CN106646733B - A kind of ellipse polarization maintaining optical fibre and preparation method thereof - Google Patents
A kind of ellipse polarization maintaining optical fibre and preparation method thereof Download PDFInfo
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- G—PHYSICS
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- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
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- G02B6/024—Optical fibres with cladding with or without a coating with polarisation maintaining properties
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- 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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- 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
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
- C03B37/02709—Polarisation maintaining fibres, e.g. PM, PANDA, bi-refringent optical fibres
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- C03B37/01—Manufacture of glass fibres or filaments
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- 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
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
- C03B37/02745—Fibres having rotational spin around the central longitudinal axis, e.g. alternating +/- spin to reduce polarisation mode dispersion
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- 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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- C03B2203/10—Internal structure or shape details
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- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/30—Polarisation maintaining [PM], i.e. birefringent products, e.g. with elliptical core, by use of stress rods, "PANDA" type fibres
- C03B2203/302—Non-circular core cross-sections
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- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
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Abstract
The present invention relates to a kind of oval polarization maintaining optical fibres and preparation method thereof, the cross section structure of the polarization maintaining optical fibre is followed successively by oval core layer from the inside to surface, wrap up the inner cladding of the core layer, wrap up the stress region layer of the inner cladding, and the surrounding layer of the stress region layer is wrapped up, also doped with the Tb of 800~1000ppm in the core layer2O3With the CeO of 250~300ppm2, the oval polarization maintaining optical fibre is prepared by following steps: (1) first preparing corresponding preform as requested；(2) preform obtained is fixed on spin draw machine, operation spin draw machine, which is drawn, obtains oval polarization maintaining optical fibre.Compared with prior art, optical fiber produced by the present invention Faraday effect with higher and very strong radiation resistance, manufactured electromagnetic field detection instrument precision is high, short with fibre, is applicable under strong radiation environment and works.
Description
Technical field
The present invention relates to special optical fiber fields, more particularly, to a kind of oval polarization maintaining optical fibre and preparation method thereof.
Background technique
The detection device of existing overhead power grid is heavy, outmoded, precision is low.Annoying industry experts, the scholar in the whole world.Through proving
Circularly polarized light, anti-interference can be transmitted by having round polarization maintaining optical fibre only, there is very strong Faraday effect.Fibre-optic current is made with this optical fiber to pass
Device (OCT) may replace old-fashioned detection instrument, and small in size, and precision is high.But because the preparation method of circle polarization maintaining optical fibre is more tired
The Huang Hongjia academician of difficulty, China just leads team to research and develop from nineteen ninety, only makes minute quantity " circle polarization-maintaining " optical fiber sample so far
Product.Currently, the circle polarization maintaining optical fibre of the overwhelming majority derives from import, price is prohibitively expensive.Currently on the market, often with low-birefringence
Optical fiber substitutes circle polarization maintaining optical fibre and prepares current sensor, but low birefringent fiber is extremely sensitive to interference.
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 anti-radiation ellipses
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 ellipse polarization maintaining optical fibre, the cross section structure of the polarization maintaining optical fibre are followed successively by oval core layer from the inside to surface,
The inner cladding for wrapping up the core layer wraps up the stress region layer of the inner cladding, and the package stress region layer
Surrounding layer, also doped with the Tb of 800~1000ppm in the core layer2O3With the CeO of 250~300ppm2。
The circularity of the core layer is 60~90%.
The diameter of the oval polarization maintaining optical fibre is 120~130 μm, wherein the long axial length and inner cladding of core layer are answered
It is 4:40:100:125 that power, which acts on region layer and the diameter ratio of surrounding layer,.
A kind of preparation method of ellipse polarization maintaining optical fibre, comprising the following steps:
(1) SiCl is passed through in quartzy base tube4And O2, heating reaction, and deposit and obtain SiO2Prefabricated rods surrounding layer；
(2) after prefabricated rods outer cladding deposition is good, it is passed through SiCl4、BBr3And O2, heating is reacted, in prefabricated rods surrounding layer
Upper deposition SiO2/B2O3Prefabricated rods stress region layer；
(3) it is passed through etching gas, using the quartzy base tube center of circle as symmetric points, etching removes the symmetrical both sides of prefabricated rods stress region layer
Part stressed zone so that the symmetrical both sides of the prefabricated rods stress region layer of remainder are mutually not connected to；
(4) after the completion of etching, it is passed through SiCl4、POCl3、SF6And O2, reaction is heated, deposition obtains prefabricated rods inner cladding, in advance
The stress region layer that etching removes first is partially filling up by stick inner cladding processed during the deposition process, then in the stress for not etching removing
Region layer deposits on surface；
(5) after the completion of prefabricated rods inner cladding deposition, it is passed through SiCl4、GeCl4、TbCl3、CeCl4And O2, it heats and is reacted,
Deposition obtains stick sandwich layer；
(6) after the completion of depositing, heated quartz base tube is sintered each layer, that is, shrinks and obtain elliptical fiber prefabricated rods；
(7) elliptical fiber prefabricated rods obtained are fixed on spin draw machine, and make its backspin end deviation Ri < 50 μm,
Operation spin draw machine arrives oval polarization maintaining optical fibre to elliptical fiber preform.
SiCl described in step (1)4And O2Intake molar ratio be (1~1.2): 1, reaction temperature be 1850 DEG C；
SiCl described in step (2)4、BBr3And O2Intake molar ratio be (78~80): (32~33): 150,
Its reaction temperature is 1650~1850 DEG C；
Etching gas described in step (3) is SF6, etching temperature is 1450~1850 DEG C, and the prefabricated rods after etching are answered
Power region layer is in butterfly junction type or panda type；
SiCl described in step (4)4、POCl3、SF6And O2Intake molar ratio be (30~40): (3~5): 1:
(80~100), heating reaction temperature are 1850~2050 DEG C；
SiCl described in step (5)4、GeCl4、TbCl3、CeCl4And O2Intake molar ratio be (2~3): 1:
(0.1~0.2): (0.035~0.06): (10~20), heating reaction temperature are 1850~2050 DEG C；
Sintering temperature described in step (6) is 2250~2450 DEG C.
When prefabricated rods stress region layer after etching is in butterfly junction type；The diameter of elliptical fiber prefabricated rods obtained be 15~
18mm, the rotation speed of spin draw machine are 1000r/min, and rotation intercept is 5~6mm, and drawing speed is 5~6m/min；
When prefabricated rods stress region layer after etching is in panda type, the diameter of elliptical fiber prefabricated rods obtained is 40~
45mm, the rotation speed of spin draw machine are 2000r/min, and rotation intercept is 4~5mm, and drawing speed is 8~10m/min.
In step (1)~(2) and step (4)~(5), the prefabricated rods surrounding layer of deposition, prefabricated rods stress region layer, prefabricated rods
The ratio between thickness of inner cladding and stick sandwich layer is (1.2~1.5): (3~5): 2:(0.3~0.4).
The present invention during the preparation process, by first preparing the preform of butterfly junction type stressed zone or panda type stressed zone,
And the inner cladding of prefabricated rods is SiO2/P2O5/ F inner cladding, relatively with the Young's modulus difference of the stress region layer of special construction
Greatly, so that preform is during shrinking molding, stick sandwich layer is still able to maintain higher circularity, by preparing
Tb is passed through in journey3+And Ce4+, to deposit corresponding oxide Tb in stick sandwich layer2O3And CeO2, effective to increase what drawing obtained
The Verdet constant of oval polarization maintaining optical fibre, improves the paramagnetism of oval polarization maintaining optical fibre, and then improves and use the ellipse polarization maintaining optical fibre
The precision of detection instrument obtained, while polarization maintaining optical fibre being allowed to generate certain capability of resistance to radiation.
Compared with prior art, optical fiber produced by the present invention Faraday effect with higher and very strong radiation resistance
Can, manufactured electromagnetic field detection instrument precision is high, and it is short with fibre, it is applicable under strong radiation environment and works.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of oval polarization maintaining optical fibre obtained in embodiment 1；
Fig. 2 is the Verdet constant of ellipse polarization maintaining optical fibre and the relational graph of wavelength made from embodiment 1；
Fig. 3 is the Verdet constant of ellipse polarization maintaining optical fibre and the relational graph of temperature made from embodiment 1；
In figure, 1- surrounding layer, 2- stress region layer, 3- inner cladding, 4- core 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 ellipse polarization maintaining optical fibre, structure is as shown in Figure 1, the cross section structure of the polarization maintaining optical fibre is followed successively by from the inside to surface and is in
The core layer 4 of ellipse, wraps up the inner cladding 3 of the core layer 4, wraps up the stress region layer 2 of the inner cladding 3, and
The surrounding layer 1 of the stress region layer 2 is wrapped up, also doped with the Tb of 800ppm in the core layer 42O3With 250ppm's
CeO2, the circularity of the core layer 4 is 60%, and the diameter of the oval polarization maintaining optical fibre is 120 μm, wherein core layer 4
The diameter ratio of long axial length and inner cladding 3, stress region layer 2 and surrounding layer 1 is 4:40:100:125.
The preparation method of above-mentioned ellipse polarization maintaining optical fibre, comprising the following steps:
(1) 1:1 is passed through SiCl in molar ratio in quartzy base tube4And O2, it is heated to reacting, and deposit and obtain SiO2It is prefabricated
Stick surrounding layer；
(2) after prefabricated rods outer cladding deposition is good, 78:32:150 is passed through SiCl in molar ratio4、BBr3And O2, it is heated to 1650
It DEG C is reacted, deposits SiO on prefabricated rods surrounding layer2/B2O3Prefabricated rods stress region layer；
(3) it is passed through etching gas SF6, using the quartzy base tube center of circle as symmetric points, removed in 1450~1850 DEG C of etchings prefabricated
The part stressed zone on the symmetrical both sides of stick stress region layer, so that the symmetrical both sides of the prefabricated rods stress region layer of remainder are mutually not connected to
It and is in panda type；
(4) after the completion of etching, 30:3:1:80 is passed through SiCl in molar ratio4、POCl3、SF6And O2, it is heated to 1850 DEG C instead
It answers, deposition obtains SiO2/P2O5/ F prefabricated rods inner cladding；
(5) after the completion of prefabricated rods inner cladding deposition, 2:1:0.1:0.035:10 is passed through SiCl in molar ratio4、GeCl4、
TbCl3、CeCl4And O2, it is heated to 1850 DEG C and is reacted, deposition obtains stick sandwich layer；
(6) after the completion of depositing, at this point, prefabricated rods surrounding layer, prefabricated rods stress region layer, prefabricated rods inner cladding and stick sandwich layer
The ratio between thickness is 1.2:3:2:0.3, and heated quartz base tube is sintered each layer to 2250 DEG C, i.e. it is pre- to obtain elliptical fiber for contraction
Stick processed, a diameter of 40mm,；
(7) elliptical fiber prefabricated rods obtained are fixed on spin draw machine, and make its backspin end deviation Ri < 50 μm,
Spin draw machine is run, so that the rotation speed of spin draw machine is 2000r/min, rotation intercept is 4mm, and drawing speed is
8m/min arrives the oval polarization maintaining optical fibre of panda type to elliptical fiber preform.
Its application performance under different temperatures and wavelength is tested to the oval polarization maintaining optical fibre of panda type obtained, as a result such as
Shown in Fig. 2 and Fig. 3, it is known that, it, should be as far as possible in shortwave and low temperature in order to enhance faraday (faraday) effect of polarization maintaining optical fibre
Lower use.
Embodiment 2
A kind of ellipse polarization maintaining optical fibre, the cross section structure of the polarization maintaining optical fibre are followed successively by oval core layer 4 from the inside to surface,
The inner cladding 3 for wrapping up the core layer 4 wraps up the stress region layer 2 of the inner cladding 3, and the package stress
The surrounding layer 1 of region layer 2, also doped with the Tb of 1000ppm in the core layer 42O3With the CeO of 300ppm2, the fibre core
The circularity of layer 4 is 90%, and the diameter of the oval polarization maintaining optical fibre is 130 μm, wherein the long axial length of core layer 4 and interior packet
The diameter ratio of layer 3, stress region layer 2 and surrounding layer 1 is 4:40:100:125.
The preparation method of above-mentioned ellipse polarization maintaining optical fibre, comprising the following steps:
(1) 1.2:1 is passed through SiCl in molar ratio in quartzy base tube4And O2, it is heated to reacting, and deposit and obtain SiO2In advance
Stick surrounding layer processed；
(2) after prefabricated rods outer cladding deposition is good, 80:32:150 is passed through SiCl in molar ratio4、BBr3And O2, it is heated to 1850
It DEG C is reacted, deposits SiO on prefabricated rods surrounding layer2/B2O3Prefabricated rods stress region layer；
(3) it is passed through etching gas SF6, using the quartzy base tube center of circle as symmetric points, prefabricated rods stress is removed in 1850 DEG C of etchings
The part stressed zone on the symmetrical both sides of region layer, so that the symmetrical both sides of the prefabricated rods stress region layer of remainder are mutually not connected to and in bear
Cat type；
(4) after the completion of etching, 40:5:1:100 is passed through SiCl in molar ratio4、POCl3、SF6And O2, it is heated to 2050 DEG C instead
It answers, deposition obtains prefabricated rods inner cladding；
(5) after the completion of prefabricated rods inner cladding deposition, 3:1:0.2:0.06:20 is passed through SiCl in molar ratio4、GeCl4、
TbCl3、CeCl4And O2, it is heated to 2050 DEG C and is reacted, deposition obtains stick sandwich layer；
(6) after the completion of depositing, at this point, prefabricated rods surrounding layer, prefabricated rods stress region layer, prefabricated rods inner cladding and stick sandwich layer
The ratio between thickness is 1.5:3:2:0.4, and heated quartz base tube is sintered each layer to 2450 DEG C, i.e. it is pre- to obtain elliptical fiber for contraction
Stick processed, a diameter of 42mm,；
(7) elliptical fiber prefabricated rods obtained are fixed on spin draw machine, and make its backspin end deviation Ri < 50 μm,
Spin draw machine is run, so that the rotation speed of spin draw machine is 2000r/min, rotation intercept is 5mm, and drawing speed is
10m/min arrives the oval polarization maintaining optical fibre of panda type to elliptical fiber preform.
Embodiment 3
A kind of ellipse polarization maintaining optical fibre, the cross section structure of the polarization maintaining optical fibre are followed successively by oval core layer 4 from the inside to surface,
The inner cladding 3 for wrapping up the core layer 4 wraps up the stress region layer 2 of the inner cladding 3, and the package stress
The surrounding layer 1 of region layer 2, also doped with the Tb of 900ppm in the core layer 42O3With the CeO of 275ppm2, the core layer
4 circularity is 75%, and the diameter of the oval polarization maintaining optical fibre is 125 μm, wherein the long axial length and inner cladding of core layer 4
3, the diameter ratio of stress region layer 2 and surrounding layer 1 is 4:40:100:125.
The preparation method of above-mentioned ellipse polarization maintaining optical fibre, comprising the following steps:
(1) 1.1:1 is passed through SiCl in molar ratio in quartzy base tube4And O2, it is heated to reacting, and deposit and obtain SiO2In advance
Stick surrounding layer processed；
(2) after prefabricated rods outer cladding deposition is good, 79:32.5:150 is passed through SiCl in molar ratio4、BBr3And O2, it is heated to
1750 DEG C are reacted, and deposit SiO on prefabricated rods surrounding layer2/B2O3Prefabricated rods stress region layer；
(3) it is passed through etching gas SF6, using the quartzy base tube center of circle as symmetric points, prefabricated rods stress is removed in 1650 DEG C of etchings
The part stressed zone on the symmetrical both sides of region layer, so that the symmetrical both sides of the prefabricated rods stress region layer of remainder are mutually not connected to and in bear
Cat type；
(4) after the completion of etching, 35:4:1:90 is passed through SiCl in molar ratio4、POCl3、SF6And O2, it is heated to 1850~
2050 DEG C of reactions, deposition obtain prefabricated rods inner cladding；
(5) after the completion of prefabricated rods inner cladding deposition, 2.5:1:0.15:0.045:15 is passed through SiCl in molar ratio4、GeCl4、
TbCl3、CeCl4And O2, it is heated to 2000 DEG C and is reacted, deposition obtains stick sandwich layer；
(6) after the completion of depositing, at this point, prefabricated rods surrounding layer, prefabricated rods stress region layer, prefabricated rods inner cladding and stick sandwich layer
The ratio between thickness is 1.4:4:2:0.35, and heated quartz base tube is sintered each layer to 2350 DEG C, that is, shrinks and obtain elliptical fiber
Prefabricated rods, a diameter of 45mm,；
(7) elliptical fiber prefabricated rods obtained are fixed on spin draw machine, and make its backspin end deviation Ri < 50 μm,
Spin draw machine is run, so that the rotation speed of spin draw machine is 2000r/min, rotation intercept is 4.5mm, and drawing speed is
9m/min arrives the oval polarization maintaining optical fibre of panda type to elliptical fiber preform.
Embodiment 4
A kind of ellipse polarization maintaining optical fibre, structure is as shown in Figure 1, the cross section structure of the polarization maintaining optical fibre is followed successively by from the inside to surface and is in
The core layer 4 of ellipse, wraps up the inner cladding 3 of the core layer 4, wraps up the stress region layer 2 of the inner cladding 3, and
The surrounding layer 1 of the stress region layer 2 is wrapped up, also doped with the Tb of 800ppm in the core layer 42O3With 250ppm's
CeO2, the circularity of the core layer 4 is 60%, and the diameter of the oval polarization maintaining optical fibre is 120 μm, wherein core layer 4
The diameter ratio of long axial length and inner cladding 3, stress region layer 2 and surrounding layer 1 is 4:40:100:125.
The preparation method of above-mentioned ellipse polarization maintaining optical fibre, comprising the following steps:
(1) 1:1 is passed through SiCl in molar ratio in quartzy base tube4And O2, it is heated to reacting, and deposit and obtain SiO2It is prefabricated
Stick surrounding layer；
(2) after prefabricated rods outer cladding deposition is good, 78:32:150 is passed through SiCl in molar ratio4、BBr3And O2, it is heated to 1650
It DEG C is reacted, deposits SiO on prefabricated rods surrounding layer2/B2O3Prefabricated rods stress region layer；
(3) it is passed through etching gas SF6, using the quartzy base tube center of circle as symmetric points, removed in 1450~1850 DEG C of etchings prefabricated
The part stressed zone on the symmetrical both sides of stick stress region layer, so that the symmetrical both sides of the prefabricated rods stress region layer of remainder are mutually not connected to
It and is in butterfly junction type；
(4) after the completion of etching, 30:3:1:80 is passed through SiCl in molar ratio4、POCl3、SF6And O2, it is heated to 1850 DEG C instead
It answers, deposition obtains SiO2/P2O5/ F prefabricated rods inner cladding；
(5) after the completion of prefabricated rods inner cladding deposition, 2:1:0.1:0.035:10 is passed through SiCl in molar ratio4、GeCl4、
TbCl3、CeCl4And O2, it is heated to 1850 DEG C and is reacted, deposition obtains stick sandwich layer；
(6) after the completion of depositing, at this point, prefabricated rods surrounding layer, prefabricated rods stress region layer, prefabricated rods inner cladding and stick sandwich layer
The ratio between thickness is 1.2:3:2:0.3, and heated quartz base tube is sintered each layer to 2250 DEG C, i.e. it is pre- to obtain elliptical fiber for contraction
Stick processed, a diameter of 15mm,；
(7) elliptical fiber prefabricated rods obtained are fixed on spin draw machine, and make its backspin end deviation Ri < 50 μm,
Spin draw machine is run, so that the rotation speed of spin draw machine is 1000r/min, rotation intercept is 5mm, and drawing speed is
5m/min arrives the oval polarization maintaining optical fibre of butterfly junction type to elliptical fiber preform.
Embodiment 5
A kind of ellipse polarization maintaining optical fibre, the cross section structure of the polarization maintaining optical fibre are followed successively by oval core layer 4 from the inside to surface,
The inner cladding 3 for wrapping up the core layer 4 wraps up the stress region layer 2 of the inner cladding 3, and the package stress
The surrounding layer 1 of region layer 2, also doped with the Tb of 1000ppm in the core layer 42O3With the CeO of 300ppm2, the fibre core
The circularity of layer 4 is 90%, and the diameter of the oval polarization maintaining optical fibre is 130 μm, wherein the long axial length of core layer 4 and interior packet
The diameter ratio of layer 3, stress region layer 2 and surrounding layer 1 is 4:40:100:125.
The preparation method of above-mentioned ellipse polarization maintaining optical fibre, comprising the following steps:
(1) 1.2:1 is passed through SiCl in molar ratio in quartzy base tube4And O2, it is heated to reacting, and deposit and obtain SiO2In advance
Stick surrounding layer processed；
(2) after prefabricated rods outer cladding deposition is good, 80:32:150 is passed through SiCl in molar ratio4、BBr3And O2, it is heated to 1850
It DEG C is reacted, deposits SiO on prefabricated rods surrounding layer2/B2O3Prefabricated rods stress region layer；
(3) it is passed through etching gas SF6, using the quartzy base tube center of circle as symmetric points, prefabricated rods stress is removed in 1850 DEG C of etchings
The part stressed zone on the symmetrical both sides of region layer, so that the symmetrical both sides of the prefabricated rods stress region layer of remainder are mutually not connected to and in butterfly
Junction type；
(4) after the completion of etching, 40:5:1:100 is passed through SiCl in molar ratio4、POCl3、SF6And O2, it is heated to 2050 DEG C instead
It answers, deposition obtains prefabricated rods inner cladding；
(5) after the completion of prefabricated rods inner cladding deposition, 3:1:0.2:0.06:20 is passed through SiCl in molar ratio4、GeCl4、
TbCl3、CeCl4And O2, it is heated to 2050 DEG C and is reacted, deposition obtains stick sandwich layer；
(6) after the completion of depositing, at this point, prefabricated rods surrounding layer, prefabricated rods stress region layer, prefabricated rods inner cladding and stick sandwich layer
The ratio between thickness is 1.5:3:2:0.4, and heated quartz base tube is sintered each layer to 2450 DEG C, i.e. it is pre- to obtain elliptical fiber for contraction
Stick processed, a diameter of 18mm,；
(7) elliptical fiber prefabricated rods obtained are fixed on spin draw machine, and make its backspin end deviation Ri < 50 μm,
Spin draw machine is run, so that the rotation speed of spin draw machine is 1000r/min, rotation intercept is 6mm, and drawing speed is
6m/min arrives the oval polarization maintaining optical fibre of butterfly junction type to elliptical fiber preform.
Embodiment 6
A kind of ellipse polarization maintaining optical fibre, the cross section structure of the polarization maintaining optical fibre are followed successively by oval core layer 4 from the inside to surface,
The inner cladding 3 for wrapping up the core layer 4 wraps up the stress region layer 2 of the inner cladding 3, and the package stress
The surrounding layer 1 of region layer 2, also doped with the Tb of 900ppm in the core layer 42O3With the CeO of 275ppm2, the core layer
4 circularity is 75%, and the diameter of the oval polarization maintaining optical fibre is 125 μm, wherein the long axial length and inner cladding of core layer 4
3, the diameter ratio of stress region layer 2 and surrounding layer 1 is 4:40:100:125.
The preparation method of above-mentioned ellipse polarization maintaining optical fibre, comprising the following steps:
(1) 1.1:1 is passed through SiCl in molar ratio in quartzy base tube4And O2, it is heated to reacting, and deposit and obtain SiO2In advance
Stick surrounding layer processed；
(2) after prefabricated rods outer cladding deposition is good, 79:32.5:150 is passed through SiCl in molar ratio4、BBr3And O2, it is heated to
1750 DEG C are reacted, and deposit SiO on prefabricated rods surrounding layer2/B2O3Prefabricated rods stress region layer；
(3) it is passed through etching gas SF6, using the quartzy base tube center of circle as symmetric points, prefabricated rods stress is removed in 1650 DEG C of etchings
The part stressed zone on the symmetrical both sides of region layer, so that the symmetrical both sides of the prefabricated rods stress region layer of remainder are mutually not connected to and in butterfly
Junction type；
(4) after the completion of etching, 35:4:1:90 is passed through SiCl in molar ratio4、POCl3、SF6And O2, it is heated to 1850~
2050 DEG C of reactions, deposition obtain prefabricated rods inner cladding；
(5) after the completion of prefabricated rods inner cladding deposition, 2.5:1:0.15:0.045:15 is passed through SiCl in molar ratio4、GeCl4、
TbCl3、CeCl4And O2, it is heated to 2000 DEG C and is reacted, deposition obtains stick sandwich layer；
(6) after the completion of depositing, at this point, prefabricated rods surrounding layer, prefabricated rods stress region layer, prefabricated rods inner cladding and stick sandwich layer
The ratio between thickness is 1.4:4:2:0.35, and heated quartz base tube is sintered each layer to 2350 DEG C, that is, shrinks and obtain elliptical fiber
Prefabricated rods, a diameter of 16mm,；
(7) elliptical fiber prefabricated rods obtained are fixed on spin draw machine, and make its backspin end deviation Ri < 50 μm,
Spin draw machine is run, so that the rotation speed of spin draw machine is 1000r/min, rotation intercept is 5.5mm, and drawing speed is
5.5m/min arrives the oval polarization maintaining optical fibre of butterfly junction type to elliptical fiber preform.
The specification of ellipse polarization maintaining optical fibre obtained is as shown in table 1 below:
The above description of the embodiments is intended to facilitate ordinary skill in the art to understand and use the invention.
Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein general
Principle is applied in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, ability
Field technique personnel announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be of the invention
Within protection scope.
Claims (6)
1. it is a kind of ellipse polarization maintaining optical fibre preparation method, which is characterized in that it is described ellipse polarization maintaining optical fibre cross section structure from it is inner to
It is followed successively by oval core layer outside, wraps up the inner cladding of the core layer, wraps up the stress region layer of the inner cladding,
And the surrounding layer of the stress region layer is wrapped up, also doped with the Tb of 800~1000ppm in the core layer2O3With
The CeO of 250~300ppm2；
The preparation method comprises the following steps:
(1) SiCl is passed through in quartzy base tube4And O2, heating reaction, and deposit and obtain SiO2Prefabricated rods surrounding layer；
(2) after prefabricated rods outer cladding deposition is good, it is passed through SiCl4、BBr3And O2, heating is reacted, heavy on prefabricated rods surrounding layer
Product SiO2/B2O3Prefabricated rods stress region layer；
(3) it is passed through etching gas, using the quartzy base tube center of circle as symmetric points, etching removes the portion on the symmetrical both sides of prefabricated rods stress region layer
Component of stress area, so that the symmetrical both sides of the prefabricated rods stress region layer of remainder are mutually not connected to；
(4) after the completion of etching, it is passed through SiCl4、POCl3、SF6And O2, reaction is heated, deposition obtains prefabricated rods inner cladding；
(5) after the completion of prefabricated rods inner cladding deposition, it is passed through SiCl4、GeCl4、TbCl3、CeCl4And O2, heat and reacted, deposited
Obtain stick sandwich layer；
(6) after the completion of depositing, heated quartz base tube is sintered each layer, that is, shrinks and obtain elliptical fiber prefabricated rods；
(7) elliptical fiber prefabricated rods obtained are fixed on spin draw machine, and make its backspin end deviation Ri < 50 μm, it runs
Spin draw machine arrives oval polarization maintaining optical fibre to elliptical fiber preform.
2. a kind of preparation method of oval polarization maintaining optical fibre according to claim 1, which is characterized in that the core layer
Circularity is 60~90%.
3. a kind of preparation method of oval polarization maintaining optical fibre according to claim 1, which is characterized in that the oval polarization-maintaining
The diameter of optical fiber is 120~130 μm, wherein the long axial length and inner cladding of core layer, stress region layer and surrounding layer it is straight
The ratio between diameter is 4:40:100:125.
4. a kind of preparation method of oval polarization maintaining optical fibre according to claim 1, which is characterized in that described in step (1)
SiCl4And O2Intake molar ratio be (1~1.2): 1, reaction temperature be 1850 DEG C；
SiCl described in step (2)4、BBr3And O2The molar ratio of intake be (78~80): (32~33): 150, it is anti-
Answering temperature is 1650~1850 DEG C；
Etching gas described in step (3) is SF6, etching temperature is 1450~1850 DEG C, the prefabricated rods stress region layer after etching
In butterfly junction type or panda type；
SiCl described in step (4)4、POCl3、SF6And O2Intake molar ratio be (30~40): (3~5): 1:(80~
100), heating reaction temperature is 1850~2050 DEG C；
SiCl described in step (5)4、GeCl4、TbCl3、CeCl4And O2Intake molar ratio be (2~3): 1:(0.1~
0.2): (0.035~0.06): (10~20), heating reaction temperature are 1850~2050 DEG C；
Sintering temperature described in step (6) is 2250~2450 DEG C.
5. a kind of preparation method of oval polarization maintaining optical fibre according to claim 4, which is characterized in that prefabricated after etching
When stick stress region layer is in butterfly junction type；The diameter of elliptical fiber prefabricated rods obtained is 15~18mm, the rotation speed of spin draw machine
Degree is 1000r/min, and rotation intercept is 5~6mm, and drawing speed is 5~6m/min；
When prefabricated rods stress region layer after etching is in panda type, the diameter of elliptical fiber prefabricated rods obtained is 40~45mm,
The rotation speed of spin draw machine is 2000r/min, and rotation intercept is 4~5mm, and drawing speed is 8~10m/min.
6. a kind of preparation method of oval polarization maintaining optical fibre according to claim 4, which is characterized in that step (1)~(2) and
In step (4)~(5), the prefabricated rods surrounding layer of deposition, prefabricated rods stress region layer, prefabricated rods inner cladding and stick sandwich layer thickness it
Than for (1.2~1.5): (3~5): 2:(0.3~0.4).
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