Optical fiber coiling device

Abstract

The present application discloses an optical fiber coiling device, and the above optical fiber coiling device is of a columnar structure; a plurality of rectangular grooves are arranged on the outer side of the columnar surface of the optical fiber coiling device; the rectangular grooves are used for coiling optical fibers. By adopting the above technical solution, the problems such as poor stability of the polarization maintaining performance of polarization maintaining optical fibers in the related art are solved.

Description

Technical Field

[0001] This application relates to the field of optical fibers, and more particularly, to an optical fiber coiling device. Background Art

[0002] Polarization-maintaining optical fiber adds sufficient stress to the core of ordinary optical fiber, so that the optical fiber generates high birefringence in two mutually perpendicular directions on the cross-section, thereby realizing its polarization-maintaining performance. However, the polarization-maintaining performance of polarization-maintaining optical fiber is easily affected by the attenuation of the optical fiber (such as: poor roundness of the optical fiber core, poor roundness of the stress area of the optical fiber, etc.), the characteristics of the optical fiber material itself, and external factors (such as: temperature fluctuations, mechanical disturbances, etc.), which will affect the birefringence index of the polarization-maintaining optical fiber.

[0003] In the prior art, when reducing the influence of external factors such as temperature fluctuations and mechanical disturbances on the polarization-maintaining performance, the polarization-maintaining optical fiber is often wound in a "V"-shaped groove in a planar runway. In this way, since the contact between the polarization-maintaining optical fiber and the groove is point contact, the polarization-maintaining optical fiber may be unstable, which will affect the polarization-maintaining performance of the polarization-maintaining optical fiber. Therefore, how to keep the polarization-maintaining performance of the polarization-maintaining optical fiber stable is a problem that must be considered at present.

[0004] In the related art, no effective solution has been proposed for problems such as poor stability of the polarization-maintaining performance of polarization-maintaining optical fiber. Summary of the Invention

[0005] Embodiments of this application provide an optical fiber coiling device to at least solve problems such as poor stability of the polarization-maintaining performance of polarization-maintaining optical fiber in the related art.

[0006] According to an embodiment of this application, an optical fiber coiling device is provided, including: the optical fiber coiling device is a columnar structure; multiple circles of rectangular grooves are arranged on the outer side of the columnar surface of the optical fiber coiling device; the rectangular grooves are used for coiling optical fibers.

[0007] Optionally, the optical fiber includes a polarization-maintaining optical fiber, and each groove surface of the rectangular groove is in contact with the polarization-maintaining optical fiber.

[0008] Optionally, the diameter of the columnar structure is determined according to the core size and / or cladding size of the optical fiber, and the optical fiber is coiled on the columnar structure to filter out multimode modes in the optical fiber.

[0009] Optionally, multiple circles of the rectangular grooves are engraved on the outer side of the columnar surface of the optical fiber coiling device according to a target slope, where the target slope is used to control the transverse stress of the optical fiber to be less than or equal to a stress threshold.

[0010] Optionally, the optical fiber coiling device further includes: an optical fiber stage, an end cap, and an end cap cover, where

[0011] The end cap is fixed on the optical fiber stage, the end cap cover covers the end cap, the end cap is connected to the output end of the optical fiber, and the optical fiber stage is fixed on the first end face of the columnar structure;

[0012] The end cap cover is used to release the stray light generated in the optical fiber.

[0013] Optionally, an end cap groove is formed between the optical fiber stage and the end cap cover, and the shape of the end cap groove matches that of the end cap, where

[0014] The end cap groove is used to fix the end cap.

[0015] Optionally, the end cap cover is made of a transparent material.

[0016] Optionally, the device further includes: a heat dissipation device, where

[0017] The second end face of the columnar structure is in contact with the heat dissipation device, and the area where the heat dissipation device is in contact with the columnar structure is filled with a liquid heat conduction medium.

[0018] Optionally, the heat conduction medium includes: heat dissipation silicone grease or heat dissipation silica gel.

[0019] Optionally, a first heat dissipation channel is provided in the heat dissipation device, and a second heat dissipation channel is provided in the cylinder body of the columnar structure, where

[0020] The first heat dissipation channel is communicated with the second heat dissipation channel, and the second heat dissipation channel forms an n-shaped pipeline structure in the cylinder body of the columnar structure;

[0021] Both the first heat dissipation channel and the second heat dissipation channel are used to fill the coolant.

[0022] In the embodiments of the present application, the optical fiber coiling device is a columnar structure; multiple rectangular grooves are provided on the outer side of the columnar surface of the optical fiber coiling device; the rectangular grooves are used to coil the optical fiber, that is, multiple rectangular grooves are provided on the outer side of the columnar surface of the columnar optical fiber coiling device. By coiling the optical fiber in the rectangular grooves, the contact area between the optical fiber and the rectangular grooves can be increased, thereby increasing the stability of the optical fiber placement and avoiding the reduction of the optical fiber performance caused by the unstable placement of the optical fiber. By adopting the above technical solution, the problems such as the poor stability of the polarization maintaining performance of polarization maintaining optical fiber in the related art are solved, and the technical effect of improving the stability of the polarization maintaining performance of polarization maintaining optical fiber is achieved. Description of the Drawings

[0023] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0024] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 is the structural block diagram of an optical fiber coiling device provided in this embodiment;

[0026] Figure 2 is a schematic diagram of an optical fiber coiling device according to an embodiment of the present application Figure 1 ;

[0027] Figure 3 is a schematic diagram of an optical fiber coiling device according to an embodiment of the present application Figure 2 ;

[0028] Figure 4 is the deployment schematic diagram of an optical fiber coiling device according to an embodiment of the present application;

[0029] Figure 5 is the schematic diagram of an end cap groove according to an embodiment of the present application;

[0030] Figure 6 is the schematic diagram of a second heat dissipation channel according to an embodiment of the present application;

[0031] Figure 7 is the connection schematic diagram of an optical fiber coiling device according to an embodiment of the present application. Detailed implementation manners

[0032] In order to enable those skilled in the art to better understand the solutions of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0033] It should be noted that the terms "first", "second", etc. in the specification, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily limit to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0034] In an embodiment of the present application, an optical fiber coiling device is provided. Figure 1 It is a structural block diagram of an optical fiber coiling device provided in this embodiment, as Figure 1 shown. The above optical fiber coiling device includes: the optical fiber coiling device 102 has a columnar structure; a plurality of rectangular grooves 102-2 are provided on the outer side 102-1 of the columnar surface of the optical fiber coiling device 102; the rectangular grooves 102-2 are used for coiling the optical fiber 104.

[0035] Through the above optical fiber coiling device, a plurality of rectangular grooves are provided on the outer side of the columnar surface of the columnar-structured optical fiber coiling device. By coiling the optical fiber in the rectangular grooves, the contact area between the optical fiber and the rectangular grooves can be increased, thereby increasing the stability of the optical fiber placement and avoiding the reduction of the optical fiber performance caused by the unstable placement of the optical fiber. By adopting the above technical solution, the problems such as the poor stability of the polarization-maintaining performance of polarization-maintaining optical fibers in the related art are solved, and the technical effect of improving the stability of the polarization-maintaining performance of polarization-maintaining optical fibers is achieved.

[0036] In an exemplary embodiment, the optical fiber includes a polarization-maintaining optical fiber, and each groove surface of the rectangular groove is in contact with the polarization-maintaining optical fiber.

[0037] Optionally, in this embodiment, the optical fiber coiling device can be used but not limited to coiling polarization-maintaining optical fibers. By making each groove surface of the rectangular groove in contact with the polarization-maintaining optical fiber, the contact area between the rectangular groove and the polarization-maintaining optical fiber can be increased, and the polarization-maintaining optical fiber is stably fixed in the rectangular groove, reducing the reduction of the polarization-maintaining performance of the polarization-maintaining optical fiber caused by the unstable placement of the polarization-maintaining optical fiber.

[0038] In an exemplary embodiment, the diameter of the columnar structure is determined according to the core size and / or cladding size of the optical fiber, and the optical fiber is coiled on the columnar structure to filter out multi-mode modes in the optical fiber.

[0039] Optionally, in this embodiment, the diameter of the columnar structure can be determined by comprehensively considering, but not limited to, the core size and / or the cladding size of the optical fiber, so as to filter out the multimode modes in the main amplification, thereby obtaining a "pure" fundamental mode beam output, improving the spot roundness of the laser output, and greatly improving the quality of the laser output beam.

[0040] In an exemplary embodiment, multiple turns of the rectangular grooves are engraved on the outer cylindrical surface of the optical fiber coiling device, wherein the target slope is used to control the lateral stress of the optical fiber to be less than or equal to the stress threshold.

[0041] Optionally, in this embodiment, by controlling the slope of the rectangular grooves on the outer cylindrical surface of the optical fiber coiling device, the lateral stress on the polarization-maintaining optical fiber can be controlled within a suitable stress range, thereby realizing the stability of maintaining the polarization-maintaining performance of the polarization-maintaining optical fiber.

[0042] In an exemplary embodiment, the optical fiber coiling device further includes: an optical fiber stage, an end cap, and an end cap cover, wherein the end cap is fixed on the optical fiber stage, the end cap cover covers the end cap, the end cap is connected to the output end of the optical fiber, and the optical fiber stage is fixed on the first end face of the columnar structure; the end cap cover is used to release the stray light generated in the optical fiber.

[0043] Optionally, in this embodiment, by fixing the end cap connected to the output end of the optical fiber, the end cap can be stably fixed on the optical fiber stage, improving the stability of the fixation of the polarization-maintaining optical fiber. Figure 2 is a schematic diagram of an optical fiber coiling device according to an embodiment of the present application Figure 1 As Figure 2 shown, the end cap 202 is connected to the output end 204 of the optical fiber, the end cap 202 is fixed on the optical fiber stage 206, the end cap cover 208 covers the end cap 202, and the optical fiber stage 206 can be fixed on the first end face 102-3 of the columnar structure 102 by, but not limited to, screws. Figure 3 is a schematic diagram of an optical fiber coiling device according to an embodiment of the present application Figure 2 As Figure 3 shown, in this way, the end cap 202 is fixed on the optical fiber stage 206, the end cap cover 208 covers the end cap 202, and the optical fiber stage 206 is fixed on the first end face 102-3 of the columnar structure 102. In this way, stable mechanical strength can be ensured, and the influence of mechanical disturbance on the polarization-maintaining performance of the polarization-maintaining optical fiber can be reduced.

[0044] Optionally, in this embodiment, the optical fiber coiling device can be deployed, but not limited to, after the main amplification in the optical path structure. Figure 4 is a deployment schematic diagram of an optical fiber coiling device according to an embodiment of the present application. As Figure 4As shown, the seed light emitted by the narrow linewidth seed source can, but is not limited to, pass through a first-stage pre-amplifier, a second-stage pre-amplifier, and a third-stage main amplifier to obtain the fundamental frequency light with the required power. The fiber coiling device can, but is not limited to, be deployed at a position after the third-stage main amplifier, the optical fiber is coiled on the fiber coiling device, and the output end cap is fixed on the fiber table, improving the stability of deploying the polarization-maintaining fiber. In addition, by coiling the optical fiber on the fiber coiling device, the active optical fiber in the main amplification is relatively "isolated", reducing the maintenance cost of the laser.

[0045] In an exemplary embodiment, an end cap groove is formed between the fiber table and the end cap cover, and the shape of the end cap groove matches that of the end cap, where the end cap groove is used to fix the end cap.

[0046] Optionally, in this embodiment, Figure 5 is a schematic diagram of an end cap groove according to an embodiment of the present application. As Figure 5 shown, it can, but is not limited to, be a schematic cross-sectional view of the cross-section A1-A1 intercepted from the top view of the fiber table 206. The end cap groove 210 on the fiber table 206 can, but is not limited to, include a straight channel structure 210-1 and a stepped structure 210-2. The end cap groove and the end cap cover are slightly larger than the end cap to ensure that the end cap can work safely in the end cap groove and will not be crushed by the end cap cover and the end cap groove. At the same time, there is space for the glue used to fix the end cap. The glue for gluing the end cap should be non-volatile and have a small coefficient of thermal expansion. In this way, the fusion joint between the end cap and the optical fiber can be fully protected, greatly improving the beam output stability of the laser.

[0047] In an exemplary embodiment, the end cap cover is made of a transparent material.

[0048] Optionally, in this embodiment, the end cap cover can, but is not limited to, be made of a transparent material, which can release the stray light emitted from the end cap, avoid the temperature of the fiber table being too high, and thus affect the polarization-maintaining performance of the polarization-maintaining fiber.

[0049] In an exemplary embodiment, the device further includes: a heat dissipation device, where the second end face of the columnar structure is in contact with the heat dissipation device, and the area where the heat dissipation device is in contact with the columnar structure is filled with a liquid heat-conducting medium.

[0050] Optionally, in this embodiment, the second end face of the columnar structure can, but is not limited to, be connected to the heat dissipation device by screws to ensure the stability of the contact between the fiber coiling device and the heat dissipation device; and a liquid heat-conducting medium is filled in the area where the heat dissipation device is in contact with the columnar structure, which can timely transfer the heat generated by the optical fiber coiled on the fiber coiling device to the heat dissipation device for heat dissipation, avoiding the temperature of the optical fiber being too high and affecting the polarization-maintaining performance of the polarization-maintaining fiber.

[0051] In an exemplary embodiment, the heat-conducting medium includes: heat-conducting silicone grease or heat-conducting silica gel.

[0052] In an exemplary embodiment, a first heat dissipation channel is provided in the heat dissipation device, and a second heat dissipation channel is provided in the cylindrical structure of the columnar structure. Among them, the first heat dissipation channel communicates with the second heat dissipation channel, and the second heat dissipation channel forms an n-shaped pipe structure in the cylindrical structure of the columnar structure; the first heat dissipation channel and the second heat dissipation channel are both used to fill the coolant.

[0053] Optionally, in this embodiment, the first heat dissipation channel provided in the heat dissipation device may but is not limited to communicate with the second heat dissipation channel provided in the cylindrical structure of the columnar structure, and the first end face of the columnar structure is sealed by friction welding, so that the second heat dissipation channel does not penetrate the columnar structure at the first end face. The heat generated by the polarization-maintaining fiber can be taken away in time through the coolant filled in the first heat dissipation channel and the second heat dissipation channel, quickly reaching and maintaining thermal equilibrium, greatly reducing the influence of temperature rise on the polarization-maintaining performance of the fiber, and improving the stability of the polarization-maintaining performance of the fiber.

[0054] Optionally, in this embodiment, the second heat dissipation channel may but is not limited to form an n-shaped pipe structure in the cylindrical structure of the columnar structure. Figure 6 It is a schematic diagram of a second heat dissipation channel according to an embodiment of the present application. As Figure 6 shown, the cylindrical fiber coiling device 602 of the columnar structure may but is not limited to be provided with a heat dissipation channel 602-1 and a heat dissipation channel 602-2 of an n-shaped pipe structure. The cylindrical fiber coiling device 602 of the columnar structure may be cut along the section A2-A2 and the section B-B from the first end face 602-3 of the cylindrical fiber coiling device 602 of the columnar structure to obtain the sectional views of the section A2-A2 and the section B-B. The sectional views of the section A2-A2 and the section B-B show the heat dissipation channel 602-1 and the heat dissipation channel 602-2 of the n-shaped pipe structure.

[0055] It should be noted that Figure 6 only uses the second heat dissipation channel with two n-shaped pipe structures formed in the cylindrical structure of the columnar structure to explain the cylindrical structure of the columnar structure. In fact, the number of the second heat dissipation channels with n-shaped pipe structures in the cylindrical structure of the columnar structure may but is not limited to 1, or 2 or 5, etc. The present application does not limit the number of the second heat dissipation channels.

[0056] Optionally, in this embodiment, for a high-power fiber laser, the active fiber generates a significant amount of heat, and the temperature at the fusion joint is even higher. The fusion joint between the active polarization-maintaining fiber and the passive polarization-maintaining fiber in the main amplification of the laser can be coiled around the cylindrical structure of the cylinder body. At the same time, another fusion joint can be placed in the straight groove (i.e., the above-mentioned end cap groove) of the fiber stage close to the cylindrical structure, which can meet the requirement of timely heat dissipation.

[0057] Optionally, in this embodiment, for a laser with a relatively low average power but a high peak power of its output laser (this places great demands on the length of the fiber in the main amplification. The longer the fiber, the lower the power that the laser can output, and the heat generation of the active fiber is related to the average power), by coiling the fiber around the cylindrical structure of the cylinder body, the fundamental frequency light requirements of a 213 nm deep ultraviolet laser can be met. After the fundamental frequency light passes through the second, third, and fifth harmonic generation crystals, a relatively high-power 213 nm deep ultraviolet laser can be output. In addition, by coiling the fiber around the cylindrical structure of the cylinder body, a high-power laser can also output a nearly kilowatt stable linearly polarized fundamental frequency light. After the fundamental frequency light passes through the second harmonic generation crystal, a green light output of several hundred watts can be obtained.

[0058] To better understand the structure and connection method of the above fiber coiling device, the structure and connection method of the above fiber coiling device will be further explained below in combination with optional embodiments, which can be but are not limited to being applicable to the embodiments of the present application.

[0059] Figure 7 is a connection schematic diagram of a fiber coiling device according to an embodiment of the present application. As Figure 7 shown, the end cap 702 is connected to the output end 704 of the fiber. The end cap 702 is fixed on the fiber stage 706. The end cap cover 708 covers the end cap 702. The fiber stage 706 is fixed on the first end face 710-1 of the cylindrical structure of the cylinder body 710. The second end face 710-2 of the cylindrical structure can be but is not limited to being in contact with the heat dissipation device 712, and the heat dissipation device 712 can be but is not limited to deploying the first heat dissipation channel 712-1.

[0060] It should be noted that Figure 7 only explains the inlet and outlet of the first heat dissipation channel on the same side of the heat dissipation device. In fact, the inlet and outlet of the first heat dissipation channel can be but are not limited to being distributed on the same side or different sides of the heat dissipation device and any position that meets the actual heat dissipation requirements. The present application does not limit this.

[0061] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementation manners, and will not be elaborated herein.

[0062] Obviously, those skilled in the art should understand that the various modules or steps of the present application described above can be implemented by a general-purpose computing device. They can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Optionally, they can be implemented by program code executable by the computing device. Thus, they can be stored in a storage device and executed by the computing device. And in some cases, the steps shown or described can be executed in a different order than here, or they can be separately made into individual integrated circuit modules, or multiple modules or steps among them can be made into a single integrated circuit module for implementation. In this way, the present application is not limited to any specific combination of hardware and software.

[0063] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. An optical fiber coiling device, characterized in that, Comprising: The optical fiber coiling device is of a columnar structure; Multiple circles of rectangular grooves are arranged on the outer side of the cylindrical surface of the optical fiber coiling device; The rectangular grooves are used for coiling the optical fiber; Wherein, the optical fiber includes a polarization-maintaining optical fiber, and each groove surface of the rectangular groove is in contact with the polarization-maintaining optical fiber; Wherein, the optical fiber coiling device further includes: an optical fiber stage, an end cap and an end cap cover. The end cap is connected to the output end of the optical fiber. The end cap is fixed on the optical fiber stage. The end cap cover covers the end cap. The optical fiber stage is fixed on the first end surface of the columnar structure by screws.

2. The device according to claim 1, wherein The diameter of the columnar structure is determined according to the core size and / or the cladding size of the optical fiber. The optical fiber is coiled on the columnar structure to filter out multi-mode modes in the optical fiber.

3. The device according to claim 1, wherein Multiple circles of the rectangular grooves are engraved on the outer side of the cylindrical surface of the optical fiber coiling device according to a target slope. Wherein, the target slope is used to control the lateral stress of the optical fiber to be less than or equal to a stress threshold.

4. The device according to claim 1, characterized in that, The end cap cover is used to release the stray light generated in the optical fiber.

5. The device according to claim 4, characterized in that, An end cap groove is formed between the optical fiber stage and the end cap cover. The shape of the end cap groove matches that of the end cap. Wherein, The end cap groove is used to fix the end cap.

6. The device according to claim 4, characterized in that The end cap cover is made of a transparent material.

7. The device according to claim 1, characterized in that, The device further includes: a heat dissipation device. Wherein, The second end surface of the columnar structure is in contact with the heat dissipation device. The area where the heat dissipation device is in contact with the columnar structure is filled with a liquid heat-conducting medium.

8. The device according to claim 7, characterized in that, The heat-conducting medium includes: heat dissipation silicone grease or heat dissipation silica gel.

9. The device according to claim 7, wherein A first heat dissipation channel is arranged in the heat dissipation device, and a second heat dissipation channel is arranged in the cylindrical body of the columnar structure. Wherein, The first heat dissipation channel is communicated with the second heat dissipation channel. The second heat dissipation channel forms an n-shaped pipeline structure in the cylindrical body of the columnar structure; Both the first heat dissipation channel and the second heat dissipation channel are used for filling a coolant.

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