Polarization-maintaining multi-core optical fiber feed-through assembly

Abstract

The invention belongs to the technical field of optical fiber penetration, and particularly relates to a polarization-maintaining multi-core optical fiber feed-through assembly which comprises a flange, a plurality of glass tubes are assembled in the flange, polarization-maintaining optical fibers penetrate through the glass tubes, the two sides of the flange are arranged to be an A side and a B side respectively, the A side is the outer side of a cavity, and the B side is the inner side of the cavity; one end of the extra-cavity sleeve covers one end part of the optical cable, and the other end of the extra-cavity sleeve is assembled with the flange; and one end of the polarization maintaining optical fiber positioned on the inner side of the cavity is sleeved with an intra-cavity sleeve and a rubber sheath. According to the polarization-maintaining multi-core optical fiber feed-through assembly in the technical scheme, the protection mechanism is arranged outside the polarization-maintaining multi-core optical fiber feed-through assembly, so that the optical fiber feed-through assembly has a protection capability, and the influence on the optical fiber feed-through assembly caused by an external environment and a force generated by plugging and unplugging cooperation is reduced, namely, the polarization-maintaining optical fiber is kept in a relatively stable environment, so that the influence on the extinction ratio is reduced, and the service life of the polarization-maintaining multi-core optical fiber feed-through assembly is prolonged. The extinction ratio is kept in a high horizontal state, and the high-requirement use scene is met.

Description

Technical Field

[0001] The invention belongs to the technical field of optical fiber penetration, and in particular relates to a polarization-maintaining multi-core optical fiber feed-through component. Background Art

[0002] Fiber feedthrough assembly is a device used to realize the transmission and connection of optical signals in fiber optic systems. Its main function is to transmit optical signals between different parts of the fiber optic system while protecting the optical fiber from the influence of the external environment.

[0003] Polarization-maintaining optical fiber transmits linearly polarized light and is widely used in various fields of the national economy, such as aerospace, aviation, navigation, industrial manufacturing technology, and communications. The extinction ratio of polarization-maintaining optical fiber is an important parameter for evaluating the quality of its optical signal under polarization state. The extinction ratio reflects the ability of the optical fiber to retain a specific polarization state during transmission. The higher the extinction ratio, the stronger the optical fiber's ability to maintain the polarization state.

[0004] Similar fiber feed-through components currently available on the market have the problem of low extinction ratio of polarization-maintaining products and cannot meet the needs of high-demand usage scenarios.

[0005] In view of the above problems, a polarization-maintaining multi-core optical fiber feed-through component is designed. Summary of the invention

[0006] The present invention aims at solving the problems in the prior art and proposes the following technical solutions:

[0007] A polarization-maintaining multi-core optical fiber feedthrough assembly comprises a flange, wherein a plurality of glass tubes are mounted in the flange, wherein polarization-maintaining optical fibers are passed through the glass tubes, and two sides of the flange are respectively arranged as an A side and a B side, wherein the A side is outside the cavity and the B side is inside the cavity;

[0008] One end of the polarization-maintaining optical fiber located outside the cavity is sheathed with an optical cable and an outer sleeve of the cavity, one end of the outer sleeve of the cavity covers one end of the optical cable, and the other end is assembled with a flange, and the area of ​​the optical cable not covered by the outer sleeve of the cavity is sheathed with a spring;

[0009] An end of the polarization-maintaining optical fiber located inside the cavity is sleeved with an intracavity sleeve and a rubber sheath, one end of the intracavity sleeve is covered by the rubber sheath, and the other end is assembled with a flange;

[0010] The optical cable, the spring, the outer cavity sleeve and the flange constitute the outer cavity protection component of the polarization-maintaining optical fiber, and 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 1 and screw 2, the end of the cavity outer sleeve and the flange assembly radially extends outward to form a side plate A, the screw 1 penetrates the side plate A and cooperates with the flange thread, and the cavity outer sleeve, the screw 1 and the flange form a circumferential anti-rotation part outside the cavity of the polarization-maintaining optical fiber;

[0012] The end of the inner cavity sleeve and the flange assembled extends radially outward to form a side plate B, the second screw passes through the side plate B and cooperates with the flange thread, and the inner cavity sleeve, the second screw and the flange form a circumferential anti-rotation part inside the cavity of the polarization-maintaining optical fiber.

[0013] As a preferred embodiment of the above technical solution, the flange is provided with a plurality of step holes which penetrate transversely, and a plurality of glass tubes are respectively assembled inside the plurality of step holes, and the glass tubes are in conflict with the step walls of the step holes.

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

[0015] A section of each polarization-maintaining optical fiber located inside the intracavity sleeve is sheathed with an inner and outer cavity sheath, and the inner and outer cavity sheaths extend to the outside of the rubber sheath.

[0016] As a preferred embodiment of the above technical solution, the plurality of extracavity outer sheaths are provided with the same extracavity wiring block, the plurality of extracavity outer sheaths are not in contact with each other, and the extracavity wiring block is assembled inside the extracavity sleeve;

[0017] The plurality of inner and outer cavity sheaths are provided with the same inner cavity wiring block, the plurality of inner and outer cavity sheaths are not in contact with each other, and the inner cavity wiring block is assembled inside the inner cavity sleeve;

[0018] The outer-cavity branching block and the inner-cavity branching block support the polarization-maintaining optical fiber, and the parts of the polarization-maintaining optical fiber located outside the cavity, inside the flange, and inside the cavity are all kept at the same level.

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

[0020] As a preferred embodiment of the above technical solution, the glass tube and the polarization-maintaining optical fiber, and the step hole and the glass tube are bonded by epoxy glue.

[0021] As a preferred embodiment of the above technical solution, the end of the cavity outer sleeve covering the optical cable is threadedly matched 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 defined between the limiting head and the outer sleeve of the cavity;

[0023] The optical cable is bonded to the outer sleeve of the cavity.

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

[0025] The intracavity sleeve is bonded to the intracavity and extracavity sheaths.

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

[0027] The beneficial effects of the present invention are:

[0028] Polarization-maintaining multi-core fiber feedthrough assembly in this technical solution:

[0029] 1. A protective mechanism is set up externally so that the fiber feedthrough assembly itself has protection capabilities, reducing the impact of the external environment and the force generated by plug-in matching on the fiber feedthrough assembly, that is, keeping the polarization-maintaining fiber in a relatively stable environment, thereby reducing the impact on the extinction ratio and achieving a high level of extinction ratio to meet high-demand usage scenarios.

[0030] 2. A partition component is set inside to separate the smallest unit composed of the polarization-maintaining fiber and the glass tube, so that the polarization-maintaining fibers remain in a state of not contacting each other. When one of the polarization-maintaining fibers is subjected to force, the force is first transmitted to the partition component to weaken it, and then transmitted to the remaining polarization-maintaining fibers, so that the remaining polarization-maintaining fibers are less stressed or not stressed, 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 and the internal partition component to form a complete force-bearing whole. When the fiber feedthrough component is locally stressed, the force is transmitted to each mechanism of the component to disperse the force. By reducing the difference in local stress, the influence of mechanical stress on the extinction ratio of the entire fiber feedthrough component is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The structure diagram of a polarization-maintaining multi-core optical fiber feed-through assembly in Example 1 is shown;

[0033] Figure 2 The figure shows a schematic diagram of the internal structure of a polarization-maintaining multi-core optical fiber feed-through assembly in Example 1;

[0034] Figure 3 Shown is a schematic diagram of the structure of the flange in Example 1;

[0035] Among them, Figure A is a schematic diagram of the three-dimensional structure of the flange; Figure B is a schematic diagram of the partial cross-sectional structure of the flange;

[0036] Figure 4 It shows the structure schematic diagram of the extracavity line distribution block in Example 1;

[0037] Figure A is a schematic diagram of the three-dimensional structure of the extracavity branching block; Figure B is a schematic diagram of the partial cross-sectional structure of the extracavity branching block;

[0038] Figure 5 The structure diagram of the inner sleeve in the embodiment 1 is shown;

[0039] Figure A is a schematic diagram of the three-dimensional structure of the intracavitary sleeve; Figure B is a schematic diagram of the partial cross-sectional structure of the intracavitary sleeve;

[0040] Figure 6 Shown is a schematic cross-sectional view of the optical cable in Example 1.

[0041] Figure numerals: optical cable 1; optical cable outer sheath 101; spiral armor 102; aramid layer 103; outer skin 104; spring 2; limiting section 21; nut 3; limiting head 31; outer sleeve 4; side panel A41; screw 1 5; flange 6; step hole 61; inner sleeve 7; side panel B71; limiting step 72; screw 2 8; rubber sheath 9; inner and outer sheaths 10; inner-cavity junction block 11; glass tube 12; polarization-maintaining optical fiber 13; outer sheath outside the cavity 14; outer-cavity junction block 15; rubber pad 16. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution 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 optical fiber feedthrough assembly includes a flange 6 in which a plurality of glass tubes 12 are mounted. In this embodiment, four glass tubes 12 are provided, and polarization-maintaining optical fibers 13 penetrate through the glass tubes 12 .

[0045] The technical solution provides a polarization-maintaining multi-core optical fiber feedthrough assembly, wherein the flange 6 is a CF16 high vacuum flange, four glass tubes 12 are embedded in the flange 6, and polarization-maintaining optical fibers 13 are passed through the glass tubes 12. The high vacuum flange and multi-core optical fiber penetration technology are combined to meet the multi-core use requirements of a small-size flange vacuum environment; and the problem of large flange size when the optical fiber feedthrough assembly is set to be multi-core is solved in the prior art.

[0046] The two sides of the flange 6 are respectively set as the A side and the B side, the A side is the outside of the cavity, and the B side is the inside of the cavity; the end of the polarization-maintaining optical fiber 13 located outside the cavity is sleeved with the optical cable 1 and the cavity outer sleeve 4, one end of the cavity outer sleeve 4 covers one end of the optical cable 1, and the other end is assembled with the flange 6, and the area of ​​the optical cable 1 not covered by the cavity outer sleeve 4 is sleeved with a spring 2;

[0047] One end of the polarization-maintaining optical fiber 13 located inside the cavity is sleeved with an intracavity sleeve 7 and a rubber sheath 9 . One end of the intracavity 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 optical fiber feed-through assembly in the present technical solution is provided with a protective mechanism on the outside, which is mainly manifested in that the optical cable 1, the spring 2, the outer sleeve 4 and the flange 6 constitute the outer cavity protective component of the polarization-maintaining optical fiber 13, and the rubber sheath 9, the inner sleeve 7 and the flange 6 constitute the inner cavity protective component of the polarization-maintaining optical fiber 13. Among them, the spring 2 has a bending-proof effect on the polarization-maintaining optical fiber 13 outside the cavity, and the rubber sheath 9 has a bending-proof effect on the polarization-maintaining optical fiber 13 inside the cavity; the outer sleeve 4 and the flange 6 cooperate to make the polarization-maintaining optical fiber 13 outside the cavity have the effect of resisting tension and compression, and the inner sleeve 7 and the flange 6 cooperate to make the polarization-maintaining optical fiber 13 inside the cavity have the effect of resisting tension and compression; for example, when the optical cable 1 is subjected to axial tension, the optical cable 1 transmits the force to the outer sleeve 4 and the flange.

[0049] In this technical solution, the polarization-maintaining multi-core optical fiber feed-through assembly is mainly protected in two aspects: 1. Improving the compression and tensile resistance to reduce the force in the axial direction when the optical fiber feed-through assembly is plugged in and out; 2. Improving the strength and bending resistance to reduce the impact force mainly in the radial direction when the optical fiber feed-through assembly is subjected to external impact.

[0050] By making the fiber feedthrough assembly itself have protection capabilities, the impact of the external environment and the forces generated by plug-in matching 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 achieving a high level of extinction ratio.

[0051] In order to further improve the tensile and compressive strength of the optical fiber feedthrough assembly, a polarization-maintaining multi-core optical fiber feedthrough assembly further includes a screw 5 and a screw 8, such as Figure 1 , Figure 2 As shown, the end of the cavity outer sleeve 4 and the flange 6 assembled radially extends outward to form a side plate A41, and a screw 5 passes through the side plate A41 and is threadedly matched with the flange 6. The cavity outer sleeve 4, the screw 5 and the flange 6 form a circumferential anti-rotation part outside the cavity of the polarization-maintaining optical fiber 13;

[0052] like Figure 1 , Figure 2 , Figure 5As shown, the end of the inner sleeve 7 and the flange 6 assembled radially extends outward to form a side plate B71, and the second screw 8 passes through the side plate B71 and is threadedly matched with the flange 6. The inner sleeve 7, the second screw 8 and the flange 6 form a circumferential anti-rotation part on the inner side of the cavity of the polarization-maintaining optical fiber 13.

[0053] In the present technical scheme, the outer sleeve 4 and the flange 6 are assembled by screw 1 5, and the inner sleeve 7 and the flange 6 are assembled by screw 2 8. While meeting the assembly requirements, the axial compression and tensile resistance are improved, and it is more adaptable to the axial force conditions during plug-in matching. For example, the outer side of the cavity can meet the tensile resistance of 500N and the compressive resistance of 1000N / 100mm. At the same time, the screw assembly method is adopted, so that the outer sleeve 4, screw 1 5 and flange 6 form a circumferential anti-rotation part on the outer side of the cavity of the polarization-maintaining optical fiber 13, and the inner sleeve 7, screw 2 8 and flange 6 form a circumferential anti-rotation part on the inner side of the cavity of the polarization-maintaining optical fiber 13, which can effectively prevent the outer sleeve 4 and the inner sleeve 7 from rotating in the circumferential direction, and reduce the force condition of the polarization-maintaining optical fiber 13 in the circumferential direction.

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

[0055] The setting of the rubber pad 16, 1. prevents the screw 5 from loosening, and improves the stability of the assembly between the cavity outer sleeve 4 and the flange 6; 2. The rubber pad 16 can be deformed to fill the gap between the side plate A41 and the flange 6, improve the sealing between the cavity outer sleeve 4 and the flange 6, and meet the sealing requirements of the optical fiber feedthrough assembly; 3. The material of the rubber pad 16 is set to be rubber, which has a shock-absorbing effect when the optical fiber feedthrough assembly is subjected to force. During the force transmission process, the force is reduced, and the influence of mechanical stress on the optical fiber feedthrough assembly in harsh environments is reduced, thereby reducing the influence on the extinction ratio; 4. The cavity outer sleeve 4 and the flange 6 are connected and squeezed by the rubber pad 16 through the screw 5 to achieve the function of rain protection.

[0056] In order to further reduce the influence on the extinction ratio, a partition component is provided inside the optical fiber feedthrough component to separate the minimum unit composed of the polarization-maintaining optical fiber 13 and the glass tube 12, as shown in the following:

[0057] When inside flange 6, Figure 2 , Figure 3 As shown, the flange 6 is provided with a plurality of step holes 61 which penetrate transversely. In this embodiment, the step holes 61 are arranged as four to match the glass tubes 12. The plurality of glass tubes 12 are respectively assembled inside the plurality of step holes 61. To ensure the stability of the glass tubes 12 when assembled inside the step holes 61, the glass tubes 12 abut against the step walls of the step holes 61, thereby limiting the radial and axial positions of the glass tubes 12.

[0058] The multiple glass tubes 12 with polarization-maintaining optical fibers 3 arranged inside are separated by step holes 61, so that the polarization-maintaining optical fibers 3 do not contact each other when located inside the flange 6; when a polarization-maintaining optical fiber 3 is subjected to force, the force is weakened by the flange 6 and then transmitted to the remaining polarization-maintaining optical fibers 3.

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

[0060] When located outside the cavity, the polarization-maintaining optical fiber 13 is sheathed with an outer sheath 14 outside the cavity, and multiple polarization-maintaining optical fibers 13 are separated by the outer sheath 14 outside the cavity; when located inside the cavity, the polarization-maintaining optical fiber 13 is sheathed with an inner and outer sheath 10 inside and outside the cavity, and multiple polarization-maintaining optical fibers 13 are separated by the inner and outer sheath 10, so that the polarization-maintaining optical fibers 13 are not in contact with each other when located outside the flange 6. The provision of the outer sheath 14 outside the cavity and the inner and outer sheath 10 not only separates the polarization-maintaining optical fibers 13, but also protects the polarization-maintaining optical fibers 13, thereby reducing the degree of external stress on a single polarization-maintaining optical fiber 13.

[0061] Furthermore, when outside the flange 6, Figure 2 , Figure 4 As shown, multiple extracavitary outer sheaths 14 are sleeved with the same extracavitary wiring block 15, the multiple extracavitary outer sheaths 14 do not contact each other, and the extracavitary wiring block 15 is assembled inside the extracavitary sleeve 4; multiple intracavitary inner and outer sheaths 10 are sleeved with the same intracavitary wiring block 11, the multiple intracavitary inner and outer sheaths 10 do not contact each other, and the intracavitary wiring block 11 is assembled inside the intracavitary sleeve 7.

[0062] When located outside the cavity, the polarization-maintaining optical fiber 13 is sheathed with an outside-cavity branching block 15 through an outside-cavity outer sheath 14, and when located inside the cavity, the polarization-maintaining optical fiber 13 is sheathed with an inside-cavity branching block 11 through an inside-outside-cavity sheath 10. The arrangement of the outside-cavity branching block 15 and the inside-cavity branching block 11, 1. supports the polarization-maintaining optical fiber 13, further separates the polarization-maintaining optical fiber 13, and keeps them in a state of not contacting each other.

[0063] 2. When one of the polarization-maintaining optical fibers 13 is subjected to force, the force is weakened three times before being transmitted to the remaining polarization-maintaining optical fibers 13, thereby reducing the influence on the remaining polarization-maintaining optical fibers 13. Taking the case where the polarization-maintaining optical fiber 13 is located outside the cavity as an example, when one polarization-maintaining optical fiber 13 is subjected to force, the force is weakened once through the extracavity outer sheath 14, transmitted to the extracavity branching block 15 for a second weakening, transmitted to the extracavity outer sheath 14 on the remaining polarization-maintaining optical fibers 13 for a third weakening, and then transmitted to the remaining polarization-maintaining optical fibers 13.

[0064] 3. The extra-cavity branching block 15 and the intra-cavity branching block 11 support the polarization-maintaining optical fiber 13, so that the parts of the polarization-maintaining optical fiber 13 located outside the cavity, inside the flange 6, and inside the cavity are all maintained at the same horizontal height, that is, the polarization-maintaining optical fiber 13 is maintained in a straight line as a whole, and multiple polarization-maintaining optical fibers 13 are prevented from crossing and bending, so that when the multi-core polarization-maintaining optical fiber passes through both sides in a sealed manner, it can enter the interior of the outer sheath (inner and outer sheaths 10 of the cavity, and outer sheath 14 of the cavity) in a straight line without crossing, thereby reducing the influence of external stress on the polarization-maintaining optical fiber, improving the extinction ratio, and meeting high-demand usage scenarios.

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

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

[0067] At the same time, in the optical cable 1, the outer skin layer 104 protects the outer sheath 101, the spiral armor 102, and the aramid layer 103 of the optical cable. When the optical cable 1 is subjected to external tension, the aramid layer 103 plays a tensile role, protecting the polarization-maintaining optical fiber 13 in the outer sheath 101 of the optical cable from being affected by or not affected by external forces and being in a natural state.

[0068] The polarization-maintaining multi-core optical fiber feedthrough assembly in the present technical solution comprises an internal partition assembly consisting of a step hole 61, an extracavity outer sheath 14, an extracavity branching block 15, an intracavity and extracavity sheath 10, an intracavity branching block 11 and an optical cable 1, which separates the smallest unit consisting of the polarization-maintaining optical fiber 13 and the glass tube 12, so that the polarization-maintaining optical fibers 13 are kept in a state of not contacting each other. When one of the polarization-maintaining optical fibers 13 is subjected to force, the force is first transmitted to the partition assembly for weakening, and then transmitted to the remaining polarization-maintaining optical fibers 13, so that the remaining polarization-maintaining optical fibers 13 are less subjected to force or are not subjected to force, thereby reducing the mutual influence between the polarization-maintaining optical fibers 13, thereby ensuring the extinction ratio of the optical fiber feedthrough assembly as a whole.

[0069] In order to further reduce the impact on the extinction ratio, the external protection mechanism is connected with the internal partition component to form a complete force-bearing whole, as shown below:

[0070] Inside flange 6, as Figure 2As shown, the glass tube 12 and the polarization-maintaining optical fiber 13 , and the step hole 61 and the glass tube 12 are bonded by epoxy adhesive, thereby achieving connection among the polarization-maintaining optical fiber 13 , the glass tube 12 and the step hole 61 .

[0071] At the same time, the polarization-maintaining optical fiber 13, the glass tube 12 and the step hole 61 are assembled by epoxy adhesive to ensure the sealing of the optical fiber feedthrough assembly, achieving a leakage rate of ≤1*E-10Pa·m 3 / s requirement, achieving stable transmission of 4-way polarized light signals in a sealed environment, suitable for use in a vacuum environment.

[0072] When outside the cavity, Figure 2 As shown, the end of the cavity outer sleeve 4 covering the optical cable 1 is threadedly matched 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 matching of 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, so that the optical cable 1 is stably connected to the outside of the cavity outer sleeve 4 through the spring 2;

[0073] The optical cable 1 and the outer sleeve 4 are bonded to achieve a stable connection between the optical cable 1 and the inside of the outer sleeve 4. When the optical cable 1 is subjected to force, the force is dispersed through the outside and inside of the outer sleeve 4 respectively.

[0074] When inside the cavity, Figure 2 , Figure 5 As shown, the inner wall of the intracavity sleeve 7 is provided with a limiting step 72, and the intracavity branching block 11 abuts against the step wall of the limiting step 72 to limit the radial and axial positions of the intracavity branching block 11, thereby realizing the connection between the intracavity branching block 11 and the intracavity sleeve 7.

[0075] The intracavity sleeve 7 and the intracavity sheath 10 are bonded to each other, thereby achieving a stable connection between the intracavity sleeve 7 and the intracavity sheath 10 and improving the pull-out resistance of the intracavity sheath 10 .

[0076] The polarization-maintaining multi-core optical fiber feedthrough assembly in the present technical solution connects the external protection mechanism with the internal separation assembly to form a complete force-bearing whole. When the optical fiber feedthrough assembly is subjected to local force, the force is transmitted to each mechanism of the assembly to disperse the force, thereby reducing the difference in local stress and thus reducing the influence of mechanical stress on the extinction ratio of the entire optical fiber feedthrough assembly.

[0077] For example, when the optical cable 1 is subjected to force, the force is transmitted to the outside through the spring 2, nut 3, cavity outer sleeve 4, screw 1 5, and flange 6 in sequence, and to the inside through the cavity outer sleeve 14, cavity outer branching block 15, cavity outer sleeve 4, screw 1 5, and flange 6 in sequence, or to the inside through the cavity outer sleeve 14, glass tube 12, and flange 6 in sequence. When the cavity inner and outer sleeves 10 are subjected to force, the force is transmitted to the outside through the rubber sleeve 9, cavity sleeve 7, screw 2 8, and flange 6 in sequence, and to the inside through the cavity branching block 11, cavity sleeve 7, screw 2 8, and flange 6 in sequence, or to the inside through the glass tube 12 and flange 6 in sequence.

[0078] The polarization-maintaining multi-core fiber feedthrough assembly in the present technical solution has the following advantages: 1. A protective mechanism is arranged on the outside so that the fiber feedthrough assembly itself has a protective capability, thereby reducing the influence of the force generated by the external environment and the plug-in combination on the fiber feedthrough assembly, that is, the polarization-maintaining fiber 13 is kept in a relatively stable environment, thereby reducing the influence on the extinction ratio and achieving the extinction ratio being kept at a relatively high level.

[0079] 2. A partition component is provided inside to separate the minimum unit composed of the polarization-maintaining optical fiber 13 and the glass tube 12, so that the polarization-maintaining optical fibers 13 are kept in a state of not contacting each other. When one of the polarization-maintaining optical fibers 13 is subjected to force, the force is first transmitted to the partition component to weaken it, and then transmitted to the remaining polarization-maintaining optical fibers 13, so that the remaining polarization-maintaining optical fibers 13 are less subjected to force or are not subjected to force, thereby reducing the mutual influence between the polarization-maintaining optical fibers 13, thereby ensuring the extinction ratio of the optical fiber feedthrough assembly as a whole.

[0080] 3. Connect the external protective mechanism and the internal partition component to form a complete force-bearing whole. When the fiber feedthrough component is locally stressed, the force is transmitted to each mechanism of the component to disperse the force. By reducing the difference in local stress, the influence of mechanical stress on the extinction ratio of the entire fiber feedthrough component is reduced.

[0081] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A polarization-maintaining multi-core optical fiber feedthrough assembly, comprising a flange (6), wherein a plurality of glass tubes (12) are mounted in the flange (6), wherein a polarization-maintaining optical fiber (13) passes through the glass tube (12), wherein: The two sides of the flange (6) are respectively arranged 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 end of the polarization-maintaining optical fiber (13) located outside the cavity is sleeved with an optical cable (1) and an outer cavity sleeve (4); one end of the outer cavity sleeve (4) covers one end of the optical cable (1) and the other end is assembled with a flange (6); and a spring (2) is sleeved on the area of ​​the optical cable (1) not covered by the outer cavity sleeve (4); An end of the polarization-maintaining optical fiber (13) located inside the cavity is sleeved with an intracavity sleeve (7) and a rubber sheath (9); one end of the intracavity sleeve (7) is covered by the rubber sheath (9) and the other end is assembled with the flange (6); The optical cable (1), the spring (2), the outer cavity sleeve (4) and the flange (6) constitute an outer cavity protection component of the polarization-maintaining optical fiber (13), and the rubber sheath (9), the inner cavity sleeve (7) and the flange (6) constitute an inner cavity protection component of the polarization-maintaining optical fiber (13).

2. The polarization-maintaining multi-core optical fiber feedthrough assembly according to claim 1, characterized in that: It also includes screw 1 (5) and screw 2 (8), the end of the cavity outer sleeve (4) and the flange (6) are assembled to extend radially outward to form a side plate A (41), the screw 1 (5) passes through the side plate A (41) and is threadedly matched with the flange (6), and the cavity outer sleeve (4), the screw 1 (5) and the flange (6) form a circumferential anti-rotation component outside the cavity of the polarization-maintaining optical fiber (13); The end portion of the intracavity sleeve (7) and the flange (6) assembled therewith extends radially outward to form a side plate B (71); the second screw (8) passes through the side plate B (71) and is threadedly engaged with the flange (6); the intracavity sleeve (7), the second screw (8) and the flange (6) form an intracavity circumferential anti-rotation component of the polarization-maintaining optical fiber (13).

3. The polarization-maintaining multi-core optical fiber feedthrough assembly according to claim 1, characterized in that: The flange (6) is provided with a plurality of stepped holes (61) which penetrate transversely, and a plurality of glass tubes (12) are respectively mounted inside the plurality of stepped holes (61), and the glass tubes (12) are in contact with the stepped walls of the stepped holes (61).

4. The polarization-maintaining multi-core optical fiber feedthrough assembly according to claim 3, characterized in that: A section of each polarization-maintaining optical fiber (13) located inside the cavity outer sleeve (4) is sheathed with an outer sheath (14) outside the cavity, and the outer sheath (14) outside the cavity is connected to the optical cable (1); A section of each polarization-maintaining optical fiber (13) located inside the intracavity sleeve (7) is sheathed with an intracavity inner and outer sheath (10), and the intracavity inner and outer sheath (10) extends to the outside of the rubber sheath (9).

5. The polarization-maintaining multi-core optical fiber feedthrough assembly according to claim 4, characterized in that: The plurality of extracavitary outer sheaths (14) are sleeved with the same extracavitary wiring block (15), the plurality of extracavitary outer sheaths (14) are not in contact with each other, and the extracavitary wiring block (15) is assembled inside the extracavitary sleeve (4); The plurality of the inner and outer cavity sheaths (10) are sleeved with the same inner cavity wiring block (11), the plurality of the inner and outer cavity sheaths (10) are not in contact with each other, and the inner cavity wiring block (11) is assembled inside the inner cavity sleeve (7); The outer cavity branching block (15) and the inner cavity branching block (11) support the polarization-maintaining optical fiber (13), and the parts of the polarization-maintaining optical fiber (13) located outside the cavity, inside the flange (6), and inside the cavity are all maintained at the same horizontal height.

6. The polarization-maintaining multi-core optical fiber feedthrough assembly according to claim 5, characterized in that: The optical cable (1) is sequentially arranged from the inside to the outside to include an optical cable outer sheath (101), a spiral armor (102), an aramid layer (103) and an outer skin layer (104); the polarization-maintaining optical fiber (13) penetrates the optical cable outer sheath (101); and the polarization-maintaining optical fibers (13) do not contact each other when located inside the optical cable outer sheath (101).

7. The polarization-maintaining multi-core optical fiber feedthrough assembly according to claim 5, characterized in that: The glass tube (12) and the polarization-maintaining optical fiber (13), and the step hole (61) and the glass tube (12) are bonded by epoxy adhesive.

8. The polarization-maintaining multi-core optical fiber feedthrough assembly according to claim 7, characterized in that: The end of the cavity outer sleeve (4) covering the optical cable (1) is threadedly matched 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), and the limiting section (21) is limited between the limiting head (31) and the outer sleeve (4) of the cavity; The optical cable (1) and the cavity outer sleeve (4) are bonded together.

9. The polarization-maintaining multi-core optical fiber feedthrough assembly according to claim 8, characterized in that: The inner wall of the intracavity sleeve (7) is provided with a limiting step (72), and the intracavity line dividing block (11) abuts against the step wall of the limiting step (72); The intracavitary sleeve (7) is bonded to the intracavitary and extracavitary sheaths (10).

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

Images