CN114924354B - Alignment method of multi-core optical fiber - Google Patents
Alignment method of multi-core optical fiber Download PDFInfo
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- CN114924354B CN114924354B CN202210599104.3A CN202210599104A CN114924354B CN 114924354 B CN114924354 B CN 114924354B CN 202210599104 A CN202210599104 A CN 202210599104A CN 114924354 B CN114924354 B CN 114924354B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 147
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005286 illumination Methods 0.000 claims abstract description 36
- 238000003384 imaging method Methods 0.000 claims abstract description 30
- 239000000835 fiber Substances 0.000 claims description 29
- 230000003287 optical effect Effects 0.000 claims description 7
- 238000005253 cladding Methods 0.000 abstract description 4
- 238000004891 communication Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000007526 fusion splicing Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Abstract
The invention discloses an alignment method of a multi-core optical fiber, which comprises the following steps: s1: arranging two optical fibers oppositely and enabling the two optical fibers to be coaxial; s2: the side face of the optical fiber is illuminated by the illumination light source, and illumination light is injected into the optical fiber through the side face of the optical fiber, fills the whole optical fiber and propagates to the end face of the optical fiber; s3: a light reflecting piece is arranged between the two optical fibers, and the light reflecting piece reflects the light transmitted by the end surfaces of the optical fibers by 90 degrees to form reflected light; s4: the CMOS image sensor receives the reflected light, and the reflected light through the two optical fibers forms end face imaging on the CMOS image sensor; s5: rotating one or two optical fibers to make the end surfaces formed by the two optical fibers on the CMOS image sensor consistent in imaging; because of the refractive index difference between the cladding and the core of the optical fiber, the optical fiber has different brightness, and the imaging of the end face of the optical fiber is similar to the cross section of the end face of the optical fiber, so that the end face imaging of the two optical fibers is consistent, and the opposite cores of the connected optical fibers can be basically ensured.
Description
Technical Field
The invention relates to the technical field of optical fiber fusion, in particular to an alignment method of a multi-core optical fiber.
Background
A typical single-mode optical fiber is composed of one core and a cladding surrounding it, but a multi-core optical fiber is a new type of optical fiber in which a plurality of individual cores are present in a common cladding region, as shown in fig. 1. The multi-core optical fiber simultaneously transmits multiple paths of optical signals, so that the communication capacity can be greatly improved, and the limit of the transmission capacity of the current common single-mode optical fiber is broken through. In addition, the multi-core optical fiber can greatly save the space of a machine room and reduce the laying and installation cost of the optical cable. With the development of space division multiplexing related technology and the development of multi-core optical fiber sensing technology, the multi-core optical fiber is an important optical fiber development direction in the future, and the wide application of the multi-core optical fiber in the fields of communication, sensing, industry, medical treatment and the like is fully satisfied.
When the single-core optical fiber is connected, the optical fiber is collimated, and only the end face of the optical fiber needs to be aligned. The multi-core optical fiber is characterized in that a plurality of fiber cores are uniformly distributed in the optical fiber, when the multi-core optical fiber is welded, the end face of the optical fiber is required to be aligned, a certain angle is required to be rotated, and the plurality of fiber cores in the optical fiber to be welded are also required to be aligned.
Disclosure of Invention
In order to solve the technical problems in the background technology, the invention provides an alignment method of a multi-core optical fiber.
The invention provides an alignment method of a multi-core optical fiber, which mainly aims at a 2-12-core optical fiber and comprises the following steps:
s1: arranging two optical fibers oppositely and enabling the two optical fibers to be coaxial;
S2: the side face of the optical fiber is illuminated by the illumination light source, and illumination light is injected into the optical fiber through the side face of the optical fiber, fills the whole optical fiber and propagates to the end face of the optical fiber;
s3: a light reflecting piece is arranged between the two optical fibers, and the light reflecting piece reflects the light transmitted by the end surfaces of the optical fibers by 90 degrees to form reflected light;
s4: the CMOS image sensor receives the reflected light, and the reflected light through the two optical fibers forms end face imaging on the CMOS image sensor;
s5: rotating one or two optical fibers to make the end surfaces formed by the two optical fibers on the CMOS image sensor consistent in imaging;
Because of the refractive index difference between the cladding and the core of the optical fiber, the optical fiber has different brightness, and the imaging of the end face of the optical fiber is similar to the cross section of the end face of the optical fiber, so that the end face imaging of the two optical fibers is consistent, and the opposite cores of the connected optical fibers can be basically ensured.
Specifically, in S3, the light reflecting member is a prism.
As a further optimized scheme of the invention, two S2 illumination light sources are arranged, and the two illumination light sources respectively illuminate the two optical fibers at the same time, so that the two optical fibers can be subjected to end face imaging at the same time, further the working efficiency is increased, and the adjustment of the consistency or the minimum difference of the end face imaging of the two optical fibers is facilitated.
In order to further increase the detection precision, as a further optimized scheme of the invention, the distances from the two illumination light sources to the middle positions of the two optical fibers are equal.
In order to facilitate observation of end face imaging formed by the CMOS image sensor, as a further optimized scheme of the invention, an optical signal amplifying piece is further arranged, the optical signal amplifying piece is arranged between the CMOS image sensor and the light reflecting piece and is used for amplifying reflected light, and the optical signal amplifying piece can be a microscope, an amplifying mirror and the like in the prior art.
In order to further increase the working efficiency, as a further optimized scheme of the invention, the two optical fibers are rotated in S5 so that the end face imaging formed by the two optical fibers on the CMOS image sensor is consistent, and the rotation directions of the two optical fibers are opposite.
In order to further increase the working efficiency, as a further optimized scheme of the invention, the optical fiber rotates along the axial direction during the rotation of the optical fiber in the step S5.
In order to further increase the working efficiency, as a further optimized scheme of the invention, the optical fiber is driven to rotate by the rotating device pair in S5, so that any device capable of driving the cylindrical component to rotate in the prior art can be adopted, and the rotating device can be a rotating base in the prior art.
In order to further increase the precision, as a further optimized scheme of the invention, the method further comprises the following steps:
s6: removing the light reflecting piece from the middle parts of the two optical fibers;
s7: the CMOS image sensor forms a side view image of light refracted by the illumination light through the fiber core;
s8: rotating one or both fibers minimizes the coincidence or difference in side view imaging that the two fibers form on the CMOS image sensor.
Specifically, when one optical fiber performs side view imaging on the CMOS image sensor, the illumination light source positioned on the side surface of the optical fiber is turned on, the illumination light source positioned on the side surface of the other optical fiber is turned off,
As a further optimized scheme of the invention, S6 also comprises the step of approaching the two optical fibers to each other to enable the end faces of the fiber cores of the two optical fibers to be close, so that the CMOS image sensor is opposite to the fiber cores exposed outside of the two optical fibers, and further the detection precision is increased.
According to the alignment method of the multi-core optical fiber, the end face of the multi-core optical fiber can be directly observed, the position information of each fiber core of the two optical fibers is obtained, and the optical fibers are rotated to realize the alignment of the fiber cores of the two optical fibers; further, by imaging the side of each core of the two fibers, precise alignment of the fibers is facilitated according to the fiber side profile.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a prior art fiber optic end view;
FIG. 2 is a schematic diagram of the multi-core fiber end face imaging of the present invention;
fig. 3 is a schematic diagram of a side view of a multi-core fiber in accordance with the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar symbols indicate like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.
It is to be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," and the like are directional or positional relationships as indicated based on the drawings, merely to facilitate describing the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
The alignment method of the multi-core optical fiber shown in fig. 2-3 mainly comprises the following steps of end face imaging and side view imaging of the optical fiber:
s1: clamping the two optical fibers on the rotating base, and enabling the two optical fibers to be coaxial;
S2: a first illumination light source is arranged at a certain distance from one end face of the first optical fiber, which is opposite to the second optical fiber, the first illumination light source is clung to the first optical fiber, a second illumination light source is arranged at a certain distance from one end face of the second optical fiber, which is opposite to the first optical fiber, the second illumination light source is clung to the second optical fiber, and the distances from the first illumination light source and the second illumination light source to the opposite end faces of the first optical fiber and the second optical fiber are equal, namely, the first illumination light source and the second illumination light source are symmetrical relative to the middle parts of the two optical fibers; turning on the first illumination light source and the second illumination light source, so that illumination light rays of the first illumination light source and the second illumination light source inject light into the optical fibers from the side surfaces, and the light rays of the first illumination light source and the second illumination light source respectively fill the first optical fibers and the second optical fibers and spread to the end surfaces of the first optical fibers and the second optical fibers;
s3: a prism is arranged between two optical fibers, a microscope is arranged on one side of the prism, a CMOS image sensor is arranged on one side of the microscope, which is far away from the prism, the illumination optical fibers are reflected inside the optical fibers and then form reflected light rays through the prism, and the reflected light rays are perpendicular to the axis of the optical fibers;
S4: the reflected light forms end face imaging on the CMOS image sensor after passing through the microscope, the microscope amplifies the reflected light, and the microscope can be replaced by the amplifier or the reflected light can be directly irradiated on the CMOS image sensor to form end face imaging (specific end face imaging is shown in figure 2);
S5: the CMOS image sensor is provided with two optical fibers, the end face imaging of the two optical fibers is formed at the same time, whether the positions of dots on the end face imaging of the two optical fibers are consistent or not is compared, if not, the optical fibers are driven to rotate along the axis direction by the rotating base, and then the positions of the dots on the end face imaging are adjusted to be consistent or almost the same;
S6: the prism is moved out from the middle parts of the two optical fibers, the horizontal positions of the two optical fibers are adjusted, the two optical fibers are mutually close to each other, the end faces of fiber cores of the two optical fibers are close to each other, and therefore the CMOS image sensor is opposite to the fiber cores exposed outside of the two optical fibers;
S70: turning off the second illumination source, keeping the first illumination source on, and forming a side view image on the CMOS image sensor through the microscope after the side view image enters the first optical fiber from the side surface and is refracted by the optical fiber, wherein the side view image shows a brightness change curve as shown in fig. 3, and the brightness change curve is defined as an optical fiber profile;
s71: turning off the first illumination light source, turning on the second illumination light source, entering the second optical fiber from the side surface, refracting the second optical fiber through the optical fiber, and forming side view imaging on the CMOS image sensor through a microscope;
S8: the side-view imaging light profiles of the two optical fibers are compared, the optical fibers are driven to rotate through the rotating base, so that the difference of the side-view imaging light profiles of the two optical fibers is minimum, and the optical fiber cores are accurately aligned.
And then fusion-splicing the two aligned optical fibers.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (8)
1. A method of aligning a multicore fiber, comprising the steps of:
s1: arranging two optical fibers oppositely and enabling the two optical fibers to be coaxial;
S2: the side face of the optical fiber is illuminated by the illumination light source, and illumination light is injected into the optical fiber through the side face of the optical fiber, fills the whole optical fiber and propagates to the end face of the optical fiber;
s3: a light reflecting piece is arranged between the two optical fibers, and the light reflecting piece reflects the light transmitted by the end surfaces of the optical fibers by 90 degrees to form reflected light;
s4: the CMOS image sensor receives the reflected light, and the reflected light through the two optical fibers forms end face imaging on the CMOS image sensor;
s5: rotating one or two optical fibers to make the end surfaces formed by the two optical fibers on the CMOS image sensor consistent in imaging;
S6: the light reflection piece is moved out of the middle of the two optical fibers, and the two optical fibers are mutually close to each other, so that the end faces of the fiber cores of the two optical fibers are close to each other;
s7: the CMOS image sensor forms a side view image of light refracted by the illumination light through the fiber core;
s8: rotating one or both fibers causes the side-view imaging formed by both fibers on the CMOS image sensor to coincide.
2. The method of aligning a multicore fiber of claim 1, wherein the light reflecting element in S3 is a prism.
3. The method of aligning a multi-core optical fiber according to claim 1, wherein there are two S2 illumination sources, and the two illumination sources illuminate the two optical fibers at the same time, respectively.
4. A method of aligning a multicore optical fiber according to claim 3, wherein the two illumination sources are equidistant from a location intermediate the two optical fibers.
5. The alignment method of a multi-core optical fiber according to claim 1, further comprising an optical signal amplifying member provided between the CMOS image sensor and the light reflecting member, the optical signal amplifying member being for amplifying the reflected light.
6. The method of aligning multicore fibers according to claim 1, wherein rotating the two fibers in S5 causes the two fibers to form a uniform end face image on the CMOS image sensor.
7. The method of aligning a multicore fiber according to claim 1, wherein the fiber is rotated in the axial direction during the rotation of S5.
8. The method of aligning a multicore fiber according to claim 1, wherein the optical fiber is rotated by the pair of rotating devices in S5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210599104.3A CN114924354B (en) | 2022-05-30 | Alignment method of multi-core optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210599104.3A CN114924354B (en) | 2022-05-30 | Alignment method of multi-core optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114924354A CN114924354A (en) | 2022-08-19 |
| CN114924354B true CN114924354B (en) | 2024-05-31 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132618A (en) * | 2017-04-08 | 2017-09-05 | 邹辉 | A kind of microstructured optical fibers welding system and welding process |
| CN109471223A (en) * | 2018-12-30 | 2019-03-15 | 安徽相和通信有限公司 | Fiber end face optical imagery structure and optical fiber splicer |
| CN110824682A (en) * | 2019-12-25 | 2020-02-21 | 苏州信沃特光电科技有限公司 | Microscopic imaging objective lens for fiber core identification of optical fiber fusion splicer and imaging method thereof |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132618A (en) * | 2017-04-08 | 2017-09-05 | 邹辉 | A kind of microstructured optical fibers welding system and welding process |
| CN109471223A (en) * | 2018-12-30 | 2019-03-15 | 安徽相和通信有限公司 | Fiber end face optical imagery structure and optical fiber splicer |
| CN110824682A (en) * | 2019-12-25 | 2020-02-21 | 苏州信沃特光电科技有限公司 | Microscopic imaging objective lens for fiber core identification of optical fiber fusion splicer and imaging method thereof |
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