CN114895406A - Device and method for manufacturing lens on end face of optical fiber - Google Patents
Device and method for manufacturing lens on end face of optical fiber Download PDFInfo
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- CN114895406A CN114895406A CN202210623015.8A CN202210623015A CN114895406A CN 114895406 A CN114895406 A CN 114895406A CN 202210623015 A CN202210623015 A CN 202210623015A CN 114895406 A CN114895406 A CN 114895406A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0221—Testing optical properties by determining the optical axis or position of lenses
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Abstract
The invention relates to the technical field of optical fiber end face machining, in particular to a device and a method for manufacturing a lens on an optical fiber end face. The invention adopts a hot working melting mode of multi-time discharging on the end face of the optical fiber and a mode of monitoring the emergent facula state of the end of the optical fiber in real time, so that the curvature radius of the cylindrical surface of the wedge-shaped and inclined wedge-shaped lens optical fiber or the curvature radius of the spherical surface of the conical lens optical fiber is controllable, thereby improving the efficiency of manufacturing the lens on the end face of the optical fiber and improving the yield, the coupling efficiency and the consistency of the lens optical fiber.
Description
Technical Field
The invention relates to the technical field of optical fiber end face processing, in particular to a device and a method for manufacturing a lens on an optical fiber end face.
Background
The lens fiber belongs to one of optical passive devices, is used as a coupling tail fiber to be coupled with a pump laser, and is widely applied to the fields of fiber communication (such as EDFA), fiber sensing, fiber gyros and the like. Since the light emitting area of the semiconductor Laser (LD) is small, the waveguide structure is asymmetric, the far-field light spot is elliptical and has a large divergence angle, the optical coupling method in the early stage is to add an optical lens group between the semiconductor laser and the planar optical fiber to improve the coupling efficiency, and the coupling mode has a complicated structure, high coupling packaging difficulty and large cost control difficulty. The method widely applied at present is to directly process the end face of the optical fiber into a special lens shape to shape the laser beam, thereby improving the coupling efficiency.
The wedge-shaped and wedge-shaped lensed fibers are manufactured by performing mechanical processing such as grinding and polishing on the end of the lensed fiber to form a wedge angle with a required design, and then obtaining a cylindrical lens structure on the top of the wedge angle by using a melting method (hot working) or a polishing method (cold working), and similarly, a spherical structure can also be obtained on the top of the tapered lensed fiber.
In the prior art, a cold processing mode is adopted, namely a cylindrical lens or a spherical lens with a specific curvature radius is formed by polishing and chamfering the top of a wedge angle or the top of a cone angle after grinding and forming. The cold machining mode belongs to physical grinding, when a pointed structure at the tip end of an optical fiber rubs with a grinding medium, a bare fiber part can be bent to a certain degree and is easy to generate micro cracks, the bare fiber part has a fracture risk after being stressed during packaging, and the curved surface of a cold machined lens is rough, so that the coupling efficiency is influenced to a certain degree. Meanwhile, the processing mode has higher requirements on the precision degree of polishing and grinding equipment and the technical level of operators. Therefore, the device and the method for manufacturing the lens on the end face of the optical fiber are provided.
Disclosure of Invention
The invention aims to overcome the defects of a cold machining method for an optical fiber end face of a lens, and provides a device and a method for manufacturing the lens by using the optical fiber end face after grinding, so as to solve the problems of low production efficiency, poor geometric shape consistency, high machining difficulty and the like in the existing lens machining technology.
The invention provides the following technical scheme: the device for manufacturing the lens on the end face of the optical fiber comprises a discharging mechanism, an optical fiber clamping mechanism and an optical testing mechanism, wherein the discharging mechanism is used for discharging the end face of the optical fiber on the optical fiber clamping mechanism, the other end of the optical fiber is connected with a light source with a single wavelength, and the optical testing mechanism is used for monitoring the state of an emergent light spot at the end of the optical fiber in real time and further controlling the end face of the optical fiber to form the curvature radius of the curved surface of the lens.
Preferably, the discharge mechanism comprises a discharge control module body, an electrode bracket, a discharge electrode and a high-voltage cable, wherein the discharge electrode is fixed on the electrode bracket and is connected with the discharge control module body by using the high-voltage cable.
Preferably, the discharge mechanism performs discharge control using computer software.
Preferably, an optical fiber rotating clamp in the optical fiber clamping mechanism is fixed on the first three-dimensional adjusting frame, a clamp buckle is arranged at the tail end of the optical fiber rotating clamp, and the optical fiber supporting column is provided with a supporting clamping groove and an optical fiber limiting rod for fixing the optical fiber.
Preferably, the optical fiber clamping mechanism is fixed on the discharge control module body along the axial direction of the optical fiber, the optical fiber rotary clamp is provided with an optical fiber placing groove and 360-degree angle scales, and the clamp buckle is provided with a clamp clamping groove and a clamp cap and used for fixing the optical fiber.
Preferably, a beam quality analyzer in the optical testing mechanism is fixed on the second three-dimensional adjusting frame through a support rod, the beam quality analyzer is connected with the beam shrinking mirror, and a camera of a CCD in the optical testing mechanism is provided with a lens cone for observing the end face of the optical fiber.
Preferably, the lens cone and CCD camera assembly is fixed by a support, the placement position and the rotation state of the end face of the optical fiber can be monitored and positioned, and the discharge condition of the end face of the optical fiber can be monitored.
A method of making a lens on an end face of an optical fiber, comprising the steps of:
s1, cleaning the end face of the optical fiber after the end face is grinded into a wedge shape, an inclined wedge shape and a cone shape, fixing the optical fiber on an optical fiber clamping mechanism, and covering an optical fiber clamp buckle;
s2, adjusting a three-dimensional adjusting frame of the optical fiber clamping mechanism, placing the end face of the optical fiber on an electrode connecting line by referring to an image of a CCD camera in the optical testing mechanism, overlapping the lens ridges of the wedge-shaped and inclined wedge-shaped lenses with the electrode connecting line, and covering a limiting rod on an optical fiber supporting column;
s3, connecting the other end of the optical fiber with a light source, and observing two symmetrical light spot profiles on a software analysis interface of a light beam quality analyzer when the grinded wedge-shaped and wedge-shaped lens optical fiber is in light flux;
s4, setting parameters by using a computer, controlling a discharge mechanism to discharge for multiple times, observing that the original two symmetrical light spots are gradually converged together to form an elliptical light spot on a software analysis interface of a light beam quality analyzer, fitting the elliptical light spot into an ellipse by the outline at the full width at half maximum (FWHM) of the light spot intensity, and finding that the ellipticity value of the ellipse is gradually increased along with the increase of the discharge times until the ellipticity value reaches the range of the designed ellipticity value, namely, the discharge operation of the device can be stopped. Preferably, in the method for processing a lens by using a tapered optical fiber after grinding, after the steps of S1-S3 are executed, the size of a light spot profile can be seen to be gradually reduced on a software analysis interface of a beam quality analyzer, and when the ellipticity value and the major and minor axis radiuses of the fitted ellipse reach the design required range, the discharging operation of the device can be stopped;
s5, slowly adjusting the angle of the optical fiber rotating clamp to enable the optical fiber rotating clamp to rotate 360 degrees, measuring the track described by the central point of the light spot outline, analyzing the radius of the circular track to obtain the light-emitting off-axis degree of the processed curved lens, if the radius value is within the range of a set value, processing the curved surface of the optical fiber of the lens to be qualified, otherwise, processing the curved surface of the optical fiber of the lens to be unqualified.
The invention provides a device and a method for manufacturing a lens on an optical fiber end face, which adopt a hot working melting mode of multiple discharging on the optical fiber end face and a mode of monitoring the emergent light spot state of the optical fiber end in real time to control the curvature radius of a cylindrical surface of a wedge-shaped or wedge-shaped lens optical fiber or the curvature radius of a spherical surface of a conical lens optical fiber, thereby improving the efficiency of manufacturing the lens on the optical fiber end face and improving the yield, the coupling efficiency and the consistency of the lens optical fiber.
Drawings
FIG. 1 is a schematic top view of the apparatus of the present invention;
FIG. 2 is a schematic side view of the apparatus of the present invention;
fig. 3 is a perspective view of the device of the present invention.
In the figure: 1. a discharge mechanism; 11. a discharge control module body; 12. an electrode holder; 13. a discharge electrode; 14. a high voltage cable; 2. an optical fiber clamping mechanism; 21. a first three-dimensional adjusting frame; 22. an optical fiber rotating clamp; 23. a clamp slot; 24. clamping a clamp; 25. an optical fiber support column; 26. a support slot; 27. an optical fiber limiting rod; 3. an optical testing mechanism; 31. a beam shrinking mirror; 32. a beam quality analyzer; 33. a second three-dimensional adjusting frame; 34. a support bar; 35. a lens barrel; 36. a CCD camera.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
As shown in fig. 1 and 2, the present invention provides a technical solution: a device for manufacturing a lens on the end face of an optical fiber comprises a discharge mechanism 1, an optical fiber clamping mechanism 2 and an optical testing mechanism 3.
The discharging mechanism 1 comprises a discharging control module body 11, an electrode bracket 12, a discharging electrode 13 and a high-voltage cable 14, wherein the discharging electrode 13 is fixed on the electrode bracket 12 and is connected with the discharging control module body 11 by using the high-voltage cable 14; the discharging mechanism 1 uses the existing computer software to control discharging, and can prevent the vibration caused in the key operation process of the traditional mechanism.
An optical fiber rotating clamp 22 in the optical fiber clamping mechanism 2 is fixed on a three-dimensional adjusting frame I21, the tail end of the optical fiber rotating clamp 22 is provided with a clamp buckle 24, and an optical fiber support column 25 is provided with a support clamping groove 26 and an optical fiber limiting rod 27 for fixing optical fibers; the optical fiber clamping mechanism 2 is fixed on the discharge control module body 11 along the optical fiber axis direction, the optical fiber rotary clamp 22 is provided with an optical fiber placing groove and 360-degree angle scales, and the clamp buckle 24 is provided with a clamp clamping groove 23 and a clamping cap and used for fixing the optical fiber.
The light beam quality analyzer 32 in the optical testing mechanism 3 is fixed on the second three-dimensional adjusting frame 33 through a supporting rod 34, the light beam quality analyzer 32 is connected with the beam reducing mirror 31, and the camera 36 of the CCD in the optical testing mechanism 3 is provided with a lens barrel 35 for observing the end face of the optical fiber. The working principle of the beam quality analyzer 32 in the optical testing mechanism 3 is a camera type, and the center of a sensor and the central axis of the beam shrinking mirror 31 are on the extension line of the optical fiber axis; the lens cone 35 and CCD camera 36 assembly is fixed by a support, the placement position and the rotation state of the end face of the optical fiber can be monitored and positioned, and meanwhile, the discharge condition of the end face of the optical fiber is monitored. A beam quality analyzer is an analytical instrument used in the field of physics. The demonstration of the collected light beam images comprises the following steps: the method comprises the steps of measuring the beam center position, the beam peak intensity position, the beam divergence, the ellipticity, the beam intensity uniformity, Gaussian fitting, forming different beam diameters/widths based on the peak value/total energy percentage selected by a user and the like, wherein the software is the existing self-contained software.
The invention also provides a method for manufacturing the lens on the end face of the optical fiber, and the device for manufacturing the lens on the end face of the optical fiber is adopted, and the manufacturing method adopts a hot processing melting mode of discharging for many times on the end face of the optical fiber and a mode of monitoring the emergent light spot state of the end of the optical fiber in real time, so that the curvature radius of the cylindrical surface of the wedge-shaped and wedge-shaped lens optical fiber or the curvature radius of the spherical surface of the conical lens optical fiber is controllable, the efficiency of manufacturing the lens on the end face of the optical fiber is improved, and the yield, the coupling efficiency and the consistency of the lens optical fiber are improved. The method comprises the following steps:
s1, cleaning the end face of the optical fiber after the end face is grinded into a wedge shape, an inclined wedge shape and a cone shape, fixing the optical fiber on the optical fiber clamping mechanism 2, and covering the optical fiber clamp buckle 24;
s2, adjusting a first three-dimensional adjusting frame 21 of the optical fiber clamping mechanism 2, placing the end face of the optical fiber on an electrode connecting line by referring to an image of a CCD camera 36 in the optical testing mechanism 3, overlapping the lens ridges of the wedge-shaped and inclined wedge-shaped lenses with the electrode connecting line, and covering a limiting rod on the optical fiber supporting column 25;
s3, connecting the other end of the optical fiber with a 980nm light source, and observing two symmetrical light spot profiles on a software analysis interface of the light beam quality analyzer 32 when the grinded wedge-shaped and wedge-shaped lens optical fibers are in light conduction;
s4, setting appropriate parameters by using a PC, controlling the discharge mechanism 1 to discharge for multiple times, observing that the original two symmetrical light spots are gradually converged together to form an elliptical light spot on a software analysis interface of the light beam quality analyzer 32, fitting the outline at the FWHM of the light spot intensity to form an ellipse, finding that the ellipticity value of the ellipse is gradually increased along with the increase of the discharge times until the ellipticity value reaches the range of the designed ellipticity value, and stopping the discharge operation of the device. It should be added that, for the tapered fiber processing lens after grinding, after the steps S1-S3 are completed, the size of the spot profile can be seen to be gradually reduced on the software analysis interface of the beam quality analyzer 32, and when the ellipticity value and the major and minor axis radii of the ellipse reach the design requirement range, the discharging operation of the device can be stopped.
S5, slowly adjusting the angle of the optical fiber rotating clamp 22 to rotate 360 degrees, measuring the track described by the central point of the light spot outline, analyzing the radius of the circular track to obtain the light-emitting off-axis degree of the processed curved lens, if the radius value is within the range of the set value, processing the curved surface of the optical fiber of the lens to be qualified, otherwise, processing the curved surface of the optical fiber of the lens to be unqualified.
It should be added that the scheme can indirectly measure the divergence half angle of the fast and slow axes of the wedge-shaped and wedge-shaped lens optical fiber, and the specific principle can be explained as that the slow axis light-emitting surface of the wedge-shaped and wedge-shaped lens optical fiber is a plane wave front, the plane wave front is perpendicular to the axial direction of the optical fiber or forms a certain inclined included angle with the axial direction of the optical fiber, so that the slow axis divergence half angle is a specific value in the processing process of the lens optical fiber, the ellipticity value of the light spot is the ratio of the slow axis divergence half angle to the fast axis divergence half angle of the light spot at the far field position, the ellipticity value of the light spot is measured by the light beam quality analyzer 32, the parameters of the fast axis divergence half angle of the light spot can be obtained, when the end face of the optical fiber is subjected to discharge melting, the fast axis divergence half angle of the emergent light beam of the lens can be changed, and the size of the divergence half angle can be controlled by controlling the size of the emergent light beam of the tapered lens optical fiber on the light beam quality analyzer 32.
The invention provides a device and a method for manufacturing a lens on an optical fiber end face, which adjust the relative position between the optical fiber end face and an electrode of a discharge mechanism 1 by operating an optical fiber clamping mechanism 2, connect a light source with a single wavelength at the other end of the optical fiber, then set a proper discharge parameter on control software of the discharge mechanism 1 and carry out discharge for a plurality of times, so that a tip part of the optical fiber end face which is ground into a wedge shape, an oblique wedge shape or a cone shape is gradually fused into a cylindrical surface or a spherical surface, the process can measure parameters such as an ellipse value or a light spot outline size of a light spot emitted from the optical fiber lens in real time through software of a light beam quality analyzer 32 to indirectly feed back the size of the cylindrical surface curvature radius or the spherical surface curvature radius of the lens fused on the optical fiber end face until the qualified optical fiber lens is produced, the discharge can be stopped, and an operator only needs to finish clamping, discharging, The position adjustment, the discharge melting and the optical parameter measurement can produce the qualified lens optical fiber, the whole operation process is convenient, the operation is easy, the production efficiency can be greatly improved, the production cost can be reduced, meanwhile, the optical parameter of the lens optical fiber can be accurately controlled, the consistency of the discharge melting size of the lens is improved, and the coupling efficiency of the lens is improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (9)
1. An apparatus for manufacturing a lens on an end face of an optical fiber, comprising: the optical fiber end surface discharge device comprises a discharge mechanism (1), an optical fiber clamping mechanism (2) and an optical testing mechanism (3), wherein the discharge mechanism (1) is used for discharging an optical fiber end surface on the optical fiber clamping mechanism (2), the other end of the optical fiber is connected with a light source with a single wavelength, and the optical testing mechanism (3) is used for monitoring the state of an emergent light spot of the optical fiber end in real time and further controlling the optical fiber end surface to form the curvature radius of a lens curved surface.
2. An apparatus for forming a lens on an end face of an optical fiber according to claim 1, wherein: the discharging mechanism (1) comprises a discharging control module body (11), an electrode support (12), a discharging electrode (13) and a high-voltage cable (14), wherein the discharging electrode (13) is fixed on the electrode support (12) and is connected with the discharging control module body (11) through the high-voltage cable (14).
3. An apparatus for forming a lens on an end face of an optical fiber according to claim 1, wherein: the discharge mechanism (1) performs discharge control using computer software.
4. An apparatus for forming a lens on an end face of an optical fiber according to claim 1, wherein: an optical fiber rotating clamp (22) in the optical fiber clamping mechanism (2) is fixed on a first three-dimensional adjusting frame (21), a clamp buckle (24) is arranged at the tail end of the optical fiber rotating clamp (22), and an optical fiber supporting column (25) is provided with a supporting clamping groove (26) and an optical fiber limiting rod (27) for fixing an optical fiber.
5. The apparatus for forming a lens on an end face of an optical fiber according to claim 4, wherein: the optical fiber clamping mechanism (2) is fixed on the discharge control module body (11) along the axial direction of the optical fiber, the optical fiber rotary clamp (22) is provided with an optical fiber placing groove and 360-degree angle scales, and the clamp buckle (24) is provided with a clamp clamping groove (23) and a clamping cap and used for fixing the optical fiber.
6. An apparatus for forming a lens on an end face of an optical fiber according to claim 1, wherein: and a light beam quality analyzer (32) in the optical testing mechanism (3) is fixed on a second three-dimensional adjusting frame (33) through a support rod (34), the light beam quality analyzer (32) is connected with a beam reducing mirror (31), and a camera (36) of a CCD in the optical testing mechanism (3) is provided with a lens barrel (35) for observing the end face of an optical fiber.
7. The apparatus of claim 6, wherein: the lens cone (35) and CCD camera (36) combination body is fixed by a support, the placement position and the rotation state of the end face of the optical fiber can be monitored and positioned, and meanwhile the discharge condition of the end face of the optical fiber is monitored.
8. A method for manufacturing a lens on an end face of an optical fiber is characterized in that: the method comprises the following steps:
s1, cleaning the end face of the optical fiber after the end face is grinded into a wedge shape, an inclined wedge shape and a cone shape, fixing the optical fiber on the optical fiber clamping mechanism (2), and covering the optical fiber clamp buckle (24);
s2, adjusting a three-dimensional adjusting frame I (21) of the optical fiber clamping mechanism (2), placing the end face of the optical fiber on an electrode connecting line by referring to an image of a CCD camera (36) in the optical testing mechanism (3), overlapping the lens ridges of the wedge-shaped and inclined wedge-shaped lenses with the electrode connecting line, and covering a limiting rod on an optical fiber supporting column (25);
s3, connecting the other end of the optical fiber with a light source, and observing two symmetrical light spot profiles on a software analysis interface of a light beam quality analyzer (32) when the grinded wedge-shaped and wedge-shaped lens optical fiber is in light flux;
s4, setting parameters by using a computer, controlling the discharge mechanism (1) to discharge for multiple times, observing that the original two symmetrical light spots are gradually converged together and become an elliptical light spot on a software analysis interface of the light beam quality analyzer (32), fitting the outline of the half-height width of the light spot intensity into an ellipse, finding that the ellipticity value of the ellipse is gradually increased along with the increase of the discharge times until the ellipticity value reaches the range of the ellipticity value required by design, and stopping the discharge operation of the device;
s5, slowly adjusting the angle of the optical fiber rotating clamp (22) to rotate the optical fiber rotating clamp for 360 degrees, measuring the track described by the central point of the light spot outline, analyzing the radius of the circular track to obtain the light-emitting off-axis degree of the processed curved lens, if the radius value is within the range of a set value, processing the curved surface of the optical fiber of the lens to be qualified, otherwise, processing the curved surface of the optical fiber of the lens to be unqualified.
9. A method of making a lens on an end face of an optical fiber according to claim 8, wherein: in step S4, after the steps S1-S3 are performed on the polished tapered fiber processing lens, the size of the spot profile is gradually reduced on the software analysis interface of the beam quality analyzer (32), the profile at the full width at half maximum of the spot intensity is fitted into an ellipse, when the ellipticity value and the radius of the major and minor axes of the ellipse reach the design requirement range, the discharging operation of the apparatus is stopped, and then step S5 is performed to determine whether the tapered lens fiber is acceptable.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210623015.8A CN114895406A (en) | 2022-06-01 | 2022-06-01 | Device and method for manufacturing lens on end face of optical fiber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210623015.8A CN114895406A (en) | 2022-06-01 | 2022-06-01 | Device and method for manufacturing lens on end face of optical fiber |
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| CN114895406A true CN114895406A (en) | 2022-08-12 |
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| CN202210623015.8A Pending CN114895406A (en) | 2022-06-01 | 2022-06-01 | Device and method for manufacturing lens on end face of optical fiber |
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- 2022-06-01 CN CN202210623015.8A patent/CN114895406A/en active Pending
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