Polarization maintaining multi-core fiber feedthrough assembly

Abstract

The present application belongs to the technical field of optical fiber penetration, and particularly relates to a polarization maintaining multi-core optical fiber feedthrough assembly, which comprises a flange, a plurality of glass tubes are assembled in the flange, polarization maintaining optical fibers are penetrated in the glass tubes, two sides of the flange are respectively set as an A side and a B side, the A side is an outside cavity side, and the B side is an inside cavity side; an optical cable and an outside cavity sleeve are sleeved on one end of the polarization maintaining optical fiber on the outside cavity side, one end of the outside cavity sleeve covers one end of the optical cable, and the other end is assembled with the flange; an inside cavity sleeve and a rubber sheath are sleeved on one end of the polarization maintaining optical fiber on the inside cavity side. The polarization maintaining multi-core optical fiber feedthrough assembly in the technical scheme is externally provided with a protection mechanism, so that the optical fiber feedthrough assembly itself has a protection capability, the influence of force generated by an external environment and plug-in cooperation on the optical fiber feedthrough assembly is reduced, that is, the polarization maintaining optical fiber is kept in a relatively stable environment, so that the influence on an extinction ratio is reduced, the extinction ratio is kept at a high level, and high requirement use scenarios are met.

Description

Technical Field

[0001] This invention belongs to the field of optical fiber transmission technology, and particularly relates to a polarization-maintaining multi-core optical fiber feedthrough component. Background Technology

[0002] An optical fiber feedthrough assembly is a device used to transmit and connect optical signals in an optical fiber system. Its main function is to transmit optical signals between different parts of the optical fiber system while protecting the optical fiber from the influence of the external environment.

[0003] Polarization-maintaining optical fibers (PSFFs) transmit linearly polarized light and are widely used in various sectors of the national economy, including aerospace, aviation, marine, industrial manufacturing, and communications. The extinction ratio of PSFF is a crucial parameter for evaluating the quality of its optical signal under different polarization states. The extinction ratio reflects the fiber's ability to retain a specific polarization state during transmission; a higher extinction ratio indicates a stronger ability to maintain the polarization state.

[0004] Existing fiber optic feedthrough components on the market suffer from low extinction ratios in polarization-maintaining products, which cannot meet the requirements of demanding application scenarios.

[0005] To address the above issues, a polarization-maintaining multi-core fiber feedthrough component was designed. Summary of the Invention

[0006] To address the problems in the prior art, the present invention proposes the following technical solution:

[0007] A polarization-maintaining multi-core fiber feedthrough assembly includes a flange, in which a plurality of glass tubes are assembled, and a polarization-maintaining fiber passes through the glass tubes. The two sides of the flange are respectively designated as side A and side B, with side A being the outer side of the cavity and side B being the inner side of the cavity.

[0008] The polarization-maintaining fiber is fitted with an optical cable and a cavity outer sleeve at one end outside the cavity. One end of the cavity outer sleeve covers one end of the optical cable, and the other end is assembled with a flange. A spring is fitted on the area of ​​the optical cable not covered by the cavity outer sleeve.

[0009] The polarization-maintaining fiber is fitted with an inner sleeve and a rubber sheath at one end inside the cavity. One end of the inner sleeve is covered by the rubber sheath, and the other end is assembled with a flange.

[0010] The optical cable, the spring, the outer sleeve, and the flange constitute the outer cavity protection component of the polarization-maintaining optical fiber, while the rubber sheath, the inner cavity sleeve, and the flange constitute the inner cavity protection component of the polarization-maintaining optical fiber.

[0011] As a preferred embodiment of the above technical solution, it further includes screw one and screw two. The end of the cavity outer sleeve that is assembled with the flange extends radially outward to form a side plate A. Screw one penetrates the side plate A and is threaded into the flange. The cavity outer sleeve, screw one, and flange form a circumferential anti-rotation component on the outer side of the cavity of the polarization-maintaining fiber.

[0012] The end of the inner sleeve and the flange are assembled and extend radially outward to form a side plate B. The second screw penetrates the side plate B and is threaded into the flange. The inner sleeve, the second screw and the flange form the inner circumferential anti-rotation component of the polarization-maintaining fiber.

[0013] As a preferred embodiment of the above technical solution, the flange is provided with a plurality of transverse stepped holes, and a plurality of glass tubes are respectively assembled inside the plurality of stepped holes, with the glass tubes abutting against the stepped walls of the stepped holes.

[0014] As a preferred embodiment of the above technical solution, each polarization-maintaining optical fiber is fitted with an outer sheath inside the cavity outer sleeve, and the outer sheath is connected to the optical cable.

[0015] Each polarization-maintaining fiber is fitted with an inner and outer cavity sheath at a section inside the cavity sleeve, with the inner and outer cavity sheaths extending to the outside of the rubber sheath.

[0016] As a preferred embodiment of the above technical solution, multiple outer sheaths are fitted with the same outer branching block, the multiple outer sheaths do not contact each other, and the outer branching block is assembled inside the outer sleeve of the cavity.

[0017] Multiple inner and outer sheaths are fitted with the same inner cavity dividing block, and the multiple inner and outer sheaths do not contact each other. The inner cavity dividing block is assembled inside the inner cavity sleeve.

[0018] External and internal branch blocks support the polarization-maintaining fiber, and the portions of the polarization-maintaining fiber located outside the cavity, inside the flange, and inside the cavity are all kept at the same horizontal height.

[0019] As a preferred embodiment of the above technical solution, the optical cable is configured from the inside out as an outer sheath, a spiral armor, an aramid layer, and an outer sheath. The polarization-maintaining optical fiber passes through the outer sheath of the optical cable, and the polarization-maintaining optical fibers do not contact each other when they are located inside the outer sheath of the optical cable.

[0020] As a preferred embodiment of the above technical solution, the glass tube and the polarization-maintaining fiber, and the stepped hole and the glass tube are bonded together with epoxy adhesive.

[0021] As a preferred embodiment of the above technical solution, the end of the outer sleeve covering the optical cable is threaded with a nut, and one end of the nut extends radially inward to form a limiting head;

[0022] The spring has a limiting section, which is limited between the limiting head and the outer sleeve of the cavity;

[0023] The optical cable and the cavity outer sleeve are bonded together.

[0024] As a preferred embodiment of the above technical solution, the inner wall of the cavity sleeve is provided with a limiting step, and the cavity dividing block abuts against the step wall of the limiting step;

[0025] The inner sleeve is bonded to the inner and outer sheaths of the cavity.

[0026] As a preferred embodiment of the above technical solution, a rubber gasket is provided between the outer sleeve of the cavity and the flange, and a through hole is provided in the middle of the rubber gasket, through which the polarization-maintaining optical fiber passes.

[0027] The beneficial effects of this invention are as follows:

[0028] The polarization-maintaining multi-core fiber feedthrough component in this technical solution:

[0029] 1. An external protective mechanism is installed to enable the fiber optic feedthrough assembly to have its own protective capabilities, reducing the impact of the external environment and the forces generated by insertion and removal on the fiber optic feedthrough assembly. In other words, the polarization-maintaining fiber is kept in a relatively stable environment, thereby reducing the impact on the extinction ratio and maintaining the extinction ratio at a high level to meet the requirements of high-demand application scenarios.

[0030] 2. An internal separator is installed to separate the smallest unit consisting of polarization-maintaining fibers and glass tubes, keeping the polarization-maintaining fibers in a state of non-contact. When one polarization-maintaining fiber is subjected to force, the force is first transmitted to the separator to weaken it, and then transmitted to the remaining polarization-maintaining fibers, so that the remaining polarization-maintaining fibers are subjected to less or no force, reducing the mutual influence between the polarization-maintaining fibers, thereby ensuring the extinction ratio of the fiber feedthrough assembly as a whole.

[0031] 3. Connect the external protective mechanism with the internal partition components to form a complete force-bearing unit. When the fiber optic feedthrough component is subjected to local stress, the force is transmitted to each mechanism of the component, dispersing the force. By reducing the difference in local stress, the impact of mechanical stress on the extinction ratio of the entire fiber optic feedthrough component is reduced. Attached Figure Description

[0032] Figure 1 The diagram shown is a schematic diagram of a polarization-maintaining multi-core fiber feedthrough assembly in Embodiment 1;

[0033] Figure 2 The diagram shown is a schematic diagram of the internal structure of a polarization-maintaining multi-core fiber feedthrough assembly in Embodiment 1;

[0034] Figure 3 The diagram shown is a structural schematic of the flange in Embodiment 1;

[0035] Figure A is a three-dimensional structural diagram of the flange; Figure B is a partial sectional view of the flange.

[0036] Figure 4 The diagram shown is a schematic diagram of the external cavity dividing block in Embodiment 1;

[0037] Figure A is a three-dimensional structural diagram of the external cavity dividing block; Figure B is a partial sectional view of the external cavity dividing block.

[0038] Figure 5 The diagram shown is a structural schematic of the inner sleeve in Embodiment 1;

[0039] Figure A is a three-dimensional structural diagram of the inner sleeve; Figure B is a partial cross-sectional view of the inner sleeve.

[0040] Figure 6 The diagram shown is a cross-sectional view of the optical cable in Example 1.

[0041] Reference numerals: 1. Optical cable; 101. Outer sheath of optical cable; 102. Spiral armor; 103. Aramid layer; 104. Outer sheath; 2. Spring; 21. Limiting section; 3. Nut; 31. Limiting head; 4. Outer sleeve of cavity; 41. Side plate A; 5. Screw 1; 6. Flange; 61. Step hole; 7. Inner sleeve of cavity; 71. Side plate B; 72. Limiting step; 8. Screw 2; 9. Inner and outer sheaths of cavity; 10. Inner splitter block of cavity; 11. Glass tube; 12. Polarization maintaining fiber; 13. Outer sheath of cavity; 14. Outer splitter block of cavity; 15. Rubber pad; 16. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0043] Example 1

[0044] like Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown, a polarization-maintaining multi-core fiber feedthrough assembly includes a flange 6, in which a plurality of glass tubes 12 are assembled. In this embodiment, four glass tubes 12 are provided, and a polarization-maintaining fiber 13 passes through the glass tubes 12.

[0045] This technical solution provides a polarization-maintaining multi-core fiber feedthrough assembly. The flange 6 is a CF16 high-vacuum flange, and four glass tubes 12 are embedded inside the flange 6. Polarization-maintaining fibers 13 pass through the glass tubes 12. By combining the high-vacuum flange and multi-core fiber penetration technology, the multi-core usage requirements of small-size flanges in vacuum environments are met. This solves the problem of large flange size when the fiber feedthrough assembly is set to multi-core in the prior art.

[0046] The two sides of the flange 6 are respectively set as side A and side B, side A is the outer side of the cavity and side B is the inner side of the cavity; the polarization maintaining fiber 13 is fitted with optical cable 1 and cavity outer sleeve 4 at one end outside the cavity. One end of cavity outer sleeve 4 covers one end of optical cable 1 and the other end is assembled with flange 6. Spring 2 is fitted in the area of ​​optical cable 1 not covered by cavity outer sleeve 4.

[0047] The polarization-maintaining fiber 13 is fitted with an inner sleeve 7 and a rubber sheath 9 at one end inside the cavity. One end of the inner sleeve 7 is covered by the rubber sheath 9, and the other end is assembled with the flange 6.

[0048] The polarization-maintaining multi-core fiber feedthrough assembly in this technical solution features an external protective mechanism. This mechanism primarily consists of an outer protective component for the polarization-maintaining fiber 13, comprised of optical cable 1, spring 2, cavity outer sleeve 4, and flange 6; and an inner protective component for the polarization-maintaining fiber 13, comprised of rubber sheath 9, cavity inner sleeve 7, and flange 6. Specifically, spring 2 prevents bending of the outer polarization-maintaining fiber 13, while rubber sheath 9 prevents bending of the inner polarization-maintaining fiber 13. The cavity outer sleeve 4 and flange 6 work together to provide tensile and compressive strength to the outer polarization-maintaining fiber 13, and vice versa. For example, when optical cable 1 is subjected to axial tension, it transmits the force to the cavity outer sleeve 4 and flange.

[0049] In this technical solution, the polarization-maintaining multi-core fiber feedthrough assembly is protected in two main ways: 1. Improve the compressive and tensile strength, reducing the force in the axial direction when the fiber feedthrough assembly is plugged in and out; 2. Improve the strength and bending resistance, reducing the impact force, mainly radial force, when the fiber feedthrough assembly is subjected to external impact.

[0050] By enabling the fiber feedthrough assembly to have its own protective capabilities, the impact of external environment and the force generated by insertion and removal on the fiber feedthrough assembly is reduced. That is, the polarization maintaining fiber 13 is kept in a relatively stable environment, thereby reducing the impact on the extinction ratio and keeping the extinction ratio at a high level.

[0051] To further improve the tensile and compressive strength of the fiber optic feedthrough assembly, a polarization-maintaining multi-core fiber optic feedthrough assembly also includes screw 5 and screw 8, as shown below. Figure 1 , Figure 2 As shown, the end of the cavity outer sleeve 4 and the flange 6 are assembled and extend radially outward to form a side plate A41. Screw 5 penetrates the side plate A41 and is threaded into the flange 6. The cavity outer sleeve 4, screw 5 and flange 6 form the circumferential anti-rotation component on the outer side of the cavity of the polarization-maintaining fiber 13.

[0052] like Figure 1 , Figure 2 , Figure 5As shown, the end of the cavity sleeve 7 and the flange 6 are assembled and extend radially outward to form a side plate B71. The screw 8 penetrates the side plate B71 and is threaded into the flange 6. The cavity sleeve 7, the screw 8 and the flange 6 form the cavity side circumferential anti-rotation component of the polarization-maintaining fiber 13.

[0053] In this technical solution, the outer sleeve 4 and the flange 6 are assembled by screw 5, and the inner sleeve 7 and the flange 6 are assembled by screw 8. While meeting the assembly requirements, this improves the axial compressive and tensile strength, making it more suitable for axial stress during insertion and extraction. For example, the outer side of the cavity can meet the tensile strength of 500N and the compressive strength of 1000N / 100mm. At the same time, the screw assembly method makes the outer sleeve 4, screw 5 and flange 6 form the circumferential anti-rotation component on the outer side of the polarization-maintaining fiber 13, and the inner sleeve 7, screw 8 and flange 6 form the circumferential anti-rotation component on the inner side of the polarization-maintaining fiber 13. This can effectively prevent the outer sleeve 4 and the inner sleeve 7 from rotating in the circumferential direction and reduce the stress on the polarization-maintaining fiber 13 in the circumferential direction.

[0054] like Figure 1 , Figure 2 As shown, a rubber gasket 16 is provided between the outer sleeve 4 and the flange 6. A through hole is provided in the middle of the rubber gasket 16. During assembly, the polarization-maintaining fiber 13 passes through the through hole.

[0055] The rubber pad 16 serves several purposes: 1. It prevents screw 5 from loosening, improving the stability of the assembly between the outer sleeve 4 and the flange 6; 2. The deformable nature of the rubber pad 16 fills the gap between the side plate A41 and the flange 6, improving the sealing performance between the outer sleeve 4 and the flange 6, thus meeting the sealing requirements of the fiber optic feedthrough assembly; 3. The rubber material of the rubber pad 16 provides shock absorption when the fiber optic feedthrough assembly is under stress, reducing stress during force transmission and minimizing the impact of mechanical stress on the fiber optic feedthrough assembly in harsh environments, thereby reducing the impact on the extinction ratio; 4. The connection between the outer sleeve 4 and the flange 6 via screw 5 compresses the rubber pad 16, achieving a rainproof function.

[0056] To further reduce the impact on the extinction ratio, a separator is installed inside the fiber feedthrough assembly to separate the smallest unit composed of polarization-maintaining fiber 13 and glass tube 12, as shown below:

[0057] When inside flange 6, such as Figure 2 , Figure 3 As shown, the flange 6 is provided with a number of stepped holes 61 that are transversely penetrating. In this embodiment, four stepped holes 61 are provided to match the glass tubes 12. The multiple glass tubes 12 are respectively assembled inside the multiple stepped holes 61. In order to ensure the stability of the glass tubes 12 when they are assembled inside the stepped holes 61, the glass tubes 12 abut against the stepped wall of the stepped holes 61, limiting the radial and axial positions of the glass tubes 12.

[0058] Multiple glass tubes 12 containing polarization-maintaining fibers 3 are separated by stepped holes 61, so that the polarization-maintaining fibers 3 do not contact each other when they are inside the flange 6; when one polarization-maintaining fiber 3 is subjected to force, the force is weakened by the flange 6 and then transmitted to the other polarization-maintaining fibers 3.

[0059] When outside flange 6, such as Figure 1 , Figure 2 As shown, each polarization-maintaining fiber 13 has an outer sheath 14 covering a section inside the cavity outer sleeve 4, and the outer sheath 14 is connected to the optical cable 1; each polarization-maintaining fiber 13 has an inner and outer sheath 10 covering a section inside the cavity inner sleeve 7, and the inner and outer sheath 10 extends to the outside of the rubber sheath 9.

[0060] When located outside the cavity, the polarization-maintaining fiber 13 is fitted with an outer sheath 14, separating multiple polarization-maintaining fibers 13. When located inside the cavity, the polarization-maintaining fiber 13 is fitted with inner and outer sheaths 10, separating multiple polarization-maintaining fibers 13, ensuring that the polarization-maintaining fibers 13 do not contact each other when located outside the flange 6. The outer sheath 14 and the inner and outer sheaths 10 not only separate the polarization-maintaining fibers 13 but also protect them, reducing the degree of external stress on a single polarization-maintaining fiber 13.

[0061] Furthermore, on the outside of flange 6, such as Figure 2 , Figure 4 As shown, multiple outer sheaths 14 are fitted with the same outer branch block 15, and the multiple outer sheaths 14 do not contact each other. The outer branch block 15 is assembled inside the outer sleeve 4. Multiple inner and outer sheaths 10 are fitted with the same inner branch block 11, and the multiple inner and outer sheaths 10 do not contact each other. The inner branch block 11 is assembled inside the inner sleeve 7.

[0062] When located outside the cavity, the polarization-maintaining fiber 13 is fitted with an external branch block 15 through an external sheath 14. When located inside the cavity, the polarization-maintaining fiber 13 is fitted with an internal branch block 11 through inner and outer sheaths 10. The external branch block 15 and the internal branch block 11 serve to: 1. support the polarization-maintaining fiber 13 and further separate it, ensuring that they do not contact each other.

[0063] 2. When one of the polarization-maintaining fibers 13 is subjected to force, the force is weakened three times and then transmitted to the other polarization-maintaining fibers 13, reducing the impact on the other polarization-maintaining fibers 13. Taking the polarization-maintaining fiber 13 located outside the cavity as an example, when one polarization-maintaining fiber 13 is subjected to force, the force is weakened once by the outer sheath 14 outside the cavity, weakened a second time by the outer splitter block 15 outside the cavity, weakened a third time by the outer sheath 14 outside the cavity on the other polarization-maintaining fibers 13, and then transmitted to the other polarization-maintaining fibers 13.

[0064] 3. The external branching block 15 and the internal branching block 11 support the polarization-maintaining fiber 13, ensuring that the portions of the polarization-maintaining fiber 13 located outside the cavity, inside the flange 6, and inside the cavity are all at the same horizontal level. That is, the polarization-maintaining fiber 13 is kept in a straight line, preventing multiple polarization-maintaining fibers 13 from crossing or bending. This allows the multi-core polarization-maintaining fiber to enter the interior of the outer sheath (inner and outer sheaths 10 and outer outer sheath 14) in a straight line without crossing when the seal penetrates both sides. This reduces the impact of external stress on the polarization-maintaining fiber, improves the extinction ratio, and meets the requirements of high-demand application scenarios.

[0065] Meanwhile, the significance of keeping the polarization-maintaining fiber 13 in a straight state is mainly reflected in reducing optical signal loss, preventing signal distortion, extending fiber life, and ensuring connection stability.

[0066] When used with optical cable 1, such as Figure 1 , Figure 2 , Figure 6 As shown, the optical cable 1 is configured from the inside out as an outer sheath 101, a spiral armor 102, an aramid layer 103, and an outer sheath 104. The polarization-maintaining fiber 13 passes through the outer sheath 101. When the polarization-maintaining fibers 13 are inside the outer sheath 101, they do not contact each other. The portion of the polarization-maintaining fiber 13 extending out of the outer sleeve 4 is separated.

[0067] Meanwhile, in optical cable 1, the outer sheath 104 protects the outer sheath 101, spiral armor 102, and aramid layer 103. When optical cable 1 is subjected to external tension, the aramid layer 103 provides tensile resistance, protecting the polarization-maintaining fiber 13 in the outer sheath 101 from external forces and keeping it in a natural state.

[0068] The polarization-maintaining multi-core fiber feedthrough assembly in this technical solution consists of an internal partitioning component composed of a stepped hole 61, an outer sheath 14, an outer splitter block 15, inner and outer sheaths 10, an inner splitter block 11, and an optical cable 1. This partitioning component separates the smallest unit composed of the polarization-maintaining fiber 13 and the glass tube 12, keeping the polarization-maintaining fibers 13 in a state where they do not contact each other. When one of the polarization-maintaining fibers 13 is subjected to force, the force is first transmitted to the partitioning component to weaken it, and then transmitted to the remaining polarization-maintaining fibers 13, so that the remaining polarization-maintaining fibers 13 are subjected to less or no force, reducing the mutual influence between the polarization-maintaining fibers 13, thereby ensuring the extinction ratio of the fiber feedthrough assembly as a whole.

[0069] To further reduce the impact on the extinction ratio, the external protective mechanism and the internal partition components are connected to form a complete load-bearing unit, as shown below:

[0070] Inside flange 6, such as Figure 2As shown, the glass tube 12 and the polarization-maintaining fiber 13, and the stepped hole 61 and the glass tube 12 are bonded together with epoxy adhesive; thus realizing the connection between the polarization-maintaining fiber 13, the glass tube 12 and the stepped hole 61.

[0071] Meanwhile, the polarization-maintaining fiber 13, glass tube 12, and stepped hole 61 are assembled using epoxy adhesive to ensure the airtightness of the fiber feedthrough assembly, achieving a leakage rate ≤1*E-10Pa·m. 3 The requirement of / s enables stable transmission of 4-channel polarized light signals in a sealed environment, meeting the needs of vacuum environments.

[0072] When outside the cavity, such as Figure 2 As shown, the end of the cavity outer sleeve 4 covering the optical cable 1 is threaded with a nut 3, and one end of the nut 3 extends radially inward to form a limiting head 31; the spring 2 has a limiting section 21; through the threaded engagement between the cavity outer sleeve 4 and the nut 3, the limiting section 21 is limited between the limiting head 31 and the cavity outer sleeve 4, thereby realizing a stable connection between the optical cable 1 and the outside of the cavity outer sleeve 4 through the spring 2.

[0073] The optical cable 1 and the cavity outer sleeve 4 are bonded together to achieve a stable connection between the optical cable 1 and the inside of the cavity outer sleeve 4. When the optical cable 1 is under stress, the stress is distributed through the outside and inside of the cavity outer sleeve 4.

[0074] When inside the cavity, such as Figure 2 , Figure 5 As shown, the inner wall of the inner sleeve 7 is provided with a limiting step 72, and the inner dividing block 11 abuts against the step wall of the limiting step 72, limiting the radial and axial positions of the inner dividing block 11; thus realizing the connection between the inner dividing block 11 and the inner sleeve 7.

[0075] The inner sleeve 7 is bonded to the inner and outer sheaths 10 to achieve a stable connection between the inner sleeve 7 and the inner and outer sheaths 10, while improving the pull-out resistance of the inner and outer sheaths 10.

[0076] The polarization-maintaining multi-core fiber feedthrough assembly in this technical solution connects the external protection mechanism with the internal partitioning mechanism to form a complete force-bearing unit. When the fiber feedthrough assembly is subjected to local stress, the force is transmitted to each mechanism of the assembly, dispersing the force. By reducing the difference in local stress, the impact of mechanical stress on the extinction ratio of the entire fiber feedthrough assembly is reduced.

[0077] For example, when optical cable 1 is under stress, the stress is transmitted externally through spring 2, nut 3, outer sleeve 4, screw 5, and flange 6 in sequence, and internally through outer sheath 14, outer splitter block 15, outer sleeve 4, screw 5, and flange 6 in sequence, or internally through outer sheath 14, glass tube 12, and flange 6 in sequence. When the inner and outer sheaths 10 are under stress, the stress is transmitted externally through rubber sheath 9, inner sleeve 7, screw 8, and flange 6 in sequence, and internally through inner splitter block 11, inner sleeve 7, screw 8, and flange 6 in sequence, or internally through glass tube 12 and flange 6 in sequence.

[0078] The polarization-maintaining multi-core fiber feedthrough assembly in this technical solution has an external protective mechanism, which enables the fiber feedthrough assembly to have its own protective capabilities, reducing the impact of the external environment and the force generated by insertion and removal on the fiber feedthrough assembly. That is, it keeps the polarization-maintaining fiber 13 in a relatively stable environment, thereby reducing the impact on the extinction ratio and achieving the goal of keeping the extinction ratio at a high level.

[0079] 2. An internal separation component is set to separate the smallest unit composed of polarization-maintaining fiber 13 and glass tube 12, so that the polarization-maintaining fiber 13 is kept in a state of not contacting each other. When one of the polarization-maintaining fibers 13 is subjected to force, it is first transmitted to the separation component to weaken the force, and then transmitted to the other polarization-maintaining fibers 13, so that the other polarization-maintaining fibers 13 are subjected to less force or no force, reducing the mutual influence between the polarization-maintaining fibers 13, thereby ensuring the extinction ratio of the fiber feedthrough component as a whole.

[0080] 3. Connect the external protective mechanism with the internal partition components to form a complete force-bearing unit. When the fiber optic feedthrough component is subjected to local stress, the force is transmitted to each mechanism of the component, dispersing the force. By reducing the difference in local stress, the impact of mechanical stress on the extinction ratio of the entire fiber optic feedthrough component is reduced.

[0081] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A polarization-maintaining multi-core fiber feedthrough assembly, comprising a flange (6), wherein a plurality of glass tubes (12) are assembled in the flange (6), and a polarization-maintaining fiber (13) passes through the glass tubes (12), characterized in that, The flange (6) is configured with side A and side B on both sides, with side A being the outer side of the cavity and side B being the inner side of the cavity. The polarization-maintaining fiber (13) is fitted with an optical cable (1) and a cavity outer sleeve (4) at one end outside the cavity. One end of the cavity outer sleeve (4) covers one end of the optical cable (1), and the other end is assembled with a flange (6). A spring (2) is fitted in the area of ​​the optical cable (1) not covered by the cavity outer sleeve (4). The polarization-maintaining fiber (13) is fitted with an inner sleeve (7) and a rubber sheath (9) at one end inside the cavity. One end of the inner sleeve (7) is covered by the rubber sheath (9), and the other end is assembled with a flange (6). The optical cable (1), the spring (2), the cavity outer sleeve (4) and the flange (6) constitute the outer cavity protection component of the polarization-maintaining optical fiber (13), and the rubber sheath (9), the cavity inner sleeve (7) and the flange (6) constitute the inner cavity protection component of the polarization-maintaining optical fiber (13). It also includes screw one (5) and screw two (8). The end of the cavity outer sleeve (4) assembled with the flange (6) extends radially outward to form a side plate A (41). Screw one (5) passes through the side plate A (41) and is threaded into the flange (6). The cavity outer sleeve (4), the screw one (5) and the flange (6) form the circumferential anti-rotation component on the outer side of the cavity of the polarization-maintaining fiber (13). The end of the cavity inner sleeve (7) assembled with the flange (6) extends radially outward to form a side plate B (71). Screw two (8) passes through the side plate B (71) and is threaded into the flange (6). The cavity inner sleeve (7), the screw two (8) and the flange (6) form the circumferential anti-rotation component on the inner side of the cavity of the polarization-maintaining fiber (13). The flange (6) is provided with a number of stepped holes (61) that are transversely penetrating. Multiple glass tubes (12) are respectively assembled inside the multiple stepped holes (61), and the glass tubes (12) abut against the stepped walls of the stepped holes (61). Each polarization-maintaining fiber (13) is fitted with an outer sheath (14) inside the cavity outer sleeve (4) and the outer sheath (14) is connected to the optical cable (1); each polarization-maintaining fiber (13) is fitted with an inner and outer sheath (10) inside the cavity inner sleeve (7) and the inner and outer sheaths (10) extend to the outside of the rubber sheath (9); Multiple outer sheaths (14) are fitted with the same outer splitter block (15), and the multiple outer sheaths (14) do not contact each other. The outer splitter block (15) is assembled inside the outer sleeve (4) of the cavity; multiple inner and outer sheaths (10) are fitted with the same inner splitter block (11), and the multiple inner and outer sheaths (10) do not contact each other. The inner splitter block (11) is assembled inside the inner sleeve (7); the outer splitter block (15) and the inner splitter block (11) support the polarization-maintaining fiber (13). The portion of the polarization-maintaining fiber (13) located outside the cavity, inside the flange (6), and inside the cavity is kept at the same horizontal height; The optical cable (1) is configured from the inside out as an outer sheath (101), a spiral armor (102), an aramid layer (103), and an outer sheath (104). The polarization-maintaining fiber (13) penetrates the outer sheath (101). When the polarization-maintaining fiber (13) is located inside the outer sheath (101), they do not contact each other.

2. The polarization-maintaining multi-core fiber feedthrough assembly according to claim 1, characterized in that, The glass tube (12) and the polarization-maintaining fiber (13), and the stepped hole (61) and the glass tube (12) are bonded together with epoxy adhesive.

3. The polarization-maintaining multi-core fiber feedthrough assembly according to claim 2, characterized in that, The end of the cavity outer sleeve (4) covering the optical cable (1) is threaded with a nut (3), and one end of the nut (3) extends radially inward to form a limiting head (31). The spring (2) has a limiting section (21) that is limited between the limiting head (31) and the outer sleeve (4); The optical cable (1) and the cavity outer sleeve (4) are bonded together.

4. The polarization-maintaining multi-core fiber feedthrough assembly according to claim 3, characterized in that, The inner wall of the cavity sleeve (7) is provided with a limiting step (72), and the cavity dividing block (11) abuts against the step wall of the limiting step (72); The inner sleeve (7) is bonded to the inner and outer sheaths (10).

5. The polarization-maintaining multi-core fiber feedthrough assembly according to claim 1, characterized in that, A rubber pad (16) is provided between the outer sleeve (4) and the flange (6). A through hole is provided in the middle of the rubber pad (16), and the polarization-maintaining fiber (13) passes through the through hole.

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