CN109613650B - Preparation method of ultraviolet adhesive optical fiber cone - Google Patents
Preparation method of ultraviolet adhesive optical fiber cone Download PDFInfo
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- CN109613650B CN109613650B CN201811476051.6A CN201811476051A CN109613650B CN 109613650 B CN109613650 B CN 109613650B CN 201811476051 A CN201811476051 A CN 201811476051A CN 109613650 B CN109613650 B CN 109613650B
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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
- G02B6/24—Coupling light guides
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
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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
- G02B6/24—Coupling light guides
- G02B6/25—Preparing the ends of light guides for coupling, e.g. cutting
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Abstract
The invention provides a preparation method of an ultraviolet adhesive optical fiber cone, which comprises the following steps: s1, selecting two same cylindrical bare fibers; s2, attaching ultraviolet glue on the flat end face of the bare optical fiber to enable the ultraviolet glue to form hemispherical liquid drops on the end face; s3, performing a pre-solidification operation on each hemispherical liquid drop for a first preset time to enable the hemispherical liquid drop to be basically positioned on the respective end surface; s4, arranging two hemispherical liquid drops of the two cylindrical bare fibers oppositely, and fusing the two precured hemispherical liquid drops after aligning and contacting; s5, moving each cylindrical bare fiber in the opposite direction of the fused hemispherical liquid drop so that the fused precured hemispherical liquid drop is stretched to form a conical structure; and S6, carrying out curing operation on the conical structure for a second preset time to obtain the solid ultraviolet glue optical fiber cone. The preparation method is simple, can be flexibly controlled, can be processed at normal temperature, and can realize low-cost and batch production of the polymer optical fiber taper.
Description
Technical Field
The invention relates to the field of polymer optical fiber taper preparation, in particular to a preparation method of an ultraviolet glue optical fiber taper.
Background
The optical fiber taper with low transmission loss, large evanescent field, small size, light weight and simple structure can realize the connection between common optical fibers and micro-nano optical fiber devices, can be used as optical devices such as power couplers, sensors, branching multiplexers, mode converters, optical tweezers and the like, and has been greatly concerned and researched since the invention of optical fibers.
The common methods for preparing the optical fiber cone mainly comprise a flame heating stretching method and CO2Laser heating stretching method, electric heating wire heating stretching method, arc heating stretching method, etching method, etc. The method can use flexible polymer as the material for manufacturing the optical fiber taper device.
Besides the conventional heating stretching method and chemical etching method, how to realize the preparation method of the polymer optical fiber taper with low polymer cost and mass production becomes a technical problem to be solved at present.
Disclosure of Invention
The invention provides a preparation method of an ultraviolet adhesive optical fiber cone, which has simple preparation process and flexible control and can be processed at normal temperature, and provides important basis for realizing low-cost and batch production of the polymer optical fiber cone.
In a first aspect, the present invention provides a method for preparing an ultraviolet glue optical fiber taper, comprising:
s1, selecting two same sections of cylindrical bare fibers, wherein each cylindrical bare fiber is provided with at least one flat end surface;
s2, attaching ultraviolet glue to the flat end face of each cylindrical bare optical fiber, so that the ultraviolet glue forms hemispherical liquid drops on the end face under the action of solid-liquid interfacial tension and liquid surface tension;
s3, performing a pre-solidification operation on each hemispherical liquid drop for a first preset time so that the hemispherical liquid drop is basically positioned on the respective end surface;
s4, fixing each cylindrical bare fiber on a support frame, and oppositely arranging two hemispherical liquid drops of the two cylindrical bare fibers to align the two precured hemispherical liquid drops, and fusing the two hemispherical liquid drops after the two hemispherical liquid drops are contacted;
s5, moving each cylindrical bare fiber in the opposite direction of the fused hemispherical liquid drop according to a preset speed, so that the fused pre-solidified hemispherical liquid drop is stretched and forms a conical structure with a conical transition region and a conical waist region;
and S6, carrying out curing operation on the conical structure for a second preset time to obtain the solid ultraviolet glue optical fiber cone.
Optionally, the step S1 includes:
s11, selecting two optical fibers;
s12, removing the coating layer of one end area of each optical fiber to obtain the optical fiber with the cylindrical bare fiber;
s13, the end face of each of the cylindrical bare fibers of each of the optical fibers is cut flat so that each of the cylindrical bare fibers has at least one flat end face.
Optionally, each optical fiber selected in the sub-step S11 has a length greater than 30 cm; and/or the optical fiber is a smooth cylindrical optical fiber;
and/or the presence of a gas in the gas,
the length of one end region of each optical fiber in the substep S12 is 3-5 cm;
and/or the presence of a gas in the gas,
in the substep S12, removing the coating layer in the end area by using wire strippers;
and/or the presence of a gas in the gas,
in the substep S13, an optical fiber cutter is used to cut the end surface of the cylindrical bare fiber of each optical fiber to be flat.
Optionally, the step S3 includes:
each hemispherical droplet is subjected to a pre-cure irradiation using a mercury lamp for a first predetermined time such that the hemispherical droplet is positioned substantially on the respective end face.
Optionally, the mercury lamp includes: a light curing lamp with 100W of output power and output wavelength of ultraviolet light wave band;
the first preset time is 10+ -3 s.
Optionally, the step S4 includes:
the support frame includes: a nanometer adjusting frame arranged on the electric translation table;
and/or the presence of a gas in the gas,
the support frame includes: a nanometer adjusting frame arranged on the electric translation table; the electric translation stage is a translation stage controlled by a computer.
Optionally, the step S6 includes:
and carrying out curing irradiation on the conical structure for a second preset time by adopting ultraviolet light.
Optionally, the wavelength of the ultraviolet light is 350nm-380 nm;
and/or the second preset time is 8-10 minutes.
Optionally, the ultraviolet glue is a photopolymer material with low optical attenuation and wide light transmission bandwidth, and the photopolymer material has the characteristics of short-time pre-curing adjustability and long-time curing high hardness.
Optionally, the step S2 includes: dripping ultraviolet glue on the flat end face by adopting a semi-conical optical fiber; the diameter of the cone waist of the semi-conical optical fiber is n micrometers, and n is a numerical value which is larger than 5 and smaller than 20;
and/or the presence of a gas in the gas,
the step S5 includes: the moving distance of each cylindrical bare fiber is controlled, and conical structures with different lengths of the conical transition region and diameters of the conical waist region are manufactured.
The invention has the following beneficial effects:
the method has simple preparation flow, can be flexibly controlled and processed at normal temperature, and further provides important basis for realizing low-cost and batch production of the polymer optical fiber taper.
Further, the invention utilizes the smooth and symmetrical cylindrical optical fiber as a supporting and controlling material for preparing the ultraviolet glue optical fiber cone. Ultraviolet glue with good transparency and small light attenuation is used as a cone material for preparing the ultraviolet glue optical fiber cone, and the characteristics of short-time irradiation precuring and long-time irradiation complete curing of the ultraviolet glue optical fiber cone are utilized, so that the ultraviolet glue is firstly attached to the end surface of a cylindrical bare optical fiber to form hemispherical liquid drops, then the hemispherical liquid drops are bound on the end surface of the optical fiber after short-time irradiation of a mercury lamp, the optical fiber cone containing a cone transition area and a cone waist area is formed through moving and stretching steps, and finally the ultraviolet light is used for long-time irradiation to form the solid ultraviolet glue optical fiber cone.
Drawings
FIG. 1 is a schematic flow chart of a method for manufacturing an ultraviolet adhesive optical fiber taper according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating a detailed process of manufacturing an ultraviolet adhesive optical fiber taper on a bare optical fiber with a coating layer removed according to the embodiment of FIG. 1;
FIG. 3 is a schematic structural diagram of the UV adhesive optical fiber taper manufactured in the embodiment shown in FIG. 1 in a front view direction;
FIG. 4 is a schematic view of the embodiment of FIG. 3 as seen from the right side;
FIG. 5 is a schematic structural diagram of a half-tapered UV adhesive optical fiber taper obtained by selecting a half of the embodiment shown in FIG. 3 in a front view direction;
FIG. 6 is a schematic diagram of the embodiment of FIG. 5 as viewed from the right side;
fig. 7 is a graph of signal light transmittance for the embodiment shown in fig. 1 and 2.
Reference numerals:
single mode optical fibers 1, 8;
an optical fiber 2 including a flat bare fiber end face;
a composite optical fiber 3 containing ultraviolet gel droplets 13;
a composite optical fiber 4 pre-cured with ultraviolet glue;
incompletely cured ultraviolet glue fiber cones 6, 18;
the completely cured ultraviolet glue optical fiber cones 7 and 20;
a coating layer 9, a bare fiber 10, a cladding layer 11 and a core layer 12;
a hemispherical ultraviolet glue drop 13;
an ultraviolet curing lamp 14, an electric translation stage 15 and a manual nanometer adjusting frame 16;
LWis the length of the waist region of the taper of the ultraviolet glue optical fiber DFDiameter of bare optical fiber for bonding ultraviolet glue and end face of optical fiber, DWThe diameter of the waist of the ultraviolet glue optical fiber cone.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
As shown in fig. 1, the brief preparation process of this example includes:
101. two single mode optical fibers 1 with the length of more than 30cm are cut.
102. And removing the coating layer of the intercepted single mode fiber end area to obtain the bare fiber of the end area, and cutting the end surface of the end area to be flat by using an optical fiber cutter to obtain the optical fiber 2 containing the flat bare fiber end surface.
The length of the tip region in this embodiment is about 3 to 5 cm.
103. Dripping ultraviolet glue on the flat end face of the bare optical fiber of the optical fiber 2 to obtain a composite optical fiber 3 containing ultraviolet glue droplets; the ultraviolet glue is attached to the whole end surface of the bare fiber to form hemispherical liquid drops under the action of solid-liquid interfacial tension and liquid surface tension.
In this embodiment, a half-tapered optical fiber with a taper waist of several micrometers to several tens of micrometers is used to attach the NOA 61 uv glue to the end face of the bare fiber. And a trace amount of ultraviolet glue liquid can be attached to the tail end of the semi-conical optical fiber and dripped onto the end face of the bare optical fiber.
For example, the uv glue may be a photopolymer material having low optical attenuation, wide light transmission bandwidth, adjustable after a mercury lamp is irradiated for a short time for precuring, and high hardness characteristics after ultraviolet light is irradiated for a long time, and may be a uv glue manufactured by Norland corporation.
For example, the cone material is a Norland Optical additive 61(NOA 61) ultraviolet glue with wide light transmission bandwidth, low light attenuation, low cost, stable performance and liquid state at normal temperature.
104. And carrying out short-time pre-curing irradiation by using a mercury lamp to obtain the ultraviolet glue pre-cured composite optical fiber 4, wherein after the pre-curing irradiation, the ultraviolet glue is basically positioned and bound on the end surface of the cylindrical bare optical fiber.
The mercury lamp in this embodiment may be a photo-curing lamp using 100W of output power and an output wavelength in the ultraviolet band, and its short irradiation time is about 10 s.
105. Two composite optical fibers 4 are fixed on two three-dimensional adjusting frames, and the three-dimensional adjusting frames are adjusted to enable two pre-cured ultraviolet glue drops attached to the end faces of the bare optical fibers to be aligned, contacted and fused together.
That is, the ultraviolet glue droplets on the two composite optical fibers 4 are aligned, contacted and fused to form the ultraviolet glue column 5.
The three-dimensional adjusting bracket in this embodiment is a manual nano-adjusting bracket 16 mounted on the electric translation stage 15. In addition, the electric translation stage belongs to a computer-controlled high-precision electric translation stage, and the moving speed and the moving distance can be accurately controlled.
106. And along the direction in which the two optical fibers are aligned, an electric translation table provided with a three-dimensional adjusting frame is arranged to move the optical fibers outwards at a certain speed and distance, so that the fused pre-cured ultraviolet glue is stretched and forms a conical structure.
In this step, the ultraviolet glue column 5 is moved and stretched to obtain the incompletely cured ultraviolet glue optical fiber taper 6. The ultraviolet light has output wavelength of 365nm and output light intensity of 900W/m2The ultraviolet glue optical fiber cones with different transition zone lengths and cone waist diameters are manufactured by controlling the moving distance and the stretching distance.
107. And (3) irradiating the ultraviolet light for a long time to obtain the completely cured ultraviolet glue optical fiber cone 7.
In this embodiment, the ultraviolet light has a wavelength of 350nm to 380 nm.
The long-time curing irradiation time is 8-10 minutes of ultraviolet irradiation.
Referring to fig. 2, the detailed preparation process of the embodiment of the invention is as follows:
firstly, intercepting two SMF-28 single-mode optical fibers 8 with the lengths of more than 30cm respectively;
secondly, cutting one end of each of the two optical fibers, removing a small section of coating layer with the length of about 3-5cm by using a wire stripper, and cutting the end face by using an optical fiber cutter to obtain two optical fibers comprising flat bare optical fiber end faces, wherein the two optical fibers comprise a coating layer 9, a bare optical fiber 10, a cladding layer 11 and a core layer 12;
thirdly, dripping NOA 61 ultraviolet glue on the end surface of the bare fiber 10 by using a semi-conical fiber with the conical waist diameter of several microns to dozens of microns, and attaching the NOA 61 ultraviolet glue on the end surface of the bare fiber under the action of the solid-liquid interface tension and the liquid surface tension to form a hemispherical ultraviolet glue liquid drop 13;
fourthly, performing short-time pre-curing irradiation on the hemispherical ultraviolet glue drops 13 for about 10 seconds by using a light curing lamp 14 with the output power of 100W and the output wavelength of ultraviolet waveband, so that the NOA 61 ultraviolet glue is basically positioned and bound on the bare fiber 10;
fifthly, fixing the optical fiber bound with the ultraviolet glue drops on two manual three-dimensional nanometer adjusting frames on the electric translation table, and adjusting the adjusting frames to enable the two hemispherical ultraviolet glue drops on the optical fiber to be aligned, contacted and fused together to form an ultraviolet glue column 17;
sixthly, arranging and controlling two three-dimensional adjusting frames on a computer to move outwards and stretch the ultraviolet glue column 17 at a certain speed and distance along the direction in which the two optical fibers are aligned to obtain an incompletely cured ultraviolet glue optical fiber cone 18;
the seventh step, using output wavelength 365nm and output light intensity 900W/m2And (3) irradiating the incompletely cured ultraviolet adhesive optical fiber taper 18 for 8-10 minutes for a long time by using the ultraviolet light 19 to obtain a final ultraviolet adhesive optical fiber taper 20.
FIGS. 3 to 6 are schematic structural diagrams of the UV glue optical fiber taper manufactured by the embodiments shown in FIGS. 1 and 2, respectively, wherein FIG. 3 is a schematic diagram of a full taper optical fiber in a front view direction, and a label LTMarking L for the length of the single-side transition region of the ultraviolet adhesive optical fiber coneWThe length of the waist region of the cone of the ultraviolet glue optical fiber. FIG. 4 is a schematic diagram of a right-view-direction fully tapered optical fiber, labeled DFIs the diameter of the bare fiber to which the uv glue and the fiber end face are bonded. FIG. 5 is a schematic view of a half-tapered optical fiber in the front view directionNote LTThe length of the single-side transition region of the ultraviolet adhesive optical fiber cone is marked with L as in FIG. 3WAnd/2 is half of the length of the conical waist region of the ultraviolet adhesive optical fiber. FIG. 6 is a schematic diagram of a right-view-direction half-tapered fiber, labeled DFThe diameter of the bare fiber to which the ultraviolet glue and the end face of the fiber are bonded is labeled D in the same manner as in FIG. 4WThe diameter of the waist of the ultraviolet glue optical fiber cone. By controlling the moving and stretching distance of the stepping motor, the ultraviolet adhesive optical fiber cones with different transition zone lengths, cone waist lengths, conicity and cone waist diameters can be prepared.
FIG. 7 shows the measurement of the transition zone length L using a broadband light source as the signal lightTLength L of waist area of 42 μm W15 μm bare fiber diameter DF125 μm and the diameter of the cone waist DWThe normalized transmittance curve graph of the NOA 61 ultraviolet glue optical fiber cone with the wavelength of 82 mu m is shown, and the scanning range of a spectrometer is 1485-1630 nm. In fig. 7, the abscissa represents the wavelength (nm) and the ordinate represents the normalized transmittance. As can be seen from fig. 7, the uv-gel optical fiber cone is well connected with the two supporting and controlling optical fibers on both sides, the signal of the broadband light source can be smoothly transmitted through the uv-gel optical fiber cone, and the outline shape of the signal spectrum is basically kept unchanged.
The above embodiments may be referred to each other, and the present embodiment does not limit the embodiments.
Finally, it should be noted that: the above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (11)
1. A preparation method of an ultraviolet glue optical fiber cone is characterized by comprising the following steps:
s1, selecting two same sections of cylindrical bare fibers, wherein each cylindrical bare fiber is provided with at least one flat end surface;
s2, attaching ultraviolet glue to the flat end face of each cylindrical bare optical fiber, so that the ultraviolet glue forms hemispherical liquid drops on the end face under the action of solid-liquid interfacial tension and liquid surface tension, wherein the ultraviolet glue is dropped on the flat end face by adopting a semi-conical optical fiber;
s3, performing a pre-solidification operation on each hemispherical liquid drop for a first preset time so that the hemispherical liquid drop is basically positioned on the respective end surface;
s4, fixing each cylindrical bare fiber on a support frame, and oppositely arranging two hemispherical liquid drops of the two cylindrical bare fibers to align the two precured hemispherical liquid drops, and fusing the two hemispherical liquid drops after the two hemispherical liquid drops are contacted;
s5, moving each cylindrical bare fiber in the opposite direction of the fused hemispherical liquid drop according to a preset speed, so that the fused pre-solidified hemispherical liquid drop is stretched and forms a conical structure with a conical transition region and a conical waist region;
and S6, carrying out curing operation on the conical structure for a second preset time to obtain the solid ultraviolet glue optical fiber cone.
2. The method according to claim 1, wherein the step S1 includes:
s11, selecting two optical fibers;
s12, removing the coating layer of one end area of each optical fiber to obtain the optical fiber with the cylindrical bare fiber;
s13, the end face of each of the cylindrical bare fibers of each of the optical fibers is cut flat so that each of the cylindrical bare fibers has at least one flat end face.
3. The method of claim 2,
the length of each optical fiber selected in the substep S11 is greater than 30 cm; and/or the optical fiber is a smooth cylindrical optical fiber;
and/or the presence of a gas in the gas,
the length of one end region of each optical fiber in the substep S12 is 3-5 cm;
and/or the presence of a gas in the gas,
in the substep S12, removing the coating layer in the end area by using wire strippers;
and/or the presence of a gas in the gas,
in the substep S13, an optical fiber cutter is used to cut the end surface of the cylindrical bare fiber of each optical fiber to be flat.
4. The method according to claim 1, wherein the step S3 includes:
each hemispherical droplet is subjected to a pre-cure irradiation using a mercury lamp for a first predetermined time such that the hemispherical droplet is positioned substantially on the respective end face.
5. The method of claim 4,
the mercury lamp includes: the ultraviolet curing lamp has 100W of output power and output wavelength of ultraviolet band;
the first preset time is 10 +/-3 s.
6. The method according to claim 1, wherein the step S4 includes:
the support frame includes: and the nanometer adjusting frame is arranged on the electric translation table.
7. The method of claim 6, wherein the motorized translation stage is a computer controlled translation stage.
8. The method according to claim 1, wherein the step S6 includes:
and carrying out curing irradiation on the conical structure for a second preset time by adopting ultraviolet light.
9. The method of claim 8,
the wavelength of the ultraviolet light is 350nm-380 nm;
and/or the second preset time is 8-10 minutes.
10. The method according to any one of claims 1 to 9,
the ultraviolet adhesive is a photopolymer material with low light attenuation and wide light transmission bandwidth, and the photopolymer material has the characteristics of short-time precuring adjustability and long-time curing high hardness.
11. The method according to any one of claims 1 to 9,
the step S2 includes: the diameter of the cone waist of the semi-conical optical fiber is n micrometers, and n is a numerical value which is larger than 5 and smaller than 20;
and/or the presence of a gas in the gas,
the step S5 includes: the moving distance of each cylindrical bare fiber is controlled, and conical structures with different lengths of the conical transition region and diameters of the conical waist region are manufactured.
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| CN114815008B (en) * | 2022-04-06 | 2023-10-20 | 深圳先进技术研究院 | Preparation method of micro-bottle lens with composite structure and micro-bottle lens with composite structure |
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