Polarization-maintaining fiber-based method for removing cladding light and polarization-maintaining fiber

Abstract

The present invention relates to the technical field of laser signal transmission, and particularly relates to a method for stripping cladding light based on polarization-maintaining fiber and a polarization-maintaining fiber. A method for stripping cladding light based on polarization-maintaining fiber is characterized by comprising: obtaining a characteristic fiber region matching a first predetermined size on the predetermined polarization-maintaining fiber in a state where the predetermined polarization-maintaining fiber is obtained; performing an arranged patterning process on the characteristic fiber region in a state where a characteristic image is displayed in the characteristic fiber region to form light leakage holes.

Description

Technical Field

[0001] The present invention relates to the technical field of laser signal transmission, and particularly relates to a method for stripping cladding light based on polarization-maintaining fiber and a polarization-maintaining fiber. Background Art

[0002] In ultrafast lasers, the fiber-plus-solid technology is often adopted. Due to advantages such as high conversion efficiency, good beam quality, compact structure, good heat dissipation capacity, and good stability, linearly polarized fiber amplifiers often serve as the infrared laser part in ultrafast lasers. With the increasing development and maturity of ultrafast lasers, higher requirements are imposed on parameters such as spot roundness, beam quality, and extinction ratio of the infrared linearly polarized fiber amplifier. In order to obtain an infrared amplifier with high spot roundness, high beam quality, and high extinction ratio, it is necessary to strip the cladding light in a polarization-maintaining panda double-clad fiber, and the higher the stripping efficiency, the better the beam quality and the higher the extinction ratio.

[0003] The existing methods for stripping fiber cladding light are divided into three types: fiber surface gluing method, chemical reagent corrosion method, and laser engraving method. The fiber surface gluing method is to apply a high refractive index glue on the fiber surface so that the cladding light does not satisfy the total reflection condition and leaks out. The chemical reagent corrosion method is to immerse the fiber in strong acid chemical reagents to corrode the cladding so that the cladding light leaks out to achieve the purpose of stripping the cladding light. The laser engraving method is to use a focused laser to etch grooves or patterns on the surface of the fiber cladding so that the cladding light leaks out to achieve the purpose of stripping the cladding light. The above three methods are all operation methods for non-polarization-maintaining double-clad fibers in continuous lasers, but they are not completely suitable for the double-clad panda polarization-maintaining fiber in a linearly polarized fiber amplifier. The biggest difference between the double-clad panda polarization-maintaining fiber and the ordinary double-clad non-polarization-maintaining fiber is that there is a pair of circular doping stress regions similar to panda eyes in the cladding region of the polarization-maintaining fiber. This stress region is an important fiber structure design to ensure the extinction ratio of the transmitted light. Therefore, when dealing with the cladding light of the double-clad panda polarization-maintaining fiber, in order to ensure the extinction ratio parameter of the transmitted light, it is necessary to consider not damaging the stress region structure. Therefore, the traditional three methods for stripping cladding light have their respective disadvantages when facing polarization-maintaining fibers. 1. The fiber surface gluing method is suitable for polarization-maintaining fibers and does not damage the stress region structure, but the stripping efficiency is low, and the cladding light cannot be deeply stripped, and it is also easy to burn the fiber under high power conditions. 2. The chemical reagent corrosion method will damage the stress region structure and cause the extinction ratio to decrease, and it is not suitable for the double-clad panda polarization-maintaining fiber. 3. The laser engraving method for non-polarization-maintaining fibers is not completely suitable for polarization-maintaining fibers because the non-polarization-maintaining laser engraving method may damage the stress region structure and cause the extinction ratio to decrease. Summary of the Invention

[0004] In view of the technical deficiencies of the prior art, the present invention provides a method for stripping cladding light based on polarization-maintaining fiber and a polarization-maintaining fiber. Among them, a method for stripping cladding light based on polarization-maintaining fiber will not damage the stress zone structure of panda-eye fiber, and can also achieve cladding light stripping, thereby ensuring the high extinction ratio characteristic of fiber transmission. Specifically:

[0005] On the one hand, the present invention provides a method for stripping cladding light based on polarization-maintaining fiber, which includes:

[0006] When the state of the predetermined polarization-maintaining fiber is obtained, a characteristic fiber area matching the first predetermined size is obtained on the predetermined polarization-maintaining fiber;

[0007] When the characteristic fiber area displays a characteristic image, the characteristic fiber area is subjected to an arranged patterning process to form light leakage holes.

[0008] Preferably, in the above method for stripping cladding light based on polarization-maintaining fiber, when the state of the predetermined polarization-maintaining fiber is obtained, obtaining a characteristic fiber matching the first predetermined size on the predetermined polarization-maintaining fiber specifically includes:

[0009] When a polarization-maintaining panda-eye type fiber with a length of not less than 0.3 m is obtained, the coating layer of the polarization-maintaining panda-eye type fiber is stripped to expose the cladding of the first predetermined size of the polarization-maintaining panda-eye type fiber;

[0010] Among them, the area where the cladding is exposed forms the characteristic fiber area, and the length of the first predetermined size is not less than 50 mm and not greater than the diameter of the polarization-maintaining fiber encapsulation glass tube.

[0011] Preferably, in the above method for stripping cladding light based on polarization-maintaining fiber, before performing the arranged patterning process on the characteristic fiber area to form light leakage holes when the characteristic fiber area displays a characteristic image, it further includes:

[0012] Cleaning the characteristic fiber area.

[0013] Preferably, in the above method for stripping cladding light based on polarization-maintaining fiber, wiping the characteristic fiber area with alcohol is used to achieve the cleaning process.

[0014] Preferably, in the above method for stripping cladding light based on polarization-maintaining fiber, when performing the arranged patterning process on the characteristic fiber area to form light leakage holes when the characteristic fiber area displays a characteristic image, it specifically includes:

[0015] When the characteristic fiber area is immersed in a predetermined medium; adjusting the posture of the characteristic fiber area so that the characteristic image is displayed;

[0016] While in the state of displaying the characteristic image, evacuate the predetermined medium to expose the characteristic optical fiber region, and perform patterning on the first surface and the second surface of the characteristic optical fiber region respectively to form light leakage holes.

[0017] Preferably, in the above-mentioned method for stripping cladding light based on polarization-maintaining optical fiber, wherein: the predetermined medium is glycerol.

[0018] Preferably, in the above-mentioned method for stripping cladding light based on polarization-maintaining optical fiber, wherein: while the characteristic optical fiber region is immersed in the predetermined medium; adjusting the posture of the characteristic optical fiber region to display the characteristic image specifically includes:

[0019] While the characteristic optical fiber region is immersed in glycerol, observe the current posture of the characteristic optical fiber region through a microscope;

[0020] Rotate the characteristic optical fiber region until the characteristic image is displayed, and the characteristic image is six straight lines that are symmetric with respect to the central axis of the fiber core.

[0021] Preferably, in the above-mentioned method for stripping cladding light based on polarization-maintaining optical fiber, wherein: while in the state of displaying the characteristic image, evacuate the predetermined medium to expose the characteristic optical fiber region, and performing patterning on the first surface and the second surface of the characteristic optical fiber region respectively to form light leakage holes specifically includes:

[0022] While six straight lines that are symmetric with respect to the central axis of the fiber core are displayed, expose the optical fiber characteristic region, and perform cleaning on the optical fiber characteristic region;

[0023] While the laser focused beam is normally incident on the characteristic optical fiber region, perform photolithography drilling on the first surface of the characteristic optical fiber region through the laser to form a first light leakage hole;

[0024] Rotate the characteristic optical fiber region by 180°, while the laser focused beam is normally incident on the characteristic optical fiber region, perform photolithography drilling on the second surface of the characteristic optical fiber region through the laser to form a second light leakage hole.

[0025] Preferably, in the above-mentioned method for stripping cladding light based on polarization-maintaining optical fiber, wherein: the light leakage holes are located at both ends of the stress region of the polarization-maintaining optical fiber.

[0026] On the other hand, the present invention further provides a polarization-maintaining optical fiber, which includes a cladding light stripping structure arranged at the end of the polarization-maintaining optical fiber, and the cladding light stripping structure is formed by the above-mentioned method for stripping cladding light based on polarization-maintaining optical fiber.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] While the characteristic image is being displayed, perform photolithographic drilling on the optical fiber, so as to achieve the function of stripping the cladding light without damaging the stress area of the polarization-maintaining optical fiber, which can ensure the high extinction ratio characteristic of optical fiber transmission. In addition, this cladding light processing method is suitable for high power. Description of the Drawings

[0029] To better understand and illustrate some embodiments of the present invention, the following will describe with reference to the drawings in connection with the description of the embodiments. In these drawings, the same numerical reference numerals indicate corresponding parts in the drawings.

[0030] Figure 1 Schematic flow chart of a method for stripping cladding light based on polarization-maintaining optical fiber provided by an embodiment of the present invention;

[0031] Figure 2 Schematic flow chart of a method for stripping cladding light based on polarization-maintaining optical fiber provided by an embodiment of the present invention;

[0032] Figure 3 Schematic diagram of the working principle of a cladding light stripper formed by a method for stripping cladding light based on polarization-maintaining optical fiber provided by an embodiment of the present invention;

[0033] Figure 4 Schematic diagram of the partial step structure of a method for stripping cladding light based on polarization-maintaining optical fiber provided by an embodiment of the present invention;

[0034] Figure 5 Schematic diagram of the partial step structure of a method for stripping cladding light based on polarization-maintaining optical fiber provided by an embodiment of the present invention;

[0035] Figure 6 Schematic diagram of the partial step structure of a method for stripping cladding light based on polarization-maintaining optical fiber provided by an embodiment of the present invention;

[0036] Figure 7 Schematic diagram of the partial step structure of a method for stripping cladding light based on polarization-maintaining optical fiber provided by an embodiment of the present invention;

[0037] Figure 8 Comparison chart of stripping efficiency test data of a cladding light stripper formed by a method for stripping cladding light based on polarization-maintaining optical fiber provided by an embodiment of the present invention;

[0038] Figure 9 Comparison chart of extinction ratio test data of a cladding light stripper formed by a method for stripping cladding light based on polarization-maintaining optical fiber provided by an embodiment of the present invention when passing 20W and 50W signal lights at the same stripping efficiency;

[0039] Figure 10 Comparison chart of output spot test data of a cladding light stripper formed by a method for stripping cladding light based on polarization-maintaining optical fiber provided by an embodiment of the present invention when passing 20W signal light at the same stripping efficiency; Detailed implementation manners

[0040] The following description with reference to the accompanying drawings is for facilitating a comprehensive understanding of various embodiments of the present invention defined by the claims and their equivalent contents. These embodiments include various specific details for facilitating understanding, but these are only regarded as exemplary. Therefore, those skilled in the art can understand that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the present invention. In addition, for briefly and clearly describing the present invention, the description of well-known functions and structures will be omitted.

[0041] The terms and phrases used in the following specification and claims are not limited to the literal meanings, but are only for clearly and consistently understanding the present invention. Therefore, for those skilled in the art, it can be understood that providing the description of various embodiments of the present invention is only for the purpose of illustration, rather than limiting the present invention defined by the appended claims and their equivalents.

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in some embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0043] Embodiment 1

[0044] As Figure 1 shown, the present invention provides a method for stripping cladding light based on polarization-maintaining fiber, wherein: it includes,

[0045] Step S110: Under the condition of obtaining a predetermined polarization-maintaining fiber, obtain a characteristic fiber area on the predetermined polarization-maintaining fiber that matches a first predetermined size.

[0046] Schematically, the predetermined polarization-maintaining fiber is a polarization-maintaining double-clad panda-eye type fiber. The polarization-maintaining double-clad panda-eye type fiber includes a photolithography processing area. A first stress area and a second stress area are respectively arranged in the photolithography processing area. An optical fiber core is arranged between the first stress area and the second stress area. An inner coating layer and an outer coating layer are respectively coated outside the photolithography processing area. The inner coating layer and the outer coating layer of the polarization-maintaining double-clad panda-eye type fiber are stripped to expose the photolithography processing area of the polarization-maintaining double-clad panda-eye type fiber. The exposed photolithography processing area is the characteristic fiber area.

[0047] Further preferably, in the state of obtaining a polarization-maintaining panda-eye type optical fiber with a length of not less than 0.3 m, the coating layer of the polarization-maintaining panda-eye type optical fiber is peeled off so that the lithography processing area of the first predetermined size of the polarization-maintaining panda-eye type optical fiber is exposed; wherein, the area where the lithography processing area is exposed forms the characteristic optical fiber area, and the length of the first predetermined size is not less than 50 mm and not greater than the diameter of the polarization-maintaining optical fiber encapsulation glass tube.

[0048] Step S120: Perform an arranged patterning process on the characteristic optical fiber area in the state where the characteristic image is displayed in the characteristic optical fiber area to form light leakage holes. Further, the characteristic image is six straight lines that are symmetric with each other with the core central axis as the axis of symmetry. Schematically,

[0049] In the state where six straight lines that are symmetric with each other with the core central axis as the axis of symmetry are displayed, the distance between the first stress area and the core in the horizontal direction in the characteristic optical fiber area is the largest, and the distance between the second stress area and the core in the horizontal direction is the largest. In this state, the first stress area and the second stress area are the farthest from the lithography device. Further, the depth range of the light leakage holes is 100 μm to 200 μm, and the characteristic optical fiber area is subjected to lithography and drilling by a lithography device to prevent the light leakage holes from damaging the first stress area and / or the second stress area.

[0050] Among them, the patterning process is intended to form at least one row of equally spaced light leakage holes, and the spacing of the light leakage holes can be 60 μm. Further preferably, the light leakage holes can be four rows. Or the light leakage holes are located at both ends of the polarization-maintaining optical fiber stress area. The light leakage holes are arranged at equal intervals, so that the cladding light is gradually scattered out.

[0051] For the optical fiber formed by the above method for stripping cladding light based on a polarization-maintaining optical fiber, when the cladding light is transmitted to the area of the optical fiber with light leakage holes for stripping, the equally spaced light leakage holes destroy the total internal reflection condition of the cladding, so that the cladding light is scattered out of the lithography processing area. In addition, since the light leakage holes in the present application are arranged at equal intervals, when the cladding light continues to be transmitted in the state where it is not completely scattered in the first light leakage hole, when it encounters the second and third light leakage holes, it is gradually scattered out. As shown in Figure 3 below, after testing, when the transmission distance of the cladding light reaches more than 50 mm, the stripping rate of the cladding light reaches 99%.

[0052] As a further preferred implementation, for the above method for stripping cladding light based on a polarization-maintaining optical fiber, wherein: before step S120: performing an arranged patterning process on the characteristic optical fiber area in the state where the characteristic image is displayed in the characteristic optical fiber area to form light leakage holes, further includes:

[0053] Step S119: Clean the characteristic optical fiber region. Further, wipe the characteristic optical fiber region with alcohol to achieve cleaning. Other cleaning methods can also be used, and specific limitations are not imposed here.

[0054] Preferably, in the above method for stripping cladding light based on polarization-maintaining optical fiber, in step S120: The arrangement pattern processing of the characteristic optical fiber region to form light leakage holes when the characteristic image is displayed on the characteristic optical fiber region specifically includes:

[0055] Step S1201: When the characteristic optical fiber region is immersed in a predetermined medium; adjust the posture of the characteristic optical fiber region so that the characteristic image is displayed. Further, the predetermined medium is glycerol. Specifically, it includes:

[0056] Step S12011: When the characteristic optical fiber region is immersed in glycerol, observe the current posture of the characteristic optical fiber region through a microscope;

[0057] Step S12012: Rotate the characteristic optical fiber region until the characteristic image is displayed. The characteristic image is six straight lines symmetric with each other with the core central axis as the axis of symmetry.

[0058] Step S1202: When the characteristic image is displayed, evacuate the predetermined medium so that the characteristic optical fiber region is exposed, and perform pattern processing on the first surface and the second surface of the characteristic optical fiber region respectively to form light leakage holes. Further, evacuating the predetermined medium so that the characteristic optical fiber region is exposed, and performing pattern processing on the first surface and the second surface of the characteristic optical fiber region respectively to form light leakage holes includes:

[0059] As Figure 2 shown, in step S12021: When six straight lines symmetric with each other with the core central axis as the axis of symmetry are displayed, remove the glycerol and the characteristic optical fiber region is completely exposed, and clean the optical fiber characteristic region;

[0060] Step S12022: When the laser focused beam is normally incident on the characteristic optical fiber region, perform photolithography drilling on the first predetermined position of the characteristic optical fiber region through the laser to form the first light leakage hole;

[0061] Step S12023: Rotate the characteristic optical fiber region by 180°, and when the laser focused beam is normally incident on the characteristic optical fiber region, perform photolithography drilling on the second predetermined position of the characteristic optical fiber region through the laser to form the second light leakage hole.

[0062] List a specific embodiment:

[0063] The following takes NufernPLMA-GDF-20 / 400-M as an example to explain the double-clad Panda Eye polarization-maintaining fiber cladding stripping method.

[0064] Step S21, cut 2 meters of double-clad panda eye polarization-maintaining optical fiber, strip off the coating layer of about 80 mm in the middle of the optical fiber; wipe the stripped coating layer clean with alcohol, as shown in the following figure: Figure 4 ;

[0065] Step S22: Straighten both ends of the optical fiber and fix them on the fixture. Place the glycerin lamp fixture so that the bare fiber with the coating removed is immersed in glycerin. Turn on the LED light on the glycerin fixture and observe the bare fiber under a microscope. Rotate the optical fiber. When six symmetrical lines appear on the bare fiber under the microscope (as shown in the figure), Figure 5 Stop rotating the optical fiber, fix the optical fiber, remove the glycerin lamp, and gently wipe the bare fiber clean with alcohol.

[0066] Step S23: Remove the microscope and adjust the CO2 laser focusing head so that the focused beam is incident on the bare fiber. Figure 6 Turn on the laser and make two rows of holes on the bare fiber. Pay attention to fine-tuning the laser focus position so that the laser holes do not exceed the stress area of the double-clad panda eye fiber. The effect is as shown below. Figure 7 shown.

[0067] Step S24: rotate the optical fiber 180 degrees and drill two rows of holes symmetrically on the bare optical fiber opposite to the holes drilled in step S23. Pay attention to fine-tuning the laser focus position so that the laser holes do not exceed the stress zone of the double-clad panda eye fiber.

[0068] After processing the optical fiber through the above steps, the PLMA-GDF-20 / 400-M optical fiber stripper is completed. Signal light and pump light are introduced to test the effect:

[0069] Comparison of stripping efficiency test data Figure 8 As shown in the figure, the extinction ratio test data of 20W and 50W signal light under the same stripping efficiency are compared. Figure 9 The comparison of the light spot test data of 20W signal light output under the same stripping efficiency is shown in the figure. Figure 10 shown.

[0070] The test data above demonstrates that the spot shape and stripping efficiency of the inventive method are essentially comparable to those of conventional stripping methods. However, the extinction ratio of the inventive method significantly outperforms conventional stripping methods. This indicates that the inventive double-clad panda-eye cladding light stripping method does not damage the optical fiber's stress-zone structure, ensuring a high extinction ratio for the transmitted light while also efficiently stripping residual pump light and higher-order modes from the cladding.

[0071] Rotate the optical fiber under the microscope to locate the position of the panda eye stress area, then avoid the stress area and perform punching lithography on the cladding of the panda optical fiber, so as to realize the function of stripping the cladding light without damaging the stress area of the polarization maintaining fiber, and at the same time ensure the high extinction ratio characteristic of the fiber transmission. In addition, this cladding light treatment method is suitable for high power.

[0072] Embodiment 2

[0073] On the other hand, the present invention further provides a polarization maintaining fiber, which includes a cladding light stripping structure provided at the end of the polarization maintaining fiber, and the cladding light stripping structure is formed by the method for stripping cladding light of a polarization maintaining fiber according to any one of the above.

[0074] For the polarization maintaining fiber provided in this embodiment, its working principle is the same as that of the stripper formed by the above-mentioned method for stripping cladding light of a polarization maintaining fiber in the application of stripping cladding light, which will not be elaborated here.

[0075] It should be noted that in this article, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0076] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for stripping cladding light based on polarization-maintaining fiber, characterized in that: In the state of obtaining a predetermined polarization-maintaining optical fiber, a characteristic optical fiber region matching a first predetermined size is obtained on the predetermined polarization-maintaining optical fiber; Performing an arranged patterning process on the characteristic optical fiber region to form light leakage holes in the state of displaying a characteristic image on the characteristic optical fiber region specifically includes: In the state of immersing the characteristic optical fiber region in a predetermined medium; adjusting the posture of the characteristic optical fiber region so that the characteristic image is displayed; In the state of displaying a characteristic image on the characteristic optical fiber region, performing an arranged patterning process on the characteristic optical fiber region to form light leakage holes; evacuating the predetermined medium to expose the characteristic optical fiber region, and performing patterning processes on the first surface and the second surface of the characteristic optical fiber region respectively to form light leakage holes; In the state where a laser focused beam is normally incident on the characteristic optical fiber region, performing photolithographic drilling on the first surface of the characteristic optical fiber region through the laser to form a first light leakage hole; Rotating the characteristic optical fiber region by 180°, in the state where a laser focused beam is normally incident on the characteristic optical fiber region, performing photolithographic drilling on the second surface of the characteristic optical fiber region through the laser to form a second light leakage hole; The light leakage holes are located at both ends of the stress region of the polarization-maintaining optical fiber; The patterning process forms at least one row of equally spaced light leakage holes, and the light leakage holes are arranged at equal intervals so that the cladding light is gradually scattered out; When the cladding light is transmitted to the optical fiber region with light leakage holes, the equally spaced light leakage holes destroy the total internal reflection condition of the cladding, causing the cladding light to scatter out of the photolithographic processing region; When the cladding light continues to be transmitted in the state where it is not completely scattered in the first light leakage hole, it is gradually scattered when encountering the second and third light leakage holes. When the transmission distance of the cladding light reaches more than 50 mm, the stripping rate of the cladding light reaches 99%.

2. The method for stripping cladding light based on polarization-maintaining fiber according to claim 1, wherein: In the state of obtaining a predetermined polarization-maintaining optical fiber, obtaining a characteristic optical fiber matching a first predetermined size on the predetermined polarization-maintaining optical fiber specifically includes: In the state of obtaining a polarization-maintaining panda-eye type optical fiber with a length of not less than 0.3 m, performing a stripping process on the coating layer of the polarization-maintaining panda-eye type optical fiber so that the cladding with a first predetermined size of the polarization-maintaining panda-eye type optical fiber is exposed; Among them, the region where the cladding is exposed forms the characteristic optical fiber region, and the length of the first predetermined size is not less than 50 mm and not greater than the diameter of the encapsulation glass tube of the polarization-maintaining optical fiber.

3. The method for stripping cladding light based on polarization-maintaining fiber according to claim 2, wherein, Before performing the arranged patterning process on the characteristic optical fiber region to form light leakage holes in the state of displaying a characteristic image on the characteristic optical fiber region, it further includes: Performing a cleaning process on the characteristic optical fiber region.

4. A method for stripping cladding light based on polarization-maintaining fiber according to claim 3, characterized in that Wiping the characteristic optical fiber region with alcohol to achieve the cleaning process.

5. A method for stripping cladding light based on polarization-maintaining optical fiber according to claim 1, characterized in that, The predetermined medium is glycerol.

6. A method for cladding light stripping based on polarization-maintaining optical fiber according to claim 1, characterized in that, In the state of immersing the characteristic optical fiber region in a predetermined medium; adjusting the posture of the characteristic optical fiber region so that the characteristic image is displayed specifically includes: In the state of immersing the characteristic optical fiber region in glycerol, observing the current posture of the characteristic optical fiber region through a microscope; Rotating the characteristic optical fiber region until the characteristic image is displayed, and the characteristic image is six straight lines that are symmetric with respect to the central axis of the fiber core.

7. A method for stripping cladding light based on polarization-maintaining fiber according to claim 6, characterized in that With the characteristic image being displayed, evacuate the predetermined medium to expose the characteristic optical fiber region, and perform patterning on the first surface and the second surface of the characteristic optical fiber region to form light leakage holes, which specifically includes: With six straight lines that are symmetric with each other about the core central axis being displayed, expose the characteristic optical fiber region and perform a cleaning process on the characteristic optical fiber region.

8. A polarization-maintaining optical fiber, characterized in that, It includes providing a cladding light stripping structure at the end of the polarization-maintaining optical fiber, and the cladding light stripping structure is formed by a method for stripping cladding light based on a polarization-maintaining optical fiber according to any one of claims 1 to 7.

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