CN107290829B - Optical fiber quartz block joint structure and manufacturing method thereof - Google Patents
Optical fiber quartz block joint structure and manufacturing method thereof Download PDFInfo
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- CN107290829B CN107290829B CN201710234020.9A CN201710234020A CN107290829B CN 107290829 B CN107290829 B CN 107290829B CN 201710234020 A CN201710234020 A CN 201710234020A CN 107290829 B CN107290829 B CN 107290829B
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- optical fiber
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- quartz
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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
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
-
- 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
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4206—Optical features
-
- 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
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4292—Coupling light guides with opto-electronic elements the light guide being disconnectable from the opto-electronic element, e.g. mutually self aligning arrangements
Abstract
The invention discloses an optical fiber quartz block joint structure. In an optical fiber quartz block joint structure (A) in which an optical fiber (11) and a quartz block (24) are joined, the optical fiber (11) and a curved surface (24a) of the quartz block (24) bulging toward the optical fiber (11) side are joined together, and the leading end of the optical fiber (11) is located inside the quartz block (24). Therefore, damage due to light not incident on the fiber core or reflected light from the light irradiation target can be reduced.
Description
Technical Field
The invention relates to an optical fiber quartz block joint structure and a manufacturing method thereof.
Background
A structure in which a quartz block is joined to a tip end of an optical fiber for laser transmission is known (for example, patent documents 1 to 4).
In an optical fiber cable for transmitting laser light, an optical fiber jacket of an optical fiber core is carbonized by laser light not incident on the optical fiber core due to axial misalignment or the like in an optical connector on the incident end side, and finally burned. In the optical connector on the side of the emission end, the optical fiber case of the optical fiber core is carbonized by the reflected light from the laser irradiation target, and finally burned. Thus, both of the above cases may cause damage such as breakage of the optical fiber. As a method for preventing the damage, patent document 5 discloses an optical connector structure in which an optical sensor for detecting laser light or reflected light is provided in a space in an optical connector, and the optical sensor is connected to an interlock circuit.
Patent document 1: japanese laid-open patent publication No. 2000-321470
Patent document 2: japanese laid-open patent publication No. 2007-279289
Patent document 3: japanese laid-open patent publication No. 2009-180770
Patent document 4: japanese laid-open patent publication No. 2009-526265
Patent document 5: japanese patent publication No. 2015-505969
Disclosure of Invention
Technical problems to be solved by the invention
The invention aims to: damage due to light not incident on the fiber core or reflected light from a light irradiation object is reduced.
Technical solutions for solving technical problems
The invention relates to an optical fiber quartz block joint structure which is formed by jointing an optical fiber and a quartz block. The optical fiber is joined to a curved surface of the quartz block bulging toward the optical fiber side, and a leading end of the optical fiber is located inside the quartz block.
The invention relates to a method for manufacturing an optical fiber quartz block joint structure, which is formed by jointing an optical fiber and a quartz block, wherein the optical fiber is jointed with a bulged curved surface of the quartz block, and the front end of the optical fiber is positioned in the quartz block.
Effects of the invention
According to the present invention, the optical fiber is joined to the curved surface of the quartz block bulging toward the optical fiber side, and the leading end of the optical fiber is located inside the quartz block. Therefore, among the light not incident on the optical fiber due to the misalignment, the light emitted toward the space through the vicinity of the joint portion between the optical fiber and the quartz block is refracted at the curved surface of the quartz block, and the light is suppressed from being transmitted in the direction along the optical fiber, and the light is enlarged due to the lens effect of the curved surface of the quartz block, and the power density is reduced. As a result, damage due to the light not incident on the optical fiber core or reflected light from the light irradiation target can be reduced.
Drawings
Fig. 1 is a sectional view of an optical connector structure according to an embodiment.
Fig. 2 is a perspective view of an optical fiber according to an embodiment.
Fig. 3 is a cross-sectional view of an optical fiber quartz block joint structure according to the embodiment.
Fig. 4A is a diagram illustrating an operation of the optical fiber quartz block bonding structure according to the embodiment.
Fig. 4B is a diagram showing the operation of the optical fiber quartz block splicing construction in the related art.
Fig. 5 is an enlarged cross-sectional view of the optical fiber quartz block joint structure according to the embodiment.
Fig. 6A is a cross-sectional view of the optical fiber quartz block joint structure according to the embodiment when the amount of the optical fiber inserted is minimum.
Fig. 6B is a cross-sectional view of the optical fiber quartz block joint structure according to the embodiment when the amount of fiber intrusion is larger than the minimum value.
Fig. 7A is a first diagram illustrating a method of manufacturing an optical fiber quartz block joint structure according to an embodiment.
Fig. 7B is a second diagram illustrating a method for manufacturing an optical fiber quartz block joint structure according to the embodiment.
Fig. 7C is a third diagram illustrating a method for manufacturing an optical fiber quartz block joint structure according to the embodiment.
Fig. 7D is a fourth diagram illustrating a method of manufacturing an optical fiber quartz block joint structure according to the embodiment.
Fig. 7E is a fifth diagram illustrating a method of manufacturing an optical fiber quartz block joint structure according to the embodiment.
Fig. 8 is a diagram illustrating a modification of the method for manufacturing the optical fiber quartz block junction structure according to the embodiment.
-description of symbols-
A-optical fiber quartz block joint structure; 11-an optical fiber; 24-quartz block; 24a, 25-curved surface; 24 a' -plane.
Detailed Description
The embodiments are described in detail below with reference to the drawings.
Fig. 1 shows an optical connector structure C according to an embodiment. The optical connector structure C according to the present embodiment is configured at the incident end and/or the emission end of the optical fiber cable for laser transmission mounted in, for example, a laser processing machine.
The optical connector 20 is attached to the optical fiber core 10, thereby constituting the optical connector structure C according to the embodiment.
Fig. 2 shows an optical fiber core 10 according to an embodiment.
The optical fiber core 10 has an optical fiber 11 and an optical fiber jacket 12 covering the optical fiber 11. The optical fiber core wire 10 has an outer diameter of, for example, 1.3 mm.
The optical fiber 11 has a core 11a having a relatively high refractive index and a cladding 11b covering the core 11a and having a relatively low refractive index. The core 11a of the optical fiber 11 is made of, for example, pure silica, and the cladding 11b is made of silica doped with a dopant that lowers the refractive index. The outer diameter of the optical fiber 11 is, for example, 500 μm. The core 11a has a diameter of, for example, 100 μm. The Numerical Aperture (NA) of the core 11a is, for example, 0.20. The optical fiber 11 may further include an outer sheath covering the cladding 11b from the outside.
The fiber housing 12 may be formed of a single layer or a double layer. Wherein the single layer is formed of an ultraviolet-curable resin, a thermosetting resin, or the like; the double layer is composed of an inner cushion layer formed of, for example, silicone resin, and an outer cover layer covering the inner cushion layer and formed of nylon resin or fluororesin.
The end of the optical fiber core 10 located in the optical connector 20 includes an optical fiber exposed portion 10a on the front end side and an optical fiber housing covering portion 10b on the rear end side of the optical fiber exposed portion 10a and covered with the optical fiber housing 12.
The optical fiber exposed portion 10a is not covered with the optical fiber case 12, and the optical fiber 11 protrudes and is exposed. A stripper 13 is provided on the outer peripheral surface of the protruding and exposed optical fiber 11. Here, the stripper 13 means a processed shape for excluding light transmitted along the cladding 11b of the optical fiber 11 to the outside of the optical fiber 11. The stripper 13 can be formed by, for example, etching the outer peripheral surface of the optical fiber 11. When the optical fiber 11 has an outer sheath, the stripper 13 is formed on the outer sheath.
The optical connector 20 has a connector body 21 formed of a cylindrical member. An optical fiber housing space 21a and a core wire fitting portion 21b are formed inside the connector body 21. Wherein the optical fiber receiving space 21a extends in a longitudinal direction at a middle portion of the connector body 21 and has a large inner diameter; the core wire fitting portion 21b is integrally connected to the rear of the optical fiber accommodating space 21a and has a small inner diameter. A block housing space 21c is formed at the front end side of the optical fiber housing space 21a inside the connector body 21, and the block housing space 21c is integrally connected to the optical fiber housing space 21 a. An annular sealing member 22 is fitted into the distal end portion of the optical fiber accommodating space 21a, and a cylindrical optical fiber support member 23 is fitted into an opening of the sealing member 22. The inner wall of the connector body 21 forming the optical fiber receiving space 21a may be formed as a rough surface to scatter light. The quartz block 24 is accommodated in the block accommodating space 21 c.
In the optical connector structure C, the end of the optical fiber core 10 is inserted from the rear of the optical connector 20, the tip of the optical fiber exposed portion 10a is fitted into the optical fiber supporting member 23 and supported by the optical fiber supporting member 23, the portion of the optical fiber exposed portion 10a constituting the stripper 13 extends in the longitudinal direction in the optical fiber accommodating space 21a, and the optical fiber housing covering portion 10b is fitted into the core embedding portion 21b and supported by the core embedding portion 21 b. The end face of the optical fiber housing 12 of the optical fiber housing covering portion 10b is exposed to the optical fiber receiving space 21 a.
The tip of the optical fiber 11, which is the optical fiber exposed portion 10a exposed from the optical fiber support member 23, is joined to the quartz block 24 housed in the block housing space 21 c. The front end side portion of the quartz block 24 is cylindrical, the rear end side portion of the quartz block 24 is conical, the top of the conical rear end side portion is a curved surface 24a bulging toward the optical fiber 11 side, i.e., the rear side, and the front end of the optical fiber 11 is joined to the curved surface 24a of the top of the rear end side portion of the quartz block 24.
Fig. 3 shows an optical fiber quartz block bonding structure a according to an embodiment.
In the optical fiber and quartz block joining structure a according to the embodiment, the optical fiber 11 is joined to the curved surface 24a of the top portion of the rear end side portion of the quartz block 24, and the tip end of the optical fiber 11 is positioned inside the quartz block 24.
In the optical connector structure C having the above-described structure, if the laser light starts to be output from the light source, the laser light incident through the quartz block 24 is mainly incident on the core 11a of the optical fiber 11 and transmitted on the incident end side. However, in the optical connector 20 on the incident end side, there are cases where: the laser light that is not incident into the optical fiber 11 due to the misalignment of the axis or the like among the laser light output from the light source is transmitted in the quartz block 24, and reaches the rear end side portion of the quartz block 24. Similarly, in the optical connector 20 on the output end side, there are cases where: the reflected light from the laser irradiation object is incident into the quartz block 24 and transmitted, and reaches the rear end side portion of the quartz block 24. The cladding mode light incident on the cladding 11b of the optical fiber 11 is repeatedly reflected and transmitted at the interface between the cladding 11b and the air, and is removed from the optical fiber 11 by the mode stripper 13.
According to the optical fiber and quartz block joining structure a according to the embodiment, the optical fiber 11 is joined to the curved surface 24a of the quartz block 24 bulging toward the optical fiber 11 side, and the tip of the optical fiber 11 is located inside the quartz block 24. Therefore, as shown in fig. 4A, the laser light L emitted toward the space through the vicinity of the joint portion of the optical fiber 11 and the quartz block 24 is refracted at the curved surface 24A of the quartz block 24 to be prevented from being transmitted in the direction along the optical fiber 11, and the laser light L is enlarged due to the lens effect of the curved surface 24A of the quartz block 24, and the power density is reduced. As a result, damage to the optical fiber case 12 or the optical connector 20 of the optical fiber core 10 can be reduced. In contrast, for example, as shown in fig. 4B, in the case where the optical fiber and quartz block joint structure is such that the optical fiber 11 ' is joined to the rear plane 24a ' of the quartz block 24 ', the laser light L ' emitted toward the space through the vicinity of the joint portion of the optical fiber 11 ' and the quartz block 24 ' is linearly transmitted in the direction along the optical fiber 11 without being refracted at the plane 24a ' of the quartz block 24, and the optical fiber sheath 12 ' or the like of the optical fiber core 10 ' may absorb light and generate heat to be damaged.
Here, as shown in fig. 3, when the radius of the cross section of the optical fiber 11 is R0 in the coordinate system with the axis of the optical fiber 11 as the z-axis, the curved surface 24a of the quartz block 24 can be approximately represented by a rotational ellipsoid represented by the following expression (1) or a hyperboloid represented by the following expression (2). When the measured data of the curved surface 24a is approximated by the least squares method in the range of-2R 0. ltoreq. x.ltoreq.2R 0 and-2R 0. ltoreq. y.ltoreq.2R 0 by using these equations, and constants (a, b, C, R1) are set, the determination coefficient R2 is preferably 0.95 or more. The determination coefficient R2 is a value indicating the degree of fitting between the approximation curve (regression curve) and the measured data, and means: the closer the value is to 1, the higher the degree of fit. In addition, R0 is generally 50 to 1500 μm, for example, and in the case of processing with a laser, R0 is 300 to 750 μm, for example. Preferably R1/R0 is 100 or less, more preferably R1/R0 is 60 or less.
x2+y2-z2+C＝R1 2...(2)
Wherein a, b, C, R1 are constants.
In the joint portion between the optical fiber 11 and the quartz block 24, when the curved surface 24a of the quartz block 24 is approximated by the above equation (1) or (2) by the determination coefficient R2 of 0.95 or more, R1 can be appropriately set according to the radius R0 of the optical fiber 11 and the amount of the optical fiber 11 pushed into the curved surface 24a described later. For example, when the radius R0 of the optical fiber is 500 μm, from the viewpoint of reducing the deformation of the optical fiber 11 due to the amount of pushing the optical fiber 11 into the curved surface 24a, R1 is preferably 500 μm or more, and more preferably R1 is 1500 μm or more. From the viewpoint of suppressing the decrease in the beam deflecting effect or the beam expanding effect caused by the curved surface 24a approaching the plane, R1 is preferably 5000 μm or less, and R1 is more preferably 3000 μm or less. The focal length of light when the curved surface 24a is a lens is determined by R1. In the case where the focal distance is long, the probability of light passing through the gap between the optical fiber support member 23 and the optical fiber 11 arranged behind the quartz block 24 is increased. Therefore, it is preferable to set R1 in consideration of the above conditions. When the curved surface 24a is a spherical surface, R1 is the radius of the sphere as shown in fig. 5.
As shown in fig. 5, a curved surface 25 is formed between the curved surface 24a of the quartz block 24 and the outer peripheral surface of the optical fiber 11 so as to be recessed inward by the surface tension, and in this case, the curvature radius of the recessed curved surface 25 in side view is R2, preferably R2 is 30 μm or more, and more preferably R2 is 80 μm or more. Furthermore, R2 is preferably 1500 μm or less, and R2 is more preferably 750 μm or less. Preferably, R2/R0 is 0.1 or more, and more preferably R2/R0 is 0.25 or more. Further, R2/R0 is preferably 2 or less, and R2/R0 is more preferably 1 or less.
When the curved surface 24a of the quartz block 24 is approximated by the above formula (1) or the above formula (2) with a coefficient of determination R2 of 0.95 or more and the curved surface 25 recessed inside is formed between the curved surface 24a of the quartz block 24 and the outer peripheral surface of the optical fiber 11, R2/R1 is preferably 0.01 or more, and R2/R1 is more preferably 0.02 or more. Further, R2/R1 is preferably 1 or less, and R2/R1 is more preferably 0.5 or less.
The tip of the optical fiber 11 is pushed into the quartz block 24, and the tip is located inside the quartz block 24. As shown in fig. 6A, the length from the rear end of the curved surface 24a of the quartz block 24 to the front end of the optical fiber 11, i.e., the minimum intrusion amount of the optical fiber 11 corresponds to a state where the entire front end surface of the optical fiber 11 abuts on the quartz block 24. When the optical fiber is further pushed in as shown in FIG. 6B, the pushed-in amount of the optical fiber 11 from the rear end of the curved surface 24a of the quartz block 24 is preferably 10 μm or more, more preferably 50 μm or more. From the viewpoint of suppressing the influence of the deformation of the optical fiber 11 squeezed into the quartz block 24 on the transmission characteristics of the laser light, the squeezing amount of the optical fiber 11 is preferably 500 μm or less, and more preferably 100 μm or less. The tip position of the optical fiber 11 is a tip position of the core 11a that can be observed with the naked eye when viewing the quartz block 24 from the side.
The optical fiber quartz block bonding structure a according to the embodiment having the above-described configuration is obtained by: as shown in fig. 7A, the axes of the optical fiber 11 and the quartz block 24 are made coincident; as shown in fig. 7B, the optical fiber 11 is brought close to the curved surface 24a of the quartz block 24; as shown in fig. 7C, the curved surface 24a portion of the quartz block 24 or the front end portion of the optical fiber 11 and the curved surface 24a portion of the quartz block 24 are heated to be melted; thereafter, as shown in fig. 7D, the front end face of the optical fiber 11 is pushed against the top of the curved surface 24a of the quartz block 24, and as shown in fig. 7E, the optical fiber 11 is pushed into the inside of the quartz block 24.
Here, as shown in fig. 8, before the optical fiber 11 is joined to the quartz block 24, a flat surface 24 a' of a predetermined joint portion of the quartz block 24 to be joined to the optical fiber 11 may be heated and melted, thereby forming a curved surface 24a by its surface tension. If the curved surface 24a of the quartz block 24 is formed by heating and melting the flat surface 24 a' of the portion to be bonded to the optical fiber 11, the curved surface 24a having a smooth surface and less defects can be obtained, and the effect of evaporating impurities by heating can be obtained without mixing impurities such as a grinding material as in the case of forming the curved surface 24a by grinding. As a result, the reliability is high and the connection loss can be reduced. The curved surface 24a of the quartz block 24 can be formed by machining such as grinding or polishing.
In this case, from the viewpoint of forming the curved surface 24a of the quartz block 24 and joining the optical fiber 11 to the curved surface 24a through a series of steps, it is preferable that the flat surface 24a 'of the joint portion to be joined to the optical fiber 11 is heated to change the flat surface 24 a' to the curved surface 24a, and then the optical fiber 11 is joined to the curved surface 24a of the quartz block 24.
Industrial applicability-
The present invention is useful in the field of optical fiber quartz block joint structures and methods for manufacturing the same.
Claims (9)
1. An optical fiber quartz block joint structure for laser processing, which is formed by jointing an optical fiber and a quartz block, is characterized in that:
the optical fiber is joined to a curved surface of the quartz block which is bulged toward the optical fiber side and is formed to protrude outward in the axial direction, and a leading end of the optical fiber is located inside the quartz block,
laser light emitted from the quartz block through the curved surface of the quartz block in the vicinity of a joint portion between the optical fiber and the quartz block is refracted at the curved surface,
in a coordinate system with the axis of the optical fiber as the z-axis, assuming that the radius of the cross section of the optical fiber is R0, in the range of-2R 0 ≤ x ≤ 2R0 and-2R 0 ≤ y ≤ 2R0, the least square method approximation is performed on the curved surface of the quartz block by a rotational ellipsoid represented by the following formula (1) or a hyperbolic surface represented by the following formula (2), and the determination coefficient at this time is 0.95 or more,
x2+y2-z2+C＝R1 2…(2)
wherein a, b, C, R1 are constants.
2. The fiber optic quartz block joint construction of claim 1, wherein:
R1/R0 is less than 100.
3. The fiber optic quartz block joint construction of claim 1, wherein:
a curved surface sunk into the inner side is formed between the curved surface of the quartz block and the outer peripheral surface of the optical fiber, and when the curvature radius of the sunk curved surface is R2 in a side view, the R2/R0 is 0.1-2.
4. The fiber optic quartz block joint construction of claim 3, wherein:
R2/R1 is 0.01 to 1.
5. The fiber optic quartz block joint construction of claim 1, wherein:
a curved surface sunk into the inner side is formed between the curved surface of the quartz block and the outer peripheral surface of the optical fiber, and when the radius of the cross section of the optical fiber is R0 and the curvature radius of the sunk curved surface is R2 in a side view, R2/R0 is 0.1-2.
6. The fiber optic quartz block joint construction of claim 1, wherein:
the length from the rear end of the curved surface of the quartz block to the front end of the optical fiber is 10-500 μm.
7. A method for manufacturing an optical fiber quartz block joint structure for laser processing, the optical fiber quartz block joint structure being formed by jointing an optical fiber and a quartz block, characterized in that:
engaging the optical fiber with a curved surface of the quartz block formed by bulging and projecting outward in the axial direction, and having the leading end of the optical fiber located inside the quartz block,
laser light emitted from the quartz block through the curved surface of the quartz block in the vicinity of a joint portion between the optical fiber and the quartz block is refracted at the curved surface,
in a coordinate system with the axis of the optical fiber as the z-axis, assuming that the radius of the cross section of the optical fiber is R0, in the range of-2R 0 ≤ x ≤ 2R0 and-2R 0 ≤ y ≤ 2R0, the least square method approximation is performed on the curved surface of the quartz block by a rotational ellipsoid represented by the following formula (1) or a hyperbolic surface represented by the following formula (2), and the determination coefficient at this time is 0.95 or more,
x2+y2-z2+C＝R1 2…(2)
wherein a, b, C, R1 are constants.
8. The method of manufacturing an optical fiber quartz block joint construction according to claim 7, wherein:
before the optical fiber is joined to the quartz block, a flat surface of a predetermined joint portion of the quartz block to be joined to the optical fiber is heated to form the flat surface into a curved surface.
9. The method of manufacturing an optical fiber quartz block joint construction according to claim 8, characterized in that:
heating a flat surface of a predetermined joint portion to be joined to the optical fiber to change the flat surface into a curved surface, and then joining the optical fiber to the curved surface of the quartz block.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016080069A JP6765210B2 (en) | 2016-04-13 | 2016-04-13 | Optical fiber / quartz block bonding structure and its manufacturing method |
| JP2016-080069 | 2016-04-13 |
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| CN107290829A CN107290829A (en) | 2017-10-24 |
| CN107290829B true CN107290829B (en) | 2020-10-30 |
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| JP6788695B2 (en) | 2019-02-05 | 2020-11-25 | 株式会社フジクラ | Structures, method of manufacturing structures, laser equipment, and laser systems |
| JP6788696B2 (en) * | 2019-02-05 | 2020-11-25 | 株式会社フジクラ | Production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202693842U (en) * | 2012-03-21 | 2013-01-23 | 武汉楚星光纤应用技术有限公司 | Double-curvature lensed fiber |
| JP2014191276A (en) * | 2013-03-28 | 2014-10-06 | Sumitomo Electric Ind Ltd | Laser transmission fiber and manufacturing method therefor |
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| US4962988A (en) * | 1989-07-10 | 1990-10-16 | Optomec Design Company | Termination interface structure and method for joining an optical fiber to a graded index rod lens |
| JP2005241822A (en) * | 2004-02-25 | 2005-09-08 | Fujikura Ltd | Fused optical part, fused optical part manufacturing method, and fused optical part manufacturing device |
| JP2007065437A (en) * | 2005-09-01 | 2007-03-15 | Juki Corp | Fiber collimator |
| JP4620626B2 (en) * | 2006-04-05 | 2011-01-26 | 三菱電線工業株式会社 | Optical fiber structure and block chip used therefor |
| CN102902030B (en) * | 2011-07-29 | 2013-12-25 | 山西飞虹激光科技有限公司 | Energy transfer optical cable for high-power laser transmission |
| CN203480079U (en) * | 2013-09-27 | 2014-03-12 | 武汉锐科光纤激光器技术有限责任公司 | End cap structure for reducing the entering of feedback light into optical fiber |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202693842U (en) * | 2012-03-21 | 2013-01-23 | 武汉楚星光纤应用技术有限公司 | Double-curvature lensed fiber |
| JP2014191276A (en) * | 2013-03-28 | 2014-10-06 | Sumitomo Electric Ind Ltd | Laser transmission fiber and manufacturing method therefor |
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| JP2017191194A (en) | 2017-10-19 |
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