CN105985015A - Elliptical core polarization maintaining optical fiber and manufacturing method thereof - Google Patents
Elliptical core polarization maintaining optical fiber and manufacturing method thereof Download PDFInfo
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- CN105985015A CN105985015A CN201510092751.5A CN201510092751A CN105985015A CN 105985015 A CN105985015 A CN 105985015A CN 201510092751 A CN201510092751 A CN 201510092751A CN 105985015 A CN105985015 A CN 105985015A
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Abstract
The invention discloses an elliptical core polarization maintaining optical fiber and a manufacturing method thereof. The manufacturing method comprises the steps that a core rod is manufactured through a chemical vapor deposition method and comprises a cladding layer and a core layer; a target rod of which the cross section is of a rhombus structure is manufactured and placed in a quartz glass casing pipe, the quartz glass casing pipe is deposited by adopting an outward spray process, and a pure quartz glass rhombus inner hole casing pipe is formed after the target rod is removed; the cladding layer of the core rod is mechanically machined, the core rod is placed in the deposited quartz glass casing pipe to enable the circular outer surface of the cladding layer of the core rod to be tangent to the inner surface of the pure quartz glass rhombus inner hole casing pipe, and then a polarization maintaining optical fiber preform is formed; the polarization maintaining optical fiber preform is subjected to melting shrinkage, stretched and then subjected to mechanical outer circle grinding and polishing to form a polarization maintaining preform, and the polarization maintaining preform is drawn into the elliptical core polarization maintaining optical fiber. Accordingly, the machining precision of the elliptical core polarization maintaining optical fiber is improved, and the elliptical core polarization maintaining optical fiber with the higher stability is obtained. Elliptical core polarization maintaining optical fibers with various application wavelengths and cladding layer diameters can be manufactured.
Description
Technical field
The invention belongs to optical fiber fabrication arts, particularly relate to a kind of oval core polarization maintaining optical fibre and manufacture method thereof.
Background technology
Polarization maintaining optical fibre is one of sensing element of optical fibre gyro, also it is critical that communication and sensing element.Oval core polarization maintaining optical fibre is as a class important component part of polarization maintaining optical fibre, and its wide applicability is its big advantage.Owing to optical fibre gyro (Fiber Optical Gyroscope) has that volume is little, lightweight, mechanical moving component, starts the features such as fast, dynamic error is little, reliability is high, life-span length, it it is unrivaled inertial sensor, there is the trend progressively replacing existing machinery gyro product and use in a large number, have been widely used for automatically controlling of machine, such as fields such as aircraft and the location navigation of automobile, inertial guidances.Polarization maintaining optical fibre product in the market is mainly panda type structure, panda type polarization-preserving fiber to have high polarization capacity, need to increase the boron doping amount of stress rods, thermal expansion character due to multiple material, the temperature sensitive property of panda type polarization-preserving fiber, and one of development important trend of high-precision optical fiber gyro is to reduce the temperature sensitivity of each assembly.Therefore, there is certain defect when making high-precision optical fiber gyro in panda type polarization-preserving fiber.Oval core polarization maintaining optical fibre processing technology is relatively simple, and its polarization property optimizing polarization maintaining optical fibre is mainly realized by rhombus sleeve structure proportioning, and additionally the feature of its temperature-insensitive can be applicable to the development in high accuracy gyroscope field.
Fibre optic current sensor is the upgraded product that smelting, electricity chemical industry and intelligent grid field are measured for electric current.Electric current metering is one of important technological parameters of power system and the electrolytic industry such as metallurgy, chemical industry.At present, major part enterprise of China mainly uses magnetoelectric induction current transformer and hall effect type direct measuring type current sensor to the measurement of electric current, this current sensor based on electromagnetic induction principle, at aspects such as precision, stability, anti-stray magnetic field interference, the modern metallurgical and development need of electricity chemical industry all can not be met.Polarization maintaining optical fibre is the Primary Component of optical-fiber-type current transformer, crucial Sensitive Apparatus such as ring retard, sensing ring and 1/4th slides there is related application requirement, needs for this oval core polarization maintaining optical fibre to have higher precision, stability to be applicable to the supporting applicable of above-mentioned Sensitive Apparatus.
Summary of the invention
The present invention is directed to the temperature sensitive property of existing polarization maintaining optical fibre stronger, and the problem that optical-fiber-type current transformer, open-loop optical fiber gyro and optical fibre gyro require in terms of precision, stability can not be met, a kind of oval core polarization maintaining optical fibre and manufacture method thereof are provided, improve machining accuracy, it is thus achieved that the oval core polarization maintaining optical fibre that stability is higher.
The technical solution adopted for the present invention to solve the technical problems is: first provide a kind of oval core polarization maintaining optical fibre manufacture method, comprise the following steps, 1) plug is manufactured with chemical vapour deposition technique, plug includes covering and sandwich layer, a diameter of 0.1 ~ the 8mm of sandwich layer, doped chemical is germanium, and refractive index contrast is 0.6% ~ 1.5%；Cladding diameter and sandwich layer diameter ratio are 2:1 ~ 6:1, and covering component is that fluoro-germanium is co-doped with or single fluorine doped, and refractivity is-0.5% ~ 0%；2) making cross section is the target rod of diamond structure, and target rod is placed in the inside of quartz glass sleeve, and target rod is coaxially disposed with quartz glass sleeve, use outer pressure spray process that quartz glass sleeve is deposited, after deposition process completes, remove target rod, form pure quartz glass rhombus internal sheath；3) covering of plug being carried out machining, be placed in post-depositional quartz glass sleeve by plug, the rounded outer surface making the covering of plug is tangent with the inner surface of pure quartz glass rhombus internal sheath, and combination constitutes polarization-preserving fiber preform；4) polarization-preserving fiber preform being carried out collapsing and stretch processing, the polarization-preserving fiber preform after stretching carries out machinery cylindrical polishing and polishing, being formed can the inclined prefabricated rods of guarantor of wire drawing；5) inclined for guarantor prefabricated rods is drawn cone, wire drawing become oval core polarization maintaining optical fibre.
By technique scheme, described in step 3), the covering to plug carries out machining, is specially the covering to plug and the most uniformly cuts or cut or grinding.
By technique scheme, after covering to plug carries out Even Grinding vertically in step 3), grinding face is polished and grinds；After step 4) carries out machinery cylindrical polishing and polishing to the polarization-preserving fiber preform after stretching, it is ground.
By technique scheme, for pure quartz glass rhombus internal sheath, the ratio f of the long and short shaft length of its rhombus is in the range of 2:1 ~ 6:1.
By technique scheme, being stretched high temperature collapsing on tower, be drawn into an inclined prefabricated rods of complete guarantor by polarization-preserving fiber preform, protecting inclined prefabricated rods becomes standard cylindrical structure through cylindrical shaping.
The present invention also provides for a kind of oval core polarization maintaining optical fibre, manufactures plug with chemical vapour deposition technique, and plug includes covering and sandwich layer, a diameter of 0.1 ~ 8mm of sandwich layer, and doped chemical is germanium, and refractive index contrast is 0.6% ~ 1.5%；Cladding diameter and sandwich layer diameter ratio are 2:1 ~ 6:1, and covering component is that fluoro-germanium is co-doped with or single fluorine doped, and refractivity is-0.5% ~ 0%；Making cross section is the target rod of diamond structure, and target rod is placed in the inside of quartz glass sleeve, and target rod is coaxially disposed with quartz glass sleeve, use outer pressure spray process that quartz glass sleeve is deposited, after deposition process completes, remove target rod, form pure quartz glass rhombus internal sheath；The covering of plug being carried out machining, is placed in post-depositional quartz glass sleeve by plug, the rounded outer surface making the covering of plug is tangent with the inner surface of pure quartz glass rhombus internal sheath, and combination constitutes polarization-preserving fiber preform；Polarization-preserving fiber preform carries out collapsing process, and collapsing stretches after processing, and the polarization-preserving fiber preform after stretching carries out machinery cylindrical polishing and polishing, and being formed can the inclined prefabricated rods of guarantor of wire drawing；Inclined for guarantor prefabricated rods is drawn cone, wire drawing become oval core polarization maintaining optical fibre.
By technique scheme, the covering of plug is carried out machining, be specially the covering to plug and the most uniformly cut or cut or grinding.
By technique scheme, after the covering of plug is carried out Even Grinding vertically, grinding face is polished and grinds；After polarization-preserving fiber preform after stretching is carried out machinery cylindrical polishing and polishing, it is ground.
By technique scheme, for pure quartz glass rhombus internal sheath, the ratio f of the long and short shaft length of its rhombus is in the range of 2:1 ~ 6:1.
By technique scheme, being stretched high temperature collapsing on tower, be drawn into an inclined prefabricated rods of complete guarantor by polarization-preserving fiber preform, protecting inclined prefabricated rods becomes standard cylindrical structure through cylindrical shaping.
The beneficial effect comprise that: 1) oval core polarization maintaining optical fibre birefringence is that its temperature sensitivity is preferable owing to the unsymmetry of optical waveguide structure causes, it is adaptable to various application circumstances；2) after polishing, plug is uniform, stronger to the control ability of fiber core ovality.The present invention improves the machining accuracy of oval core polarization maintaining optical fibre, it is thus achieved that the oval core polarization maintaining optical fibre that stability is higher.The oval core polarization maintaining optical fibre of various application wavelength and cladding diameter can be manufactured.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of oval core polarization maintaining optical fibre in the embodiment of the present invention；
Fig. 2 is the structure of plug in the embodiment of the present invention；
Fig. 3 is the machining schematic diagram of plug in the embodiment of the present invention；
Fig. 4 is the structural representation of pure quartz glass rhombus internal sheath in the embodiment of the present invention；
Fig. 5 is that in the embodiment of the present invention, plug combines schematic diagram with pure quartz glass rhombus internal sheath；
Fig. 6 is polarization-preserving fiber preform collapsing schematic diagram in the embodiment of the present invention；
Fig. 7 is to the comparison diagram before and after polarization-preserving fiber preform machinery cylindrical polishing after collapsing in the embodiment of the present invention；
Fig. 8 is the structure protecting inclined prefabricated rods in the embodiment of the present invention.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
First the embodiment of the present invention provides a kind of oval core polarization maintaining optical fibre manufacture method, comprises the following steps, 1) manufacture plug with chemical vapour deposition technique, plug includes covering and sandwich layer, a diameter of 0.1 ~ the 8mm of sandwich layer, doped chemical is germanium, and refractive index contrast is 0.6% ~ 1.5%；Cladding diameter and sandwich layer diameter ratio are 2:1 ~ 6:1, and covering component is that fluoro-germanium is co-doped with or single fluorine doped, and refractivity is-0.5% ~ 0%；2) making cross section is the target rod of diamond structure, and target rod is placed in the inside of quartz glass sleeve, and target rod is coaxially disposed with quartz glass sleeve, use outer pressure spray process that quartz glass sleeve is deposited, after deposition process completes, remove target rod, form pure quartz glass rhombus internal sheath；3) covering of plug being carried out machining, be placed in post-depositional quartz glass sleeve by plug, the rounded outer surface making the covering of plug is tangent with the inner surface of pure quartz glass rhombus internal sheath, and combination constitutes polarization-preserving fiber preform；4) polarization-preserving fiber preform being carried out collapsing and stretch processing, the polarization-preserving fiber preform after stretching carries out machinery cylindrical polishing and polishing, being formed can the inclined prefabricated rods of guarantor of wire drawing；5) inclined for guarantor prefabricated rods is drawn cone, wire drawing become oval core polarization maintaining optical fibre.In the preferred embodiment, a diameter of 2.0mm of sandwich layer, doped chemical is germanium, and refractive index contrast is 1.2%；Its cladding diameter is 6.0mm, and covering component is single fluorine doped, and refractivity is-0.5%.
Wherein covering to plug described in step 3) carries out machining, is specifically as follows the covering to plug and the most uniformly cuts or cut or grinding.Further, after covering to plug carries out Even Grinding vertically in step 3), grinding face is polished and grinds；After step 4) carries out machinery cylindrical polishing and polishing to the polarization-preserving fiber preform after stretching, it is ground.
Further, for pure quartz glass rhombus internal sheath, the ratio f of the long and short shaft length of its rhombus is in the range of 2:1 ~ 6:1.It is possible to further stretched high temperature collapsing on tower, be drawn into an inclined prefabricated rods of complete guarantor by polarization-preserving fiber preform, protecting inclined prefabricated rods becomes standard cylindrical structure through cylindrical shaping.
The present invention also provides for a kind of oval core polarization maintaining optical fibre, manufactures plug with chemical vapour deposition technique, and plug includes covering and sandwich layer, a diameter of 0.1 ~ 8mm of sandwich layer, and doped chemical is germanium, and refractive index contrast is 0.6% ~ 1.5%；Cladding diameter and sandwich layer diameter ratio are 2:1 ~ 6:1, and covering component is that fluoro-germanium is co-doped with or single fluorine doped, and refractivity is-0.5% ~ 0%；Making cross section is the target rod of diamond structure, and target rod is placed in the inside of quartz glass sleeve, and target rod is coaxially disposed with quartz glass sleeve, use outer pressure spray process that quartz glass sleeve is deposited, after deposition process completes, remove target rod, form pure quartz glass rhombus internal sheath；The covering of plug being carried out machining, is placed in post-depositional quartz glass sleeve by plug, the rounded outer surface making the covering of plug is tangent with the inner surface of pure quartz glass rhombus internal sheath, and combination constitutes polarization-preserving fiber preform；Polarization-preserving fiber preform carries out collapsing process, and collapsing stretches after processing, and the polarization-preserving fiber preform after stretching carries out machinery cylindrical polishing and polishing, formed can the inclined prefabricated rods of guarantor of wire drawing, as shown in Figure 8；Inclined for guarantor prefabricated rods being drawn cone, cleans, wire drawing becomes oval core polarization maintaining optical fibre, and its structure is as shown in Figure 1.In the preferred embodiment, a diameter of 2.0mm of sandwich layer, doped chemical is germanium, and refractive index contrast is 1.2%；Its cladding diameter is 6.0mm, and covering component is single fluorine doped, and refractivity is-0.5%.
Wherein, the covering of plug is carried out machining, be specifically as follows the covering to plug and the most uniformly cut or cut or grinding.Further, after the covering of plug is carried out Even Grinding vertically, grinding face is polished and grinds；After polarization-preserving fiber preform after stretching is carried out machinery cylindrical polishing and polishing, it is ground.
Wherein, for pure quartz glass rhombus internal sheath, the ratio f of the long and short shaft length of its rhombus is in the range of 2:1 ~ 6:1, and specifically the ratio f of the long and short shaft length of its rhombus can select 3:1.Further, being stretched high temperature collapsing on tower, be drawn into an inclined prefabricated rods of complete guarantor by polarization-preserving fiber preform, protecting inclined prefabricated rods becomes standard cylindrical structure through cylindrical shaping.
In the preferred embodiment, embodiment 1 is also provided for: as in figure 2 it is shown, the plug 4 that oval core polarization maintaining optical fibre is used includes the sandwich layer part 5 of high index of refraction and the transition covering 6 of relatively low-refraction, covering 7 is pure quartz glass.Using chemical vapor deposition plug, its center core layer 5 part is to mix germanium quartz glass, wherein, germanium volume, than for 1:2.32, has higher light refractive index, a diameter of c, transition covering 6 is that fluorine silicon is co-doped with quartz glass, wherein, fluosilicic volume ratio is 1:0.25, and the purer quartz glass of refractive index is lower slightly, a diameter of d, covering 7 is pure silicate glass, and a part is by chemical gaseous phase formation of deposits, and another part is quartz liner material.As it is shown on figure 3, dotted line represents the plug profile before machining, the plug cylindrical that deposition collapsing completes is processed into 8, and whole process is the part grinding away covering 7, a diameter of e after grinding.Processing through grinding and polishing, the plug of Excircle machining is formed again.
In the preferred embodiment, also providing for embodiment 2: as shown in Figure 4, rhombus endoporus quartz socket tube 9 comprises the rhombus endoporus 10 of pure silicon quartz glass 11 and rule.As it is shown on figure 3, the plug cylindrical that deposition collapsing completes is processed into 8, whole process is the part grinding away covering 7, a diameter of e after grinding.As it is shown in figure 5, the plug 8 of cylindrical and polishing processing is inserted endoporus 10, now the cylindrical of plug 8 matches with the diamond-shaped cross-section of endoporus 10, forms combination prefabricated rods 12.As shown in Figure 6, polarization-preserving fiber preform 12 is formed after collapsing can the inclined prefabricated rods of guarantor 13 of wire drawing, wherein plug 8 forms oval structure 8 through crimp, oval core district is germnium doped core floor 5, transverse width is f, oval transition clad region is fluorine silicon codoping layer 6, and transverse width is g, and it is h that plug reserves the transverse width of pure silicon layer.As it is shown in fig. 7, it is oval structure profile that the ellipse after collapsing protects inclined prefabricated rods 13, reaming part of clad 11 through peripheral milling, the ellipse forming standard cylindrical structure protects inclined prefabricated rods 15, now protects a diameter of k of inclined prefabricated rods 15.
In the preferred embodiment, also provide for embodiment 3: as shown in Figure 2 and Figure 3, core shift rod is protected by chemical vapor deposition, its center core layer 5 part is to mix germanium quartz glass, has higher light refractive index, a diameter of c, transition covering 6 is that fluorine silicon is co-doped with quartz glass, the purer quartz glass of refractive index is lower slightly, a diameter of d, and covering 7 is pure silicate glass.As it is shown in figure 5, the plug 8 of cylindrical and polishing processing is inserted endoporus 10, now the cylindrical of plug 8 matches with the diamond-shaped cross-section of endoporus 10, forms combination prefabricated rods 12.As shown in Figure 6, polarization-preserving fiber preform 12 is formed after collapsing can the inclined prefabricated rods of guarantor 13 of wire drawing, wherein plug 8 forms oval structure 8 through crimp, oval core district is germnium doped core floor 5, transverse width is f, oval transition clad region is fluorine silicon codoping layer 6, and transverse width is g, and it is h that plug reserves the transverse width of pure silicon layer.As it is shown in fig. 7, it is oval structure profile that the ellipse after collapsing protects inclined prefabricated rods 13, reaming part of clad 11 through peripheral milling, the ellipse forming standard cylindrical structure protects inclined prefabricated rods 15, now protects a diameter of k of inclined prefabricated rods 15.If needing to become less external diameter prefabricated rods by protecting inclined preform bar stretching.As it is shown in figure 1, use the polarization maintaining optical fibre of this method manufacture by optimizing axial ratio a:b of fibre core 2, typical case, than being 2:1, can obtain going out to clap length less than 6mm, 2m cross-talk more than 25dB/km, the decay polarization maintaining optical fibre less than 1 dB/km in operation wavelength 1310nm.Other parameters of this ellipse core polarization maintaining optical fibre meet the standard of relevant polarization maintaining optical fibre product.Relevant all-fiber current transformator, open-loop optical fiber gyro and the requirement in high-precision optical fiber gyro field can be met completely.
It should be appreciated that for those of ordinary skills, can be improved according to the above description or be converted, and all these modifications and variations all should be belonged to the protection domain of claims of the present invention.
Claims (10)
1. an oval core polarization maintaining optical fibre manufacture method, it is characterised in that comprise the following steps, 1) manufacture plug with chemical vapour deposition technique, plug includes covering and sandwich layer, a diameter of 0.1 ~ 8mm of sandwich layer, and doped chemical is germanium, and refractive index contrast is 0.6% ~ 1.5%；Cladding diameter and sandwich layer diameter ratio are 2:1 ~ 6:1, and covering component is that fluoro-germanium is co-doped with or single fluorine doped, and refractivity is-0.5% ~ 0%；2) making cross section is the target rod of diamond structure, and target rod is placed in the inside of quartz glass sleeve, and target rod is coaxially disposed with quartz glass sleeve, use outer pressure spray process that quartz glass sleeve is deposited, after deposition process completes, remove target rod, form pure quartz glass rhombus internal sheath；3) covering of plug being carried out machining, be placed in post-depositional quartz glass sleeve by plug, the rounded outer surface making the covering of plug is tangent with the inner surface of pure quartz glass rhombus internal sheath, and combination constitutes polarization-preserving fiber preform；4) polarization-preserving fiber preform being carried out collapsing and stretch processing, the polarization-preserving fiber preform after stretching carries out machinery cylindrical polishing and polishing, being formed can the inclined prefabricated rods of guarantor of wire drawing；5) inclined for guarantor prefabricated rods is drawn cone, wire drawing become oval core polarization maintaining optical fibre.
Oval core polarization maintaining optical fibre manufacture method the most according to claim 1, it is characterised in that described in step 3), the covering to plug carries out machining, is specially the covering to plug and the most uniformly cuts or cut or grinding.
Oval core polarization maintaining optical fibre manufacture method the most according to claim 2, it is characterised in that after covering to plug carries out Even Grinding vertically in step 3), grinding face is polished and grinds；After step 4) carries out machinery cylindrical polishing and polishing to the polarization-preserving fiber preform after stretching, it is ground.
Oval core polarization maintaining optical fibre manufacture method the most according to claim 1 and 2, it is characterised in that for pure quartz glass rhombus internal sheath, the ratio f of the long and short shaft length of its rhombus is in the range of 2:1 ~ 6:1.
Oval core polarization maintaining optical fibre manufacture method the most according to claim 4, it is characterised in that being stretched high temperature collapsing on tower, be drawn into an inclined prefabricated rods of complete guarantor by polarization-preserving fiber preform, protecting inclined prefabricated rods becomes standard cylindrical structure through cylindrical shaping.
6. an oval core polarization maintaining optical fibre, it is characterized in that, plug is manufactured with chemical vapour deposition technique, plug includes covering and sandwich layer, a diameter of 0.1 ~ 8mm of sandwich layer, and doped chemical is germanium, refractive index contrast is 0.6% ~ 1.5%, cladding diameter and sandwich layer diameter ratio are 2:1 ~ 6:1, and covering component is that fluoro-germanium is co-doped with or single fluorine doped, and refractivity is-0.5% ~ 0%；Making cross section is the target rod of diamond structure, and target rod is placed in the inside of quartz glass sleeve, and target rod is coaxially disposed with quartz glass sleeve, use outer pressure spray process that quartz glass sleeve is deposited, after deposition process completes, remove target rod, form pure quartz glass rhombus internal sheath；The covering of plug being carried out machining, is placed in post-depositional quartz glass sleeve by plug, the rounded outer surface making the covering of plug is tangent with the inner surface of pure quartz glass rhombus internal sheath, and combination constitutes polarization-preserving fiber preform；Polarization-preserving fiber preform being carried out collapsing and stretch processing, the polarization-preserving fiber preform after stretching carries out machinery cylindrical polishing and polishing, being formed can the inclined prefabricated rods of guarantor of wire drawing；Inclined for guarantor prefabricated rods is drawn cone, wire drawing become oval core polarization maintaining optical fibre.
Oval core polarization maintaining optical fibre the most according to claim 6, it is characterised in that the covering of plug is carried out machining, is specially the covering to plug and the most uniformly cuts or cut or grinding.
Oval core polarization maintaining optical fibre the most according to claim 7, it is characterised in that after the covering of plug is carried out Even Grinding vertically, grinding face is polished and grinds；After polarization-preserving fiber preform after stretching is carried out machinery cylindrical polishing and polishing, it is ground.
9. according to the oval core polarization maintaining optical fibre described in claim 6 or 7, it is characterised in that for pure quartz glass rhombus internal sheath, the ratio f of the long and short shaft length of its rhombus is in the range of 2:1 ~ 6:1.
Oval core polarization maintaining optical fibre the most according to claim 9, it is characterised in that being stretched high temperature collapsing on tower, be drawn into an inclined prefabricated rods of complete guarantor by polarization-preserving fiber preform, protecting inclined prefabricated rods becomes standard cylindrical structure through cylindrical shaping.
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| CN107151093A (en) * | 2017-06-27 | 2017-09-12 | 长飞光纤光缆股份有限公司 | The preparation method and device of a kind of preform |
| CN110244405A (en) * | 2019-06-18 | 2019-09-17 | 烽火通信科技股份有限公司 | A kind of multiband bow-tie type polarization maintaining optical fibre |
| CN110346865A (en) * | 2019-06-12 | 2019-10-18 | 烽火通信科技股份有限公司 | A kind of polarization maintaining optical fibre that multiband uses |
| WO2021016719A1 (en) * | 2019-07-31 | 2021-02-04 | Huawei Technologies Canada Co., Ltd. | Polarization-maintaining highly elliptical core fiber with stress-induced birefringence |
| CN113698090A (en) * | 2021-09-01 | 2021-11-26 | 北京热刺激光技术有限责任公司 | Optical fiber preform, homogenized optical fiber, and preparation method and application thereof |
| CN113716856A (en) * | 2020-05-25 | 2021-11-30 | 中天科技精密材料有限公司 | Optical fiber preform manufacturing equipment and method and optical fiber preform |
| CN114349328A (en) * | 2022-01-18 | 2022-04-15 | 江苏亨通光导新材料有限公司 | Simple section structure polarization maintaining parent metal and efficient preparation method thereof |
| CN114956543A (en) * | 2022-08-03 | 2022-08-30 | 武汉理工大学 | Prefabricated rod of elliptical core polarization maintaining optical fiber and preparation method of optical fiber |
| CN115385566A (en) * | 2022-09-27 | 2022-11-25 | 武汉长盈通光电技术股份有限公司 | Method for preparing elliptical core optical fiber prefabricated rod |
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| CN107151093A (en) * | 2017-06-27 | 2017-09-12 | 长飞光纤光缆股份有限公司 | The preparation method and device of a kind of preform |
| CN110346865A (en) * | 2019-06-12 | 2019-10-18 | 烽火通信科技股份有限公司 | A kind of polarization maintaining optical fibre that multiband uses |
| CN110244405A (en) * | 2019-06-18 | 2019-09-17 | 烽火通信科技股份有限公司 | A kind of multiband bow-tie type polarization maintaining optical fibre |
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| CN114072711A (en) * | 2019-07-31 | 2022-02-18 | 华为技术加拿大有限公司 | Polarization-maintaining high-ellipse core optical fiber with stress-induced birefringence |
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| CN113716856A (en) * | 2020-05-25 | 2021-11-30 | 中天科技精密材料有限公司 | Optical fiber preform manufacturing equipment and method and optical fiber preform |
| CN113698090A (en) * | 2021-09-01 | 2021-11-26 | 北京热刺激光技术有限责任公司 | Optical fiber preform, homogenized optical fiber, and preparation method and application thereof |
| CN114349328A (en) * | 2022-01-18 | 2022-04-15 | 江苏亨通光导新材料有限公司 | Simple section structure polarization maintaining parent metal and efficient preparation method thereof |
| CN114956543A (en) * | 2022-08-03 | 2022-08-30 | 武汉理工大学 | Prefabricated rod of elliptical core polarization maintaining optical fiber and preparation method of optical fiber |
| CN114956543B (en) * | 2022-08-03 | 2022-10-11 | 武汉理工大学 | Prefabricated rod of elliptical core polarization maintaining optical fiber and preparation method of optical fiber |
| CN115385566A (en) * | 2022-09-27 | 2022-11-25 | 武汉长盈通光电技术股份有限公司 | Method for preparing elliptical core optical fiber prefabricated rod |
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