CN210488036U - Optical fiber axis fixing device for photonic crystal fiber connection - Google Patents
Optical fiber axis fixing device for photonic crystal fiber connection Download PDFInfo
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- CN210488036U CN210488036U CN201921140903.4U CN201921140903U CN210488036U CN 210488036 U CN210488036 U CN 210488036U CN 201921140903 U CN201921140903 U CN 201921140903U CN 210488036 U CN210488036 U CN 210488036U
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Abstract
An apparatus for fiber alignment in photonic crystal fiber connections, comprising: the device comprises an optical fiber fixing seat, a cover plate, an optical fiber positioning device, a fixed shaft device and an observation system; the section of the fixed shaft device is Z-shaped, the optical fiber fixing seat is assembled on the upper surface of the fixed shaft device, a fixture V-shaped groove is formed in the optical fiber fixing seat, the photonic crystal optical fiber extending out of the optical fiber positioning device is placed in the fixture V-shaped groove, the photonic crystal optical fiber is tightly pressed in the fixture V-shaped groove through the cover plate, the length of the photonic crystal optical fiber extending out of the fixture V-shaped groove is adjusted through the observation system, and the optical fiber head extending out of the fixture V-shaped groove is located in the center of the view field of the observation system. The utility model discloses a device can realize photonic crystal fiber's twice dead axle, the simple operation to photonic crystal fiber connection's reliability has been improved.
Description
Technical Field
The utility model belongs to the optoelectronic device field, more specifically say a device that is arranged in optic fibre dead axle of photonic crystal optic fibre to connect.
Background
The common polarization maintaining fiber is greatly influenced by the environment, so that the application range of the common fiber-optic gyroscope is greatly limited by factors such as temperature, magnetic field, space radiation and the like. The photonic crystal fiber is a microstructure fiber made of a single material, has the characteristics of very low bending loss, ultra-wide single-mode transmission, low dispersion and high birefringence, and is very suitable for developing a high-performance fiber-optic gyroscope. In practical use, the end face configuration of the photonic crystal fiber has holes, so that the connection between the fiber and other optical elements in an optical path is very difficult, the reliability of the optical path is very poor, and the photonic crystal fiber can only be used in a laboratory state.
SUMMERY OF THE UTILITY MODEL
The utility model solves the technical problem that in the method of connecting by photonic crystal fiber, the defect that the air hole of the optical fiber is easily blocked by the traditional optical fiber grinding and polishing method is overcome, a novel photonic crystal fiber dead axle device is provided, the optical fiber with α degrees is directly cut by the device, the air hole of the photonic crystal fiber is prevented from being blocked without grinding and polishing, and the connection precision of the optical path of the optical fiber is improved.
The technical proposal of the utility model for solving the technical problem is that:
an apparatus for fiber alignment in photonic crystal fiber connections, comprising: the device comprises an optical fiber fixing seat (1), a cover plate (2), an optical fiber positioning device (3), a dead axle device (4) and an observation system (5);
the section of the fixed shaft device (4) is Z-shaped, the optical fiber fixing seat (1) is assembled on the upper surface of the fixed shaft device (4), a fixture V-shaped groove is formed in the optical fiber fixing seat (1), the photonic crystal optical fiber extending out of the optical fiber positioning device (3) is placed in the fixture V-shaped groove, the photonic crystal optical fiber is compressed in the fixture V-shaped groove through the cover plate (2), the length of the photonic crystal optical fiber extending out of the fixture V-shaped groove is adjusted through the observation system (5), and the optical fiber head extending out of the fixture V-shaped groove is located in the center of the view field of the observation system (5).
Further, the observation system (5) comprises a microscope, a CCD system and a display; the end face of the optical fiber head extending out of the V-shaped groove of the fixture is positioned in the center of a view field of the microscope, and the CCD system images the end face of the optical fiber head through the microscope and displays the image through the display.
Further, the coating layer of the photonic crystal fiber is stripped by an optical fiber thermal puller for extending the optical fiber head of the optical fiber clamp, the optical fiber head of the bare fiber is vertically cut by an optical fiber cutting knife, the end face of the bare fiber is flat, and the first-time axis fixing of the photonic crystal fiber is carried out.
Further, the dead axle of the first-time photonic crystal fiber specifically comprises: and enabling the polarization maintaining axis of the photonic crystal fiber to be vertical to the upper surface of the V-shaped groove of the fixture, and then fixing the fiber.
Furthermore, the width of the V-shaped groove of the clamp is 158-162 micrometers, and the depth of the V-shaped groove of the clamp is 68-76 micrometers.
Furthermore, after the first-time fixing of the photonic crystal fiber is carried out, the optical fiber head extending out of the V-shaped groove of the fixture is placed on the optical fiber cutting knife, the optical fiber head is fixed through the first fixing device and the second fixing device, and the knife head of the optical fiber cutting knife is positioned between the first fixing device and the second fixing device and used for cutting the photonic crystal fiber between the first fixing device and the second fixing device.
Furthermore, after the photonic crystal fiber is fixed, the second fixing device is rotated by 90 degrees, the photonic crystal fiber between the first fixing device and the second fixing device is twisted by 90 degrees, and after the cutter head cuts the photonic crystal fiber, the photonic crystal fiber forms an end face angle of a 15-degree inclined plane.
The wafer is provided with etched wafer V-shaped grooves, the wafer is cut into a plurality of arrays, the arrays are cut into a plurality of discrete units, each discrete unit is provided with one and only one wafer V-shaped groove, and the cutting direction is parallel to the wafer V-shaped grooves on the arrays.
Furthermore, the depth of the etched V-shaped grooves of the wafer is 45-52 μm, the width of the etched V-shaped grooves of the wafer is 95-105 μm, and the distance between the adjacent V-shaped grooves of the wafer is 1.3-1.6 mm; when the wafer is cut into the array, the wafer is cut in the direction perpendicular to the V-shaped groove of the wafer, and the length of the V-shaped groove of the wafer in each array obtained by cutting is the same and is 1.9 mm-2.2 mm.
Furthermore, the end face of the wafer dicing array is ground into an inclined plane, the length of the array is 1.8-2 mm, and the inclination angle of the end face is 15 degrees +/-0.5 degrees.
The utility model has the advantages that:
compare in traditional photonic crystal fiber connection, the optic fibre angle can only be realized through grinding the throwing technology, and the air hole of optic fibre is easily at the mill in-process of throwing by the granule jam, causes optic fibre optical loss great, with chip coupling loss defect such as big, the utility model is used for the dead axle device of optic fibre among the photonic crystal fiber connection, through twice dead axle, the dead axle orientation of keeping of photonic crystal optic fibre is guaranteed to the dead axle for the first time, and in cutting process, the tool bit drives the rotatory specific angle of optic fibre, can guarantee that the incision of optic fibre is parallel with fast axle, and the dead axle guarantees for the second time that the tail optic fibre is parallel with the inclined plane in V type groove, and optic fibre does not stretch out fixture V type groove edge. By using the device, the connection between the optical fiber and the V-shaped groove of the fixture can be realized without introducing a grinding and polishing process, the operation is convenient, and the reliability of the connection of the photonic crystal optical fiber is improved.
Drawings
FIG. 1 is a schematic view of a first axle fixing device of the present invention;
FIG. 2 is a schematic view of the dead axle device of the present invention;
FIG. 3 is a schematic view of the second dead axle of the present invention;
FIG. 4 is a schematic diagram of the fiber and chip connection.
Detailed Description
The utility model discloses research photonic crystal fiber high reliability low-loss connection technology can fundamentally break through the bottleneck that hinders photonic crystal fiber gyroscope engineering production among the photonic crystal fiber connection technology, the technical problem that need solve is that the β angle with photonic crystal fiber end face according to specific axial (fast axle or slow axle) processing into α angle and Y waveguide chip terminal surface matches, as shown in FIG. 4:
according to the law of refraction, n1 sin α n2 sin β requires accurate axial determination and smooth and flat end surface, so that the optical fiber after end surface treatment and the waveguide pattern on the chip can be accurately aligned in submicron order.
The end face of the photonic crystal fiber is of a porous structure, so that holes are easy to collapse in the end face treatment process, the structure of the fiber is damaged, the optical transmission loss is influenced, and the cavity of the fiber is easy to be blocked by tiny particles, so that the shape of a mode field is changed, and the polarization maintaining performance is reduced. Most of the prior art adopts polishing process to ensure the control of the end face angle of the optical fiber, but because the cladding of the photonic crystal fiber has micron-sized air holes, the air holes are blocked by particles during polishing, so that the optical loss is large.
As shown in fig. 1, the present invention provides a device for optical fiber dead axle in photonic crystal fiber connection, which includes:
the device comprises an optical fiber fixing seat 1, a cover plate 2, an optical fiber positioning device 3, a fixed shaft device 4 and an observation system 5;
as shown in fig. 2, the section of the fixed shaft device 4 is zigzag, the optical fiber fixing seat 1 is assembled on the upper surface of the fixed shaft device 4, a fixture V-shaped groove is arranged on the optical fiber fixing seat 1, the photonic crystal fiber extending from the optical fiber positioning device 3 is placed in the fixture V-shaped groove, the photonic crystal fiber is tightly pressed in the fixture V-shaped groove through the cover plate 2, the length of the photonic crystal fiber extending out of the fixture V-shaped groove is adjusted through the observation system 5, and the end face of the optical fiber extending out of the fixture V-shaped groove is positioned in the center of the view field of the observation system 5.
The observation system 5 comprises a microscope, a CCD system and a display; the end face of the optical fiber head extending out of the V-shaped groove of the fixture is positioned in the center of a view field of the microscope, and the CCD system images the end face of the optical fiber head through the microscope and displays the image through the display.
The coating layer 15-20 mm of the photonic crystal fiber extending out of the fiber head of the fiber clamp is stripped by using a fiber thermal puller, the bare fiber is vertically cut by using a fiber cutter for 9-15 mm, the end face of the bare fiber is smooth, and the primary axis of the photonic crystal fiber is fixed.
The fixed axis of the primary photonic crystal fiber specifically comprises: and rotating the photonic crystal fiber to enable the polarization maintaining axis of the photonic crystal fiber to be vertical to the upper surface of the V-shaped groove of the fixture, and then fixing the fiber. The first axis fixing is to determine the polarization maintaining axial direction of the photonic crystal fiber, so that the end face of the photonic crystal fiber is conveniently cut into a specific angle.
The width of the V-shaped groove of the fixture is 158-162 mu m, and the depth of the V-shaped groove of the fixture is 68-76 mu m.
After the first-time fixing of the photonic crystal fiber, the optical fiber head extending out of the V-shaped groove of the fixture is placed on the optical fiber cutting knife, the optical fiber head is fixed through the first fixing device and the second fixing device, and the knife head of the optical fiber cutting knife is located between the first fixing device and the second fixing device and used for cutting the photonic crystal fiber between the first fixing device and the second fixing device. As shown in fig. 3.
After the photonic crystal fiber is fixed, the second fixing device is rotated by 90 degrees, the photonic crystal fiber between the first fixing device and the second fixing device is twisted by 90 degrees, and after the cutter head cuts the photonic crystal fiber, the photonic crystal fiber forms an end face angle of a 15-degree inclined plane.
Further, the utility model provides a dead axle device still includes the wafer, has the wafer V type groove of corroding out on this wafer, and this wafer is drawn and is cut into a plurality of arrays, the array is cut into a plurality of discrete units, has and only has a wafer V type groove on every discrete unit, and the cutting direction is on a parallel with the wafer V type groove on the array.
The depth of the etched wafer V-shaped groove is 45-52 mu m, the width is 95-105 mu m, and the distance between the adjacent wafer V-shaped grooves is 1.3-1.6 mm; when the wafer is cut into the array, the wafer is cut in the direction perpendicular to the V-shaped groove of the wafer, and the length of the V-shaped groove of the wafer in each array obtained by cutting is the same and is 1.9 mm-2.2 mm. The end face of the wafer cutting array is ground into an inclined plane, the length of the array is 1.8-2 mm, and the inclination angle of the end face is 15 +/-0.5 degrees.
Compare in traditional photonic crystal fiber connection, the optic fibre angle can only be realized through grinding the throwing technology, and the air hole of optic fibre is easily at the mill in-process of throwing by the granule jam, causes optic fibre optical loss great, with chip coupling loss defect such as big, the utility model is used for the dead axle device of optic fibre among the photonic crystal fiber connection, through twice dead axle, the dead axle orientation of keeping of photonic crystal optic fibre is guaranteed to the dead axle for the first time, and in cutting process, the tool bit drives the rotatory specific angle of optic fibre, can guarantee that the incision of optic fibre is parallel with fast axle, and the dead axle guarantees for the second time that the tail optic fibre is parallel with the inclined plane in V type groove, and optic fibre does not stretch out fixture V type groove edge. By using the device, the connection between the optical fiber and the V-shaped groove of the fixture can be realized without introducing a grinding and polishing process, the operation is convenient, and the reliability of the connection of the photonic crystal optical fiber is improved.
The utility model provides an embodiment as follows:
and carrying out PCFs tail fiber assembly preparation and performance test through twice shaft fixing. Firstly, fixing the photonic crystal fiber on a V-shaped groove of a fixture, rotating the photonic crystal fiber to a specific polarization maintaining axis, and tightly pressing the photonic crystal fiber by a pressing cover to complete primary axis fixing; then putting the photonic crystal fiber on a cutter, and cutting out a 15-degree fiber inclination angle; and finally, putting the photonic crystal fiber into the V-shaped groove of the wafer, and adjusting the polarization maintaining axis direction of the photonic crystal fiber and the length of the photonic crystal fiber extending out of the V-shaped groove of the wafer to complete second axis fixing.
The fiber angle was measured under a measuring microscope, and the results were as follows:
TABLE 1 light angle measuring instrument
As can be seen from the measuring table, the light angle error cut by the method is less than or equal to 0.95 DEG
The insertion loss of the tail fiber can be calculated to be 0.21dB, the insertion loss of the tail fiber obtained by using the grinding and polishing method is 0.3-0.5 dB, and the method of the utility model is superior to the traditional grinding and polishing method.
Claims (10)
1. A device for optical fiber dead axle in photonic crystal fiber connection is characterized in that: the method comprises the following steps: the device comprises an optical fiber fixing seat (1), a cover plate (2), an optical fiber positioning device (3), a fixed shaft device (4) and an observation system (5) for adjusting the length of the photonic crystal optical fiber extending out of a V-shaped groove of the clamp;
the section of the fixed shaft device (4) is Z-shaped, the optical fiber fixing seat (1) is assembled on the upper surface of the fixed shaft device (4), a fixture V-shaped groove is formed in the optical fiber fixing seat (1), the photonic crystal optical fiber extending out of the optical fiber positioning device (3) is placed in the fixture V-shaped groove, the photonic crystal optical fiber is pressed in the fixture V-shaped groove through the cover plate (2), and the optical fiber head extending out of the fixture V-shaped groove is located in the center of a view field of the observation system (5).
2. The apparatus of claim 1, wherein the optical fiber is fixed in axis in photonic crystal fiber connection, and the apparatus comprises: the observation system (5) comprises a microscope, a CCD system and a display; the end face of the optical fiber head extending out of the V-shaped groove of the fixture is positioned in the center of a view field of the microscope, and the CCD system images the end face of the optical fiber head through the microscope and displays the image through the display.
3. The apparatus of claim 1, wherein the optical fiber is fixed in axis in photonic crystal fiber connection, and the apparatus comprises: the coating layer is stripped by an optical fiber thermal puller, and the optical fiber head of the bare fiber is vertically cut by an optical fiber cutter, so that the end face of the optical fiber is smooth.
4. The apparatus of claim 1, wherein the optical fiber is fixed in axis in photonic crystal fiber connection, and the apparatus comprises: and the primary photonic crystal fiber is fixed, and the polarization maintaining axis of the photonic crystal fiber is vertical to the upper surface of the V-shaped groove of the fixture.
5. The apparatus of claim 1, wherein the optical fiber is fixed in axis in photonic crystal fiber connection, and the apparatus comprises: the width of the V-shaped groove of the fixture is 158-162 mu m, and the depth of the V-shaped groove of the fixture is 68-76 mu m.
6. The apparatus of claim 4, wherein the optical fiber is fixed in axis in photonic crystal fiber connection, and the optical fiber is characterized in that: the dead axle of photonic crystal fiber for the second time, the optical fiber head that stretches out fixture V type groove is put into on the optic fibre cutting knife, and this optical fiber head is fixed through first fixing device and second fixing device, and the tool bit of optic fibre cutting knife is located between first fixing device and the second fixing device for the photonic crystal fiber between first fixing device and the second fixing device cuts.
7. The apparatus of claim 6, wherein the optical fiber is fixed in axis in photonic crystal fiber connection, and the optical fiber is characterized in that: fixing the photonic crystal fiber, rotating the second fixing device by 90 degrees, twisting the photonic crystal fiber between the first fixing device and the second fixing device by 90 degrees, and cutting by a cutter head to form an end face angle of a 15-degree inclined plane on the photonic crystal fiber.
8. The apparatus of claim 7, wherein the optical fiber is fixed in axis in photonic crystal fiber connection, and the apparatus comprises: the wafer is divided into a plurality of arrays, the arrays are divided into a plurality of discrete units, each discrete unit is provided with only one wafer V-shaped groove, and the cutting direction is parallel to the wafer V-shaped grooves on the arrays.
9. The apparatus of claim 8, wherein the optical fiber is fixed in axis in photonic crystal fiber connection, and the apparatus comprises: the depth of the etched wafer V-shaped groove is 45-52 mu m, the width is 95-105 mu m, and the distance between the adjacent wafer V-shaped grooves is 1.3-1.6 mm; when the wafer is cut into the array, the wafer is cut in the direction perpendicular to the V-shaped groove of the wafer, and the length of the V-shaped groove of the wafer in each array obtained by cutting is the same and is 1.9 mm-2.2 mm.
10. The apparatus of claim 8, wherein the optical fiber is fixed in axis in photonic crystal fiber connection, and the apparatus comprises: the end face of the wafer cutting array is ground into an inclined plane, the length of the array is 1.8-2 mm, and the inclination angle of the end face is 15 +/-0.5 degrees.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921140903.4U CN210488036U (en) | 2019-07-19 | 2019-07-19 | Optical fiber axis fixing device for photonic crystal fiber connection |
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| CN201921140903.4U CN210488036U (en) | 2019-07-19 | 2019-07-19 | Optical fiber axis fixing device for photonic crystal fiber connection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112485861A (en) * | 2020-11-24 | 2021-03-12 | 法尔胜泓昇集团有限公司 | Method for stripping coating layer of optical fiber for high-power laser test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112485861A (en) * | 2020-11-24 | 2021-03-12 | 法尔胜泓昇集团有限公司 | Method for stripping coating layer of optical fiber for high-power laser test |
| CN112485861B (en) * | 2020-11-24 | 2022-07-15 | 江苏法尔胜光电科技有限公司 | Optical fiber coating layer stripping method for high-power laser test |
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