Optical fiber melting point packaging structure and optical fiber laser

Abstract

The utility model provides an optical fiber melting point packaging structure and an optical fiber laser, the optical fiber melting point packaging structure comprises a substrate and a cover plate, the substrate is provided with a first groove, the cover plate covers the substrate and is detachably connected with the substrate, a cavity is formed between the first groove and the cover plate, and the cavity is used for accommodating a welding part of a first optical fiber and a second optical fiber. According to the arrangement, the welding part of the first optical fiber and the second optical fiber is accommodated in the cavity and is not coated, so that leaked light only exists in the optical fiber cladding, the optical fiber cladding is made of silicon dioxide, the melting point of the silicon dioxide is 1713 DEG C and cannot reach the melting point of the optical fiber cladding, and the damage to the welding part of the optical fiber is avoided; in addition, the welding part is accommodated in the cavity, so that external pollutants are prevented from being attached to the optical fiber cladding, and the normal transmission performance of the optical fiber is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber lasers, and in particular to an optical fiber melting point packaging structure and an optical fiber laser. Background Art

[0002] Fiber lasers are typically composed of multiple passive optical components and a pump source. Each component is connected via fiber fusion splices, making the fiber fusion point the weakest part of the system. The quality of the fusion point determines the stability and lifespan of the fiber laser.

[0003] In the existing technology, optical fiber melting point packaging usually uses a quartz tube to be placed in the exposed optical fiber area, and then filled with UV glue for curing to form a heavy coating protective layer. This technology also has the following shortcomings: due to the easy introduction of contamination during the melting point treatment process, light leakage occurs, which is absorbed by the heavy coating UV glue, causing heat and even burning the optical fiber. Utility Model Content

[0004] The first aspect of the present invention provides an optical fiber melting point packaging structure, which is used to solve the technical problem that in the prior art, a quartz tube is used to be placed in the exposed optical fiber area, and then filled with UV glue for curing to form a heavy coating protective layer. Due to the process of processing the melting point, contamination is easily introduced, resulting in light leakage, which is absorbed by the heavy coating UV glue, causing heat and even burning the optical fiber.

[0005] The utility model provides a fiber optic melting point packaging structure, including a substrate and a cover plate, wherein the substrate is provided with a first groove, the cover plate is covered on the substrate and is detachably connected to the substrate, and a cavity is formed between the first groove and the cover plate, and the cavity is used to accommodate the fusion joint of the first optical fiber and the second optical fiber. In this arrangement, the fusion joint of the first optical fiber and the second optical fiber is accommodated in the cavity, and the fusion joint is not coated, so that the leaked light only exists in the optical fiber cladding. The material of the optical fiber cladding is silica, and the melting point of silica is 1713°C, but it is impossible to reach the melting point of the optical fiber cladding, thereby avoiding damage to the optical fiber fusion joint; in addition, the fusion joint is accommodated in the cavity, which prevents external contaminants from adhering to the optical fiber cladding, thereby ensuring the normal transmission performance of the optical fiber.

[0006] Optionally, the fusion-splicing portion of the first optical fiber includes a first coating segment and a first cladding segment connected to each other. If the first coating segment and the first cladding segment are accommodated in the cavity, the outer wall surface of the first coating segment can abut the inner wall surface of the first groove and the surface of the cover plate, respectively. Furthermore, the fusion-splicing portion of the second optical fiber includes a second coating segment and a second cladding segment connected to each other. The outer end surface of the second cladding segment is fused to the outer end surface of the first cladding segment. If the second coating segment and the second cladding segment are accommodated in the cavity, the outer wall surface of the second coating segment can abut the inner wall surface of the first groove and the surface of the cover plate. With this arrangement, in the first groove, the first coating segment of the first optical fiber and the first coating segment of the second optical fiber cooperate with the inner wall surface of the first groove and abut against the lower surface of the cover plate, thereby restricting movement of the fusion-splicing portion of the first optical fiber and the fusion-splicing portion of the second optical fiber.

[0007] Optionally, the first groove is a U-shaped groove, or the first groove is a V-shaped groove.

[0008] Optionally, the substrate is made of metal; such a configuration facilitates the heat dissipation of the optical fiber through the substrate, thereby avoiding the accumulation of heat that affects the transmission characteristics of the optical signal in the optical fiber; and avoiding the aging of the optical fiber cladding due to long-term high temperature.

[0009] Optionally, the cover is made of a transparent and high-temperature resistant material. This arrangement facilitates the observation of the optical fiber melting point temperature during testing, and allows the PD detector to promptly detect and resolve any abnormalities in the optical fiber melting point during operation, thereby reducing losses.

[0010] Optionally, the bottom wall surface of the U-shaped groove is a plane or a curved surface.

[0011] Optionally, the transparent and high-temperature resistant material is glass.

[0012] A second aspect of the present invention provides a fiber laser, comprising a first optical fiber, a second optical fiber, and the above-mentioned optical fiber melting point packaging structure, wherein the fusion-joined portion of the first optical fiber comprises a first coating segment and a first cladding segment connected to each other, and the fusion-joined portion of the second optical fiber comprises a second coating segment and a second cladding segment connected to each other, the outer end face of the first cladding segment being fused to the outer end face of the second cladding segment, the first coating segment, the first cladding segment, the second coating segment, and the second cladding segment being accommodated in the cavity formed by the substrate and the cover plate; the first optical fiber and the second optical fiber both extend out of the cavity. Thus configured, in a fiber laser having this fiber melting point packaging structure, the fusion splice of the first and second optical fibers is contained within a cavity, and the first and second cladding segments of the fusion splice are not coated, so that leaked light exists only in the fiber cladding. The fiber cladding is made of silica, which has a melting point of 1713°C, but cannot reach the melting point of the fiber cladding, thereby avoiding damage to the fiber fusion splice and extending the life of the fiber laser. Furthermore, the fusion splice is contained within the cavity, preventing external contaminants from adhering to the fiber cladding, thereby ensuring normal transmission performance of the fiber laser.

[0013] Optionally, the fiber laser further comprises a bottom plate, and one end of the first optical fiber away from the first cladding segment extends out of the cavity and is spirally arranged on the bottom plate.

[0014] Optionally, the bottom plate is a disc structure, and the base plate is tangent to the bottom plate.

[0015] Optionally, a connecting plate is connected to the center of the base plate, the connecting plate is a disc structure, and the first optical fiber is located on the outside of the connecting plate along the radial direction.

[0016] Optionally, the bottom plate is provided with a limiting portion, and the limiting portion is used to limit the first optical fiber to be spirally arranged on the bottom plate. Such a setting is used to limit the position of the first optical fiber.

[0017] Optionally, the limiting portion is a second groove, and the second groove is arranged in a spiral shape; the first optical fiber is arranged in the second groove.

[0018] Optionally, the spacing between adjacent second grooves on the outside is greater than the spacing between adjacent second grooves on the inside. This arrangement reduces the temperature of adjacent first optical fibers on the outside, avoids cross-heat accumulation, and prevents large-area fiber burns, thereby reducing losses in the fiber laser.

[0019] Optionally, the fiber laser further includes a first grating, a beam combiner assembly, and a second grating sequentially arranged along the transmission direction of the laser signal, the input end of the first grating is connected to the end of the first optical fiber away from the fusion portion, the beam combiner assembly includes a beam combiner and a pump source, the second optical fiber is connected to the input end of the beam combiner, and the pump source is connected to the pump input end of the beam combiner, wherein the pump signal direction of the pump source is opposite to the transmission direction of the laser signal, and the reflectivity of the first grating is greater than the reflectivity of the second grating. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A partially enlarged top view of a fiber optic melting point packaging structure provided by an embodiment of the present utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the BB cross-section structure;

[0022] Figure 3 for Figure 2 Schematic diagram of the CC cross-section structure;

[0023] Figure 4 A schematic structural diagram of a first optical fiber in a fiber laser provided in an embodiment of the present utility model;

[0024] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure enlarged by DD;

[0025] Figure 6 This is a structural diagram of a fiber laser provided in an embodiment of the utility model.

[0026] Description of reference numerals:

[0027] 10. Substrate; 110. First groove; 20. Cover plate; 30. First optical fiber; 310. First coating section; 320. First cladding section; 330. Coiled optical fiber section; 340. Straight optical fiber section; 40. Second optical fiber; 410. Second coating section; 420. Second cladding section; 50. Bottom plate; 510. Connecting plate; 511. Second groove; 60. First grating; 70. Combiner assembly; 710. Combiner; 720. Pump source; 80. Second grating; L1 - Spacing between adjacent second grooves located on the outside; L2 - Spacing between adjacent second grooves located on the inside. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purpose, features and advantages of the present invention more obvious and easy to understand, the following is a brief description of the present invention in conjunction with the attached Figure 1 —6 The specific embodiments of the present invention are described in detail.

[0029] In the present invention, the terms "connection" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated structure.

[0030] In the present invention, the terms "inside", "outside", "upper" and "lower" and so on indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0031] The present invention provides a fiber optic melting point packaging structure. Figure 1 - Figure 3 and Figure 6 The optical fiber melting point packaging structure includes a substrate 10 and a cover plate 20. The substrate 10 is provided with a first groove 110. The cover plate 20 covers the substrate 10 and is detachably connected to the substrate 10. A cavity is formed between the first groove 110 and the cover plate 20. The cavity is used to accommodate the fusion splice A between the first optical fiber 30 and the second optical fiber 40. This arrangement accommodates the fusion splice A between the first optical fiber 30 and the second optical fiber 40 within the cavity. The fusion splice A is not coated, so that leaked light only exists in the optical fiber cladding. The optical fiber cladding is made of silica, which has a melting point of 1713°C, but cannot reach the melting point of the optical fiber cladding. This prevents damage to the optical fiber fusion splice A. Furthermore, the fusion splice A is housed within the cavity, preventing external contaminants from adhering to the optical fiber cladding, thereby ensuring the normal transmission performance of the optical fiber.

[0032] In the embodiment of the present invention, the cover plate 20 is connected to the base plate 10 via fasteners, wherein the fasteners may be screws or bolts.

[0033] See attached Figure 3 and Figure 6In an embodiment of the present invention, the fusion splice portion A of the first optical fiber 30 includes a first coating segment 310 and a first cladding segment 320 that are connected to each other. If the first coating segment 310 and the first cladding segment 320 are accommodated in a cavity, the outer wall surface of the first coating segment 310 can respectively abut the inner wall surface of the first groove 110 and the surface of the cover plate 20; and the fusion splice portion A of the second optical fiber 40 includes a second coating segment 410 and a second cladding segment 420 that are connected to each other. The outer end surface of the second cladding segment 420 is fused to the outer end surface of the first cladding segment. If the second coating segment 410 and the second cladding segment 420 are accommodated in a cavity, the outer wall surface of the second coating segment 410 can abut the inner wall surface of the first groove 110 and the surface of the cover plate 20. In this arrangement, the first groove 110, the first coating section 310 of the first optical fiber 30, and the first coating section 410 of the second optical fiber 40 cooperate with the inner wall surface of the first groove 110 and abut against the lower surface of the cover plate 20, thereby limiting the movement of the fusion splicing portion A of the first optical fiber 30 and the fusion splicing portion A of the second optical fiber 40.

[0034] In the embodiment of the present utility model, the shape of the first groove 110 is not limited, and is specifically as follows: In one embodiment, the first groove 110 is a V-shaped groove; Figure 2 In another embodiment, the first groove 110 is a U-shaped groove.

[0035] In this embodiment of the present invention, the substrate 10 is made of metal. This configuration facilitates heat dissipation from the optical fiber through the substrate 10, preventing heat accumulation from affecting the transmission characteristics of the optical signal in the optical fiber and preventing aging of the optical fiber cladding due to prolonged high temperature.

[0036] In the embodiment of the present invention, the cover plate 20 is made of a transparent and high-temperature resistant material. This configuration facilitates the observation of the optical fiber melting point temperature during testing, and allows the PD detector to promptly detect and resolve any abnormalities in the optical fiber melting point during operation, thereby reducing losses.

[0037] See attached Figure 3 and Figure 6 In this embodiment of the present invention, the first groove 110 is a straight groove. In this configuration, the fusion portion A between the first optical fiber 30 and the fourth optical fiber 40 is a straight segment, which can avoid the temperature rise caused by the bending loss of the first optical fiber 30.

[0038] In the embodiment of the present invention, the shape of the bottom wall of the U-shaped groove is not limited, and is specifically as follows:

[0039] In one embodiment, the bottom wall of the U-shaped groove is a plane.

[0040] In another embodiment, the bottom wall of the U-shaped groove is an arc surface, which increases the contact area between the arc surface of the U-shaped groove and the first coating section 310 and the second coating section 410, thereby achieving better heat dissipation.

[0041] In the embodiment of the present utility model, the transparent and high temperature resistant material is glass.

[0042] See attached Figure 4 and Figure 6 According to a second aspect of the present invention, a fiber laser is provided, comprising a first optical fiber 30, a second optical fiber 40, and the above-mentioned optical fiber melting point packaging structure. The fusion joint A of the first optical fiber 30 comprises a first coating segment 310 and a first cladding segment 320 connected to each other. The fusion joint A of the second optical fiber 40 comprises a second coating segment 410 and a second cladding segment 420 connected to each other. The outer end face of the first cladding segment 320 is fused to the outer end face of the second cladding segment 420. The first coating segment 310, the first cladding segment 320, the second coating segment 410, and the second cladding segment 420 are accommodated in a cavity formed by a substrate 10 and a cover plate 20. The first optical fiber 30 and the second optical fiber 40 both extend out of the cavity. Thus configured, in a fiber laser having this fiber melting point packaging structure, the fusion splice A of the first optical fiber 30 and the second optical fiber 40 is accommodated in a cavity, and the first cladding segment 320 and the second cladding segment 420 of the fusion splice A are not coated, so that leaked light exists only in the fiber cladding. The fiber cladding is made of silica, and the melting point of silica is 1713°C, which is unlikely to reach the melting point of the fiber cladding. This avoids damage to the fiber fusion splice A, thereby extending the life of the fiber laser. In addition, the fusion splice A is accommodated in the cavity, which prevents external contaminants from adhering to the fiber cladding, thereby ensuring the normal transmission performance of the fiber laser.

[0043] It should be noted that the first optical fiber 30 includes a third coating segment, which is connected to the first coating segment 310 and extends out of the cavity; the second optical fiber 40 includes a fourth coating segment, which is connected to the second coating segment 410 and extends out of the cavity.

[0044] In the embodiment of the present invention, the fiber laser further includes a bottom plate 50 , the substrate 10 is connected to the bottom plate 50 , and one end of the first optical fiber 30 away from the first cladding segment 320 extends out of the cavity and is spirally disposed on the bottom plate 50 .

[0045] It should be noted that the first optical fiber 30 includes a third coating segment connected to the first coating segment 310. The third coating segment extends out of the cavity and is spirally disposed on the base plate 50. The third coating segment includes a coiled optical fiber segment 330 and a straight optical fiber segment 340 that are connected to each other. The first coating segment 310 is connected to the straight optical fiber segment 340.

[0046] In the embodiment of the present invention, the bottom plate 50 is a disc structure, and the substrate 10 is tangent to the bottom plate 50 .

[0047] In the embodiment of the present invention, the base plate 10 and the bottom plate 50 are an integral structure or a separate structure.

[0048] In the embodiment of the present invention, a connecting plate 510 is connected to the center of the base plate 50. The connecting plate 510 is a disc structure, and the first optical fiber 30 is located radially outside the connecting plate 510. Such a configuration of the connecting plate 510 facilitates the operator to wind the first optical fiber 30 around the base plate 50.

[0049] In the embodiment of the present invention, the bottom plate 510 is provided with a limiting portion, which is used to limit the first optical fiber 30 to be spirally arranged on the bottom plate 510. This arrangement is used to limit the position of the first optical fiber 30.

[0050] See attached Figure 5 In one embodiment of the present invention, the limiting portion may be a second groove 511 , and the second groove 511 is spirally arranged; the first optical fiber 30 is arranged in the second groove 511 .

[0051] In another embodiment of the present invention, the limiting portion may also be a protrusion, and there are multiple protrusions arranged in a spiral shape. The space formed by the multiple protrusions is used to accommodate the first optical fiber 30.

[0052] See attached Figure 5 In this embodiment of the present invention, the spacing L1 between adjacent second grooves 511 on the outside is greater than the spacing L2 between adjacent second grooves 511 on the inside. This arrangement reduces the temperature of the adjacent first optical fibers 30 on the outside, prevents cross-heat accumulation, and prevents large-area fiber burns, thereby reducing fiber laser losses.

[0053] In the embodiment of the present invention, the ratio of the spacing between adjacent second grooves 511 on the outer side to the spacing between adjacent second grooves 511 on the inner side is between 1.5 and 2.5. Preferably, the ratio of the spacing between adjacent second grooves 511 on the outer side to the spacing between adjacent second grooves 511 on the inner side is 2.

[0054] See attached Figure 6In an embodiment of the present invention, the fiber laser further includes a first grating 60, a combiner assembly 70, and a second grating 80, which are sequentially arranged along the transmission direction of the laser signal. The input end of the first grating 60 is connected to the end of the first optical fiber 30 away from the fusion portion A. The combiner assembly 70 includes a combiner 710 and a pump source 720. The second optical fiber 40 is connected to the input end of the combiner 710, and the pump source 720 is connected to the pump input end of the combiner 710. The pump signal direction of the pump source 720 is opposite to the transmission direction of the laser signal, and the reflectivity of the first grating 60 is greater than the reflectivity of the second grating 80.

[0055] In the embodiment of the present invention, the reflectivity of the first grating 60 is greater than or equal to 99%.

[0056] In the embodiment of the present invention, the reflectivity of the second grating 80 is between 5% and 20%.

[0057] Although the present invention is disclosed as above, it is not limited thereto. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope defined by the claims.

Claims

1. An optical fiber melting point packaging structure, characterized in that: The invention comprises a base plate (10) and a cover plate (20), wherein the base plate (10) is provided with a first groove (110), the cover plate (20) covers the base plate (10) and is detachably connected to the base plate (10), and a cavity is formed between the first groove (110) and the cover plate (20), and the cavity is used to accommodate a fusion splice portion (A) of a first optical fiber (30) and a second optical fiber (40).

2. The optical fiber melting point packaging structure according to claim 1, characterized in that: The fusion splice portion (A) of the first optical fiber (30) comprises a first coating section (310) and a first cladding section (320) connected to each other, and if the first coating section (310) and the first cladding section (320) are accommodated in the cavity, the outer wall surface of the first coating section (310) can respectively abut against the inner wall surface of the first groove (110) and the surface of the cover plate (20); and The fusion splice portion (A) of the second optical fiber (40) comprises a second coating segment (410) and a second cladding segment (420) connected to each other, the outer end face of the second cladding segment (420) being fused to the outer end face of the first cladding segment (320), and if the second coating segment (410) and the second cladding segment (420) are accommodated in the cavity, the outer wall surface of the second coating segment (410) can respectively abut against the inner wall surface of the first groove (110) and the surface of the cover plate (20).

3. The optical fiber melting point packaging structure according to claim 1, characterized in that: The first groove (110) is a U-shaped groove, or the first groove (110) is a V-shaped groove; And / or, the substrate (10) is made of metal; And / or, the cover plate (20) is made of a transparent and high-temperature resistant material; And / or, the first groove (110) is a linear groove.

4. The optical fiber melting point packaging structure according to claim 3, characterized in that: The bottom wall surface of the U-shaped groove is a plane or a curved surface; and / or the transparent and high-temperature resistant material is glass.

5. A fiber laser, characterized in that: The invention comprises a first optical fiber (30), a second optical fiber (40) and an optical fiber melting point packaging structure according to any one of claims 1 to 4, wherein the fusion splicing portion (A) of the first optical fiber (30) comprises a first coating segment (310) and a first cladding segment (320) connected to each other, the fusion splicing portion (A) of the second optical fiber (40) comprises a second coating segment (410) and a second cladding segment (420) connected to each other, the outer end face of the first cladding segment (320) is fused to the outer end face of the second cladding segment (420), the first coating segment (310), the first cladding segment (320), the second coating segment (410) and the second cladding segment (420) are accommodated in the cavity formed by the substrate (10) and the cover plate (20); the first optical fiber (30) and the second optical fiber (40) both extend out of the cavity.

6. The fiber laser according to claim 5, characterized in that The fiber laser further comprises a bottom plate (50), the substrate (10) is connected to the bottom plate (50), and one end of the first optical fiber (30) away from the first cladding segment (320) extends out of the cavity and is spirally arranged on the bottom plate (50).

7. The fiber laser according to claim 6, characterized in that The bottom plate (50) is a disc structure, and the substrate (10) is tangent to the bottom plate (50); And / or, a connecting plate (510) is connected to the center of the bottom plate (50), the connecting plate (510) is a disc structure, and the first optical fiber (30) is located outside the connecting plate (510) in a radial direction; And / or, the bottom plate (50) is provided with a limiting portion, and the limiting portion is used to limit the first optical fiber (30) to be arranged in a spiral shape on the bottom plate (50).

8. The fiber laser according to claim 7, characterized in that The limiting portion is a second groove (511), and the second groove (511) is arranged in a spiral shape; the first optical fiber (30) is arranged in the second groove (511).

9. The fiber laser according to claim 8, characterized in that The spacing between adjacent second grooves (511) located on the outer side is greater than the spacing between adjacent second grooves (511) located on the inner side.

10. The fiber laser according to claim 5, characterized in that The fiber laser further comprises a first grating (60), a beam combiner assembly (70), and a second grating (80) sequentially arranged along the transmission direction of the laser signal, wherein the input end of the first grating (60) is connected to an end of the first optical fiber away from the fusion portion (A), the beam combiner assembly (70) comprises a beam combiner (710) and a pump source (720), the second optical fiber (40) is connected to the input end of the beam combiner (710), and the pump source (720) is connected to the pump input end of the beam combiner (710), wherein the pump signal direction of the pump source (720) is opposite to the transmission direction of the laser signal, and the reflectivity of the first grating (60) is greater than the reflectivity of the second grating (80).

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