CN111679369A - High-power laser coupling structure - Google Patents
High-power laser coupling structure Download PDFInfo
- Publication number
- CN111679369A CN111679369A CN202010462463.5A CN202010462463A CN111679369A CN 111679369 A CN111679369 A CN 111679369A CN 202010462463 A CN202010462463 A CN 202010462463A CN 111679369 A CN111679369 A CN 111679369A
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- China
- Prior art keywords
- optical fiber
- self
- ferrule
- contact pin
- common single
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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
- G02B6/26—Optical coupling means
- G02B6/262—Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
-
- 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
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
A high power laser coupling structure comprising: the device comprises a first contact pin, a second contact pin and a sleeve. The optical fiber group is permanently fixed in the inserting core by using epoxy glue; the contact piece is placed in the shell; the contact piece and the contact piece are butted in the sleeve. The invention is suitable for high-power laser transmission, has low insertion loss and low laser energy density of the optical end face, effectively prevents the optical end face from being ablated by laser, and has small processing difficulty.
Description
Technical Field
The invention relates to the field of optical fiber connectors, in particular to a high-power optical fiber connector.
Background
The traditional single-mode optical fiber connector mostly adopts a physical connection mode, namely, the end face of a single-mode optical fiber is in direct contact with the end face of the single-mode optical fiber so as to realize low-loss transmission of optical signals. The connection mode is not suitable for high-power laser transmission application and mainly comprises the following aspects:
1. when the traditional single-mode optical fiber connector is used for high-power laser transmission, the laser power density of the output end face and the input end face of the optical fiber is high, and once the laser power density exceeds the damage threshold of an optical fiber material, the end face of the optical fiber is easily burnt, and the light energy cannot be continuously transmitted.
2. When high-power laser passes through the output end surface and the input end surface of the optical fiber, the tiny surface quality defects of the end surface of the optical fiber, such as impurities, scratches, micro defects and the like, cause abnormal absorption of laser energy, lead to the end surface of the optical fiber to be burnt and cannot continuously transmit light energy.
3. When high-power laser passes through the output end surface and the input end surface of the optical fiber, any pollutants on the end surface of the optical fiber, such as dust, dirt and the like, can cause abnormal absorption of laser energy, lead to the end surface of the optical fiber to be burnt, and cannot continuously transmit light energy.
4. When the traditional physical contact type single-mode optical fiber connector is repeatedly plugged and pulled out for use, the end face of an optical fiber is easily worn, once the end face of the optical fiber is damaged, the damaged end face of the optical fiber is easily subjected to abnormal absorption of laser energy when transmitting high-power laser, the end face of the optical fiber is burnt, and light energy cannot be continuously transmitted.
Aiming at the application requirements of the high-power laser single-mode transmission, a non-contact optical fiber connector adopting a lens for expanding beams is provided at present, but the connector adopts the lens for non-contact connection between optical fibers, and has the defects of large transmission loss, poor interchangeability, large difficulty in part processing and assembly and high cost.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a high-power laser coupling structure, and particularly provides an optical fiber connector for high-power laser transmission, which has the advantages of good performance, high reliability, small processing and assembling difficulty, low precision requirement and long service life.
The above purpose of the invention is realized by the following technical scheme:
a high power laser coupling structure comprising: the device comprises a first contact pin, a second contact pin and a sleeve;
the first contact pin and the second contact pin are radially fixed through the sleeve, so that the first contact pin and the second contact pin are axially centered; the contact end surfaces of the first contact pin and the second contact pin are positioned in the sleeve;
the first contact pin and the second contact pin both comprise: self-focusing optical fiber, common single-mode optical fiber and ferrule;
the self-focusing optical fiber and the common single-mode optical fiber are fused to form an integrated structure in modes of laser or arc discharge and the like, and a connection point of the self-focusing optical fiber and the common single-mode optical fiber is used as a fusion point;
the core insert is of an axial hollow structure, and the self-focusing optical fiber and the common single-mode optical fiber are circumferentially wrapped and fixed with the core insert; the welding point is positioned inside the inserting core;
the self-focusing optical fiber and the common single-mode optical fiber have the same outer diameter size, and a fusion point formed by melting the self-focusing optical fiber and the common single-mode optical fiber also has the same outer diameter size as the fusion point.
The front end face of the self-focusing optical fiber retracts into the ferrule, and the axial distance between the front end face of the self-focusing optical fiber and the front end face of the ferrule ranges from 0 mm to 0.5 mm.
The end face of the inserting core is provided with a chamfer.
The self-focusing optical fiber, the common single-mode optical fiber and the inserting core are fixedly bonded through epoxy glue.
The outer wall of the inserting core is in interference fit with the inner wall of the sleeve.
Compared with the prior art, the invention has the following advantages:
1) the invention adopts the self-focusing optical fiber to enlarge the beam diameter of the common single-mode optical fiber by 3-5 times or more, thereby greatly reducing the laser energy density on the end surface of the optical fiber, effectively preventing the end surface of the optical fiber from being ablated, and improving the laser power difficult-to-bear capacity of the whole device to dozens of watts or more.
2) The invention adopts the self-focusing optical fiber with the same outer diameter as the common single-mode optical fiber to carry out beam shaping, thereby effectively improving the precision of the assembly process and realizing the low-loss and high-reliability transmission of high-power laser; meanwhile, the assembly process difficulty is greatly reduced, so that the processing cost is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a coupling device according to the present invention;
FIG. 2 is a schematic diagram of a pin structure according to the present invention;
FIG. 3 is a schematic diagram of the structure and beam shaping principle of the optical fiber set according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
the invention provides a high-power laser coupling structure which is suitable for high-power laser transmission and has the advantages of low loss, high reliability, low assembly difficulty and long service life.
A high power laser coupling structure comprising: a first pin 1, a second pin 2 and a sleeve 3. The first contact pin 1 and the second contact pin 2 are radially fixed through the sleeve 3, so that the axial alignment of the first contact pin 1 and the second contact pin 2 is realized; the contact end surfaces of the first contact pin 1 and the second contact pin 2 are positioned in the sleeve 3; first pin 1, second pin 2 all include: a self-focusing optical fiber 301, a common single mode optical fiber 302 and a ferrule 202;
the self-focusing optical fiber 301 and the common single-mode optical fiber 302 are fused to form an integrated structure through laser or arc discharge and other modes, so that the self-focusing optical fiber 301 and the common single-mode optical fiber 302 are permanently and fixedly connected. The connection point of the self-focusing optical fiber 301 and the common single-mode optical fiber 302 is used as a fusion point 303;
the ferrule 202 is of an axial hollow structure, and the self-focusing optical fiber 301 and the common single-mode optical fiber 302 circumferentially wrap the fixed ferrule 202; the welding point 303 is positioned inside the ferrule 202;
the self-focusing optical fiber 301 has the same outer diameter as that of the common single-mode optical fiber 302, and the fusion point 303 formed by melting the two optical fibers also has the same outer diameter as that of the two optical fibers.
The front end face 203 of the self-focusing optical fiber 301 retracts into the ferrule 202, and the axial distance between the front end face 203 of the self-focusing optical fiber 301 and the front end face 204 of the ferrule 202 ranges from 0 mm to 0.5 mm. The end face of the ferrule 202 is provided with a chamfer. The self-focusing optical fiber 301, the common single-mode optical fiber 302 and the ferrule 202 are fixed by epoxy glue. The outer wall of the ferrule 202 and the inner wall of the sleeve 3 are interference fit.
Examples
As shown in fig. 1, which is a schematic structural diagram of a coupling device, it can be known that a high power laser coupling structure includes a first pin 1, a second pin 2 and a sleeve 3. The outer diameter of the ferrule 202 has extremely high precision, the tolerance is less than 0.5 μm, the first pin 1 and the second pin 2 are radially fixed by the sleeve 3, and the first pin 1 and the sleeve 3 and the second pin 2 and the sleeve 3 are in high-precision interference fit, so that the axis between the first pin 1 and the sleeve 3 is kept in precise centering.
As shown in fig. 2, which is a schematic structural diagram of an optical fiber group, it can be seen that each of the first stub 1 and the first stub 2 includes an optical fiber group 201, a ferrule 202, an optical fiber group front end face 203, and a ferrule front end face 204. The ferrule 202 is of a hollow structure along the axial direction, the concentricity precision is extremely high, and the tolerance is less than 0.3 mu m; the inner diameter of the optical fiber group insertion core is consistent with the outer diameter of the optical fiber group insertion core 202, so that precise assembly can be realized; the outer diameter of the optical fiber group 201 and the inner diameter of the ferrule 202 are precisely matched, and the gap between the two is less than 0.5 mu m; when the optical fiber group 201 penetrates into the hollow structure of the ferrule 202, the axis of the optical fiber group 201 can keep high coaxiality with the axis of the ferrule 202, and the deviation is less than 0.4 μm. The front end face 203 of the optical fiber group is ensured to be retracted into the ferrule 202, and the distance range between the front end face 203 of the optical fiber group and the front end face 204 of the ferrule is 0-0.5mm, so that the situation that the front end face 203 of the optical fiber group is damaged due to collision and pollution and high-power laser transmission cannot be realized is effectively prevented. The optical fiber connector can also effectively prevent the first contact pin and the second contact pin from damaging the end face of the optical fiber due to collision and pollution in the repeated plugging process, so that high-power laser transmission can not be realized, and the long service life of the optical fiber connector is ensured.
When the first pin 1 and the second pin 2 are inserted into the sleeves, the deviation of the axes between the optical fiber group 201 in the first pin 1 and the optical fiber group 201 in the second pin 1 is less than 0.7 μm, and high-precision alignment of the axes of the optical fiber group 201 is realized, so that low-loss optical signal transmission is realized.
As shown in fig. 3, the optical fiber set 201 includes a self-focusing optical fiber 301, a common single-mode optical fiber 302, and a fusion-splicing point 303. The self-focusing optical fiber 301 and the common single-mode optical fiber 302 are fused by laser or arc discharge to form a fusion point 303, so that low-loss integrated permanent fixed connection is realized. The self-focusing optical fiber 301 collimates and shapes the light beam output by the common single-mode optical fiber 302 into a nearly parallel light beam, so that the energy density of the high-power laser beam on the end face of the output optical fiber is greatly reduced, and the ablation of the end face of the optical fiber is effectively prevented.
The self-focusing optical fiber has 0.25P pitch; the self-focusing optical fiber collimates and shapes the light beam output by the common single-mode optical fiber into a nearly parallel light beam, and the light beam is directly expanded by 3-5 times or more, so that the energy density of the high-power laser beam on the end face of the output optical fiber is greatly reduced, the ablation of the end face of the optical fiber is effectively prevented, and the laser power difficulty of the whole device is improved to tens of watts or more. In addition, according to the reversibility of the optical path, the self-focusing optical fiber can simultaneously converge and inject parallel light beams into a common single-mode optical fiber. Therefore, the large-mode-field nearly-parallel light beams output by the optical fiber group in the first pin can be received by the optical fiber group in the second pin, so that coupling and splicing transmission of the laser light beams in the optical fibers can be realized.
The self-focusing optical fiber has the same outer diameter size with the common single-mode optical fiber. The two are fused into an integrated structure by laser or arc discharge and the like, so that low-loss permanent fixed connection is realized. Meanwhile, the fusion point formed by fusing the self-focusing optical fiber and the common single-mode optical fiber has the same outer diameter size with the self-focusing optical fiber and the common single-mode optical fiber, so that the optical fiber group is conveniently and precisely packaged in the ferrule, the processing and assembling difficulty is reduced, and the optical fiber group in the first contact pin can be ensured to have extremely high axis centering precision, thereby realizing excellent optical transmission performance with coupling connection loss lower than 0.4 dB.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (6)
1. A high power laser coupling structure, comprising: a first contact pin (1), a second contact pin (2) and a sleeve (3);
the first contact pin (1) and the second contact pin (2) are radially fixed through the sleeve (3), so that the axial alignment of the first contact pin (1) and the second contact pin (2) is realized; the contact end surfaces of the first contact pin (1) and the second contact pin (2) are positioned in the sleeve (3);
the first pin (1) and the second pin (2) both comprise: a self-focusing optical fiber (301), a common single-mode optical fiber (302) and a ferrule (202);
the self-focusing optical fiber (301) and the common single-mode optical fiber (302) are fused to form an integrated structure in a laser or arc discharge mode, and the connection point of the self-focusing optical fiber (301) and the common single-mode optical fiber (302) serves as a fusion point (303);
the ferrule (202) is of an axial hollow structure, and the fixed ferrule (202) is circumferentially wrapped and fixed by the self-focusing optical fiber (301) and the common single-mode optical fiber (302); the fusion point (303) is located inside the ferrule (202).
2. A high power laser coupling structure according to claim 1, wherein the self-focusing optical fiber (301) has the same outer diameter as the common single mode optical fiber (302), and the fusion point (303) formed by fusing the self-focusing optical fiber and the common single mode optical fiber has the same outer diameter as the common single mode optical fiber.
3. The high-power laser coupling structure according to claim 1, wherein the front end face (203) of the self-focusing fiber (301) is retracted into the ferrule (202), and the axial distance between the front end face (203) of the self-focusing fiber (301) and the front end face (204) of the ferrule (202) ranges from 0 mm to 0.5 mm.
4. A high power laser coupling structure according to any one of claims 1 to 3, wherein the end face of the ferrule (202) is chamfered.
5. The high-power laser coupling structure according to claim 4, wherein the self-focusing optical fiber (301), the common single-mode optical fiber (302) and the ferrule (202) are fixed by epoxy glue.
6. A high power laser coupling structure according to claim 4, characterized in that the outer wall of the ferrule (202) and the inner wall of the sleeve (3) are in interference fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010462463.5A CN111679369A (en) | 2020-05-27 | 2020-05-27 | High-power laser coupling structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010462463.5A CN111679369A (en) | 2020-05-27 | 2020-05-27 | High-power laser coupling structure |
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| CN111679369A true CN111679369A (en) | 2020-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010462463.5A Pending CN111679369A (en) | 2020-05-27 | 2020-05-27 | High-power laser coupling structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112526680A (en) * | 2020-11-23 | 2021-03-19 | 武汉唐联光电科技有限公司 | Optical fiber plug and optical fiber coupler |
| CN112731594A (en) * | 2021-03-31 | 2021-04-30 | 武汉光谷航天三江激光产业技术研究院有限公司 | Intelligent optical fiber coupling system and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106772828A (en) * | 2016-12-08 | 2017-05-31 | 中国航天时代电子公司 | A kind of contactless optical fiber connector |
| CN109307912A (en) * | 2017-07-28 | 2019-02-05 | 住友电气工业株式会社 | Optical fiber connector and its manufacturing method, optical device, optical transceiver |
| CN109414347A (en) * | 2016-07-13 | 2019-03-01 | 诺华股份有限公司 | Improved fiber coupling reliability |
-
2020
- 2020-05-27 CN CN202010462463.5A patent/CN111679369A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109414347A (en) * | 2016-07-13 | 2019-03-01 | 诺华股份有限公司 | Improved fiber coupling reliability |
| CN106772828A (en) * | 2016-12-08 | 2017-05-31 | 中国航天时代电子公司 | A kind of contactless optical fiber connector |
| CN109307912A (en) * | 2017-07-28 | 2019-02-05 | 住友电气工业株式会社 | Optical fiber connector and its manufacturing method, optical device, optical transceiver |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112526680A (en) * | 2020-11-23 | 2021-03-19 | 武汉唐联光电科技有限公司 | Optical fiber plug and optical fiber coupler |
| CN112526680B (en) * | 2020-11-23 | 2022-07-08 | 武汉唐联光电科技有限公司 | Optical fiber plug and optical fiber coupler |
| CN112731594A (en) * | 2021-03-31 | 2021-04-30 | 武汉光谷航天三江激光产业技术研究院有限公司 | Intelligent optical fiber coupling system and method |
| CN112731594B (en) * | 2021-03-31 | 2021-08-17 | 武汉光谷航天三江激光产业技术研究院有限公司 | Intelligent optical fiber coupling system and method |
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Application publication date: 20200918 |