers, 2- graphite sleeves, 3- alkali metal, 4- heating
Stove, 5- sleeve pipes.
Embodiment
The utility model is made with reference to specific embodiment further to explain.
Such as Fig. 1-2, embodiment
A kind of preform, including loose media 1, the loose media 1 include coat 11, surrounding layer 12 and sandwich layer 13,
The outer surface of the sandwich layer 13 is enclosed with surrounding layer 12, and coat 11 is bonded with the outer wall of surrounding layer 12, the loose media 1
It is interspersed in graphite sleeve 2, and graphite sleeve 2 is arranged in 5 inner chambers of sleeve pipe, the inner chamber bottom of the graphite sleeve 2 is placed
There is alkali metal 3, the outside lower end of described sleeve pipe 5 is provided with heating furnace 4.
The sandwich layer 13 is pure silicon plug, and sandwich layer is prepared by VAD techniques, the surrounding layer 12 using C2F6 or SiF6 as
Fluorine doped raw material, fluorine-doped quartz layer is deposited in fluorine doped inside pipe wall gas phase reaction, the alkali metal 3 is Na, K, the alkali metal 3 from
Sub- content is 2000ppm, and the ≈ 0% of 13 refractive index contrast △ of sandwich layer 1, core layer radius r1 are 5um, the surrounding layer 12
Using SiCl4 as SiO2 raw materials.
Loose media 1 is deposited, sandwich layer 13, surrounding layer 12 and coat 11 are sintered using the manufacture of VAD methods after loose media 1 is made
Extension, after the completion of the preparation of mandrel loose body 1, chlorine dehydration is passed through, alkali metal 3 adulterates plug, after the completion of plug dehydration, puts
Enter in graphite sleeve 2, and alkali metal 3 (Na, K) is evenly placed upon the whole intracavity bottom of graphite sleeve 2, starts heating furnace 4, alkali
Metal salt is heated beyond 700 DEG C, and saturated vapour pressure is higher than 0.2kpa, wherein, programming rate is 5 DEG C/min, is maintained 3 hours, when
In-furnace temperature is increased to 1000 DEG C, maintains 1 hour, descent of temperature to room temperature, 10 DEG C/min of cooling rate, and it is small to cool down 2 at room temperature
When, the protective gas such as helium, argon gas are finally passed through, while 1500 DEG C are warming up to, sinter 4 hours, plug sintering, thermal field control is
600 DEG C, temperature rise after plug at the uniform velocity rotate, when loose media 1 be exposed to the steam of alkali metal 3 in 12 it is small when after take out, after sintering
The plug for obtaining uniform doping re-extends, and cladding sleeve pipe 5 melts contracting, mandrel outer matching fluorine doped sleeve pipe, plug is made after extension of collapsing,
Increase the secondary extension wire drawing of covering sleeve pipe again, prepare preform, prefabricated rods detection, using PK2200 to optical fiber Optical Parametric
Number carries out test confirmation, and tests added losses of the optical fiber under the differently curved radius of 1550nm and 1625nm wavelength, utilizes
OTDR measures to optical fiber attenuation, recycles NR9200 to test Refractive Index Profile of Optical.
It is described above, the only preferable embodiment of the utility model, but the scope of protection of the utility model is not
This is confined to, any one skilled in the art is in the technical scope that the utility model discloses, according to this practicality
New technical scheme and its utility model design are subject to equivalent substitution or change, should all cover in protection model of the present utility model
Within enclosing.
Claims (5)
- A kind of 1. preform, it is characterised in that including loose media, the loose media includes coat, surrounding layer and sandwich layer, The outer surface of the sandwich layer is enclosed with surrounding layer, and coat is bonded with the outer wall of surrounding layer, and the loose media is interspersed in stone In black sleeve, and graphite sleeve is arranged in the inner chamber of sleeve pipe, and the inner chamber bottom of the graphite sleeve is placed with alkali metal, described The outside lower end of sleeve pipe is provided with heating furnace.
- A kind of 2. preform according to claim 1, it is characterised in that the sandwich layer is pure silicon plug, sandwich layer by It is prepared by VAD techniques.
- 3. a kind of preform according to claim 1, it is characterised in that the alkali metal is Na, K.
- 4. a kind of preform according to claim 1, it is characterised in that the alkali metal content is 2000ppm.
- A kind of 5. preform according to claim 1, it is characterised in that the ≈ of sandwich layer refractive index contrast Δ 1 0%, core radius r1 are 5~7um.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720553840.XU CN206799440U (en) | 2017-05-18 | 2017-05-18 | A kind of preform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720553840.XU CN206799440U (en) | 2017-05-18 | 2017-05-18 | A kind of preform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206799440U true CN206799440U (en) | 2017-12-26 |
Family
ID=60741439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720553840.XU Active CN206799440U (en) | 2017-05-18 | 2017-05-18 | A kind of preform |
Country Status (1)
| Country | Link |
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| CN (1) | CN206799440U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106966581A (en) * | 2017-05-18 | 2017-07-21 | 江苏亨通光导新材料有限公司 | A kind of preform and preparation method thereof |
-
2017
- 2017-05-18 CN CN201720553840.XU patent/CN206799440U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106966581A (en) * | 2017-05-18 | 2017-07-21 | 江苏亨通光导新材料有限公司 | A kind of preform and preparation method thereof |
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