An integrated fiber optic coupling device and equipment

Abstract

This application relates to the field of laser technology and provides an integrated fiber coupling device and apparatus. The device includes a beam combining module and a coupling filter module integrated within a housing. The beam combining module polarizes and combines the laser beam, which is then coupled into a fiber combiner via a first fiber and output as a second fiber. The output is then filtered by a cladding filter unit and output through a nozzle. The coupling filter module contains multiple fixed cavities with curved walls. The first fiber at the input end of the fiber combiner and the second fiber at the output end are respectively fixed in curvature by adhering to the corresponding curved walls before output. This device improves beam quality and overall heat dissipation efficiency. The curved wall structure fixes the curvature of the fiber, reducing fiber stress and bending radius, thus solving the problems of excessive bending stress and insecure fiber fixation in existing coupling units, which lead to poor stability and reliability of laser output.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lasers, in particular to an integrated fiber coupling device and equipment. BACKGROUND

[0002] Lasers are widely used in industrial processing, medical and cosmetic treatment, scientific research, communication and national defense due to their high efficiency, small size and long service life. In the prior art, in order to improve the output power of the laser, a common solution is to use beam combining technology to superimpose the outputs of multiple laser units. Since it is difficult to meet the requirements of higher power or specific beam distribution by relying on a single combining method, polarization beam combining (PBC) and fiber coupling technology are the most commonly used technologies to improve the power of lasers. In many fiber coupling systems, in order to further improve the coupling efficiency, various optical lenses (such as spherical lenses, cylindrical lenses, self-focusing lenses, and tapered optical fibers) are usually combined to greatly improve the coupling efficiency. However, in the optical fiber laser transmission system, especially in the high-power operating state, part of the laser energy will inevitably be coupled into the optical fiber cladding to form cladding light. The cladding light reduces the spectral purity and spatial beam quality of the transmission beam, so a cladding light filtering unit (CPS) is provided to filter out the cladding light.

[0003] However, in the prior art, the optical fiber at the fiber combining point and before and after the CPS unit is bent with a radius that is too small (below the safety threshold) due to space limitations, which can easily cause problems such as a dramatic increase in optical loss, accumulation of optical fiber micro-cracks, and an exponential increase in failure rate. The combining point can form a high-temperature hot spot due to energy convergence. The optical fiber is not fixed firmly, and the curvature changes dynamically due to shell vibration / displacement, accelerating fatigue damage, thus not meeting the stability and reliability requirements of the system for the output of the laser. In addition, the combining process itself, especially in a space-limited integrated packaging system, can cause a sharp rise in temperature in the region of high energy concentration. If heat dissipation is not properly managed, it will seriously threaten the service life and beam stability of the device. SUMMARY

[0004] The present application aims to provide an integrated fiber coupling device and equipment to improve the technical problems presented in the background section.

[0005] To achieve the above purpose, the present application provides the following technical solutions:

[0006] The first aspect of the present application provides an integrated fiber coupling device, comprising:

[0007] A packaging shell having a light-emitting unit, a beam combining module and a coupling filtering module integrated inside;

[0008] The beam combining module is used to combine the light beam emitted by the light-emitting unit and couple it into the corresponding first optical fiber, wherein the number of the first optical fibers is at least two.

[0009] The coupling filter module includes a fixed cavity and an optical fiber combiner. The optical fiber combiner includes an input end and a coupling end. Each first optical fiber is connected to the corresponding input end. After multiple first optical fibers are coupled by the optical fiber combiner, they are output as second optical fibers, which are connected to the coupling end.

[0010] The fixed cavity includes multiple arc-shaped walls, which are respectively disposed on the path of the first optical fiber connecting to the input end and the routing path of the second optical fiber.

[0011] Optionally, the fiber combiner is fixed to the bottom of the encapsulation housing, and the fixing cavity further includes:

[0012] The first fixed cavity includes a first arc-shaped wall and a first flat wall. The bottom surface of the first fixed cavity is fixed to the bottom surface of the encapsulation housing and extends to the top surface of the encapsulation housing in a direction perpendicular to the bottom surface of the encapsulation housing. The first fixed cavity is respectively arranged in a one-to-one correspondence with the first optical fiber along the width direction of the encapsulation housing. The arc surfaces of multiple sets of the first arc-shaped walls all protrude toward the beam output direction of the corresponding beam combining module. Any first optical fiber is input to the input end of the optical fiber combiner through the first arc-shaped wall.

[0013] The second fixed cavity includes a second arc-shaped wall and a second planar wall. The bottom surface of the second fixed cavity is fixed to the side wall along the length direction of the encapsulation housing and extends to the opposite side wall in a direction perpendicular to the side wall. The arc surface of the second arc-shaped wall protrudes in the opposite direction to the beam output direction of the beam combining module. The beam output by the fiber beam combiner is transmitted through the second optical fiber, which is wound around the second arc-shaped wall.

[0014] Preferably, the device includes a cladding light filtering unit, through which the cladding light of the second optical fiber is filtered. The cladding light filtering unit is fixed to the top of the encapsulation housing and is located above the optical fiber combiner in the height direction. The second fixing cavity is located between the optical fiber combiner and the cladding light filtering unit in the height direction of the encapsulation housing. The second optical fiber is connected to the cladding light filtering unit after passing through the second arc-shaped wall.

[0015] Preferably, at least one end of the first arcuate wall in the width direction of the encapsulation housing is tangent to the beam output direction of the corresponding beam combining module; at least one end of the second arcuate wall in the height direction of the encapsulation housing is tangent to the output direction of the coupling end.

[0016] Optionally, the coupling filter module includes a horizontally placed partition located between the bottom and top surfaces of the encapsulation housing. The fiber combiner is fixed below the partition. The partition has an opening for the second optical fiber to pass through. The fixing cavity further includes:

[0017] The third fixed cavity includes a third arc-shaped wall and a third planar wall. The bottom surface of the third fixed cavity is fixed to the bottom surface of the packaging shell and extends through the partition to the top surface of the packaging shell in a direction perpendicular to the bottom surface of the packaging shell.

[0018] The third fixed cavity is respectively located on the path of the first optical fiber connecting to the input end and on the path of the second optical fiber transmitting to the opening of the partition.

[0019] Furthermore, the third fixing cavity includes a fourth fixing cavity and a fifth fixing cavity, wherein:

[0020] The arc surface of the fourth arc-shaped wall of the fourth fixed cavity protrudes towards the beam output direction of the beam combining module, and the first optical fiber is connected to the input end through the arc-shaped wall of the fourth fixed cavity;

[0021] The fifth fixed cavity includes one or more, and the arc surface of the fifth arc-shaped wall of the fifth fixed cavity protrudes in the opposite direction to the beam output direction of the beam combining module. The second optical fiber passes through the fifth arc-shaped wall and enters the opening of the partition.

[0022] Preferably, the device includes a cladding light filtering unit, through which the cladding light of the second optical fiber is filtered; the cladding light filtering unit is fixed to the top surface of the partition, and the second optical fiber is input to the cladding light filtering unit through the opening.

[0023] Preferably, the fixed cavity includes a hollow structure.

[0024] Preferably, the cladding optical filtering unit is located above the fiber combiner in the height direction of the encapsulation housing.

[0025] Furthermore, the device includes a nozzle disposed on the side wall of the encapsulation housing, and the second optical fiber is output from the nozzle after cladding light filtering by the cladding light filtering unit.

[0026] Furthermore, the beam combining module includes a polarization beam combiner, a fast-axis collimating lens, a slow-axis collimating lens, and a reflector. The first laser beam emitted by the first light-emitting unit is reflected by the reflector and enters the polarization beam combiner. The second laser beam emitted by the second light-emitting unit enters the polarization beam combiner and is combined to generate a third laser beam. The third laser beam passes through the fast-axis collimating lens and the slow-axis collimating lens and is output through a correspondingly arranged first optical fiber.

[0027] Preferably, the first laser beam is perpendicular to the second laser beam, wherein the fourth laser beam emitted by the laser chip is parallel to the first laser beam and is reflected by a mirror to form the second laser beam.

[0028] The second aspect of this application provides an integrated optical fiber coupling device, including the integrated optical fiber coupling device described in the first aspect of this application.

[0029] The integrated fiber optic coupling device described above, as provided in this application, can achieve at least the following technical effects:

[0030] The laser provided in this application is coupled to multiple independent optical fibers via a beam combining module. After the energy of the multiple fibers is superimposed and combined, the output is a single optical fiber. By setting arc-shaped wall structures in high-risk areas such as the first optical fiber beam combining path and the second optical fiber transmission path inside the device to fix the curvature of the optical fibers, the optical fiber spatial layout inside the device is reconstructed, thereby reducing the stress and bending radius of the optical fibers, improving the heat dissipation efficiency of the beam combining space, and reducing the size of the laser fiber coupling device through a highly integrated structure. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a comparative structural diagram provided for the embodiments of this application;

[0033] Figure 2 A top-view cross-sectional view of an integrated fiber optic coupling device provided as part of an embodiment of this application;

[0034] Figure 3 A cross-sectional view of an integrated fiber optic coupling device provided as part of an embodiment of this application;

[0035] Figure 4A top-view cross-sectional view of the lower layer of the partition of the integrated fiber optic coupling device provided in Embodiment 2 of this application;

[0036] Figure 5 A top-view cross-sectional view of the upper partition of the integrated fiber optic coupling device provided in Embodiment 2 of this application;

[0037] Figure 6 This is a cross-sectional view from the side of the integrated fiber optic coupling device provided in Embodiment 2 of this application.

[0038] Reference numerals: 1. Encapsulation housing; 2. Polarization beam combiner module; 21. Polarization beam combiner; 22. Fast-axis collimating lens; 23. Slow-axis collimating lens; 24. Reflector; 201. First polarization beam combiner module; 202. Second polarization beam combiner module; 3. Coupled filtering module; 311. First optical fiber; 312. Coupled end; 313. Second optical fiber; 321. First fixed cavity; 322. Second fixed cavity; 323. Third fixed cavity; 324. Fourth fixed cavity; 325. Fifth fixed cavity; 326. Sixth fixed cavity; 33. Cladding light filtering unit; 34. Partition; 35. Opening; 4. Nozzle. Detailed Implementation

[0039] The technical solutions of this application will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] This application provides an integrated fiber optic coupling device, comprising: a housing 1, which integrates a light-emitting unit, a beam combining module, and a coupling filter module 3. Preferably, the beam combining module is a polarization beam combining module 2, fixed to the bottom of the housing 1, for polarization beam combining of the laser beam emitted by the light-emitting unit, i.e., the semiconductor laser. The laser beams from the output ends of multiple polarization beam combining modules 2 are respectively coupled into corresponding first optical fibers 311, each first optical fiber 311 being positioned in the laser beam output direction of each polarization beam combining module 2. The coupling filter module 3 includes a fixed cavity and the fiber beam combining module. The optical fiber combiner and cladding light filtering unit 33 are used to filter the laser beams from the output ends of the polarization combining module 2. Multiple first optical fibers 311 receive the laser beams from the output ends of the corresponding polarization combining modules 2 and input them to the input end of the optical fiber combiner. The first optical fibers 311 are coupled into second optical fibers 313 by the coupling end 312 and then input to the cladding light filtering unit 33 for filtering. The filtered second optical fibers 313 are output through the nozzle 4. The fixed cavity includes multiple arc-shaped walls, which are used to fix the curvature of the first optical fibers 311 on the path to the input end by adhering to the arc-shaped walls of the fixed cavity, and to fix the curvature of the second optical fibers 313 on the transmission path by adhering to the arc-shaped walls.

[0041] Furthermore, the side wall of the encapsulation housing 1 is provided with a nozzle 4, which is used to output the second optical fiber 313.

[0042] Specifically, this embodiment provides an integrated fiber optic coupling device that uses polarization beam combining and fiber optic coupling to combine the laser beam. The laser is coupled to multiple independent optical fibers via a polarization beam combining module 2, allowing the energy of the multiple beams to be superimposed, aiming to improve output power or achieve specific beam distribution requirements. After polarization beam combining, the multiple first optical fibers 311 connected to the input end of the fiber combiner are independently combined to output a second optical fiber 313, achieving energy superposition to improve output power and construct a specific beam distribution. Preferably, in this embodiment, a cladding light filtering (CPS) unit is provided inside the encapsulation housing 1. The second optical fiber 313 output from the coupling end is input to the CPS to achieve cladding light filtering, thereby removing the cladding light component of the fiber, improving the spectral purity and beam quality of the laser output, avoiding the risk of fiber overheating and burnout caused by cladding light accumulation, and ensuring the stable and accurate operation of the encapsulation system. The fiber combiner has multiple input ends and one output end, with each input end receiving laser beams transmitted from each output end of the polarization beam combining module 2. The fiber optic combiner combines the optical signals from multiple first fibers into a second fiber and outputs them. It should be understood that the fiber optic combiner described in the application includes fused biconical tapered fiber combiners (where multiple first fibers are arranged side-by-side, heated and stretched to bring their cores close together and achieve mode coupling, then outputting the signal through a second optical fiber), and combiners based on micro-optical elements (such as using lenses, mirrors, filters (e.g., TFF), polarization combiners (PBS), etc., free-space optical elements to collimate the outgoing light from multiple first fibers, combine them through wavelength division multiplexing, polarization multiplexing, or spatial combining, and then focus and couple them into the second fiber before outputting). The CPS is independently and rigidly fixed inside the encapsulation housing 1, integrated on a local section of the second fiber to achieve cladding light filtering.

[0043] Preferably, the coupling filter module 3 in this embodiment has multiple fixed cavities, and at least one sidewall of each fixed cavity is designed as an arc-shaped wall with a specific curvature, and the interior of the fixed cavity is preferably a hollow structure. The radius of curvature of the arc-shaped wall is strictly calculated and must be greater than the minimum allowable bending radius of the optical fiber (the optical fiber includes the core, cladding, and coating; the minimum allowable bending radius of the optical fiber is usually 300 times the cladding diameter, and the minimum bending radius needs to be determined according to the optical fiber model and its product parameters) to avoid... Figure 1In the comparative example shown, the additional loss or damage to the optical fiber caused by excessive bending is illustrated. Before and after the output of the second optical fiber 313 from the fiber combiner, high temperatures arise due to energy convergence at the combining point. Therefore, in this embodiment, the first optical fiber 311 connected to the input end of the fiber combiner is fed into the coupling end 312 by adhering to the arc-shaped wall of the fixed cavity and along the arc surface of the arc-shaped wall. The second optical fiber 313 output from the coupling end 312 is also fed into the input end of the CPS by winding around the surface of the arc-shaped wall. This reduces the bending stress caused by excessive curvature at the fiber combining point and after combining, and fixes the optical fiber transmission path, improving the reliability and stability of the system's laser output. Furthermore, since the fixed cavity is a hollow structure, it can be equipped with air-cooling or water-cooling devices to achieve efficient heat dissipation.

[0044] Furthermore, the polarization beam combining module 2 and the coupling filter module 3 are integrated inside the packaging housing 1. The polarization beam combining module 2 includes a polarization beam combiner 21, a fast-axis collimating lens 22, a slow-axis collimating lens 23, and a reflector 24. The input end of the polarization beam combiner 21 receives the first laser beam emitted by the laser chip and the second laser beam reflected by the reflector 24. The third laser beam output from the polarization beam combiner 21 is collimated by the fast-axis collimating lens 22 and the slow-axis collimating lens 23 before being input into the fiber beam combiner. Preferably, the first laser beam is perpendicular to the second laser beam, wherein the fourth laser beam emitted by the laser chip is parallel to the first laser beam and is reflected by the reflector 24 to obtain the second laser beam. Preferably, the reflector 24 is positioned at a 45° angle to the light output direction of the laser chip. In this embodiment, the polarization beam combining module 2 is preferably in two sets. The two sets of polarization beam combining modules 2 are symmetrical along the central axis of the width direction of the encapsulation housing 1, and the reflectors 24 of the two sets of polarization beam combining modules 2 are set perpendicular to each other.

[0045] Preferably, the cladding optical filtering unit 33 is located above the fiber combiner in the height direction of the encapsulation housing 1 to achieve better heat dissipation of the device.

[0046] This embodiment also provides an integrated fiber optic coupling device, the structure of which includes the integrated fiber optic coupling device described above in this embodiment. Since the principle by which an integrated fiber optic coupling device solves the problem is similar to that of an integrated fiber optic coupling device, the implementation of an integrated fiber optic coupling device can refer to the implementation of an integrated fiber optic coupling device; repeated details will not be elaborated further.

[0047] Example 1

[0048] Based on the integrated optical fiber coupling device provided in the above specific embodiments, this embodiment gives an implementation example of the device, and repeated details will not be described again.

[0049] like Figure 2 andFigure 3 As shown in the preferred embodiment, two sets of polarization combining modules 2 are symmetrically arranged relative to the central axis of the packaging housing 1 in the width direction, and are respectively close to one side of the sidewall in the length direction of the packaging housing 1. The two sets of polarization combining modules 2 are arranged at a relatively large distance, which facilitates the winding and combining of optical fibers. The optical fiber combiner is disposed on the central axis of the packaging housing 1 in the width direction and fixed to the bottom of the packaging housing 1. The cladding light filtering unit 33 is fixed to the top of the packaging housing 1 and is located on the same longitudinal axis as the optical fiber combiner in the height direction.

[0050] Preferably, in this embodiment, the coupling filter module 3 is provided with multiple fixed cavities, including:

[0051] The first fixed cavity 321 includes a first arc-shaped wall and a first flat wall, which together form a cavity structure. The bottom surface of the first fixed cavity 321 is fixed to the bottom surface of the encapsulation housing 1 and extends to the top surface of the encapsulation housing 1 in a direction perpendicular to the bottom surface of the encapsulation housing 1, forming a vertical cavity structure inside the encapsulation housing 1. The first fixed cavities 321 are symmetrically arranged in two groups along the central axis of the width direction of the encapsulation housing 1, corresponding to the positions of the two groups of polarization combining modules 2, and are used to fix the first optical fiber 311 output from the polarization combining module 2 to the input end of the optical fiber combiner. The arc surfaces of the first arc-shaped walls in both groups of the first fixed cavities 321 protrude towards the output direction of the corresponding polarization combining module 2, and each first optical fiber 311 is attached to and input into the coupling end 312 of the optical fiber combiner along the two first arc-shaped walls.

[0052] The second fixed cavity 322 includes a second arc-shaped wall and a second planar wall, which together form a cavity structure. The bottom surface of the second fixed cavity 322 is fixed to the side wall along the length of the encapsulation housing 1 and extends along a direction perpendicular to the side wall to the opposite side wall, forming a parallel cavity structure parallel to the bottom surface. The two ends of the second fixed cavity 322 along the height direction of the encapsulation housing 1 are located between the fiber combiner and the cladding optical filtering unit 33. The arc surface of the second arc-shaped wall protrudes in the opposite direction to the output direction of the two sets of polarization combining modules 2. The second optical fiber 313 output from the fiber combiner is attached and input to the cladding optical filtering unit 33 along the second arc-shaped wall.

[0053] This embodiment provides an integrated fiber optic coupling device. By setting fixed cavities with arc-shaped walls in the horizontal and vertical directions, the first optical fiber 311 output from two sets of polarization combining modules 2 to the input end of the fiber combiner is curvature-fixed through the arc-shaped walls of the first fixed cavity 321 and the second fixed cavity 322, respectively, and then input to the coupling end 312 of the fiber combiner. The second optical fiber 313 output from the coupling end 312 is also curvature-fixed through the arc-shaped wall of the second fixed cavity 322, wound around, and input into the cladding light filtering unit 33. This reduces the bending stress problem caused by excessive fiber curvature before and after the fiber combining point, fixes the fiber transmission path, and allows for a more optimized and integrated arrangement of the device and its internal fibers. This improves the heat dissipation effect of the internal space of the device and enhances the reliability and stability of the system's laser output.

[0054] Example 2

[0055] Based on the above specific implementation methods and the integrated optical fiber coupling device provided in Embodiment 1, this embodiment provides an implementation example of the device, and repeated details will not be described again.

[0056] like Figure 4 , Figure 5 and Figure 6 As shown, in this preferred embodiment, the polarization beam combining module 2 is configured as two sets, and the two sets of polarization beam combining modules 2 are symmetrically arranged along the central axis of the width direction of the packaging shell 1, that is... Figure 4 The first polarization combining module 201 and the second polarization combining module 202 shown are positioned close to the sidewalls along the length of the encapsulation housing 1, which facilitates the arrangement of optical fibers inside the device and improves heat dissipation efficiency. Figure 4 and Figure 5 As shown, the coupling filter module 3 is equipped with a horizontally placed partition 34. Figure 4 This is a top view of the device structure from the perspective of the lower layer of partition 34. Figure 5 This is a top view of the device structure from the perspective of the upper layer of the partition 34. The height of the partition 34 is half the height of the encapsulation housing 1. The fiber optic combiner is located on the central axis in the width direction of the encapsulation housing 1 and is fixed to the bottom of the encapsulation housing 1. The cladding light filtering unit 33 is fixed to the top surface of the partition 34 and is located on the same longitudinal axis as the fiber optic combiner. The partition 34 has an opening 35 for the second fiber 313 output from the coupling end 312 to pass through and input to the upper cladding light filtering unit 33.

[0057] Furthermore, such as Figure 4 , Figure 5 and Figure 6As shown, in this preferred embodiment, the coupling filter module 3 is provided with multiple sets of third fixed cavities 323. Each third fixed cavity 323 includes a third arc-shaped wall and a third planar wall, and the third arc-shaped wall and the third planar wall form a cavity structure. The bottom surface of each third fixed cavity 323 is fixed to the bottom surface of the encapsulation housing 1 and extends through the partition 34 in a direction perpendicular to the bottom surface of the encapsulation housing 1 to the top surface of the encapsulation housing 1. Each third fixed cavity 323 is a vertical cavity disposed inside the encapsulation housing 1. The third arc-shaped walls of the multiple third fixed cavities 323 are respectively used for: fixing the curvature of the first optical fiber 311 at the input end of the optical fiber combiner corresponding to the first polarization combining module 201 and transmitting it to the coupling end 312; fixing the curvature of the first optical fiber 311 at the input end of the optical fiber combiner corresponding to the second polarization combining module 202 and transmitting it to the coupling end 312; and fixing the curvature of the second optical fiber 313 output from the coupling end 312 and passing it through the opening 35 of the partition 34.

[0058] Preferably, the third fixed cavity 323 also includes two types: a fourth fixed cavity 324 and a fifth fixed cavity 325, with multiple fourth fixed cavities 324 and multiple fifth fixed cavities 325 arranged opposite to each other. The number of fourth fixed cavities 324 corresponds to the number of polarization combining modules 2. The arc surface of the fourth arc-shaped wall of each fourth fixed cavity 324 protrudes towards the output direction of each polarization combining module 2, and the first optical fiber 311 is attached to the surface of the fourth arc-shaped wall and transmits to the coupling end 312. The arc surface of the fifth arc-shaped wall of the fifth fixed cavity 325 protrudes in the opposite direction to the output direction of each polarization combining module 2, and the second optical fiber 313 output from the coupling end 312 is attached to the surface of the fifth arc-shaped wall and passes through the opening 35 of the partition 34. Then, it is input to the cladding light filtering unit 33 along the arc-shaped walls of multiple sets of third fixed cavities 323 on the upper layer of the partition 34, and output from the nozzle 4 after passing through the cladding light filtering unit 33.

[0059] Preferred, such as Figure 4 As shown, this embodiment also includes a sixth fixed cavity 326. The sixth arc-shaped wall of the sixth fixed cavity 326 is used to fix the curvature of the transmission path of the second optical fiber 313 on the upper layer of the partition 34 from the cladding optical filter unit to the nozzle 4. The second optical fiber 313 is fixed by attaching to the arc-shaped walls of multiple sets of third fixed cavities 323, thereby overcoming the curvature of the optical fiber transmission path inside the device. Figure 1 The excessive curvature of the optical fiber during its output from the cladding filter unit to the nozzle 4 reduces bending stress and improves the heat dissipation efficiency inside the device.

[0060] The embodiments of the present invention achieve the following technical effects:

[0061] 1. This application highly integrates the three core functional modules of polarization combiner, fiber combiner and cladding light filtering unit into a single package, realizing the stripping of cladding light after fiber combining to improve beam quality and prevent thermal damage. The device has a compact structure and high reliability.

[0062] 2. This application effectively solves the problem of low-loss, high-stability wiring and fixing of the first optical fiber in a compact space by setting an arc-shaped wall structure before and after the optical fiber bundle for fixing the curvature and position of the optical fiber, thereby reducing the bending loss and stress damage of the optical fiber.

[0063] 3. This application reconstructs the internal spatial layout of the device by setting fixed cavities, partitions and other structures, and rationally arranges the fiber optic cables and the positions of each module, thereby improving the integration of the device and meeting the requirements for the stability and reliability of the device operation. The cavity structure and fiber optic cable arrangement also further improve the heat dissipation efficiency of the device.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An integrated fiber coupling device, comprising: The device comprises: a packaging shell, which is internally integrated with a light-emitting unit, a beam combining module, and a coupling filtering module; the beam combining module is used for combining and coupling light beams emitted by the light-emitting unit into corresponding first optical fibers, and the number of the first optical fibers is at least two; the coupling filtering module comprises a fixed cavity and an optical fiber combiner, the optical fiber combiner is fixed to the bottom of the packaging shell, the optical fiber combiner comprises an input end and a coupling end, each first optical fiber is connected to a corresponding input end, and a plurality of first optical fibers are coupled by the optical fiber combiner and output as second optical fibers, the second optical fibers are connected to the coupling end; the fixed cavity comprises a plurality of arc-shaped walls, the plurality of arc-shaped walls are respectively arranged on paths where the first optical fibers are connected to the input ends and on laying paths of the second optical fibers, and the fixed cavity comprises: a first fixed cavity comprising a first arc-shaped wall and a first plane wall, a bottom surface of the first fixed cavity is fixed to a bottom surface of the packaging shell and extends to a top surface of the packaging shell along a direction perpendicular to the bottom surface of the packaging shell, the first fixed cavity is arranged in one-to-one correspondence with the first optical fibers along a width direction of the packaging shell, arc surfaces of a plurality of first arc-shaped walls are all convexly protruding towards a light beam output direction of the corresponding beam combining module, and any first optical fiber is input to the input end of the optical fiber combiner through the first arc-shaped wall; a second fixed cavity comprising a second arc-shaped wall and a second plane wall, a bottom surface of the second fixed cavity is fixed to a side wall in a length direction of the packaging shell and extends to an opposite side wall along a direction perpendicular to the side wall, an arc surface of the second arc-shaped wall is convexly protruding in a direction opposite to the light beam output direction of the beam combining module, light beams output by the optical fiber combiner are transmitted through the second optical fibers, and the second optical fibers are arranged around the second arc-shaped wall.

2. An integrated fiber coupling device as claimed in claim 1, characterized in that The device comprises a cladding light filtering unit, and cladding light of the second optical fibers is filtered through the cladding light filtering unit; the cladding light filtering unit is fixed to a top of the packaging shell and is located above the optical fiber combiner in a height direction; the second fixed cavity is located between the optical fiber combiner and the cladding light filtering unit in the height direction of the packaging shell, and the second optical fibers are connected to the cladding light filtering unit after passing through the second arc-shaped wall.

3. An integrated fiber coupling device as claimed in claim 2, characterized in that At least one end of the first arc-shaped wall in the width direction of the packaging shell is tangent to the light beam output direction of the corresponding beam combining module; and / or, at least one end of the second arc-shaped wall in the height direction of the packaging shell is tangent to the output direction of the coupling end.

4. An integrated fiber coupling device, comprising: The device comprises: a packaging shell, which is internally integrated with a light-emitting unit, a beam combining module, and a coupling filtering module; the beam combining module is used for combining and coupling light beams emitted by the light-emitting unit into corresponding first optical fibers, and the number of the first optical fibers is at least two; The coupling filtering module comprises a fixed cavity and a fiber combiner, the fiber combiner comprises an input end and a coupling end, each of the first fiber connection corresponds to the input end, a plurality of the first fibers are coupled through the fiber combiner and output as second fibers, the second fibers are connected to the coupling end, a partition plate horizontally placed is arranged in the coupling filtering module, the partition plate is located between the bottom surface and the top surface of the packaging shell, the fiber combiner is fixed below the partition plate, and the partition plate is provided with an opening for passing through the second fibers; The fixed cavity comprises a plurality of arc-shaped walls, the plurality of arc-shaped walls are respectively arranged on the paths of the first fiber connection to the input end and the second fiber layout path, and the fixed cavity comprises: A third fixed cavity comprising a third arc-shaped wall and a third plane wall, the bottom surface of the third fixed cavity is fixed to the bottom surface of the packaging shell and extends to the top surface of the packaging shell along a direction perpendicular to the bottom surface of the packaging shell; The third fixed cavity is respectively arranged on the paths of the first fiber connection to the input end and the second fiber transmission to the opening of the partition plate.

5. An integrated fiber coupling device as claimed in claim 4, wherein, The third fixed cavity comprises a fourth fixed cavity and a fifth fixed cavity, wherein: The arc surface of the fourth arc-shaped wall of the fourth fixed cavity protrudes towards the light beam output direction of the combiner module, and the first fiber is connected to the input end through the arc-shaped wall of the fourth fixed cavity; The fifth fixed cavity comprises one or more, the arc surface of the fifth arc-shaped wall of the fifth fixed cavity protrudes towards the opposite direction of the light beam output direction of the combiner module, and the second fiber passes through the fifth arc-shaped wall and enters the opening of the partition plate.

6. An integrated fiber coupling device according to claim 4 or 5, characterized in that The device comprises a cladding light filtering unit, and the cladding light of the second fiber is filtered through the cladding light filtering unit; The cladding light filtering unit is fixed to the top surface of the partition plate, and the second fiber is input into the cladding light filtering unit through the opening.

7. An integrated fiber coupling device as claimed in claim 1 or 4, characterized in that The combiner module comprises a polarization combiner, a fast-axis collimating mirror, a slow-axis collimating mirror and a reflecting mirror, the first laser beam emitted by the first light-emitting unit enters the polarization combiner after being reflected by the reflecting mirror, the second laser beam emitted by the second light-emitting unit enters the polarization combiner to generate a third laser beam after being combined, and the third laser beam is output through the corresponding first fiber after passing through the fast-axis collimating mirror and the slow-axis collimating mirror.

8. An integrated fiber coupling device according to claim 2 or 6, wherein, The fixed cavity comprises a cavity structure; And / or, the device comprises a nozzle, the nozzle is arranged on the side wall of the packaging shell, and the second fiber is output from the nozzle after the cladding light filtering unit filters the cladding light.

9. An integrated fiber coupling device, comprising: The integrated fiber coupling device comprises the integrated fiber coupling device according to any one of claims 1 to 8.

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