CN116081939A - Preparation method of elliptical core polarization-maintaining optical fiber - Google Patents

Preparation method of elliptical core polarization-maintaining optical fiber Download PDF

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Publication number
CN116081939A
CN116081939A CN202211732076.4A CN202211732076A CN116081939A CN 116081939 A CN116081939 A CN 116081939A CN 202211732076 A CN202211732076 A CN 202211732076A CN 116081939 A CN116081939 A CN 116081939A
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Prior art keywords
mandrel
core
optical fiber
rod
flame
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CN202211732076.4A
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Chinese (zh)
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徐丹
张子豪
朱杰
薛迟谷
苏武
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Jiangsu Fasten Optoelectronics Technology Co ltd
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Jiangsu Fasten Optoelectronics Technology Co ltd
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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
    • C03B37/025—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
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • 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]
    • C03B37/01466—Means for changing or stabilising the diameter or form of tubes or rods
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)

Abstract

The invention relates to a preparation method of an elliptic core polarization maintaining optical fiber, belonging to the field of optical fiber preparation, comprising the following steps: step one, preparing a quartz tube, depositing a core layer loose body in the tube, and then, depositing a core layer to form a core rod in a hollow state, and subsequently, completing the solidification of a core layer area through collapse; secondly, collapsing the mandrel from the symmetrical surface of the mandrel by adopting double symmetrical flames, wherein the mandrel does not rotate in the collapsing process, the mandrel is horizontally placed in the collapsing process, meanwhile, negative pressure is pumped in the central hole to accelerate the collapsing process, and the horizontal symmetrical flame blast lamp mainly heats the short axis direction of the elliptical mandrel, so that an elliptical mandrel is finally formed; step three, shaping and polishing the outer circle of the collapsed core rod to form a cylindrical core rod, sleeving a quartz sleeve on the outer part of the core rod, and burning to form an optical fiber mother rod; and step four, drawing the optical fiber mother rod to form the elliptic core polarization maintaining optical fiber.

Description

Preparation method of elliptical core polarization-maintaining optical fiber
Technical Field
The invention belongs to the field of optical fiber manufacturing, and particularly relates to a preparation method of an elliptical core polarization-maintaining optical fiber.
Background
The polarization maintaining fiber is an optical fiber with strong polarization maintaining capability for linearly polarized light. Because of its good polarization state maintaining capability, it is widely used in optical fiber sensing and various polarization coherent detectors. According to different modes of birefringence, the polarization maintaining fiber can be divided into stress polarization maintaining fiber and geometric polarization maintaining fiber. The geometrical polarization maintaining fiber mainly generates a double refraction effect due to the change of the refractive index of the fiber material caused by the asymmetry of the material geometry, such as an elliptical core polarization maintaining fiber, generally, the ellipticity e of the elliptical core polarization maintaining fiber is calculated as e=a/b, wherein a is the length of the major axis of the ellipse, and b is the length of the minor axis of the ellipse; the manufacturing process of the elliptic core polarization maintaining optical fiber is simpler, in addition, the birefringence of the elliptic core polarization maintaining optical fiber is mainly caused by geometric birefringence, and compared with the stress type polarization maintaining optical fiber, the geometric birefringence of the elliptic core polarization maintaining optical fiber has the characteristics of good stability and temperature independence.
The document of patent publication No. CN113698091A discloses a preparation process of an elliptic core polarization maintaining optical fiber, which comprises the steps of preparing a quartz rod, symmetrically forming N holes penetrating the whole quartz rod along the axis of the quartz rod, wherein N is more than or equal to 2; cleaning the quartz rod, and depositing a core layer on the inner wall of the hole; collapsing the deposited quartz rod to prepare a solid elliptical core rod; according to actual needs, a quartz sleeve can be sleeved on the periphery of the solid elliptic core rod, and fusion shrinkage and stretching treatment are carried out to obtain the elliptic core polarization maintaining optical fiber preform. And (3) punching N symmetrical continuous holes in the axis of the quartz rod in a mode of punching the quartz rod, and then performing core rod deposition collapse. In the actual core rod deposition process, due to the fact that ovality of the holes is large, uneven deposition of core layer materials can occur, parameters of the core layer are abnormal, refractive index of the core layer cannot be accurately controlled, and finally parameters of the drawn optical fiber cannot be stably and controllably controlled.
The document of patent publication number CN107417090a discloses a method for manufacturing an elliptical core polarization-maintaining optical fiber, (1) manufacturing a single-mode preform by chemical vapor deposition, the single-mode preform comprising a cladding layer and a core layer; two through holes are respectively formed on two sides of the core layer, and the two through holes are symmetrically distributed on two sides of the core layer; (2) Vacuum high-temperature melting and shrinking the single-mode preform rod subjected to the hole opening in the step (1) on an extension tower to form a complete solid polarization-preserving preform rod; (3) Performing mechanical excircle grinding and polishing on the polarization maintaining optical fiber preform manufactured by extension in the step (2) to ensure the roundness of an optical fiber cladding, so as to form a fiber-drawing polarization maintaining preform; (4) And (3) tapering and drawing the polarization-preserving preformed rod prepared in the step (3) to prepare the finished elliptic core polarization-preserving optical fiber. The method can realize the preparation of the low-ellipticity elliptical core polarization maintaining fiber, but has certain difficulty in realizing the preparation of the high-ellipticity polarization maintaining fiber.
Disclosure of Invention
The invention aims to provide a preparation method of an elliptical core polarization-maintaining optical fiber, so as to obtain the elliptical core polarization-maintaining optical fiber with high ellipticity.
The invention solves the problems by adopting the following technical scheme: a method for preparing elliptical core polarization-maintaining optical fiber comprises,
step one, preparing a quartz tube, depositing a core layer loose body in the tube, and then depositing the core layer to form a core rod in a hollow state, and subsequently completing the solidification of a core layer area through collapse.
Secondly, collapsing the mandrel from the symmetrical surface of the mandrel by adopting double symmetrical flames, wherein the mandrel does not rotate in the collapsing process, the mandrel is horizontally placed in the collapsing process, meanwhile, negative pressure is pumped in the central hole to accelerate the collapsing process, and the horizontal symmetrical flame blast lamp mainly heats the short axis direction of the elliptical mandrel, so that an elliptical mandrel is finally formed; the larger the central hole of the core rod is, the larger the length-axis ratio of the collapsed elliptical core is, the size of the bisymmetric flame is adjusted according to the diameter of the central hole after the core layer is deposited, the flame size is mainly determined according to the diameter of a lampwick of the flame burner, when the diameter of the central hole is larger than 7mm, the flame burner with the diameter of the lampwick of 7mm is selected, and when the diameter of the central hole is smaller than 7mm, the flame burner with the diameter of the lampwick of 5mm is selected.
And thirdly, shaping and polishing the outer circle of the collapsed core rod to form a cylindrical core rod, sleeving a quartz sleeve on the outer part of the core rod, and burning to form the optical fiber mother rod.
And step four, drawing the optical fiber mother rod to form the elliptic core polarization maintaining optical fiber.
Preferably, in the first step, the germanium-doped quartz material is deposited in a tube by adopting a chemical vapor deposition mode, and the oxyhydrogen flame of a lathe is adoptedFor heating source, siCl is introduced into the tube 4 And GeCl 4 The silica and germanium dioxide particles generated by the reaction in the tube are deposited on the inner wall of the quartz tube by utilizing the thermophoresis principle and are vitrified at the same time.
Preferably, in the first step, the material composition of the core layer is SiO 2 、GeO 2 F, adopting a homogeneous doping design, wherein SiO 2 The mol percent of the GeO is 80 to 95 2 The mol percent of F is 5-20, and the mol percent of F is 0.5-2.
Preferably, in the second step, the mandrel is collapsed in two steps, firstly, the mandrel is uniformly collapsed in a manner of rotating flame collapse, the diameter of the central hole is reduced to be smaller, and then, the horizontal symmetrical double-blast lamp is used for symmetrical collapse, and the mandrel is not rotated at this time. Thus, the length of the major axis and the minor axis of the elliptical core can be adjusted.
Compared with the prior art, the invention has the advantages that: according to the method, the core layer is subjected to the preparation process of the normal core rod, the double symmetrical collapse process is added after the core layer is subjected to the deposition, the ovality of the core layer is adjusted through the adjustment of the collapse process on the premise of effectively realizing the uniform deposition, the oval core polarization maintaining rod with stable refractive index, high ovality and controllability of the core layer is finally formed through collapse, and then the oval core polarization maintaining fiber is formed through shaping sleeve wire drawing.
Drawings
FIG. 1 is a schematic view of a post-deposition mandrel in an embodiment of the present invention;
FIG. 2 is a diagram illustrating a double symmetrical collapse in an embodiment of the present invention;
FIG. 3 is a schematic illustration of a mandrel after double symmetrical collapse in an embodiment of the present invention;
in the figure, 1, a quartz cladding layer, 2, a germanium-doped Dan Yingxin layer, 3 and a flame torch.
Detailed Description
The invention is described in further detail below in connection with the following examples, which are exemplary and intended to illustrate the invention, but are not to be construed as limiting the invention.
The preparation method of the elliptic core polarization maintaining optical fiber comprises the following steps of
(1) Mandrel deposition
By using a lathe to carry out chemical vapor deposition on a quartz base tube, the material composition of the fiber core is SiO 2 、GeO 2 F, adopting a homogeneous doping design, wherein SiO 2 The mol percent of the GeO is 80 to 95 2 The mol percent of F is 5-20, and the mol percent of F is 0.5-2; depositing Si Cl corresponding to the core layer 4 Flow rate: 200-300sccm, geCl 4 Flow rate: 300-500sccm, F flow: 1-5sccm. The deposition temperature is 1900-2100 ℃ and the pressure is 0.6-0.8torr. Controlling each parameter by a lathe to control SiO 2 、GeO 2 And depositing on the inner wall of the quartz base pipe to form a hollow preform (core rod).
(2) Mandrel collapse
The mandrel collapse is mainly divided into two steps, and according to the requirements of different length-axis ratios, the diameter of the central hole can be controlled in a conventional rotary flame collapse mode, as in the embodiment 1, the diameter of the central hole is collapsed to 8.71mm in a rotary collapse mode after the core layer deposition is completed, and at the moment, the outer diameter of the mandrel is 20.7mm. Then the horizontal symmetrical double-blast lamp is used for symmetrical collapse, the diameter of a lamp wick is 7mm, and the core rod does not rotate at the moment. And the symmetrical flame collapse is carried out by controlling the flame temperature to 1700 ℃ and combining a mode of pumping negative pressure through the central hole.
(3) Shaping core rod
The collapsed core rod is elliptical, and is required to be shaped by using an outer circle grinding device, and the outer circle of the core rod is ground to be a perfect circle.
(4) Core rod sleeve
The quartz sleeve and the core rod are combined by using a sleeve lathe, and the quartz sleeve and the core rod are sintered by using flame to form an elliptic core preform.
(5) Female stick wire drawing
And drawing the elliptical core preform by using an optical fiber drawing tower to obtain the qualified elliptical core polarization-maintaining optical fiber.
Main parameters Example 1 Example 2 Example 3
Core rod outer diameter 20.7mm 20mm 19mm
Core layer thickness 0.2mm 0.26mm 0.54mm
Diameter of center hole 8.71mm 6.87mm 2.86mm
Burner wick size 7mm 5mm 5mm
Flame temperature 1700℃ 1700℃ 1700℃
Long-short axial ratio 5/1 4/1 3/1
Optical fiber beat length 4mm 5mm 10mm
Vacuum degree 100mbar 100mabr 100mar
In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions that are formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.

Claims (4)

1. A preparation method of an elliptic core polarization maintaining optical fiber is characterized in that: comprising the steps of (a) a step of,
step one, preparing a quartz tube, depositing a core layer loose body in the tube, and then, depositing a core layer to form a core rod in a hollow state, and subsequently, completing the solidification of a core layer area through collapse;
secondly, collapsing the mandrel from the symmetrical surface of the mandrel by adopting double symmetrical flames, wherein the mandrel does not rotate in the collapsing process, the mandrel is horizontally placed in the collapsing process, meanwhile, negative pressure is pumped in the central hole to accelerate the collapsing process, and the horizontal symmetrical flame blast lamp mainly heats the short axis direction of the elliptical mandrel, so that an elliptical mandrel is finally formed; the larger the central hole of the core rod is, the larger the length-axis ratio of the collapsed elliptical core is, the size of the bisymmetric flame is adjusted according to the diameter of the central hole after the core layer is deposited, the flame size is mainly determined according to the diameter of a lampwick of the flame burner, when the diameter of the central hole is larger than 7mm, the flame burner with the diameter of the lampwick of 7mm is selected, and when the diameter of the central hole is smaller than 7mm, the flame burner with the diameter of the lampwick of 5mm is selected;
step three, shaping and polishing the outer circle of the collapsed core rod to form a cylindrical core rod, sleeving a quartz sleeve on the outer part of the core rod, and burning to form an optical fiber mother rod;
and step four, drawing the optical fiber mother rod to form the elliptic core polarization maintaining optical fiber.
2. The method according to claim 1, characterized in that: in the first step, chemical vapor deposition is adopted to deposit germanium doped quartz material inside the tube, and SiCl is introduced into the tube with oxyhydrogen flame of lathe as heating source 4 And GeCl 4 The silica and germanium dioxide particles generated by the reaction in the tube are deposited on the inner wall of the quartz tube by utilizing the thermophoresis principle and are vitrified at the same time.
3. The method according to claim 1 or 2, characterized in that: in the first step, the material composition of the core layer is SiO 2 、GeO 2 F, adopting a homogeneous doping design, wherein SiO 2 The mol percent of the GeO is 80 to 95 2 The mol percent of F is 5-20, and the mol percent of F is 0.5-2.
4. The method according to claim 1, characterized in that: in the second step, the mandrel is collapsed into two steps, firstly, the mandrel is uniformly collapsed in a manner of mandrel rotating flame collapse, the diameter of the central hole is reduced, and then, the horizontal symmetrical double-blast lamp is used for symmetrical collapse, and the mandrel does not rotate at the moment.
CN202211732076.4A 2022-12-30 2022-12-30 Preparation method of elliptical core polarization-maintaining optical fiber Pending CN116081939A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117285247A (en) * 2023-11-28 2023-12-26 上海康阔光智能技术有限公司 Method for manufacturing polarization maintaining optical fiber

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117285247A (en) * 2023-11-28 2023-12-26 上海康阔光智能技术有限公司 Method for manufacturing polarization maintaining optical fiber

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