Novel polarization-maintaining optical fiber airtight cabin-penetrating connector

Abstract

The invention discloses a novel polarization-maintaining optical fiber airtight cabin-penetrating connector, which comprises a sealing metal handle, an intra-cavity sealing tube and a polarization-maintaining optical fiber, and is characterized in that the middle part of the sealing metal handle is provided with a coaxially arranged through tube cavity, one end of the through tube cavity is necked, the intra-cavity sealing tube is located in the through tube cavity, and the polarization-maintaining optical fiber is arranged in the through tube cavity. And a filling layer is arranged between the intra-cavity sealing pipe and the penetrating pipe cavity. The sealing metal handle is internally provided with an in-cavity sealing tube which is filled and sealed by a filling material, and the sealing metal handle is matched with multiple sealing of press-fit glue sealing at two ends of the ceramic ferrule and the in-cavity sealing tube in the middle, so that high-reliability air tightness can be ensured, moisture can be effectively prevented from entering the connector, the problem of optical signal attenuation or scattering caused by water vapor is avoided, and the service life of the connector is prolonged. According to the utility model, the stable optical transmission performance is ensured, the internal environment of the connector can be kept dry and stable, and the stress distribution change caused by humidity change is reduced, so that the accuracy of the polarization state is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of polarization-maintaining optical fiber connectors, and in particular relates to a novel polarization-maintaining optical fiber airtight cabin penetration connector. Background Art

[0002] With the rapid development of information technology, modern communication systems have increasingly higher requirements for data transmission rate and reliability. Fiber optic communication technology has gradually become the mainstream due to its wide bandwidth, high speed and excellent anti-interference ability. As a key component in the fiber optic communication system, the fiber optic airtight penetration connector is responsible for the transmission and connection of optical signals. Therefore, with the continuous development of fiber optic communication technology, its application demand is also growing, and it is widely used in aerospace, military communications, industrial control and other fields.

[0003] Polarization-maintaining optical fiber airtight cabin connectors require that the optical fiber has good polarization maintenance performance and high alignment accuracy of the polarization-maintaining working axis. In optical communication transmission applications inside and outside vacuum cavities, the optical fiber airtight cabin connectors currently used mainly adopt epoxy glue filling + O-ring sealing, which has poor water vapor barrier performance. Water vapor can easily enter the connector. The tiny droplets in the water vapor will scatter or absorb light, reducing the optical power transmission efficiency. In addition, water vapor will cause polarization mode dispersion (PMD), that is, light with different polarization directions propagates at different speeds, thereby destroying the originally stable polarization state and affecting the communication quality. Summary of the invention

[0004] The present invention aims to solve the problem that the water vapor barrier performance of the connector in the prior art is poor, water vapor entering will scatter or absorb light, reduce the optical power transmission efficiency and affect the communication quality, and propose the following technical solutions:

[0005] A novel polarization-maintaining optical fiber airtight cabin-penetrating connector, comprising: a sealed metal handle, an intracavity sealing tube and a polarization-maintaining optical fiber, wherein the sealed metal handle is a stepped cylindrical structure, a coaxially arranged through-tube cavity is opened in the middle of the sealed metal handle, one end of the through-tube cavity is necked, the intracavity sealing tube is located in the through-tube cavity, and a filling layer is arranged between the intracavity sealing tube and the through-tube cavity;

[0006] A step structure is provided at the middle and upper part of the outer wall of the intracavity sealing tube, and the inner wall of the through-tube cavity of the sealing metal handle is interference fit with it, and the intracavity sealing tube is pressed into the through-tube cavity to bottom out and limit and fix.

[0007] As a preferred embodiment of the above technical solution, ceramic inserts are inserted at both ends of the sealed metal handle, the intracavity sealing tube is located between the two ceramic inserts, the sealing metal handle and the ceramic inserts are interference fit, and the ceramic inserts are pressed into the sealed metal handle for limited and fixed fit.

[0008] As a preferred embodiment of the above technical solution, one end of the polarization-maintaining optical fiber is movably inserted into the sealing tube in the cavity, and the other end of the polarization-maintaining optical fiber passes through the ceramic ferrule and extends to the outside. The part of the polarization-maintaining optical fiber located in the ceramic ferrule is sealed with filler.

[0009] As a preferred embodiment of the above technical solution, it also includes: a guide key and a sleeve cover, wherein the two ends of the guide key are respectively inserted into the sealing metal handle and the sleeve cover, the surface of the sealing metal handle is provided with an annular groove corresponding to the guide key, and the surface of the sleeve cover is provided with a keyway corresponding to the guide key.

[0010] As a preferred embodiment of the above technical solution, the guide key is installed in the annular groove of the sealed metal handle at any position, and the guide key is fixedly connected to the sealed metal handle by spot welding after adjusting the position of the axis for maintaining the deflection.

[0011] As a preferred embodiment of the above technical solution, the inner wall of the sleeve cover and the outer diameter of the shaft column at both ends of the sealing metal handle are interference fit, and are press-fitted with the sealing metal handle through a fixed guide key and fixedly connected to the sealing metal handle through spot welding.

[0012] As a preferred embodiment of the above technical solution, a ceramic sleeve is arranged inside the sleeve cover, one end of the ceramic sleeve is an open structure, and the ceramic sleeve is sleeved and tightly matched with the surface of the ceramic ferrule.

[0013] The beneficial effects of the present invention are:

[0014] 1. The sealed metal handle is equipped with an inner cavity sealing tube filled with fillers. Combined with the press-fit glue seals at both ends of the ceramic ferrule and the multiple seals of the inner cavity sealing tube itself, it can ensure high reliability and airtightness, effectively prevent moisture from entering the connector, avoid the problem of optical signal attenuation or scattering caused by water vapor, ensure stable optical transmission performance, and keep the internal environment of the connector dry and stable, reducing the stress distribution changes caused by humidity changes, thereby ensuring the accuracy of the polarization state;

[0015] 2. The movable guide key design can meet the requirements of polarization-maintaining optical fiber working axis alignment or arbitrary angle positioning. The alignment accuracy depends on the matching accuracy of each link of the clamping and positioning tooling and the axis alignment method. The axis alignment part only has one assembly and matching, which greatly reduces the matching clearance error and realizes high-precision adjustable alignment in the polarization-maintaining stress zone. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 What is shown is a schematic diagram of the overall structure of an embodiment;

[0017] Figure 2 Shown is a front cross-sectional view of an embodiment;

[0018] Figure 3Shown are schematic diagrams of various parts of the sealing assembly in the embodiment;

[0019] Figure 4 What is shown is a schematic diagram of alignment of the polarization-maintaining stress regions in the embodiment;

[0020] Figure 5 Shown is a schematic diagram of the installation of the guide key in the embodiment.

[0021] In the figure: 10, sealed metal handle; 11, through-tube cavity; 12, annular groove; 20, sealing tube in the cavity; 30, polarization-maintaining optical fiber; 40, ceramic ferrule; 50, guide key; 60, sleeve cover; 61, keyway; 70, ceramic sleeve. DETAILED DESCRIPTION

[0022] 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 and the accompanying drawings of the specification.

[0023] Example

[0024] Figure 1-Figure 4 In the invention, a novel polarization-maintaining optical fiber airtight penetration connector is provided, comprising: a sealed metal handle 10, an intracavity sealing tube 20 and a polarization-maintaining optical fiber 30. The sealed metal handle 10 is a stepped cylindrical structure, a coaxially arranged through-tube cavity 11 is opened in the middle of the sealed metal handle 10, one end of the through-tube cavity 11 is necked, the intracavity sealing tube 20 is located in the through-tube cavity 11, and a filling layer 80 is arranged between the intracavity sealing tube 20 and the through-tube cavity 11;

[0025] A step structure is provided at the middle and upper part of the outer wall of the intracavity sealing tube 20, and the inner wall of the through-tube cavity 11 of the sealing metal handle 10 is interference fit with it, and the intracavity sealing tube 20 is pressed into the through-tube cavity 11 to bottom out and be fixed.

[0026] Ceramic inserts 40 are inserted at both ends of the sealed metal handle 10, and the intracavity sealing tube 20 is located between the two ceramic inserts 40. The sealing metal handle 10 and the ceramic inserts 40 are interference fit at the insertion point, and the ceramic inserts 40 are pressed into the sealed metal handle 10 for limited and fixed fit.

[0027] One end of the polarization-maintaining optical fiber 30 is movably inserted into the cavity sealing tube 20, and the other end of the polarization-maintaining optical fiber 30 passes through the ceramic ferrule 40 and extends to the outside. The part of the polarization-maintaining optical fiber 30 located in the ceramic ferrule 40 is sealed with filler.

[0028] When assembling the connector, first press the cavity sealing tube 20 through the opening of the cavity 11 of the sealing metal handle 10 to make it bottom out and limit, then inject glue into a ceramic ferrule 40 and press it into a hole on one side of the sealing metal handle 10 near the necking end of the cavity, and insert the polarization-maintaining optical fiber 30 with partial protection from the other end. The protection area should cover the part of the polarization-maintaining optical fiber 30 in the middle cavity (the protection method is usually partial gold plating or other equivalent methods), and at the same time ensure that the remaining length allows the end of the polarization-maintaining optical fiber 30 to extend out of the end face of the pressed ferrule. , and the other end group is long enough so that the ceramic ferrule 40 at the other end can also be extended after being press-fitted. After heating and curing, the inner cavity sealing tube 20 and the outer wall of the upper tube of the step of the inner cavity sealing tube 20 are filled and sealed (the filler is selected based on the requirements of low stress and environmental resistance, and can be filled with low-temperature solder for brazing or glass material for low-temperature glass sintering. If there is no requirement for water vapor barrier, it can be directly sealed by glue injection). The sealing assembly consisting of the sealing metal handle 10, the inner cavity sealing tube 20 and the ceramic ferrule 40 is assembled.

[0029] An intracavity sealing tube 20 filled and sealed with a filler is arranged inside the sealed metal handle 10. Combined with the press-fit glue seals at both ends of the ceramic ferrule 40 and the multiple seals of the intracavity sealing tube 20 itself in the middle cavity, high-reliability airtightness can be ensured, which can effectively prevent moisture from entering the interior of the connector, avoid the problem of optical signal attenuation or scattering caused by water vapor, ensure stable optical transmission performance, and also keep the internal environment of the connector dry and stable, reduce the stress distribution changes caused by humidity changes, thereby ensuring the accuracy of the polarization state.

[0030] Figure 1-Figure 5 The invention also includes: a guide key 50 and a sleeve cover 60. The interface of the sleeve cover 60 is FC type, and the interface size meets IEC 61754-13. The two ends of the guide key 50 are respectively inserted into the sealed metal handle 10 and the sleeve cover 60. The surface of the sealed metal handle 10 is provided with an annular groove 12 corresponding to the guide key 50, and the surface of the sleeve cover 60 is provided with a keyway 61 corresponding to the guide key 50.

[0031] The guide key 50 is installed in the annular groove 12 of the sealed metal handle 10 at any position. After the guide key 50 is adjusted to the position by the deflection-maintaining axis alignment work, it is fixedly connected to the sealed metal handle 10 by spot welding.

[0032] The inner wall of the sleeve cover 60 and the outer diameter of the shaft column at both ends of the sealed metal handle 10 are interference fit, and the sealed metal handle 10 is press-fitted through the fixed guide key 50 and fixedly connected to the sealed metal handle 10 by spot welding.

[0033] A ceramic sleeve 70 is disposed inside the sleeve cover 60 . One end of the ceramic sleeve 70 is an open structure. The ceramic sleeve 70 is sleeved and tightly fitted with the surface of the ceramic ferrule 40 .

[0034] After the ceramic ferrule 40 is installed, the ends of the ceramic ferrule 40 at both ends are roughly ground and polished to complete the preparation for the axis alignment. Then, the guide key 50 is installed into the annular groove 12 at one end of the sealing metal handle 10 and clamped and fixed by a tooling clamp. It is necessary to ensure that the sealing component can be tightly attached to the assembly surface of the guide key 50 and rotate along the annular groove 12. The stress zone alignment position is adjusted by rotating the sealing component. The axis alignment is shown in the figure as follows. Figure 4 As shown, the alignment method can be selected by CCD amplifying the image of the core stress area of ​​the polarization-maintaining optical fiber 30 in the middle of the ferrule to match it with the guide key 50, or by docking with the reference polarization-maintaining component and rotating it to the position with the highest extinction ratio to complete the alignment, and then spot welding the guide key 50 and the sealing component at the fitting point, and aligning the other end through the same steps until both ends are aligned and fixed with the guide key 50.

[0035] After the shaft is aligned, the ceramic ferrules 40 at both ends are ground. The guide keys 50 can be used to position the ground into an oblique octave surface. If the ground surface is flat, the guide keys 50 are not needed for positioning. Then, the ceramic sleeves 70 are assembled on the ceramic ferrules 40 at both ends of the sealing assembly, and the sleeve cover 60 is positioned and pressed into place with the fixed guide keys 50. After the press-fitting is completed, the sleeve cover 60 and the sealing assembly are evenly spot welded along the circle to complete the assembly of the optical fiber airtight cabin connector.

[0036] The design of the movable guide key 50 can meet the requirements of working axis alignment or arbitrary angle positioning of the polarization-maintaining optical fiber 30. The alignment accuracy depends on the matching accuracy of the clamping and positioning tooling and the axis alignment method. The axis alignment part only needs one assembly and matching, which greatly reduces the matching clearance error and realizes high-precision adjustable alignment of the polarization-maintaining stress zone. The connector using this device has a simple structure and the docking interface can be expanded and developed according to adaptation requirements, which has great practical and commercial value.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A novel polarization-maintaining optical fiber airtight cabin connector, characterized in that: include: A sealed metal handle (10), an intracavity sealed tube (20) and a polarization-maintaining optical fiber (30), wherein the sealed metal handle (10) is a stepped cylindrical structure, a coaxially arranged through-tube cavity (11) is provided in the middle of the sealed metal handle (10), one end of the through-tube cavity (11) is necked, the intracavity sealed tube (20) is located in the through-tube cavity (11), and a filling layer (80) is provided between the intracavity sealed tube (20) and the through-tube cavity (11); A step structure is provided in the middle and upper part of the outer wall of the intracavitary sealing tube (20), and the inner wall of the through-tube cavity (11) of the sealing metal handle (10) is interference-fitted with the step structure, and the intracavitary sealing tube (20) is pressed into the through-tube cavity (11) to be bottomed and fixed.

2. According to claim 1, a novel polarization-maintaining optical fiber airtight penetration connector is characterized in that: Ceramic inserts (40) are inserted at both ends of the sealing metal handle (10), the intracavity sealing tube (20) is located between the two ceramic inserts (40), an interference fit is formed between the inserting portion of the sealing metal handle (10) and the ceramic insert (40), and the ceramic insert (40) is pressed into the sealing metal handle (10) to perform a limited and fixed fit.

3. According to claim 2, a novel polarization-maintaining optical fiber airtight penetration connector is characterized in that: One end of the polarization-maintaining optical fiber (30) is movably inserted into the cavity sealing tube (20), and the other end of the polarization-maintaining optical fiber (30) passes through the ceramic ferrule (40) and extends to the outside. The part of the polarization-maintaining optical fiber (30) located in the ceramic ferrule (40) is sealed with a filler.

4. According to claim 2, the novel polarization-maintaining optical fiber airtight penetration connector is characterized in that: Also includes: A guide key (50) and a sleeve cover (60), wherein both ends of the guide key (50) are respectively inserted into a sealed metal handle (10) and a sleeve cover (60), a surface of the sealed metal handle (10) is provided with an annular groove (12) corresponding to the guide key (50), and a surface of the sleeve cover (60) is provided with a keyway (61) corresponding to the guide key (50).

5. The novel polarization-maintaining optical fiber airtight penetration connector according to claim 4 is characterized in that: The guide key (50) is inserted into the annular groove (12) of the sealed metal handle (10) at any position. After the guide key (50) is adjusted in position by performing the deflection-maintaining axial alignment operation, it is fixedly connected to the sealed metal handle (10) by spot welding.

6. The novel polarization-maintaining optical fiber airtight penetration connector according to claim 5, characterized in that: The inner wall of the sleeve cover (60) and the outer diameter of the shaft column at both ends of the sealing metal handle (10) are interference fit, and the sealing metal handle (10) is press-fitted with the fixed guide key (50) and fixedly connected with the sealing metal handle (10) by spot welding.

7. The novel polarization-maintaining optical fiber airtight penetration connector according to claim 4 is characterized in that: A ceramic sleeve (70) is arranged inside the sleeve cover (60), one end of the ceramic sleeve (70) is an open structure, and the ceramic sleeve (70) is sleeved on the surface of the ceramic insert (40) and tightly fits therewith.

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