CN113466989A - Chiral coupling fiber core optical fiber and preparation method thereof - Google Patents
Chiral coupling fiber core optical fiber and preparation method thereof Download PDFInfo
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- CN113466989A CN113466989A CN202110760974.XA CN202110760974A CN113466989A CN 113466989 A CN113466989 A CN 113466989A CN 202110760974 A CN202110760974 A CN 202110760974A CN 113466989 A CN113466989 A CN 113466989A
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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
- G02B6/02042—Multicore optical fibres
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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
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01211—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
- C03B37/01222—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube for making preforms of multiple core optical fibres
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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
- C03B37/025—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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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/34—Plural core other than bundles, e.g. double core
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/06—Rotating the fibre fibre about its longitudinal axis
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/40—Monitoring or regulating the draw tension or draw rate
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Abstract
The chiral coupling fiber core comprises a central fiber core, two satellite fiber cores and an inner cladding from inside to outside, wherein the two satellite fiber cores are symmetrically arranged between the central fiber core and the inner cladding. The application also provides a preparation method of the chiral coupling fiber core optical fiber. According to the chiral coupling fiber core optical fiber and the preparation method thereof, the two satellite fiber cores are symmetrically arranged around the central fiber core, so that the symmetry and consistency of the double satellite fiber cores are guaranteed, the beam quality of the chiral coupling fiber core optical fiber is improved, the chiral coupling fiber core optical fiber can be suitable for active gain optical fibers with higher absorption and higher power, and can be applied to various short optical fibers and high-power optical fiber lasers.
Description
Technical Field
The invention relates to the field of optical fibers, in particular to a chiral coupling fiber core optical fiber and a preparation method thereof.
Background
The conventional chiral coupling core fiber generally consists of a core located in the center of a quartz cladding material and a satellite core spirally surrounding the core. Although the chiral coupling core fiber can inhibit the transmission of a high-order mode in the fiber, the high-order mode filtering capability of the chiral coupling core fiber is limited, and the quality of the conventional chiral coupling core fiber needs to be further improved.
Disclosure of Invention
In view of the above, it is desirable to provide a chiral coupling core fiber and a method for manufacturing the same, which can improve the quality of the chiral coupling core fiber.
The chiral coupling fiber core optical fiber comprises a central fiber core, two satellite fiber cores and an inner cladding from inside to outside, wherein the two satellite fiber cores are symmetrically arranged between the central fiber core and the inner cladding.
Further, the novel electric heating cooker also comprises an outer wrapping layer, wherein the outer wrapping layer is positioned outside the inner wrapping layer.
Further, the diameter of the central core is a0, the diameter of the satellite core is a1, the core-to-core distance between the central core and the satellite core is d, and the relation d < a0+ a1 is satisfied, the diameter of the inner cladding is b1, the diameter of the outer cladding is b2, the refractive indexes of the central core, the satellite core, the inner cladding and the outer cladding are n1, n2, n3 and n4 respectively, and the relations n1 > n3 > n4 and n2 > n3 are satisfied.
Further, the outer cladding layer is made of pure quartz glass material or acrylic resin low refractive index paint.
Furthermore, the satellite fiber core is of a constant-pitch rotating structure, the pitch of the satellite fiber core is p, and p is more than 2mm and less than 10 mm.
Further, the central core is a glass material doped with one or more of Tm, Nd, Yb, Al, Ge, Ce, P and F.
A method for preparing a chiral coupling core fiber, which is used for preparing the chiral coupling core fiber, comprises the following steps:
providing a central fiber core prefabricated rod and two satellite fiber core prefabricated rods;
providing an inner cladding preform;
punching the inner cladding preform according to the sizes of the central fiber core preform and the two satellite fiber core preforms, wherein the number of the holes is three to accommodate the central fiber core preform and the two satellite fiber core preforms;
assembling the perforated inner cladding prefabricated rod with a central fiber core prefabricated rod and two satellite fiber core prefabricated rods, and connecting the inner cladding prefabricated rods with an external pressure control vacuum pump through a tail end sleeve handle and a specially-made Teflon airtight valve, wherein the two satellite fiber core prefabricated rods are symmetrically arranged around the central fiber core;
and carrying out high-speed rotating drawing on the assembled prefabricated rod to form the chiral coupling fiber core optical fiber of the double-satellite fiber core.
Furthermore, a central fiber core preform is prepared by depositing a matrix material and a doping material in an MCVD (micro chemical vapor deposition) or PCVD (plasma chemical vapor deposition) tube, and a satellite fiber core preform is prepared by depositing the matrix material and the doping material in the PCVD tube.
Furthermore, the diameter of the hole punched in the central fiber core preform is larger than that of the satellite fiber core, and the difference value of the two diameters is 0.2-0.5 mm.
Furthermore, the wire drawing temperature of the high-speed rotating wire drawing is 1700-1900 ℃, the wire drawing speed is 3-30 m/min, the wire drawing tension is 0.5-2N, and the high-speed rotating speed is 0-1500 r/min.
According to the chiral coupling fiber core optical fiber and the preparation method, the two satellite fiber cores are symmetrically arranged around the central fiber core, so that the symmetry and consistency of the double satellite fiber cores are guaranteed, the beam quality of the chiral coupling fiber core optical fiber is improved, the chiral coupling fiber core optical fiber can be applied to active gain optical fibers with higher absorption and higher power, and can be applied to various short optical fibers and high-power optical fiber lasers.
Drawings
FIG. 1 is a cross-sectional view of one embodiment of a chiral coupled-core optical fiber as provided herein.
Fig. 2 is a schematic diagram of the structure of the satellite core of fig. 1.
Fig. 3 is a flow chart of a method for making a chiral coupled-core optical fiber according to the present disclosure.
Fig. 4 is a schematic diagram of step S34 in fig. 3.
Description of the main elements
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings.
In order that the above objects, features and advantages of the present invention can be more clearly understood, a detailed description of the present invention will be given below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, fig. 1 is a cross-sectional view of a chiral coupled-core optical fiber 20 according to one embodiment of the present disclosure. The chiral coupling core fiber 20 includes a central core 21, two satellite cores 22, an inner cladding 23 and an outer cladding 24 from inside to outside, and the two satellite cores 22 are symmetrically located between the central core 21 and the inner cladding 23.
The diameter of the central core 21 is a0, the diameter of the satellite core 22 is a1, the core-to-core distance between the central core 21 and the satellite core 22 is d, and the relation d < a0+ a1 is satisfied, the diameter of the inner cladding 23 is b1, the diameter of the outer cladding 24 is b2, the refractive indexes of the central core 21, the satellite core 22, the inner cladding 23 and the outer cladding 24 are n1, n2, n3 and n4 respectively, and the relations n1 > n3 > n4 and n2 > n3 are satisfied.
The central fiber core 21 is a glass material doped with one or more of Tm, Nd, Yb, Al, Ge, Ce, P and F. The satellite fiber core 22 is a glass material doped with one or more of Fe, Cu, Ge, P, and F. Referring to FIG. 2, in one embodiment, the satellite core 22 is a constant pitch rotating structure, the pitch of the satellite core 22 is p, and 2mm < p < 10 mm.
The inner cladding 23 is circular. It is understood that the inner cladding 23 is not limited to circular shape, but may have other shapes. The inner cladding 23 is a pure quartz glass material. In one embodiment, the inner cladding 23 is free of other doping elements; in another embodiment, the doping element of the inner cladding 23 is one or more of Ge, P, and F.
The outer wrap 24 is circular. It is understood that the inner cladding 23 is not limited to circular shape, but may have other shapes. The outer cladding 24 is a pure quartz glass material or a low refractive index coating of acrylic resin type.
Referring to fig. 3, a flow chart of a method for manufacturing a chiral coupling-core optical fiber according to the present application is shown, wherein the method for manufacturing the chiral coupling-core optical fiber includes the following steps.
Step S31: providing a central fiber core preform and two satellite fiber core preforms. Specifically, the central core preform is prepared by depositing the matrix material and the dopant material in a tube using MCVD (Modified Chemical vapor DepositiON) or PCVD (Plasma activated Chemical vapor DepositiON). And preparing a satellite fiber core preform by depositing a matrix material and a doping material in the PCVD tube.
Step S32: an inner cladding preform is provided. Specifically, the inner cladding preform is prepared by preparing a quartz substrate and a doping material thereof by adopting OVD (Outside Vapor Deposition) or VAD (Vapor Axial Deposition).
Step S33: and punching the inner cladding prefabricated rod according to the sizes of the central fiber core prefabricated rod and the two satellite fiber core prefabricated rods, wherein the number of the holes is three to accommodate the central fiber core prefabricated rod and the two satellite fiber core prefabricated rods.
Step S34: referring to fig. 4, the perforated inner cladding preform 41 is assembled with a central core preform 42 and two satellite core preforms 43, and is connected to an external pressure-controlled vacuum pump through a tail-end casing handle 44 and a special teflon airtight valve 45, and the two satellite core preforms 43 are symmetrically disposed around the central core preform 42. In one embodiment, the diameter of the hole on the central core preform 42 is larger than the diameter of the satellite core preform 43, and the difference between the two diameters is 0.2-0.5 mm.
Step S35: and carrying out high-speed rotating drawing on the assembled prefabricated rod to form the chiral coupling fiber core optical fiber of the double-satellite fiber core. In one embodiment, the high-speed spinning wire drawing temperature is 1700 to 1900 ℃, the wire drawing speed is 3 to 30m/min, the wire drawing tension is 0.5 to 2N, and the high-speed spinning speed is 0 to 1500 rpm.
Step S36: and the outer cladding is coated outside the inner cladding to protect the chiral coupling core optical fiber.
It will be understood by those skilled in the art that the above steps S31-S36 are not limited to the written order, and the steps may be performed in the same order or simultaneously, for example, step S32 may be before step S31 or simultaneously.
Example 1
In the chiral coupling core fiber 20 of the dual-satellite core 22 according to the present embodiment, the diameter of the central core 21 is 30 μm, the diameter of the satellite core 22 is 20 μm, the diameter of the inner cladding 23 is 250 μm, the diameter of the outer cladding 24 is 300 μm, the core gap between the central core 21 and the satellite core 22 is 25 μm, and the refractive indexes of the central core 21, the satellite core 22, the inner cladding 23, and the outer cladding 24 are 1.4590, 1.4595, 1.4572, and 1.3785, respectively. The pitch of the satellite core 22 is 5 mm.
The preparation process of the embodiment adopts MCVD or PCVD to deposit Yb, Al, Ge, Ce plasma and quartz substrate in the tube to prepare a central fiber core preform, adopts PCVD to deposit Fe, Cu, P, F plasma and quartz substrate in the tube to prepare a satellite fiber core preform, and adopts OVD to deposit Ge, F plasma and quartz substrate outside the tube to prepare an inner cladding preform. And (3) perforating the inner cladding preform according to the sizes of the central fiber core 21 and the satellite fiber core preform, sleeving the central fiber core 21 and the satellite fiber core preform into the hole of the inner cladding preform, and connecting the inner cladding preform with an external pressure control vacuum pump through a tail end sleeve handle and a specially-made Teflon airtight valve. And controlling the drawing temperature to be 1850 ℃, the drawing speed to be 5m/min, the drawing tension to be 2N and the high-speed rotation speed to be 1000 r/min, and finally drawing to obtain the required chiral coupling fiber core optical fiber 20 of the double-satellite fiber core 22.
Proved by verification, the chiral coupling fiber core optical fiber 20 provided by the embodiment has the skew efficiency of more than 65%, the beam quality is 1.10, and the output laser has better mode quality.
Example 2
In the chiral coupling core fiber 20 of the dual-satellite core 22 according to the present embodiment, the diameter of the central core 21 is 40 μm, the diameter of the satellite core 22 is 32 μm, the diameter of the inner cladding 23 is 450 μm, the diameter of the outer cladding 24 is 600 μm, the core gap between the central core 21 and the satellite core 22 is 35 μm, and the refractive indexes of the central core 21, the satellite core 22, the inner cladding 23, and the outer cladding 24 are 1.4620, 1.4605, 1.4572, and 1.3760, respectively. The pitch of the satellite core 22 is 10 mm.
The preparation process of the embodiment adopts MCVD or PCVD to deposit Nd, Al, Ge, P plasma and quartz substrate in the tube to prepare a central fiber core preform, adopts PCVD to deposit Cu, Ge, F plasma and quartz substrate in the tube to prepare a satellite fiber core preform, and adopts OVD to deposit P, F plasma and quartz substrate outside the tube to prepare an inner cladding preform. And (3) perforating the inner cladding preform according to the sizes of the central fiber core 21 and the satellite fiber core preform, sleeving the central fiber core 21 and the satellite fiber core preform into the hole of the inner cladding preform, and connecting the inner cladding preform with an external pressure control vacuum pump through a tail end sleeve handle and a specially-made Teflon airtight valve. And controlling the drawing temperature to 1750 ℃, the drawing speed to 10m/min, the drawing tension to 0.6N and the high-speed rotation speed to 1000 r/min, and finally drawing to obtain the required chiral coupling fiber core optical fiber 20 of the double-satellite fiber core 22.
Proved by verification, the chiral coupling fiber core optical fiber 20 provided by the embodiment has the slant efficiency of over 60 percent and the beam quality of 1.15, and shows that the output laser has better mode quality.
Example 3
In the chiral coupling core fiber 20 of the dual satellite core 22 according to the present embodiment, the diameter of the central core 21 is 40 μm, the diameter of the satellite core 22 is 32 μm, the diameter (3) of the inner cladding 23 is 450 μm, the diameter of the outer cladding 24 is 600 μm, the core gap between the central core 21 and the satellite core 22 is 35 μm, and the refractive indexes of the central core 21, the satellite core 22, the inner cladding 23, and the outer cladding 24 are 1.4605, 1.4613, 1.4575, and 1.3751, respectively. The pitch of the satellite core 22 is 2 mm.
The preparation process of the embodiment adopts MCVD or PCVD to deposit Tm, Al, Ge, P plasma and quartz substrate in a tube to prepare a central fiber core preform, adopts PCVD to deposit Fe, Ge, F plasma and quartz substrate in the tube to prepare a satellite fiber core preform, and adopts VAD to deposit F ion and quartz substrate outside the tube to prepare an inner cladding preform. And (3) perforating the inner cladding preform according to the sizes of the central fiber core 21 and the satellite fiber core preform, sleeving the central fiber core 21 and the satellite fiber core preform into the hole of the inner cladding preform, and connecting the inner cladding preform with an external pressure control vacuum pump through a tail end sleeve handle and a specially-made Teflon airtight valve. And controlling the drawing temperature to be 1800 ℃, the drawing speed to be 3m/min, the drawing tension to be 1.0N and the high-speed rotation speed to be 1500 r/min, and finally drawing to obtain the required chiral coupling fiber core optical fiber 20 of the double-satellite fiber core 22.
Proved by verification, the chiral coupling fiber core optical fiber 20 provided by the embodiment has the slant efficiency of more than 60 percent and the beam quality of 1.12, and shows that the output laser has better mode quality.
The chiral coupling fiber core fiber 20 and the preparation method thereof symmetrically arrange the two satellite fiber cores 22 around the central fiber core 21, ensure the symmetry and consistency of the two satellite fiber cores 22, improve the beam quality of the chiral coupling fiber core fiber 20, are applicable to active gain fibers with higher absorption and higher power, and can be applied to various short fiber and high-power fiber lasers.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.
Claims (10)
1. The chiral coupling fiber core optical fiber comprises a central fiber core, two satellite fiber cores and an inner cladding from inside to outside, and is characterized in that the number of the satellite fiber cores is two, and the two satellite fiber cores are symmetrically positioned between the central fiber core and the inner cladding.
2. The chirally coupled core optical fiber of claim 1, further comprising an outer cladding layer, said outer cladding layer being located outside said inner cladding layer.
3. The chiral coupled core fiber of claim 2, wherein the central core has a diameter of a0, the satellite core has a diameter of a1, the core separation between the central core and the satellite core is d and satisfies the relationship d < a0+ a1, the inner cladding has a diameter of b1, the outer cladding has a diameter of b2, the refractive indices of the central core, the satellite core, the inner cladding and the outer cladding are n1, n2, n3, n4, respectively, and satisfy the relationships n1 > n3 > n4 and n2 > n 3.
4. The chiral coupled core optical fiber of claim 2 wherein the outer cladding is a pure silica glass material or an acrylic low index coating.
5. The chiral coupled core fiber of claim 1, wherein the satellite core is a constant pitch rotating structure, the satellite core has a pitch of p, and 2mm < p < 10 mm.
6. The chiral coupled core fiber of claim 1, wherein the central core is a glass material doped with one or more of Tm, Nd, Yb, Al, Ge, Ce, P, F.
7. A method of making a chiral coupled-core optical fiber for making a chiral coupled-core optical fiber according to claims 1-6, comprising the steps of:
providing a central fiber core prefabricated rod and two satellite fiber core prefabricated rods;
providing an inner cladding preform;
punching the inner cladding preform according to the sizes of the central fiber core preform and the two satellite fiber core preforms, wherein the number of the holes is three to accommodate the central fiber core preform and the two satellite fiber core preforms;
assembling the perforated inner cladding prefabricated rod with a central fiber core prefabricated rod and two satellite fiber core prefabricated rods, and connecting the inner cladding prefabricated rods with an external pressure control vacuum pump through a tail end sleeve handle and a specially-made Teflon airtight valve, wherein the two satellite fiber core prefabricated rods are symmetrically arranged around the central fiber core;
and carrying out high-speed rotating drawing on the assembled prefabricated rod to form the chiral coupling fiber core optical fiber of the double-satellite fiber core.
8. The method of claim 7, wherein the central core preform is fabricated by depositing the host material and the dopant material in a MCVD or PCVD tube, and the satellite core preform is fabricated by depositing the host material and the dopant material in a PCVD tube.
9. The method of claim 7, wherein the diameter of the hole in the central core preform is greater than the diameter of the satellite core by a difference of 0.2 mm to 0.5 mm.
10. The method of claim 7, wherein the high speed spin drawing temperature is 1700-1900 ℃, the drawing speed is 3-30 m/min, the drawing tension is 0.5-2N, and the high speed spin speed is 0-1500 rpm.
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| CN114355505A (en) * | 2021-12-31 | 2022-04-15 | 长飞光纤光缆股份有限公司 | Laser shaping optical fiber, and preparation method and application thereof |
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