Two-in-one high-power isolator
By combining a dual-fiber collimator, an isolator core, and a single-fiber collimator, and using fusion-spliced expander fiber and a beam-splitting self-focusing lens, the problem of fiber end-face damage in lasers and amplifiers was solved, achieving high power tolerance, compact space, and reduced cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-09
- Publication Date
- 2026-03-17
AI Technical Summary
In existing lasers and amplifiers, the fiber end faces of splitters and isolators are easily damaged by high power, and the space and cost requirements of the equipment have not been effectively addressed.
It employs a combination of dual fiber collimators, isolator cores, and single fiber collimators, using fusion-spliced expanded fiber and self-focusing lens, combined with reflective splitter and transmissive isolator structures to achieve optical signal splitting and isolation functions. It eliminates the need for splitter filter components and uses fusion-spliced expanded fiber and splitter film self-focusing lens.
It improves the power tolerance threshold of optical fiber devices, reduces end-face power density, reduces optical fiber end-face damage, and makes the product more compact and lower in cost.
Smart Images
Figure CN224005307U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lidar technology, specifically a two-in-one high-power isolator. Background Technology
[0002] The optoelectronics industry is currently developing rapidly, with optoelectronic products widely used in communications, medical, automotive, aerospace, and military fields. In any optoelectronic system, light emission and detection are fundamental prerequisites for system operation. To meet the needs of different application areas, higher requirements are being placed on lasers and related optoelectronic devices. The following three aspects are problems that laser and optoelectronic device products must face and solve: First, power issues: to meet the application requirements of fields such as lidar, the output power of lasers and amplifiers is increasing, thus requiring higher power loads from internal optoelectronic devices. Second, space issues: with the gradual miniaturization of optoelectronic equipment, higher requirements are being placed on the size of optoelectronic devices. Third, cost issues: to maintain market competitiveness, cost reduction is a constantly evolving problem.
[0003] Currently, laser equipment such as lasers and amplifiers require low-ratio splitters to extract the monitoring signal for monitoring the output status of the optical signal. Simultaneously, to ensure equipment stability and safety, fiber optic isolators need to be installed at the output end. However, because the optical fiber input and output end faces of splitters and isolators have extremely small spot sizes, they are easily susceptible to high-power damage at the fiber end faces.
[0004] Therefore, there is an urgent need for a laser component that can solve the three major problems of power, space and cost, and avoid high-power damage caused by the fiber end face. Utility Model Content
[0005] To achieve the above objectives, this utility model provides the following technical solution: a two-in-one high-power isolator, comprising:
[0006] A dual-fiber collimator is used for power-based beam splitting and collimation. It includes a fusion-bonded expanding dual fiber, a dual-fiber capillary glass tube, a self-focusing lens, and a first glass sleeve. The two fibers of the fusion-bonded expanding dual fiber are arranged side by side inside the dual-fiber capillary glass tube to form a dual-fiber pigtail. The inclined end of the self-focusing lens is opposite to and fixed together with the inclined surface of the dual-fiber capillary glass tube. The flat end of the self-focusing lens is coated with a beam-splitting film. The first glass sleeve is fitted on the outside of the dual-fiber capillary glass tube.
[0007] The isolator core is a cylindrical optical component that allows forward light to pass through while blocking reverse light;
[0008] A single-fiber collimator includes a fusion-spliced and expanded single fiber, a single-fiber capillary glass tube, a spherical lens, and a second glass sleeve. The fusion-spliced and expanded single fiber is disposed inside the single-fiber capillary glass tube. The inclined end of the spherical lens is opposite to and fixed together with the inclined surface of the single-fiber capillary glass tube. The second glass sleeve is sleeved on the outside of the single-fiber capillary glass tube and the spherical lens.
[0009] The outer glass sleeve encapsulates the dual-fiber collimator, isolator core, and single-fiber collimator sequentially inside, forming a coaxial package.
[0010] Preferably, the two fibers in the fusion-splitter expanded twin fiber are identical, both made by fusion splicing single-mode fiber and coreless fiber, and the end faces of the twin fiber pigtails are polished and coated.
[0011] Preferably, the self-focusing lens is cut to 1 / 5 of the pitch length.
[0012] Preferably, the isolator core includes a ring magnet, two copper bases, and an internal optical crystal. The copper bases are perpendicular to the central axis of the ring magnet and have square through holes. The internal optical crystals include four lithium niobate crystals and two Faraday rotator crystals. One lithium niobate crystal is disposed on each side of the copper base. The lithium niobate crystals have a trapezoidal structure. The two lithium niobate crystals on each side of the copper base are symmetrical about the center point of the copper base. A Faraday rotator crystal is disposed in the square through hole of each copper base. The Faraday rotator crystal has a square structure and is a bismuth-substituted rare earth iron garnet single crystal. The axial magnetic field strength generated by the ring magnet is 800 to 1200 Gauss.
[0013] Preferably, the first glass sleeve, the annular magnet, and the second glass sleeve are bonded to the inside of the outer glass sleeve with adhesive. The fusion-spliced and expanded single optical fiber is bonded inside the single optical fiber capillary glass tube to form a single optical fiber pigtail. The single optical fiber capillary glass tube and the spherical lens are bonded inside the second glass sleeve. The fusion-spliced and expanded dual optical fibers are bonded inside the dual optical fiber capillary glass tube. The self-focusing lens is bonded and fixed to the dual optical fiber capillary glass tube, and the dual optical fiber capillary glass tube is bonded inside the first glass sleeve. The adhesive is a low-temperature UV-sensitive adhesive with a temperature tolerance range of -60℃ to +150℃.
[0014] Preferably, the spherical lens has a radius of curvature of 1.2 mm or 1.42 mm, the end face of the single fiber pigtail is polished and coated, and the distance between the beveled end of the spherical lens and the end face of the single fiber pigtail is 20 μm to 80 μm.
[0015] Preferably, the first glass sleeve, the second glass sleeve, and the outer glass sleeve are borosilicate glass tubes.
[0016] This utility model has the following beneficial effects:
[0017] This device uses a fusion-expanded double fiber pigtail composed of single-mode fiber and coreless fiber fusion expansion and a double fiber capillary glass tube, and a fusion-expanded single fiber pigtail composed of single-mode fiber and coreless fiber fusion expansion and a single fiber capillary glass tube. This achieves a significant increase in the aperture of the fiber end face, thereby reducing the end face power density and greatly improving the power tolerance threshold of the fiber optic device.
[0018] This device uses a combination of dual-fiber collimators, isolator cores, and a single-fiber collimator for matching. This ensures that one fiber in the fusion-split and expanded dual-fiber system serves as the common end for signal transmission, while the other fiber serves as the signal output end meeting a specific splitting ratio. A portion of the light signal transmitted through the dual-fiber collimator passes through the isolator core and is coupled to the single-fiber collimator, outputting from the single-fiber collimator. Conversely, when the single-fiber collimator receives an input light signal, it is backscattered and isolated by the isolator core, resulting in no light signal output from the dual-fiber collimator end. By combining a reflective splitter structure and a transmissive isolator structure, both splitting and isolation functions are achieved within a single fiber device, resulting in a more compact product structure and smaller size.
[0019] For the optical path structure of the splitter, this solution eliminates the conventional splitter filter component and uses a fusion-split expanded double fiber pigtail and a self-focusing lens with a beam-splitting film coating on the end face to form a double fiber collimator. One of the fibers in the fusion-split expanded double fiber is used as the common end for transmitting signals. When all signals pass through the self-focusing lens, the optical signal with a specific power ratio is reflected to the output of the other fiber in the fusion-split expanded double fiber, and the remaining optical signal is converted into a collimated beam and output from the self-focusing lens. By coating the beam-splitting film on the end face of the self-focusing lens of the double fiber collimator, the double fiber collimator can simultaneously perform the functions of collimator and beam splitter, saving the filter component and significantly reducing the product cost. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0021] Figure 2 This is a schematic diagram of the structure of the single-mode optical fiber and the coreless optical fiber in this utility model;
[0022] Figure 3 This is a schematic diagram of the structure of the fusion-bonded and expanded double optical fiber and the double optical fiber capillary glass tube in this utility model;
[0023] Figure 4 This is a schematic diagram of the structure of the fusion-bonded and expanded single optical fiber and the single optical fiber capillary glass tube in this utility model;
[0024] Figure 5 This is a schematic diagram of the structure of the self-focusing lens and the first glass sleeve in this utility model;
[0025] Figure 6This is a schematic diagram of the spherical lens and the second glass sleeve in this utility model;
[0026] Figure 7 This is a schematic diagram of the isolator core in this utility model;
[0027] Figure 8 This is a schematic diagram of the structure of the copper base in this utility model;
[0028] Figure 9 This is a schematic diagram of the lithium niobate crystal in this utility model;
[0029] Figure 10 This is a schematic diagram of the Faraday optical rotator crystal in this invention;
[0030] Figure 11 This is a schematic diagram of the ring magnet in this utility model.
[0031] In the diagram: 1, outer glass sleeve; 2, dual-fiber collimator; 201, fusion-splitter expanded dual fiber; 202, dual-fiber capillary glass tube; 203, self-focusing lens; 204, first glass sleeve; 2011, single-mode fiber; 2012, coreless fiber; 3, isolator core; 301, ring magnet; 302, copper base; 3021, lithium niobate crystal; 3022, Faraday rotator crystal; 4, single-fiber collimator; 401, fusion-splitter expanded single fiber; 402, single-fiber capillary glass tube; 403, spherical lens; 404, second glass sleeve. Detailed Implementation
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.
[0034] Embodiments of this utility model:
[0035] like Figures 1 to 3 , Figure 5 and Figure 7 As shown, this embodiment provides a two-in-one high-power isolator, including an outer glass sleeve 1, a dual-fiber collimator 2, an isolator core 3, and a single-fiber collimator 4. The outer glass sleeve 1 sequentially encapsulates the dual-fiber collimator 2, the isolator core 3, and the single-fiber collimator 4 on its inner side, forming a sealed optical path channel.
[0036] The dual-fiber collimator 2 is used for power-based beam splitting and collimation. It includes a fusion-bonded and expanded dual-fiber 201, a dual-fiber capillary glass tube 202, a self-focusing lens 203, and a first glass sleeve 204. The two fibers of the fusion-bonded and expanded dual-fiber 201 are arranged side-by-side in the capillary of the dual-fiber capillary glass tube 202 to form a dual-fiber pigtail. The inclined end of the self-focusing lens 203 is opposite to and fixed together with the inclined surface of the dual-fiber capillary glass tube 202. The flat end of the self-focusing lens 203 (the end closer to the isolator core 3) is coated with a beam-splitting film. The first glass sleeve 204 is sleeved on the outside of the dual-fiber capillary glass tube 202. The self-focusing lens 203 is located on the side closer to the isolator core 3, and the dual-fiber capillary glass tube 202 is located on the side away from the isolator core 3, sealing and protecting the optical signal transmission path to prevent dust, water vapor, and other contaminants from affecting the optical signal transmission.
[0037] The two fibers in the fusion-splittered and expanded dual-fiber 201 are identical, both formed by fusion splicing a single-mode fiber 2011 and a coreless fiber 2012. The coreless fiber 2012 has no solid or hollow centerline and consists of a cladding and fiber. Light propagates within the fiber. The coreless fiber 2012 is located on one side of the end face of the dual-fiber capillary glass tube 202 (the side of the dual-fiber capillary glass tube 202 closer to the isolator core 3), with a length of 0.2 to 0.4 mm (preferably 0.3 mm), forming a dual-fiber pigtail. The end face of the dual-fiber pigtail (the end face closer to the self-focusing lens 203) is polished and coated. The function of the dual-fiber pigtail is... There are two main purposes. First, it is used to fix the fusion splice expander fiber, facilitating subsequent operations. Because the fusion splice expander fiber is thin and brittle, it is extremely easy to damage and difficult to fix if operated directly. Using the dual-fiber capillary glass tube 202 to fix it makes it easier to perform subsequent operations such as grinding, coating, and adjustment on the fusion splice expander fiber. The second purpose is to fix the relative position of the single-mode fiber 2011 and the coreless fiber 2012, so that the beam properties of the dual-fiber collimator 2 and the single-fiber collimator 4 can be accurately controlled within the required range. This allows for perfect coupling when the dual-fiber collimator 2 is adjusted for reflection later.
[0038] The self-focusing lens 203 is cut to 1 / 5 pitch length because only a shorter lens can achieve beam collimation. The flat end of the self-focusing lens 203 is coated with a beam-splitting film. When a light signal passes through the beam-splitting film, it will be reflected at a certain ratio (0.1%), and the remaining part (99.9%) will be transmitted. The focal point of the self-focusing lens 203 is located on the outer side of the beam splitter layer. The inclined end of the self-focusing lens 203 is opposite to the inclined surface of the dual-fiber capillary glass tube 202. The relative position of the two is adjusted so that when one of the fibers of the fusion-bonded and expanded dual-fiber pigtail has an input optical signal, the optical signal passes through the self-focusing lens 203 and reaches the beam splitter at the lens plane end. The beam splitter reflects part of the optical signal back to the second fiber for output, and the other part of the optical signal is transmitted through the beam splitter and forward transmitted through the isolator core 3 to the spherical surface of the spherical lens 403 to form a collimated beam output. The ratio of transmitted light power to reflected light power is adjustable (adjustable before device packaging; the beam splitting ratio is determined by the beam splitter, and lenses with different beam splitters can be selected according to the beam splitting ratio requirements).
[0039] like Figure 1 , Figures 7 to 11 As shown, the isolator core 3 is a cylindrical optical component that allows forward light to pass through while isolating reverse light. It includes a ring magnet 301, two copper bases 302, and internal optical crystals. The copper bases 302 are perpendicular to the central axis of the ring magnet 301 and have square through-holes. The internal optical crystals include four lithium niobate crystals 3021 and two Faraday crystals 3022. One lithium niobate crystal 3021 is located on each side of the copper base 302. The lithium niobate crystals 3021 have a trapezoidal structure. The two lithium niobate crystals 3021 on each side of the copper base 302 are positioned relative to the center of the copper base 302. The placement of the lithium niobate crystal 3021 is symmetrical around the center (the placement of the lithium niobate crystal 3021 takes into account the transmission characteristics of the optical path, because the lithium niobate crystal 3021 has a wedge-shaped cut; if placed symmetrically, the optical signal cannot be output in parallel, so it is fixed in a rotationally symmetrical manner around the center of the copper base 302). Each square through-hole of the copper base 302 contains a Faraday rotator crystal 3022, which is a square structure and a bismuth-substituted rare-earth iron garnet single crystal (RIG). The axial magnetic field strength generated by the ring magnet 301 is 800 to 1200 Gauss. The function of the isolator core 3 is: when the optical signal is input from the dual-fiber collimator 2 into the isolator core 3, it can pass through almost without loss; when the optical signal is input from the single-fiber collimator 4 into the isolator core 3 in the reverse direction, the signal will be scattered, forming an isolator effect, realizing the function of forward passage and reverse isolation of the optical signal.
[0040] like Figure 1 , Figure 2 , Figure 4 and Figure 6As shown, the single-fiber collimator 4 is used to collimate the beam. It includes a fusion-spliced expanding single fiber 401, a single-fiber capillary glass tube 402, a spherical lens 403, and a second glass sleeve 404. The fusion-spliced expanding single fiber 401 is disposed inside the capillary hole of the single-fiber capillary glass tube 402. The fusion-spliced expanding single fiber 401 is also made by fusing a single-mode fiber 2011 and a coreless fiber 2012. The coreless fiber 2012 is located on one side of the end face of the single-fiber capillary glass tube 402 (the side of the single-fiber capillary glass tube 402 closer to the isolator core 3), forming a single... The fiber optic pigtail has a polished and coated end face (the end face near the spherical lens 403). The beveled end of the spherical lens 403 is opposite to and fixed together with the beveled end of the single fiber capillary glass tube 402. The second glass sleeve 404 is sleeved on the outside of the single fiber capillary glass tube 402 and the spherical lens 403. The spherical lens 403 is located on the side closer to the isolator core 3, and the single fiber capillary glass tube 402 is located on the side away from the isolator core 3, sealing and protecting the optical signal transmission path to prevent dust, water vapor and other contaminants from affecting the optical signal transmission.
[0041] The spherical lens 403 has a radius of curvature of 1.2 mm or 1.42 mm. The end face of the single fiber pigtail is polished and coated. The distance between the beveled end of the spherical lens 403 and the end face of the single fiber pigtail is adjusted to 20 μm to 80 μm by an external fine-tuning mechanism. The beveled end of the spherical lens 403 is opposite to the beveled end of the single fiber capillary glass tube 402. The distance between them is adjusted so that when there is a light signal input as a parallel beam at the spherical end of the spherical lens 403, the signal passes through the spherical lens 403 to the end face of the fusion-spliced and expanded single fiber pigtail and is coupled into the single fiber for output.
[0042] A ring magnet 301 is bonded to the middle position inside the outer glass sleeve 1. The first glass sleeve 204 and the second glass sleeve 404 are bonded to both ends inside the outer glass sleeve 1 with adhesive to fix the relative positions of the dual-fiber collimator 2, the isolator core 3, and the single-fiber collimator 4. The outer glass sleeve 1 facilitates fixation and subsequent operations, and prevents damage to the optical fibers. The fusion-spliced and expanded single optical fiber 401 is bonded inside the single-fiber capillary glass tube 402. The outer surface of the single-fiber capillary glass tube 402 and the spherical lens 403 are bonded to the inner cylindrical surface of the second glass sleeve 404. The fusion-spliced and expanded dual optical fiber 201 is bonded inside the dual-fiber capillary glass tube 202. The self-focusing lens 203 is bonded and fixed to the dual-fiber capillary glass tube 202. The outer surface of the dual-fiber capillary glass tube 202 is bonded to the inner cylindrical surface of the first glass sleeve 204. The adhesive is a low-temperature UV-sensitive adhesive with a temperature tolerance range of -60℃ to +150℃. The first glass sleeve 204, the second glass sleeve 404, and the outer glass sleeve 1 are all borosilicate glass tubes.
[0043] The optical signal processing steps of the dual-in-one high-power isolator provided in this embodiment are as follows:
[0044] Step 1: The input optical signal enters through one of the optical fibers of the fusion-split double fiber 201, and the optical signal reflected by the beam splitter on the self-focusing lens 203 is output from the second optical fiber. The optical signal transmitted through the beam splitter is transmitted in the forward direction to the spherical lens 403 via the isolator core 3.
[0045] Step 2: The spherical lens 403 focuses and couples the collimated beam to the output of the fusion-spliced and expanded single fiber 401.
[0046] In summary, this device uses a fusion-expanded double fiber pigtail consisting of a single-mode fiber 2011 and a coreless fiber 2012, and a dual-fiber capillary glass tube 202. It also uses a fusion-expanded single fiber pigtail consisting of a single-mode fiber 2011 and a coreless fiber 2012, and a single-fiber capillary glass tube 402. This significantly increases the aperture of the fiber pigtail end face, thereby reducing the end face power density and greatly improving the power tolerance threshold of the fiber optic device.
[0047] This device uses a combination of dual-fiber collimators 2, isolator core 3, and single-fiber collimator 4 for matching. This ensures that one fiber of the fusion-spliced and expanded dual-fiber 201 serves as the common end for signal transmission, while the other fiber serves as the signal output end that meets a specific splitting ratio. A portion of the light signal transmitted through the dual-fiber collimator 2 passes through the isolator core 3 and is coupled to the single-fiber collimator 4, outputting from the single-fiber collimator 4. Conversely, when the single-fiber collimator 4 receives an input light signal, the signal is backscattered and isolated by the isolator core 3, resulting in no light signal output from the dual-fiber collimator 2 end. By combining a reflective splitter structure and a transmissive isolator structure, both splitting and isolation functions are achieved within a single fiber device, resulting in a more compact product structure.
[0048] For the optical path structure of the splitter, this solution eliminates the conventional splitter filter component and uses a fusion-split double fiber pigtail and a self-focusing lens 203 with a beam-splitting film coating on the end face to form a double fiber collimator 2. One fiber of the fusion-split double fiber 201 is used as the common end for transmitting signals. When all signals pass through the self-focusing lens 203, the optical signal with a specific power ratio is reflected to the other fiber of the fusion-split double fiber 201 for output, and the remaining optical signal is converted into a collimated beam and output from the self-focusing lens 203. By coating the beam-splitting film on the end face of the self-focusing lens 203 of the double fiber collimator 2, the double fiber collimator 2 can simultaneously perform the functions of collimator and beam splitter, saving the filter component and significantly reducing the product cost.
[0049] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A two-in-one high power isolator characterized in that, The application relates to a glass optical isolator, which comprises the following components: a double-fiber collimator (2) for splitting and collimating a light beam in power, which comprises a fused biconical double-fiber (201), a double-fiber capillary glass tube (202), a self-focusing lens (203) and a first glass sleeve (204), two optical fibers of the fused biconical double-fiber (201) are arranged side by side in the double-fiber capillary glass tube (202) to form a double-fiber pigtail, the inclined end of the self-focusing lens (203) is opposite to the inclined surface of the double-fiber capillary glass tube (202) and is fixed together, the flat end of the self-focusing lens (203) is coated with a light splitting film, and the first glass sleeve (204) is sleeved outside the double-fiber capillary glass tube (202); an isolator core (3) which is a cylindrical optical component and allows forward light to pass through and isolates reverse light; a single-fiber collimator (4) which comprises a fused biconical single-fiber (401), a single-fiber capillary glass tube (402), a spherical lens (403) and a second glass sleeve (404), the fused biconical single-fiber (401) is arranged in the single-fiber capillary glass tube (402), the inclined end of the spherical lens (403) is opposite to the inclined surface of the single-fiber capillary glass tube (402) and is fixed together, and the second glass sleeve (404) is sleeved outside the single-fiber capillary glass tube (402) and the spherical lens (403); an outer glass sleeve (1) which sequentially sleeves the double-fiber collimator (2), the isolator core (3) and the single-fiber collimator (4) on the inside to perform coaxial packaging.
2. The two-in-one high power isolator of claim 1, wherein, The two optical fibers in the fused biconical double-fiber (201) are the same and are both made by fusing a single-mode optical fiber (2011) and a coreless optical fiber (2012), and the end surface of the double-fiber pigtail is polished and coated.
3. The two-in-one high power isolator of claim 1, wherein, The self-focusing lens (203) is cut into a length of 1 / 5 pitch.
4. The two-in-one high power isolator of claim 2, wherein, The isolator core (3) comprises a ring-shaped magnet (301), two copper seats (302) and internal optical crystals, the copper seat (302) is perpendicular to the central axis of the ring-shaped magnet (301), the copper seat (302) is provided with a square through hole, the internal optical crystals comprise four lithium niobate crystals (3021) and two Faraday optical rotation crystals (3022), one lithium niobate crystal (3021) is arranged on each side of the copper seat (302), the lithium niobate crystal (3021) is in a trapezoidal structure, the two lithium niobate crystals (3021) on the two sides of the copper seat (302) are centrosymmetric about the center point of the copper seat (302), one Faraday optical rotation crystal (3022) is arranged in the square through hole of each copper seat (302), the Faraday optical rotation crystal (3022) is in a square structure, the Faraday optical rotation crystal (3022) is a bismuth-substituted rare earth iron garnet single crystal, and the axial magnetic field strength generated by the ring-shaped magnet (301) is 800-1200 Gauss.
5. The two-in-one high power isolator of claim 4, wherein, The first glass sleeve (204), the annular magnet (301) and the second glass sleeve (404) are adhered to the inner side of the outer glass sleeve (1) by adhesive, the fused expanded single fiber (401) is adhered in the single fiber capillary glass tube (402) to form a single fiber pigtail, the single fiber capillary glass tube (402) and the spherical lens (403) are adhered in the second glass sleeve (404), the fused expanded double fiber (201) is adhered in the double fiber capillary glass tube (202), the self-focusing lens (203) is adhered and fixed with the double fiber capillary glass tube (202), and the double fiber capillary glass tube (202) is adhered in the first glass sleeve (204); the adhesive is low-temperature variable UV glue, and the temperature resistance range is -60℃ to +150℃.
6. The two-in-one high power isolator of claim 5, wherein, The radius of curvature of the spherical lens (403) is 1.2mm or 1.42mm, the end face of the single fiber pigtail is polished and coated, and the spacing between the inclined end of the spherical lens (403) and the end face of the single fiber pigtail is 20μm to 80μm.
7. The two-in-one high power isolator of claim 1, wherein, The first glass sleeve (204), the second glass sleeve (404) and the outer glass sleeve (1) are borosilicate glass tubes.