CN220820296U - Polarization maintaining fiber array with high extinction ratio - Google Patents
Polarization maintaining fiber array with high extinction ratio Download PDFInfo
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- CN220820296U CN220820296U CN202322563287.6U CN202322563287U CN220820296U CN 220820296 U CN220820296 U CN 220820296U CN 202322563287 U CN202322563287 U CN 202322563287U CN 220820296 U CN220820296 U CN 220820296U
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- polarization maintaining
- optical fiber
- extinction ratio
- maintaining optical
- high extinction
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Abstract
The utility model discloses a polarization maintaining fiber array with high extinction ratio, which is characterized by comprising the following components: the polarization maintaining optical fiber is arranged on the main body, a limiting groove for limiting the position of the polarization maintaining optical fiber is formed in the main body, a cover plate is arranged on the upper cover of the limiting groove, the outer edge of the polarization maintaining optical fiber is tangent to the inner sides of the limiting groove and the cover plate, and a polaroid is attached to the end face of the polarization maintaining optical fiber; by the mode, the method and the device can reduce the angle error requirement of the polarization axis in the production process, reduce the production difficulty and improve the product yield.
Description
Technical Field
The utility model relates to the field of optical fiber communication, in particular to a polarization maintaining optical fiber array with high extinction ratio.
Background
The polarization maintaining optical fiber can maintain the polarization state of light beam propagation, has strong environment interference resistance, and is widely applied to the polarization-related fields such as optical fiber sensors, communication systems, optical devices, optical fiber lasers and the like; polarization maintaining fibers are used as pigtails for many devices in communication systems, including semiconductor lasers, erbium-doped fiber amplifiers, and raman amplifiers. The ultra-long distance coherent module in the data center optical module and CPO photoelectric co-sealing application scenes are all used for a large number of polarization maintaining fiber arrays.
The high-precision polarization-maintaining fiber array in the high-speed coherent optical module is used for coherent detection and polarized light transmission, and the polarization-maintaining capability is emphasized because the transmission speeds of different polarization states are different at a higher transmission speed, and when two signals are combined at a receiving end, pulse stretching phenomenon is generated, intersymbol interference is caused, so that signal distortion is caused, and therefore, the manufacturing precision requirement of the polarization-maintaining fiber array is very high.
The bottleneck which restricts the expansion of the application range and the improvement of the performance of the polarization-maintaining optical fiber array at present is mainly lower precision when a plurality of optical fibers are assembled to form the array, and larger accumulated errors of the angles of the polarization axes are easy to generate when a plurality of devices are used in series, so that the system performance is influenced.
Disclosure of utility model
The utility model mainly solves the technical problem of providing the polarization maintaining optical fiber array with high extinction ratio, which can reduce the angle error requirement of a polarization axis in the production process, reduce the production difficulty and improve the product yield.
In order to solve the technical problems, the utility model adopts a technical scheme that: there is provided a polarization maintaining optical fiber array with a high extinction ratio, comprising: the polarization maintaining optical fiber is arranged on the main body, a limiting groove for limiting the position of the polarization maintaining optical fiber is formed in the main body, a cover plate is arranged on the upper cover of the limiting groove, the outer edge of the polarization maintaining optical fiber is tangent to the inner sides of the limiting groove and the cover plate, and a polaroid is attached to the end face of the polarization maintaining optical fiber.
Preferably, the main body comprises a first step part for supporting the polarization maintaining optical fiber without the stripping coating layer and a second step part matched with the polarization maintaining optical fiber after the stripping coating layer, and the limit groove is formed on the upper surface of the second step part.
Preferably, the second step portion and the first step portion are over-buffered at an angle of 45 °.
Preferably, the limit groove is a V-shaped groove or a U-shaped groove matched with the polarization maintaining optical fiber after the coating layer is stripped.
Preferably, glue for wrapping the polarization maintaining optical fiber is arranged on the first step part.
Preferably, a chamfer for avoiding damaging the coating layer is arranged at one end of the cover plate, which is close to the first step part.
Preferably, the polarizer is provided with a marking groove.
Preferably, the cover plate is transparent glass or frosted glass.
Preferably, the body is made of quartz, pyrex or silicon material.
The beneficial effects of the utility model are as follows:
The polarization maintaining optical fiber array end face is adhered with the polaroid for polarization, so that extinction ratio parameters in the coupling process, such as 25dB of extinction ratio of a polarized light input end, are effectively improved, the extinction ratio is polarized again after the polaroid with the same polarization direction is passed, the extinction ratio of the polaroid in a communication wave band can reach more than 50dB, the system coupling extinction ratio of the polarization maintaining optical fiber in a limiting groove with a slow axis angle within 3 DEG is more than 25dB (the system coupling extinction ratio can also reach more than 20dB at an angle of 5.5 DEG), the product parameter performance is effectively improved, and the hidden danger of poor system extinction ratio caused by angle errors is reduced.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a polarization maintaining fiber array with high extinction ratio according to the present utility model;
FIG. 2 is a schematic diagram showing the positional relationship between the polarization maintaining fiber and the main body of a polarization maintaining fiber array with high extinction ratio according to the present utility model;
FIG. 3 is a schematic diagram of a cover plate of a polarization maintaining fiber array with high extinction ratio according to the present utility model;
FIG. 4 is a schematic diagram of a limiting groove structure of a polarization maintaining fiber array with high extinction ratio according to the present utility model;
FIG. 5 is a schematic diagram showing the angle between the slow axis of a polarization maintaining fiber array with high extinction ratio and a target reference line.
The components in the drawings are marked as follows:
1. A main body; 11. a first step portion; 12. a second step portion; 2. polarization maintaining optical fiber; 3. a limit groove;
4. A cover plate; 41. chamfering; 5. glue; 6. a polarizing plate; 61. the grooves are identified.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.
In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Physical quantities in the formulas, unless otherwise noted, are understood to be basic quantities of basic units of the international system of units, or derived quantities derived from the basic quantities by mathematical operations such as multiplication, division, differentiation, or integration.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Examples:
Referring to fig. 1 and 5, a polarization maintaining fiber array with a high extinction ratio includes: the fiber core comprises a main body 1, wherein a plurality of polarization maintaining fibers 2 are arranged on the main body 1, the polarization maintaining fibers 2 are panda polarization maintaining fibers (stress type polarization maintaining fibers), and stress bars on two sides of the fiber core provide compressive stress in X/Y axial directions so as to generate stress birefringence; the stress bar connecting line direction is the slow axis direction of the polarization maintaining optical fiber 2, and the direction perpendicular to the stress bar connecting line direction is the fast axis direction of the polarization maintaining optical fiber 2.
Referring to fig. 1-4, a limiting groove 3 for limiting the position of the polarization maintaining fiber 2 is formed in the main body 1, a cover plate 4 is arranged on the upper cover of the limiting groove 3, the outer edge of the polarization maintaining fiber 2 from which the coating is stripped is tangent to the inner side of the limiting groove 3 and one side of the cover plate 4 close to the main body 1, the limiting groove 3 is a V-shaped groove or a U-shaped groove matched with the polarization maintaining fiber 2 from which the coating is stripped, namely, the polarization maintaining fiber 2 from which the coating is stripped, the inclined walls on two sides of the limiting groove 3 and the cover plate 4 form three-point tangent positions, so that the stability of the position of the polarization maintaining fiber 2 on the main body 1 is ensured, a polarizer 6 is attached to the end face of the polarization maintaining fiber 2, the polarizer 6 is made of glass light transmitting materials allowing light rays with the same polarization directions to pass, and the polarizer 6 is attached to the end face of the array of the polarization maintaining fiber 2 for polarization maintaining, and extinction ratio parameters in the coupling process can be effectively improved. If the extinction ratio of the polarized light input end is 25dB, the extinction ratio is polarized again after passing through the polaroid 6 with the same polarization direction, and the extinction ratio of the polaroid 6 can reach more than 50dB in a communication band;
By stripping part of the coating layer on the polarization maintaining optical fiber 2, the influence of factors such as inconsistent coating layer sizes on the position accuracy of the polarization maintaining optical fiber 2 on the limiting groove 3 can be reduced, and the position of the fiber core of the polarization maintaining optical fiber 2 on the limiting groove 3 is more accurate.
Referring to fig. 1 to 4, a body 1 includes a first stepped portion 11 for supporting an uncoated polarization maintaining optical fiber 2 and a second stepped portion 12 mated with the stripped polarization maintaining optical fiber 2, a limiting groove 3 is opened on an upper surface of the second stepped portion 12, an angle of 45 ° is excessively buffered between the second stepped portion 12 and the first stepped portion 11, i.e., a height of an upper surface of the second stepped portion 12 is higher than a height of an upper surface of the first stepped portion 11, so that the stripped polarization maintaining optical fiber 2 is placed in the limiting groove 3 on the second stepped portion 12, the uncoated polarization maintaining optical fiber 2 is positioned on the first stepped portion 11, in order to fix a position of the polarization maintaining optical fiber 2 on the body 1 and in order to protect the polarization maintaining optical fiber 2, the glue 5 wrapping the polarization-maintaining optical fiber 2 is arranged on the first step part 11, after the glue 5 wraps the polarization-maintaining optical fiber 2, the glue 5 is still in a flowable liquid state, then the glue 5 is cured by using UV, then secondary heat curing is performed in a gradient baking mode, for example, the baking is performed for 2 hours at 65 ℃, then the baking is performed for 12 hours at 115 ℃, then the baking is performed for 2 hours at 85 ℃, then the baking is performed for 1 hour at 65 ℃, and finally the baking is performed for 1 hour at 25 ℃, so that the polarization-maintaining optical fiber 2 is fixed on the main body 1 and the polarization-maintaining optical fiber 2 is protected, and the fiber stripping step of the polarization-maintaining optical fiber 2 is preferably positioned at the center of the first step part 11;
and grinding and polishing the cured semi-finished product of the polarization-maintaining optical fiber 2 array according to a preset light-emitting angle, and fixing the polaroid 6 on the end face of the polarization-maintaining optical fiber 2 by using glue 5, so that the polarization-maintaining optical fiber 2 array with high extinction ratio is manufactured.
Referring to fig. 3, a chamfer 41 for avoiding damage to the cladding layer is provided at one end of the cover plate 4 near the first step portion 11, so as to reduce the relative acting force between the cladding layer and the step portion of the cover plate 4 to avoid damage to the cladding layer when the polarization maintaining optical fiber 2 twists.
The polarizer 6 is typically two brands of polarizer 6, corning and HOYA, in the communications field, with an extinction ratio of up to 50dB; a marking groove 61 is cut on one side of the surface of the polaroid 6 according to the polarization direction of the array of the polarization maintaining optical fibers 2, so that the polaroid is identified, and the direction of the marking groove 61 is consistent with the polarization direction allowed to pass through the polaroid 6; the identical side view light-transmitting surface of the identification groove 61 of the polaroid 6 is plated with an AR antireflection film with preset wavelength to reduce Fresnel reflection and improve the coupling efficiency of the system;
Referring to fig. 1, the parallel tolerance between the polarization direction of the polarizer 6 and the edge line of the identification groove 61 is less than or equal to 0.5 degrees, and the polarizer is horizontally attached to the light-passing surface of the polarization-maintaining optical fiber 2 array and fixed by adopting optical glue 5 with matched refractive indexes.
Referring to fig. 1, the cover plate 4 is transparent glass or frosted glass, and the body 1 is made of quartz, heat-resistant glass or silicon material.
The operation process comprises the following steps: cutting the polarization maintaining optical fibers 2 according to a preset length, stripping the coating layer of the polarization maintaining optical fibers 2 by using hot stripping fibers, penetrating the polarization maintaining optical fibers 2 into the middle of the limiting groove 3 and the cover plate 4 on an assembly tool in sequence, rotating the optical fibers according to a target reference line set by a CCD high-definition display to enable the included angles between the slow axes of the polarization maintaining optical fibers 2 and the target reference line to be smaller than 3 degrees, and exposing and curing with UV glue 5. And grinding and polishing the cured semi-finished product according to a preset light-emitting angle, and fixing the polaroid 6 on the end face of the polarization-preserving fiber 2 by using glue 5, so that the polarization-preserving fiber 2 array with high extinction ratio is manufactured.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.
Claims (9)
1. A high extinction ratio polarization maintaining fiber array, comprising: the novel polarization maintaining optical fiber device comprises a main body (1), wherein a polarization maintaining optical fiber (2) is arranged on the main body (1), a limiting groove (3) for limiting the position of the polarization maintaining optical fiber (2) is formed in the main body (1), a cover plate (4) is arranged on the upper cover of the limiting groove (3), the outer edge of the polarization maintaining optical fiber (2) is tangent to the inner sides of the limiting groove (3) and the cover plate (4), and a polaroid (6) is attached to the end face of the polarization maintaining optical fiber (2).
2. The high extinction ratio polarization maintaining fiber array according to claim 1, wherein: the main body (1) comprises a first step part (11) for supporting the polarization maintaining optical fiber (2) without the stripping coating layer and a second step part (12) matched with the polarization maintaining optical fiber (2) after the stripping coating layer, and the limit groove (3) is formed on the upper surface of the second step part (12).
3. A high extinction ratio polarization maintaining fiber array as recited in claim 2, wherein: an angle of 45 degrees is excessively buffered between the second step part (12) and the first step part (11).
4. A high extinction ratio polarization maintaining fiber array as recited in claim 2, wherein: the limit groove (3) is a V-shaped groove or a U-shaped groove matched with the polarization maintaining optical fiber (2) after the coating layer is stripped.
5. A high extinction ratio polarization maintaining fiber array according to claim 2 or 3, wherein: glue (5) wrapping the polarization maintaining optical fiber (2) is arranged on the first step part (11).
6. A high extinction ratio polarization maintaining fiber array according to claim 2 or 4, wherein: one end of the cover plate (4) close to the first step part (11) is provided with a chamfer (41) for avoiding damaging the coating layer.
7. A high extinction ratio polarization maintaining fiber array according to claim 1 or 2, wherein: the polaroid (6) is provided with a marking groove (61).
8. A high extinction ratio polarization maintaining fiber array according to any one of claims 1-4, wherein: the cover plate (4) is made of transparent glass or ground glass.
9. A high extinction ratio polarization maintaining fiber array according to any one of claims 1-4, wherein: the body (1) is made of quartz, heat-resistant glass or a silicon material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322563287.6U CN220820296U (en) | 2023-09-21 | 2023-09-21 | Polarization maintaining fiber array with high extinction ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322563287.6U CN220820296U (en) | 2023-09-21 | 2023-09-21 | Polarization maintaining fiber array with high extinction ratio |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220820296U true CN220820296U (en) | 2024-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322563287.6U Active CN220820296U (en) | 2023-09-21 | 2023-09-21 | Polarization maintaining fiber array with high extinction ratio |
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| Country | Link |
|---|---|
| CN (1) | CN220820296U (en) |
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2023
- 2023-09-21 CN CN202322563287.6U patent/CN220820296U/en active Active
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