Optical fiber device and optical fiber laser
By designing the grating fiber, mode field adapter and fiber combiner in the fiber optic device, and adopting the tapered structure and fusion section, the problems of low production efficiency and high cost of fiber lasers in the existing technology are solved, and more efficient assembly and cost reduction are achieved.
Patent Information
- Application Number
- CN202422851577.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-11-21
AI Technical Summary
Existing mode field adapters, pump combiners and gratings are fused and inserted into the optical path of fiber lasers, resulting in low production efficiency, high cost and poor performance.
A fiber optic device is designed, including a grating fiber, a mode field adapter, and a fiber combiner. By designing a tapered structure and a fusion splice section, the fusion points and fusion losses are reduced, the device is integrated, and the number of fusion splices is reduced.
It improves the production efficiency of fiber lasers, reduces costs and defect risks, and improves assembly time and structural reliability.
Smart Images
Figure CN223334221U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of laser technology, and in particular relates to an optical fiber device and an optical fiber laser. Background Art
[0002] Fiber lasers use rare-earth-doped glass fiber as their gain medium. Mode field adapters, pump combiners, and gratings play crucial roles in fiber lasers. These three components must be separately fused and inserted into the laser's optical path. Fusing these three components into the laser's optical path requires at least four splices, increasing the risk of defective laser paths. The splice points and fiber assembly time are lengthy, resulting in low production efficiency, increased fiber consumption, and high production costs. Utility Model Content
[0003] The embodiments of the present application provide an optical fiber device and an optical fiber laser to solve the problem that the existing mode field adapter, pump combiner and grating are all fused and inserted into the laser light path, resulting in low laser production efficiency, high production cost and poor performance.
[0004] In a first aspect, an embodiment of the present application provides an optical fiber device, comprising:
[0005] Bragg grating optical fiber;
[0006] A mode field adapter, comprising a signal optical fiber and a tapered structure located at the input end of the grating optical fiber, wherein the signal optical fiber is fused to the tapered structure;
[0007] The optical fiber combiner comprises a plurality of pump optical fibers, which are respectively fused with the outer peripheral surface of a section of the grating optical fiber close to the tapered structure.
[0008] Optionally, the cladding diameter of the tapered structure at one end close to the signal optical fiber is D1, and the cladding diameter at the other end is D2, wherein 2D1=D2;
[0009] And / or, along the axial direction of the signal optical fiber, the length of the tapered structure is L, where L=10 mm.
[0010] Optionally, a plurality of pump fibers are symmetrically arranged with the axis of the grating fiber as the center.
[0011] Optionally, the pump fiber has a fusion splice section, the fusion splice section is fused to the outer peripheral surface of the grating fiber, and the cladding diameter of the fusion splice section is smaller than the cladding diameter at other positions.
[0012] Optionally, the welded section is formed by a pre-drawing process.
[0013] Optionally, the fusion section includes a first section and a second section, the first section is closer to the tapered structure than the second section, the first section has a first end and a second end, the first end is farther away from the second section than the second end, the cladding diameter of the first section gradually changes, and the cladding diameter of the first end is larger than the cladding diameter of the second end, and the cladding diameter of the second section is the same as the cladding diameter of the second end.
[0014] Optionally, a packaging plate is further included, and the grating optical fiber, the mode field adapter and the optical fiber combiner are fixed on the packaging plate.
[0015] Optionally, the grating optical fiber, the mode field adapter and the optical fiber combiner are fixed on the packaging board by means of thermally conductive adhesive.
[0016] Optionally, a heat dissipation shell is further included, and the packaging plate is fixed in the heat dissipation shell.
[0017] In a second aspect, an embodiment of the present application further provides a fiber laser, which includes the fiber device as described in any one of the above.
[0018] The optical fiber device and optical fiber laser provided in the embodiments of the present application include a grating optical fiber, a mode field adapter and an optical fiber combiner. The tapered structure of the mode field adapter is arranged at the input end of the grating optical fiber, the signal optical fiber is fused to the tapered structure, and the multiple pump optical fibers of the optical fiber combiner are fused to the outer peripheral surface of a section of the grating optical fiber close to the tapered structure. The grating optical fiber, the mode field adapter and the optical fiber combiner are assembled into an integrated device, which overcomes the problem that the existing mode field adapter, the pump combiner and the grating are all fused and inserted into the laser optical path, resulting in low laser production efficiency, high production cost and poor performance. It can reduce the welding points and welding losses, reduce the number of welding times, reduce the risk of defects, and improve the assembly time of the laser. At the same time, it can reduce the consumption of passive optical fibers of various specifications and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.
[0020] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.
[0021] Figure 1 A schematic diagram of an optical fiber device provided in an embodiment of the present application.
[0022] Figure 2 A schematic diagram of an optical fiber device provided in an embodiment of the present application having a packaging plate.
[0023] Figure 3 A schematic diagram of an optical fiber device provided in an embodiment of the present application having a heat dissipation housing.
[0024] Figure 4 This is a labeled schematic diagram of the optical fiber device provided in an embodiment of the present application. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.
[0026] See also Figure 1 The embodiment of the present application provides an optical fiber device for use in an optical fiber laser. The optical fiber device includes a grating optical fiber 100, a mode field adapter 200, and an optical fiber combiner 300.
[0027] In an embodiment of the present application, a grating fiber 100 is prepared by engraving a grating on an optical fiber using different methods. The grating pitch of the grating fiber 100 can be distributed equidistantly along the length of the optical fiber. The mode field adapter 200 includes a signal fiber 210 and a tapered structure 220 located at the input end of the grating fiber 100, and the signal fiber 210 is fused with the tapered structure 220. The coating of a section of the grating fiber 100 near the input end is removed and a tapered process is performed to form the tapered structure 220. The tapered structure 220 is fused with the signal fiber 210. The mode field adapter 200 can effectively expand the mode field of a single-mode fiber or an LMA fiber. The fiber combiner 300 includes a plurality of pump fibers 310. The plurality of pump fibers 310 are respectively fused with the outer peripheral surface of a section of the grating fiber 100 near the tapered structure 220. The coating layer of a section of the grating fiber 100 close to the tapered structure 220 is removed, and the outer peripheral surfaces of the cladding of the pump fiber 310 and the section of the grating fiber 100 close to the tapered structure 220 are fusion-bonded.
[0028] In the embodiment of the present application, the optical fiber device integrates the grating optical fiber 100, the mode field adapter 200 and the optical fiber combiner 300 into one, reducing the number of fusion points and fusion losses, reducing the number of fusions, reducing the risk of defects, and improving the assembly time of the laser. At the same time, it can reduce the consumption of passive optical fibers of various specifications and reduce costs.
[0029] In some embodiments, see Figure 1 and Figure 4The tapered structure 220 includes a core and a cladding wrapping the core. The tapered structure 220 has one end close to the signal optical fiber 210 and the other end away from the signal optical fiber 210. The cladding diameter at one end close to the signal optical fiber 210 is D1, and the cladding diameter at the other end is D2, wherein 2D1=D2. Exemplarily, the cladding diameter D1 at one end close to the signal optical fiber 210 is 125 μm, and the cladding diameter D at the other end is 250 μm. The coating of a section of the signal optical fiber 210 close to the tapered structure 220 is removed so that the end of the signal optical fiber 210 can be fused with the tapered structure 220. The cladding diameter of the signal optical fiber 210 is 125 μm.
[0030] In some embodiments, see Figure 4 The length of the tapered structure 220 along the axial direction of the signal fiber 210 is L, L = 10 mm. The reasonable length of the tapered structure 220 is conducive to the tapering process of the grating fiber 100 and the preparation of the tapered structure 220 that meets the requirements.
[0031] In some embodiments, see Figure 1 The plurality of pump fibers 310 are symmetrically arranged with the axis of the grating fiber 100 as the center. For example, two pump fibers 310 are arranged symmetrically with the axis of the grating fiber 100 as the center.
[0032] In some embodiments, see Figure 1 The pump fiber 310 has a fusion splice section 320 , which is fused to the outer peripheral surface of the grating fiber 100 . The cladding diameter of the fusion splice section 320 is smaller than the cladding diameters at other positions.
[0033] Exemplarily, the pump fiber 310 comprises a core, a cladding, and a coating, with the cladding surrounding the core and the coating surrounding the cladding. The coating is removed from a section of the pump fiber 310 adjacent to the grating fiber 100. The fiber in the fusion splice section 320 also comprises a core and a cladding. The cladding diameter of the fusion splice section 320 is smaller than that of the cladding at other locations of the pump fiber 310, facilitating side-splicing of the pump fiber 310 and the grating fiber 100.
[0034] In some embodiments, the fusion splice section 320 is formed by pre-drawing. A section of the pump fiber 310 near the grating fiber 100 is pre-drawn and then fused with the grating fiber 100. This is a simple and easy-to-operate process.
[0035] In some embodiments, see Figure 1The fusion splice section 320 includes a first section 321 and a second section 322, and the first section 321 is closer to the tapered structure 220 than the second section 322. The first section 321 has a first end and a second end, and the first end is farther away from the second section 322 than the second end. The cladding diameter of the first section 321 is gradual, and the cladding diameter of the first end is larger than the cladding diameter of the second end. The cladding diameter of the second section 322 is the same as the cladding diameter of the second end. Exemplarily, the cladding diameter of the first end of the first section 321 is 125 μm, the cladding diameter of the second end is 20 μm to 30 μm, and the cladding diameter of the second section 322 is the same as the cladding diameter of the second end. Along the length direction of the grating optical fiber 100, the length of the bonding portion between the fusion splice section 320 and the grating optical fiber 100 is 14 mm.
[0036] In some embodiments, see Figure 2 , further comprising a packaging plate 400, to which the grating fiber 100, mode field adapter 200, and fiber combiner 300 are fixed. The packaging plate 400 is a quartz substrate. The packaging plate 400 is a long rectangular plate. The stripped ends of the pump fiber 310 and the signal fiber 210 are located on the packaging plate 400, near the ends of the packaging plate 400. The gratings of the grating fiber 100 are all located on the packaging plate 400.
[0037] In the embodiment of the present application, the grating optical fiber 100, the mode field adapter and the optical fiber combiner 300 are fixed on the packaging plate 400, which improves the stability and structural reliability of the optical fiber device and facilitates the flow of the optical fiber device between multiple stations.
[0038] In some embodiments, see Figure 2 The grating fiber 100, the mode field adapter 200 and the fiber combiner 300 are fixed to the packaging plate 400 by means of a thermal conductive adhesive 600. The thermal conductive adhesive is UV adhesive. The grating fiber 100, the mode field adapter 200 and the fiber combiner 300 and the packaging plate 400 have multiple adhesive dispensing positions. At the first adhesive dispensing position, the thermal conductive adhesive 600 is applied on the coating of the pump fiber 310 and the signal fiber 210, near the stripped end of the coating of the pump fiber 310 and the stripped end of the coating of the signal fiber 210. At the second adhesive dispensing position, the thermal conductive adhesive 600 is applied on the coating of the grating fiber 100 near the input end. At the third adhesive dispensing position, the thermal conductive adhesive 600 is applied on the coating of the grating fiber 100 on the side facing away from the input end.
[0039] In the embodiment of the present application, the grating fiber 100, the mode field adapter 200 and the fiber combiner 300 are fixed to the packaging plate 400 by thermally conductive adhesive. The fixing method is simple and easy to operate, and the structural strength of the optical fiber device is ensured.
[0040] In some embodiments, see Figure 3, further comprising a heat dissipation housing 500, in which the packaging plate 400 is fixed. The heat dissipation housing 500 is a rectangular housing having a receiving space formed therein. The grating optical fiber 100, the mode field adapter 200, the optical fiber combiner 300, and the packaging plate 400 are all installed in the heat dissipation housing 500. The side of the packaging plate 400 facing away from the grating optical fiber 100 is in contact with the inner wall of the heat dissipation housing 500. The heat dissipation housing 500 is made of a metal material, such as copper or aluminum, which has a fast heat conduction rate and good thermal conductivity.
[0041] See also Figure 1 、 Figure 2 and Figure 3 The present application also provides a fiber laser comprising any of the aforementioned fiber optic devices. The integrated structure of the fiber optic device reduces the number of splice points from four to two, significantly reducing the probability of poor laser performance due to poor splice quality, shortening the optical path assembly time of the fiber laser, improving production efficiency, and reducing fiber costs.
[0042] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0043] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more features.
[0044] The optical fiber device and optical fiber laser provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of the present application. At the same time, for those skilled in the art, according to the idea of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.
Claims
1. An optical fiber device, characterized in that: include: Grating optical fiber (100); A mode field adapter (200) comprises a signal optical fiber (210) and a tapered structure (220) located at the input end of the grating optical fiber (100), wherein the signal optical fiber (210) and the tapered structure (220) are fusion-spliced; The optical fiber combiner (300) includes a plurality of pump optical fibers (310), wherein the plurality of pump optical fibers (310) are respectively fused to the outer peripheral surface of a section of the grating optical fiber (100) close to the tapered structure (220).
2. The optical fiber device according to claim 1, characterized in that The cladding diameter of one end of the tapered structure close to the signal optical fiber (210) is D1, and the cladding diameter of the other end is D2, wherein 2D1=D2; And / or, along the axial direction of the signal optical fiber (210), the length of the tapered structure (220) is L, where L=10 mm.
3. The optical fiber device according to claim 1, wherein: The plurality of pump fibers (310) are symmetrically arranged with the axis of the grating fiber (100) as the center.
4. The optical fiber device according to claim 3, characterized in that The pump fiber (310) has a fusion splice section (320), the fusion splice section (320) is fusion spliced with the outer peripheral surface of the grating fiber (100), and the cladding diameter of the fusion splice section (320) is smaller than the cladding diameters at other positions.
5. The optical fiber device according to claim 4, characterized in that The welding section (320) is formed by a pre-drawing process.
6. The optical fiber device according to claim 5, characterized in that The welding section (320) includes a first section (321) and a second section (322), the first section (321) is closer to the tapered structure (220) than the second section (322), the first section (321) has a first end and a second end, the first end is farther away from the second section (322) than the second end, the cladding diameter of the first section (321) is gradually changed, and the cladding diameter of the first end is larger than the cladding diameter of the second end, and the cladding diameter of the second section (322) is the same as the cladding diameter of the second end.
7. The optical fiber device according to any one of claims 1 to 6, characterized in that: It also includes a packaging plate (400), on which the grating optical fiber (100), the mode field adapter (200) and the optical fiber combiner (300) are fixed.
8. The optical fiber device according to claim 7, characterized in that The grating optical fiber (100), the mode field adapter (200) and the optical fiber combiner (300) are fixed on the packaging plate (400) via a heat-conducting adhesive (600).
9. The optical fiber device according to claim 7, characterized in that It also includes a heat dissipation housing (500), in which the packaging plate (400) is fixed.
10. A fiber laser, characterized in that: include: The optical fiber device according to any one of claims 1 to 9.