CN106646732B - A kind of belt stress area-birefringent polarization maintaining optical fibre and preparation method thereof - Google Patents
A kind of belt stress area-birefringent polarization maintaining optical fibre and preparation method thereof Download PDFInfo
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- CN106646732B CN106646732B CN201510718623.7A CN201510718623A CN106646732B CN 106646732 B CN106646732 B CN 106646732B CN 201510718623 A CN201510718623 A CN 201510718623A CN 106646732 B CN106646732 B CN 106646732B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/024—Optical fibres with cladding with or without a coating with polarisation maintaining properties
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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]
- C03B37/018—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] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
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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
- C03B37/022—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from molten glass in which the resultant product consists of different sorts of glass or is characterised by shape, e.g. hollow fibres, undulated fibres, fibres presenting a rough surface
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03694—Multiple layers differing in properties other than the refractive index, e.g. attenuation, diffusion, stress properties
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- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
The present invention relates to a kind of belt stress area-birefringent polarization maintaining optical fibres, it from inside to outside include fibre core, inner cladding, stressed zone and surrounding layer, the fiber core cross section is rounded, inner cladding packet is in the periphery of fibre core, the stressed zone is section in the index matching type of circular ring shape or the belt stress area of the non-matching type of refractive index, it is wrapped in the periphery of inner cladding, periphery of the surrounding layer packet in belt stress area.Compared with prior art, the present invention has many advantages, such as a kind of strong antijamming capability, high production efficiency, at low cost.
Description
Technical field
The present invention relates to a kind of annular birefringence fibers, and in particular to a kind of belt stress area-birefringent polarization maintaining optical fibre and
Preparation method.
Background technique
Fibre optic current sensor is to use Sagnac interferometry phase of light wave poor, has highly sensitive, stability is good etc.
The high-grade detection instrument of feature, current circle polarization maintaining optical fibre are prepare this instrument preferred, and existing China only has a little sample, it is external into
Mouthful, then valence is higher than gold, because great market lures, many producer's outsourcings.
Low birefringent fiber instead of justifies polarization maintaining optical fibre and prepares fibre optic current sensor, but this optical fiber is not anti-interference, electric current
Sensor performance is difficult to up to standard.
Chinese patent CN102295407A discloses a kind of manufacturing method of polarization maintaining optical fibre, and the polarization maintaining optical fibre is ellipse
Cladding type polarization maintaining optical fibre, cross-sectional structure are surrounding layer, stress area, inner cladding and sandwich layer, spy respectively from outside to inside
Sign is: the shape in stress area is ellipse, and the production method of the polarization maintaining optical fibre is patch method.The shape in this stress area
Shape is ellipse, and there are non-circular stress symmetric area, the presence of the ovality of stressed zone makes its production method complex.Comparison
Thin slice optical fiber made of patented method, core are ellipses, and the sectional view core of the patent is rounded, and reality is in as stressed zone
Ellipse does not meet and does round polarization maintaining optical fibre requirement.
Chinese patent CN10734852A discloses a kind of spindle type polarization-preserving fiber preform, which wraps from inside to outside
Fibre core, inner cladding, stressed zone and surrounding layer, core layer circular configuration are included, inner cladding is wrapped in the periphery of fibre core, inner cladding peripheral hardware
Two symmetrical spindle-type stressed zones are set, the periphery of stressed zone is surrounding layer, and surrounding layer contains base tube.Since stressed zone is spindle-type,
It to be etched in manufacturing process.Such optical fiber etching loses circle symmetrically, and core is not in circular, can not be used to prepare round polarization-maintaining
Optical fiber.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of strong antijamming capability,
High production efficiency, belt stress area at low cost-birefringent polarization maintaining optical fibre and preparation method thereof.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of belt stress area-birefringent polarization maintaining optical fibre, from inside to outside include fibre core, inner cladding, stressed zone and surrounding layer,
The fiber core cross section is rounded, and inner cladding is wrapped in the periphery of fibre core, and the stressed zone is the folding that section is in circular ring shape
The belt stress area for penetrating rate matching type or the non-matching type of refractive index is wrapped in the periphery of inner cladding, the surrounding layer Bao Huan
The periphery of shape stressed zone.
The material in the belt stress area of the non-matching type of the refractive index is SiO2And B2O3Mixture, wherein B2O3Contain
Amount is 15~16wt%；
The material in the belt stress area of the index matching type is SiO2、B2O3And GeO2Mixture, it is described mixed
Closing object is in SiO215~16wt%B of middle incorporation2O3On the basis of, mix GeO2, allow its refractive index and surrounding layer SiO2Refractive index
Maintain an equal level.
1.5-2.5 times with a thickness of core diameter in the belt stress area.Belt stress Qu Ruotai is thin, and amplitude is answered
Power is small, too thick, will affect fiber strength.
The oxide of metallic element in the fibre core including high magnetic susceptibility, the metallic element of the high magnetic susceptibility
Oxide includes Tb2O3、Ce2O3Or PbO etc..
2~3 times with a thickness of fiber core radius of the inner cladding.
A kind of preparation method of belt stress area-birefringent polarization maintaining optical fibre, including MCVD technique are prepared with belt stress area
Preform and by preform at the process of optical fiber, specifically includes the following steps:
(1) deposit surrounding layer: 1800~1900 DEG C of depositing temperature of control is passed through POCl in reaction process3Reduce temperature, In
SiO is deposited in reaction tube2、P2O5And F, refractive index control and SiO2Refractive index is closely same；
(2) the stressed zone material of the non-matching type of refractive index or index matching type deposition stress area: is deposited on step (1)
The inner surface of obtained surrounding layer, Formation cross-section are in the belt stress area of annulus；
(3) sedimentary inner envoloping layer: control refractive index is in matching type, by inner wrap material SiO2、P2O5It deposits, deposits simultaneously with F
Layer refractive index and SiO2Refractive index is closely same；
(4) fibre core and contracting stick are prepared: the core rod of the metal oxide of the prefabricated high magnetic susceptibility of incorporation is placed in reaction tube
The inside that the oxide of the metallic element of high magnetic susceptibility is deposited on inner cladding is formed fibre core by gas doping technique by center,
Then it is shrunk to preform；
(5) drawing optical fiber: 1950-2100 DEG C at a temperature of, control optical fiber rotation is away from 4~6mm, preform rotation speed
800~2000 revs/min, belt stress area-birefringent polarization maintaining optical fibre is made in 3~12 ms/min of progress wire drawings of drawing speed.
Wherein, the metal ion for mixing high magnetic susceptibility is Tb3+When, intermediate A l is added2O3(5N) can allow rare earth ion to exist
Core is uniformly distributed, and is prevented " cluster ", is led to optical quenching.
Compared with prior art, the invention has the following advantages that
The present invention is to answer in an outer plus belt stress area for low birefringent fiber inner cladding to generate radiation pressure to fibre core
Power, causing fibre core increase in density, (specific gravity improves about 0.88%, and refractive index increases n=1.5~2.0 × 10 △-3), can effectively it contain outer
Low-birefringence (B=1.0 × 10 of bound pair extreme sensitivity-8~10-9) optical fiber perturbation, to improve the interference rejection ability of this optical fiber,
Allow the polarised light of transmission, polarization state is maintained.Belt stress area of the invention allows fibre core to increase density in advance and (improves folding
Penetrate rate), reduce the sensibility externally interfered of optical fiber, with formula: ∑=P/E (wherein P is radiation stress) and(wherein E is core yang type modulus；D is core density) it indicates, it is practiced, there is positive effect, it can
At hundred times of reduction ultra-low birefringence fibers to the susceptibility of perturbation, it is allowed to be applicable in and makees current sensor.At the same time, of the invention
Metal ion lead (the Pb for increasing Verdet constant is mixed in fibre core2+) or rare earth terbium (Tb3+) cerium (Ce3+) etc., thus at double
The Faraday effect of optical fiber is increased, can reduce fibre optic current sensor uses fine length, and improves the sensitivity of measurement, will allow
This low birefringent fiber shows very strong anti-interference ability and biggish Verdet constant, passes suitable for fibre-optic current is prepared
Sensor.
The spacing of belt stress area to fibre core will rationally design, and prevent stressed zone refractive index recessed, lead to inner cladding and fibre
Multimode transmissions are presented in core, and same Bow-Tie, Panda iso-stress the type high-birefringence polarisation-maintaining optical fiber of principle is equally radiated with stressed zone
Stress increases fibre core density, except that allowing fibre core uniformly to increase density along circumferential direction with belt stress area
The anti-interference ability of optical fiber is improved, but not generates fast and slow axis (high birefringence will not be generated).It is computed and it was verified that radiates
Stress causes the change of fibre core density, is that lead to 100 times of fibre core variable density or more (be+75 to temperature change (- 50~+75 DEG C)
DEG C when 320 times, -50 DEG C of disturbance variable when 215 times) allows former low birefringent fiber to propose the resistance of interference at hundred times
It is high.
Prefabricated rods production is simple, and structural homogeneity is good, Yi Shixian uniform birefringence.Stressed zone be MCVD process deposits and
At there is fabulous circular symmetry.In rotation wire drawing, it is 4~6mm that optical fiber, which is revolved away from control, and pulling rate can reach 12 ms/min, be
One of the preferred fiber of fibre-optic current device preparation.
This optical fiber has radiation protection design, and radiation protection design refers in the outer coating of optical fiber, variable valent metal element
Oxide mixes the oxide of variable valent metal element and for by the refractive index and SiO of surrounding layer in the surrounding layer of optical fiber2
Maintain an equal level, the oxide of variable valent metal element is mixed while main dopant is mixed in fibre core, so that it is anti-radiation to form three
Defence line, the variable valent metal element includes Ce, Eu, Ti or Pb.
The present invention can provide cheap available novel optical fiber for China's fibre optic current sensor industrialization, it may be assumed that fibre-optic current
Dedicated-OCT the optical fiber of sensor, has belt stress area, and core can be passed mixed with the low birefringent fiber of high Verdet value metal ion
Defeated line or circularly polarized light have stronger interference rejection ability, and preparation cost is lower, high production efficiency, more practical.
Detailed description of the invention
Fig. 1 is belt stress area of the present invention-birefringent polarization maintaining optical fibre schematic cross-section；
In figure, 1 is fibre core, and 2 be inner cladding, and 3 be belt stress area, and 4 be surrounding layer.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
A kind of preparation method of belt stress area-birefringent polarization maintaining optical fibre, specifically includes the following steps:
(1) deposit surrounding layer: control depositing temperature is 1850 DEG C and index matching, in the anti-of 30 × 2.5 × 500mm of Φ
In should managing, it is passed through SiCl4(300mL/min)、POCl3(30mL/m)、CCl2F2(5mL/m) and O2(1800mL/min) reaction generates
SiO2、P2O5And silicofluoride；
(2) deposition stress area: after outer cladding deposition is good, it is passed through SiCl4(220mL/min)、BBr3(400mL/min) and
O2(1800mL/min) generates SiO in 1800 DEG C of at a temperature of reaction2And B2O3It is deposited on the interior of the surrounding layer that step (1) obtains
Surface, Formation cross-section are in the belt stress area of annulus；
(3) sedimentary inner envoloping layer: control refractive index is in matching type, is passed through SiCl4(300mL/min)、POCl3(40mL/min)、
CCl2F2(5mL/min) and O2(1800mL/min) 1850 DEG C at a temperature of reaction generate SiO2、P2O5It is heavy with silicofluoride
Inner surface of the product in the belt stress area that step (2) obtains；
(4) fibre core and contracting stick are prepared: due to the MCVD system using routine, by prefabricated including Ce2O3Fibre core set
Enter reaction tube center, then 1900 DEG C at a temperature of be shrunk to preform；
(5) drawing optical fiber: 2000 DEG C at a temperature of under, control optical fiber rotation away from 5mm, 1000 turns of preform rotation speed/
Minute, 9 ms/min of progress wire drawings of drawing speed, prefabricated rods revolving speed, optical fiber rotation is away from the homogeneity of pulling rate and preform arrangement
It is directly related, i.e., its anisotropy is eliminated, height isotropism is reached.Finally obtained belt stress area-birefringent polarization-maintaining light
Fibre, as shown in Figure 1, from inside to outside including fibre core 1, inner cladding 2, stressed zone 3 and surrounding layer 4,1 circular in cross-section of fibre core is interior
Covering 2 is wrapped in the periphery of fibre core 1, and stressed zone 3 is belt stress area of the section in the non-matching type of refractive index of circular ring shape, package
In the periphery of inner cladding 2, the surrounding layer 1 is wrapped in the periphery in belt stress area, and inner cladding with a thickness of core diameter
2.5 times, 2 times with a thickness of core diameter in belt stress area.Optical fiber parameter by 1 requirement of table detect and it is up to standard.
Table 1
| Parameter item | Unit | Parameter | |
| 1 | Cutoff wavelength λ | μm | 1100-1290mm |
| 2 | Fibre diameter | μm | 125±1 |
| 3 | It is coated with outer diameter | μm | 245±5 |
| 4 | Mode field diameter | μm | 8.5±0.5 |
| 5 | It is lost (feature) | dB/km | < 10 |
| 6 | Protect circularity | % | > 90 |
| 7 | Fiber cores/concentricity is poor | μm | < 0.3 |
| 8 | Core diameter | μm | 8.0±0.5 |
| 9 | Fiber lengths | m | > 100 |
| 10 | Fiber strength | Kpsi | > 80 |
Embodiment 2
The present embodiment is substantially the same manner as Example 1, the difference is that, the also 5mL/min being passed through simultaneously in step (2)
GeCl4, the product for reacting generation is SiO2、B2O3And GeO2Mixture, refractive index and surrounding layer SiO2Refractive index maintain an equal level.
Embodiment 3
The present embodiment is substantially the same manner as Example 1, the difference is that the MCVD process system that the present embodiment uses has
The special equipment of gas phase doping, step (4) are by SiCl4(300mL/min)、GeCl4(30mL/min) and O2(1800mL/min)
SiO is generated in 1850 DEG C of at a temperature of reaction2And GeO2, it is deposited on the inside formation fibre core of inner cladding, then 1900 DEG C of temperature
Under be shrunk to preform.
Embodiment 4
The present embodiment is substantially the same manner as Example 1, the difference is that, by prefabricated including Tb in step (4)2O3Fibre
Core be placed in reaction tube center, then 1900 DEG C at a temperature of be shrunk to preform
Embodiment 5
The present embodiment is substantially the same manner as Example 1, the difference is that, by prefabricated including Tb in step (4)2O3With in
Mesosome Al2O3(5N) fibre core merging reaction tube center, then 1900 DEG C at a temperature of be shrunk to preform.
Embodiment 6
The present embodiment is substantially the same manner as Example 1, the difference is that, by the prefabricated fibre core including PbO in step (4)
Be placed in reaction tube center, then 1900 DEG C at a temperature of be shrunk to preform.
Embodiment 7
This implementation is substantially the same manner as Example 1, the difference is that the thickness of the inner cladding for the optical fiber that the present embodiment obtains
It is 2 times of core diameter, 1.5 times with a thickness of core diameter in belt stress area.
Embodiment 8
This implementation is substantially the same manner as Example 1, the difference is that the thickness of the inner cladding for the optical fiber that the present embodiment obtains
It is 3 times of core diameter, 2.5 times with a thickness of core diameter in belt stress area.
Embodiment 9
This implementation is substantially the same manner as Example 1, the difference is that the drawing optical fiber in step (5) is the temperature at 1950 DEG C
Degree is lower, and the rotation of control optical fiber revolves 800 revs/min of speed, 3 ms/min of progress wire drawings of drawing speed away from 4mm, preform.
Embodiment 10
This implementation is substantially the same manner as Example 1, the difference is that the drawing optical fiber in step (5) is the temperature at 2100 DEG C
Degree is lower, and the rotation of control optical fiber revolves 2000 revs/min of speed, 12 ms/min of progress wire drawings of drawing speed away from 6mm, preform.
Claims (4)
1. a kind of belt stress area-birefringent polarization maintaining optical fibre includes fibre core, inner cladding, stressed zone and surrounding layer, institute from inside to outside
The fiber core cross section stated is rounded, and inner cladding is wrapped in the periphery of fibre core, which is characterized in that the stressed zone is section in circle
The index matching type of annular or the belt stress area of the non-matching type of refractive index, are wrapped in the periphery of inner cladding, the outsourcing
Floor is wrapped in the periphery in belt stress area；
The material in the belt stress area of the non-matching type of the refractive index is SiO2And B2O3Mixture, wherein B2O3Content be
15~16wt%；
The material in the belt stress area of the index matching type is SiO2、B2O3And GeO2Mixture, the mixture
For in SiO215~16wt%B of middle incorporation2O3On the basis of, mix GeO2, allow its refractive index and surrounding layer SiO2Refractive index maintain an equal level；
The oxide of metallic element in the fibre core including high magnetic susceptibility, the oxidation of the metallic element of the high magnetic susceptibility
Object includes Tb2O3、Ce2O3Or PbO.
2. a kind of belt stress area-birefringent polarization maintaining optical fibre according to claim 1, which is characterized in that the annular
1.5~2.5 times with a thickness of core diameter of stressed zone.
3. a kind of belt stress area-birefringent polarization maintaining optical fibre according to claim 1, which is characterized in that the interior packet
2~3 times with a thickness of fiber core radius of layer.
4. a kind of preparation method of belt stress area-birefringent polarization maintaining optical fibre as described in claim 1, which is characterized in that packet
It includes MCVD technique and is prepared with the preform in belt stress area and the process by preform at optical fiber, specifically include following
Step:
(1) it deposits surrounding layer: depositing SiO in reaction tube2、P2O5And F, refractive index control and SiO2Refractive index is closely same；
(2) deposition stress area: the stressed zone material of the non-matching type of refractive index or index matching type is deposited on step (1) and is obtained
Surrounding layer inner surface, Formation cross-section be in annulus belt stress area；
(3) sedimentary inner envoloping layer: control refractive index is in matching type, by inner wrap material SiO2、P2O5It is deposited simultaneously with F, sedimentary folding
Penetrate rate and SiO2Refractive index is closely same；
(4) fibre core and contracting stick are prepared: by the core rod merging reaction tube center of the metal oxide of the prefabricated high magnetic susceptibility of incorporation
Or the inside that the oxide of the metallic element of high magnetic susceptibility is deposited on inner cladding is formed by fibre core by gas doping technique, then
It is shrunk to preform；
(5) drawing optical fiber: 1950-2100 DEG C at a temperature of, control optical fiber rotation away from 4~6mm, preform rotation speed 800~
2000 revs/min, belt stress area-birefringent polarization maintaining optical fibre is made in 3~12 ms/min of progress wire drawings of drawing speed.
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| CN109856720B (en) * | 2019-01-16 | 2020-10-23 | 深圳太辰光通信股份有限公司 | Preparation method of magneto-optical fiber with high Verdet constant |
| CN109814182A (en) * | 2019-03-15 | 2019-05-28 | 中国工程物理研究院激光聚变研究中心 | A method of it improving high power laser system transmission pipeline inner wall and resists spuious light injury threshold |
| CN113238318B (en) * | 2021-05-08 | 2022-11-01 | 上海大学 | Magnetic deflection Tb2O3Doped optical fiber and preparation method thereof |
| CN115724584A (en) * | 2022-11-28 | 2023-03-03 | 中国电子科技集团公司第十一研究所 | Preparation method and application of rare earth ion doped multi-component silicate glass optical fiber |
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| EP0098102A1 (en) * | 1982-06-25 | 1984-01-11 | National Research Development Corporation | Method of making optical fibre preforms and optical fibre preform |
| CN1598522A (en) * | 2004-08-11 | 2005-03-23 | 哈尔滨工业大学 | Method for measuring retaining stress double-refraction value of stress deflection fibre-optical |
| CN101734852A (en) * | 2009-12-30 | 2010-06-16 | 上海亨通光电科技有限公司 | Spindle type polarization-preserving fiber preform and production method thereof |
| CN102295407A (en) * | 2010-06-25 | 2011-12-28 | 北京玻璃研究院 | Manufacturing method of polarization maintaining optical fiber |
| CN103253860A (en) * | 2012-11-15 | 2013-08-21 | 北京一轻研究院 | Manufacture method of elliptical stressed zone type polarization maintaining fiber |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0098102A1 (en) * | 1982-06-25 | 1984-01-11 | National Research Development Corporation | Method of making optical fibre preforms and optical fibre preform |
| CN1598522A (en) * | 2004-08-11 | 2005-03-23 | 哈尔滨工业大学 | Method for measuring retaining stress double-refraction value of stress deflection fibre-optical |
| CN101734852A (en) * | 2009-12-30 | 2010-06-16 | 上海亨通光电科技有限公司 | Spindle type polarization-preserving fiber preform and production method thereof |
| CN102295407A (en) * | 2010-06-25 | 2011-12-28 | 北京玻璃研究院 | Manufacturing method of polarization maintaining optical fiber |
| CN103253860A (en) * | 2012-11-15 | 2013-08-21 | 北京一轻研究院 | Manufacture method of elliptical stressed zone type polarization maintaining fiber |
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