CN216133220U - Coupling optical fiber and optical fiber jumper wire - Google Patents
Coupling optical fiber and optical fiber jumper wire Download PDFInfo
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- CN216133220U CN216133220U CN202120699404.XU CN202120699404U CN216133220U CN 216133220 U CN216133220 U CN 216133220U CN 202120699404 U CN202120699404 U CN 202120699404U CN 216133220 U CN216133220 U CN 216133220U
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Abstract
The utility model provides a coupling optical fiber and an optical fiber jumper wire, wherein the coupling optical fiber comprises a main body section and a coupling end which are connected with each other, the side surface of the coupling end is gathered from front to back until the coupling end is connected with the main body section in an arc shape, the main body section comprises a first optical fiber section and a second optical fiber section which are connected with each other, the coupling end is connected with the first optical fiber section, the second optical fiber section is an energy transmission optical fiber, the energy transmission optical fiber comprises a fiber core, a cladding for cladding the fiber core and a coating layer coated on the outer surface of the cladding, and the optical fiber jumper wire comprises the coupling optical fiber and a ceramic ferrule. Compared with the traditional optical fiber patch cord, the receiving area of the coupling end is enlarged, so that the damage threshold of the end face of the optical fiber is improved; compare the great QBH of butt fusion volume and connect, this scheme is simple and easy, need not complicated technology, and has higher yields. And the gravity of the coupling end is very small, the strength of the optical fiber can be supported, and a supporting structure is not required to be additionally arranged to support the coupling end, so that the cost is low.
Description
Technical Field
The utility model relates to the technical field of lasers, in particular to a coupling optical fiber and an optical fiber jumper.
Background
The fiber laser has the advantages of better beam quality, low maintenance cost, high conversion efficiency and the like, and the share of the fiber laser in the market is increasing in recent years, so that the fiber laser has wide application in the fields of industrial processing, medical treatment, scientific research, national defense and the like. The optical fiber and the optical fiber jumper wire are used as a transmission medium between the output laser of the laser and external processing equipment and are an important component of the optical fiber laser.
The existing optical fiber and the laser are generally connected in two ways to lead out the laser emitted by the laser: referring to fig. 1, the cut end surface S of the optical fiber 1' is directly connected to a laser, but when the optical fiber end surface S in this connection mode meets a high-power laser, there is a greater risk of burning the optical fiber due to the higher power density; secondly, referring to fig. 2 and 3, a quartz end cap 2 ' and 3 ' are welded at the coupling end of an optical fiber 1 ', and the quartz end cap 2 ' and 3 ' are butted with a laser, so that the risk of burning the optical fiber can be reduced, but generally, the quartz end cap 2 ' and 3 ' has a large volume and a heavy mass, and a supporting and fixing structure (such as a glass sleeve) needs to be additionally arranged to support and fix the quartz end cap 2 ' and 3 ', so as to ensure that the optical fiber is not broken by the weight of the quartz end cap 2 ' and 3 ', but the manufacturing difficulty is increased; meanwhile, before the quartz end caps 2 ' and 3 ' are fused with the optical fiber 1 ', the two end caps are independent of each other, usually the quartz end caps 2 ' and 3 ' and the optical fiber 1 ' are made of different materials (such as different doping), and coating layers are stripped near the fusion points of the optical fiber 1 ' and the tapered end caps 2 ' and 3 ', so that the fusion points are very fragile, and thus, in later use, the fusion points are still easily damaged even if a supporting and fixing structure supports the fusion points. The quartz end cap 2 'shown in fig. 2 is a rectangular structure, the edge line of which is a straight line, and the quartz end cap 3' shown in fig. 3 is a conical table structure, the generatrix connecting the two bottom surfaces is a straight line, the two structures have larger volumes, and the optical fibers with the two structures have higher cost.
There is a need for a new optical fiber and optical fiber patch cord that overcomes the above-mentioned problems.
SUMMERY OF THE UTILITY MODEL
An object of an embodiment of the present invention is to provide a coupling fiber, which is low in cost and has a high damage threshold.
The utility model provides a coupling optical fiber which comprises a main body section and a coupling end, wherein the main body section and the coupling end are mutually connected, and the side surface of the coupling end is continuously and smoothly gathered in an inward arc shape from front to back until the coupling end is in arc connection with the main body section.
Further, the main body section comprises a first optical fiber section and a second optical fiber section which are connected with each other, the coupling end is connected with the first optical fiber section, the second optical fiber section is an energy transmission optical fiber, and the energy transmission optical fiber comprises a fiber core, a cladding covering the fiber core and a coating layer coated on the outer surface of the cladding.
Further, the coupling end and the first optical fiber section are made of the same bare fiber, and the bare fiber only includes a fiber core and a cladding covering the fiber core.
Further, the coupling end is formed by forward and backward extrusion of one end of the bare fiber by a fiber pressing device in a molten state, and the other part of the bare fiber is the first fiber section connected with the second fiber section.
Furthermore, the front end face of the coupling end is an incident face which is flat and smooth, the incident face is a circular plane or a similar circular plane, the coupling end is of a regular axisymmetric structure, and the overall shape of any bus on the cross section of the coupling end is a concave arc or a combination of a concave arc and a convex arc.
Further, the effective diameter of the incident surface is D, the distance between the incident surface and the first optical fiber section is H, D > 2HN, and N is the numerical aperture of the laser beam incident on the incident surface.
The utility model provides an optical fiber jumper, wherein the optical fiber is the coupling optical fiber.
Further, a ferrule is included, the body segment extends through the ferrule, and the coupling end is located outside of the ferrule.
Further, the main body section comprises a first optical fiber section and a second optical fiber section which are connected with each other, the first optical fiber section penetrates through the ferrule and is connected with the second optical fiber section at the tail part of the ferrule, the surface of the second optical fiber section is coated with a coating layer, and a preset interval is arranged between the coupling end and the head part of the ferrule.
Further, the ceramic ferrule is provided with a through hole, the first optical fiber section is positioned in the through hole, and the aperture of the through hole is smaller than the outer diameter of the energy transmission optical fiber and smaller than the radius of the incident surface of the coupling end.
The coupling optical fiber and the optical fiber jumper wire provided by the utility model have the following beneficial effects: compared with the traditional optical fiber patch cord, the receiving area of the coupling end is enlarged, so that the damage threshold of the end face of the optical fiber is improved; compare the great quartz end cap of butt fusion volume, this scheme is simple and easy, need not complicated technology, and has higher yields. And the gravity of the coupling end is very small, the strength of the optical fiber can be supported, and a supporting structure is not required to be additionally arranged to support the coupling end, so that the cost is low.
Drawings
FIG. 1 is a schematic diagram of a conventional optical fiber;
FIG. 2 is a schematic view of a prior art optical fiber connected to a quartz end cap;
FIG. 3 is a schematic diagram of a conventional optical fiber jumper connected to another quartz end cap;
FIG. 4 is a schematic diagram of a first embodiment of a coupling fiber according to the present invention;
FIG. 5 is a schematic diagram of a fiber optic patch cord according to one embodiment of the present invention;
FIG. 6 is a schematic diagram of an embodiment of a coupling fiber according to the present invention;
FIG. 7 is a schematic diagram of an optical fiber patch cord according to an embodiment of the present invention;
in the figure:
1 coupling optical fiber; 11. 11' bare optical fiber; 111. a 111' coupling end; 1111. 1111' incidence plane; 1112. 1112' bus bar; 112 a first fiber segment; 12 energy transmission optical fiber; a fiber core; b cladding; c, coating;
2, optical fiber jumpers; 21 a ceramic ferrule;
1' an optical fiber; 2 '3' quartz end caps.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings.
Example one
Referring to fig. 4, the present invention provides a coupling optical fiber 1, which mainly includes a main body section and a coupling end 111 connected to each other, wherein a side surface of the coupling end 111 converges from front to back in an arc shape until being connected to the main body section in an arc shape, that is, a generatrix 1112 of the side surface is an arc, an area of a minimum longitudinal section (a section perpendicular to a laser propagation direction in the optical fiber) of the coupling end 111 is equal to an area of a longitudinal section of the main body section, and an area of a longitudinal section of the coupling end 111 along the laser propagation direction has a gradually decreasing trend, but it is not excluded that an area of some longitudinal sections is slightly larger than an area of a longitudinal section located in front of or behind the coupling end, that is, the generatrix 1112 is allowed to have an error-allowable fluctuation, and since the side surface of the coupling end 111 converges from front to back in an arc shape until being connected to the main body section in an arc shape, the coupling end 111 has a larger laser incidence area, so that an energy density can be effectively reduced, the damage threshold can be effectively improved, so that the semiconductor laser can be directly assembled on a proper semiconductor laser, and meanwhile, the side surface of the coupling end 111 has a larger side area, so that the heat dissipation efficiency is high, and the damage threshold is further improved.
Referring to fig. 4, the main body segment includes a first optical fiber segment 112 and a second optical fiber segment connected to each other, the coupling end 111 is connected to the first optical fiber segment 112, the second optical fiber segment is an energy transmission optical fiber 12, and the energy transmission optical fiber 12 includes a fiber core a, a cladding layer b covering the fiber core a, and a coating layer c coated on an outer surface of the cladding layer b. The coupling end 111 and the first optical fiber section 112 are made of the same bare fiber 11, and the bare fiber 11 only includes a fiber core a and a cladding layer b covering the fiber core a, and has no coating layer c. In this embodiment, the coupling end 111 is formed by forward and backward extrusion of one end of the bare fiber 11 by a fiber pressing device in a molten state, and the other part of the bare fiber 11 is the first fiber segment 112 connected to the energy transmission fiber 12.
The process for preparing the coupling optical fiber 1 comprises the following steps:
s1, selecting an optical fiber, removing the coating layer c at one end of the optical fiber, and designing the length of the bare fiber 11 as the coating-free region according to actual needs, wherein the optical fiber region without the coating layer removed is the energy-transfer optical fiber 12.
S2, the free end of the bare fiber 11 is heated under a heat source to soften the free end, and the end surface of the free end is pressed from front to back (i.e., fiber pressing) by a fiber pressing device to shrink the end surface back and expand the edge of the end surface to the periphery until the coupling end 111 shown in fig. 4 is formed. In order to ensure the quality of fiber pressing, the heating temperature of a heat source needs to be controlled by combining the material of the optical fiber during fiber pressing, and the temperature, the fiber pressing time, the speed and the like of a fiber pressing device are controlled simultaneously.
The fiber pressing device may be a metal plate, but the fiber pressing surface of the metal plate may not be an absolute plane, so after the fiber pressing is finished and the coupling end 11 is cooled, the formed coupling end 11 is coated with a grinding paste (such as paraffin, rosin, etc.) to grind and polish the incident surface 1111 of the coupling end 11, so that the incident surface 1111 of the coupling end 11 is flat and smooth. According to actual needs, an antireflection film can be plated on the incident surface 1111, and the transmittance of laser transmitted through the incident surface 1111 can be increased by 4% through the antireflection film plating, so that the laser power in the optical fiber can be increased.
In this embodiment, the incident surface 1111 is a circular plane or a quasi-circular plane, and the coupling end 11 is a regular axisymmetric structure, and the overall shape of any generatrix 1112 on the cross section of the coupling end 111 is a concave arc (as shown in fig. 4), but it is also allowed that there may be fluctuation allowed by error on the concave arc. Defining the effective diameter of the entrance face 1111 as D, and the distance between the entrance face 1111 and the first fiber section 112 as H, D > 2HN, where N is the numerical aperture of the laser beam incident on the entrance face 1111.
The utility model provides an optical fiber jumper 2, and the optical fiber adopted in the optical fiber jumper 2 is the coupling optical fiber 1. The optical fiber jumper 2 has various structures and compositions according to actual needs, and the embodiment focuses on one of the structures.
Referring to fig. 6, the optical fiber jumper 2 according to the embodiment includes a ferrule 21, the first optical fiber segment 112 penetrates through the ferrule 21 and is connected to a second optical fiber segment at a tail of the ferrule 21, a coating layer c is coated on a surface of the second optical fiber segment, and a certain interval is provided between the coupling end 111 and a head of the ferrule 21. The functions of the ferrule 21 include: the first optical fiber section 112 is fixed and protected, and the first optical fiber section 112 is heat-dissipated while preventing heat of the bare optical fiber 11 from being transferred to the energy transmitting optical fiber 12 to damage or age the coating layer c on the surface of the energy transmitting optical fiber 12. The ferrule 21 has a through hole, and the first fiber segment 112 is located in the through hole, and the aperture of the through hole is smaller than the outer diameter of the energy transmitting fiber 12 and smaller than the radius of the incident surface of the coupling end 111.
When the optical fiber jumper wire 2 is prepared, firstly, a coating layer c at one end of an optical fiber is removed, a coating layer-free area, namely the length of a bare optical fiber 11 is designed according to actual needs, and an optical fiber area without the coating layer removed is the energy transfer optical fiber 12; then, the bare fiber 11 is fixed to the ferrule 21 through the through hole, and the free end of the bare fiber 11 is protruded out of the ferrule 21; then, fixing the ferrule 21 with a jig, heating the free end of the bare fiber 11 with a heat source to soften the free end, and simultaneously pressing the end face of the free end from front to back with a fiber pressing device to expand the edge of the end face to the periphery while the end face contracts back until the coupling end 111 is formed, and then grinding and polishing the preliminarily molded and cooled coupling end 111 until the quality of the coupling end 111 is ensured.
Example two
The main difference between the second embodiment and the first embodiment is that the structure of the coupling end, i.e., the coupling end 111 ' in the second embodiment, has a combination of the convex arc, the concave arc and the convex arc starting from the incident surface 1111 ' and continuing to the arc-shaped connection with the bare fiber 11 ' (as shown in fig. 5), allowing the convex arc and the concave arc to have the tolerance fluctuation.
Referring to fig. 7, fig. 7 is a schematic diagram of an optical fiber patch cord related to an embodiment of the present invention, and the structural principle of the optical fiber patch cord is substantially the same as that of the optical fiber patch cord shown in fig. 6, which is not described herein again.
Compared with the traditional optical fiber patch cord, the optical fiber patch cord 2 provided by the utility model has the advantages that the receiving areas of the coupling ends 111 and 111' are enlarged, so that the damage threshold of the end face of the optical fiber is improved. Compared with a QBH joint 2' with larger welding volume, the scheme is simple and easy to implement, does not need complex process and has higher yield. The gravity of the coupling ends 111, 111 'is small, the strength of the optical fiber itself can be supported, and no additional supporting structure is needed to support the coupling ends 111, 111', so that the cost is low. In the present invention, the coupling ends 111 and 111 'are formed by forward and backward extrusion of one end of the bare fibers 11 and 11' by the fiber pressing device in a molten state, so that the coupling ends are more firmly connected with the first optical fiber section 112 at the connection point.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A coupling fiber, characterized by: the coupling end is connected with the main body section in an arc manner; the main body section comprises a first optical fiber section and a second optical fiber section which are connected with each other, the coupling end is connected with the first optical fiber section, the second optical fiber section is an energy transmission optical fiber, and the energy transmission optical fiber comprises a fiber core, a cladding covering the fiber core and a coating layer coated on the outer surface of the cladding.
2. The coupling fiber of claim 1, wherein: the coupling end and the first optical fiber section are made of the same bare fiber, and the bare fiber only comprises a fiber core and a cladding for cladding the fiber core.
3. The coupling fiber of claim 2, wherein: the coupling end is formed by forward and backward extrusion of one end of the bare fiber by a fiber pressing device in a molten state, and the other part of the bare fiber is the first fiber section connected with the second fiber section.
4. The coupling fiber of claim 2, wherein: the front end face of the coupling end is an incident face which is flat and smooth, the incident face is a circular plane or a similar circular plane, the coupling end is of a regular axisymmetric structure, and the overall shape of any bus on the cross section of the coupling end is a concave arc or a combination form of a concave arc and a convex arc.
5. The coupling fiber of claim 4, wherein: the effective diameter of the incident surface is D, the distance between the incident surface and the first optical fiber section is H, D & gt 2HN, and N is the numerical aperture of the laser beam incident on the incident surface.
6. An optical fiber patch cord, comprising: the optical fiber is the coupling optical fiber of any one of claims 1 to 5.
7. The optical fiber patch cord of claim 6, wherein: the ceramic ferrule comprises a ceramic ferrule, wherein the main body section penetrates through the ceramic ferrule, and the coupling end is positioned outside the ceramic ferrule.
8. The optical fiber patch cord of claim 7, wherein: the main body section comprises a first optical fiber section and a second optical fiber section which are connected with each other, the first optical fiber section penetrates through the ceramic ferrule and is connected with the second optical fiber section at the tail part of the ceramic ferrule, the surface of the second optical fiber section is coated with a coating layer, and a preset interval is arranged between the coupling end and the head part of the ceramic ferrule.
9. The optical fiber patch cord of claim 8, wherein: the ceramic ferrule is provided with a through hole, the first optical fiber section is positioned in the through hole, and the aperture of the through hole is smaller than the outer diameter of the energy transmission optical fiber and smaller than the radius of the incident surface of the coupling end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120699404.XU CN216133220U (en) | 2021-04-06 | 2021-04-06 | Coupling optical fiber and optical fiber jumper wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120699404.XU CN216133220U (en) | 2021-04-06 | 2021-04-06 | Coupling optical fiber and optical fiber jumper wire |
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| Publication Number | Publication Date |
|---|---|
| CN216133220U true CN216133220U (en) | 2022-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120699404.XU Active CN216133220U (en) | 2021-04-06 | 2021-04-06 | Coupling optical fiber and optical fiber jumper wire |
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2021
- 2021-04-06 CN CN202120699404.XU patent/CN216133220U/en active Active
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