Optical fiber polarization connector

Abstract

The utility model provides an optical fiber polarization connector, which comprises an optical fiber connection rotating piece, a polarizer and an optical fiber connection fixing piece, the optical fiber connection rotating piece is provided with a first surface and a second surface which are oppositely arranged, the first surface of the optical fiber connection rotating piece is provided with a multimode optical fiber interface, and the second surface is provided with a fixing groove; the polaroid is installed in the fixing groove. The front surface of the optical fiber connection fixing piece is connected with the second surface of the optical fiber connection rotating piece, and the back surface of the optical fiber connection fixing piece is provided with a polarization maintaining optical fiber interface; wherein the optical fiber connection rotating piece can rotate relative to the optical fiber connection fixing piece in the axial direction. According to the utility model, the optical fiber connection rotating member is rotatably connected with the optical fiber connection fixing member, the first surface of the optical fiber connection rotating member is provided with the multimode optical fiber interface, and the back surface of the optical fiber connection fixing member is provided with the polarization maintaining optical fiber interface, so that a collimator and a lens are omitted, the device cost is reduced, and the detection time is shortened; and rapid detection of the elliptic polarization of the dual-frequency laser in the polarization maintaining optical fiber can be realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical fibers and relates to an optical fiber polarization connector. Background Art

[0002] With the development of science and technology, dual-frequency laser interferometry technology has also made rapid progress in the field of precision measurement, while putting forward higher requirements for measurement accuracy and performance. For measurements that require the use of polarization-maintaining fiber to transmit dual-frequency lasers, it is necessary to obtain the polarization ellipticity of the output light from the polarization-maintaining fiber, so as to correct the single-mode coupler to reduce the ellipticity of the output light. In this process, the traditional method is to connect the polarization-maintaining fiber to the collimator, reach the polarizer after the collimator, and then focus on the photodetector through the lens, or couple it into the multimode fiber through the lens, and the multimode fiber is connected to the photodetector. The collimator and lens increase the cost of the device and increase the detection time.

[0003] Therefore, how to provide a fiber polarization connector to reduce device costs and shorten detection time has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a fiber optic polarization connector to solve the problems of high cost of fiber optic polarization connectors and long detection time of dual-frequency laser ellipsometry in the prior art.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a fiber optic polarization connector, comprising:

[0006] The optical fiber connection rotating member has a first surface and a second surface arranged opposite to each other, the first surface of the optical fiber connection rotating member is provided with a multimode optical fiber interface, and the second surface of the optical fiber connection rotating member is provided with a fixing groove;

[0007] A polarizing plate installed in the fixing groove;

[0008] The optical fiber connection fixture has a front side and a back side that are arranged opposite to each other, the front side of the optical fiber connection fixture is connected to the second side of the optical fiber connection rotating member, and the back side of the optical fiber connection fixture is provided with a polarization-maintaining optical fiber interface;

[0009] Wherein, the optical fiber connection rotating member can rotate relative to the optical fiber connection fixing member along the axial direction, and the optical fiber connection rotating member and the optical fiber connection fixing member are detachably connected to each other.

[0010] Optionally, a magnet ring is provided on the front side of the optical fiber connection fixing piece, and the optical fiber connection fixing piece is adsorbed and connected to the optical fiber connection rotating piece through the magnet ring, and the optical fiber connection rotating piece can rotate relative to the optical fiber connection fixing piece when adsorbed and connected.

[0011] Optionally, the optical fiber connection rotating member is provided with a plurality of arc-shaped rotating holes passing through the optical fiber connection rotating member, and the plurality of arc-shaped rotating holes are arranged along a circumferential direction on the periphery of the fixing groove, and the optical fiber connection fixing member is provided with a plurality of fixed threaded holes passing through the optical fiber connection fixing member, and the plurality of fixed threaded holes are arranged along a circumferential direction, wherein, in a direction from the optical fiber connection rotating member to the optical fiber connection fixing member, the projection of the arc-shaped rotating hole covers at least a portion of the projection of the fixed threaded hole.

[0012] Optionally, the number of the arc-shaped rotating holes is two, and the number of the fixed threaded holes is six, wherein in the direction along the optical fiber connection rotating member pointing to the optical fiber connection fixing member, the projection of the arc-shaped rotating hole covers the projections of at least four fixed threaded holes.

[0013] Optionally, the polarization-maintaining optical fiber interface adopts a polarization-maintaining PC optical fiber interface.

[0014] Optionally, the polarization-maintaining optical fiber interface adopts a polarization-maintaining APC optical fiber interface.

[0015] Optionally, the front surface of the optical fiber connection fixture is an inclined surface, and the inclination angle of the inclined surface is 3°-5°.

[0016] Optionally, a glue dispensing hole is provided on the outer side of the fixing groove.

[0017] Optionally, the number of the dispensing holes is four.

[0018] Optionally, the multimode optical fiber interface is connected to a multimode optical fiber, the polarization-maintaining optical fiber interface is connected to a polarization-maintaining optical fiber, and one end of the multimode optical fiber away from the optical fiber connection rotating member is connected to a photodetector.

[0019] As described above, in the optical fiber polarization connector of the utility model, the optical fiber connection rotating member is rotatably connected to the optical fiber connection fixing member, the first side of the optical fiber connection rotating member is provided with a multimode optical fiber interface, and the back side of the optical fiber connection fixing member is provided with a polarization-maintaining optical fiber interface, which eliminates the need for a collimator and a lens, reduces device costs, reduces detection time, and enables rapid detection of the ellipticity of a dual-frequency laser in a polarization-maintaining optical fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Shown is a cross-sectional view of a polarized optical fiber connector according to a first embodiment of the present invention.

[0021] Figure 2 Shown is a schematic diagram of an optical fiber connection rotating member according to a first embodiment of the present utility model.

[0022] Figure 3It is a schematic diagram showing the polarizing plate installed on the optical fiber connecting rotating member in the first embodiment of the present utility model.

[0023] Figure 4 Shown is a schematic diagram of an optical fiber connection fixture according to Embodiment 1 of the present utility model.

[0024] Figure 5 It is a schematic diagram showing that the arc-shaped rotating hole completely covers the fixed threaded hole in the first embodiment of the present invention.

[0025] Figure 6 It is a schematic diagram showing that the arc-shaped rotating hole in the first embodiment of the present invention does not completely cover the fixed threaded hole.

[0026] Figure 7 The present invention is a schematic diagram of installing a polarization-maintaining optical fiber and a multimode optical fiber in an optical fiber polarization connector in a first embodiment of the present invention.

[0027] Figure 8 Shown is a schematic diagram of a dual-frequency laser beam in Embodiment 1 of the present utility model.

[0028] Fig. 9 It is a schematic diagram showing the alignment of the polarization axis of the laser with the fast axis and the slow axis of the polarization-maintaining optical fiber in the first embodiment of the present invention.

[0029] Fig.10 Shown is a schematic diagram of laser polarization ellipsometry in Example 1 of the present utility model.

[0030] Fig.11 Shown is a cross-sectional view of a polarized optical fiber connector according to a second embodiment of the present invention.

[0031] Fig.12 Shown is a schematic diagram of an optical fiber connection fixture according to a second embodiment of the present utility model.

[0032] Fig.13 Shown is a cross-sectional view of an optical fiber connection fixture according to a second embodiment of the present utility model.

[0033] Fig.14 It shows a schematic diagram of installing a polarization-maintaining optical fiber and a multimode optical fiber in an optical fiber polarization connector in the second embodiment of the utility model.

[0034] Fig.15 It is a schematic diagram showing that the outgoing light beam of the dual-frequency laser beam deviates from the optical axis after passing through the polarization-maintaining optical fiber in the second embodiment of the present invention.

[0035] Component number description

[0036] 1 Fiber optic connection rotating part

[0037] 10 Multimode fiber interface

[0038] 11 Fixing slot

[0039] 12 Arc swivel holes

[0040] 2 Polarizers

[0041] 3 Optical fiber connection fixture

[0042] 30 Polarization-maintaining fiber interface

[0043] 31 Magnet ring

[0044] 32 Fixing threaded holes

[0045] 33 Inclined surface

[0046] 4 Multimode Fiber

[0047] 5 Polarization-Maintaining Fiber

[0048] 50 core

[0049] 51 Stress rod

[0050] 52 Fast Axis

[0051] 53 Slow axis

[0052] 54 8 degree slope

[0053] 60 dual frequency laser beams

[0054] 70 Elliptically polarized light

[0055] 80 optical axis

[0056] 81 Optical axis normal DETAILED DESCRIPTION

[0057] The following is an explanation of the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0058] See also Figures 1 to 15 It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the utility model, and the drawings only show the components related to the utility model rather than the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0059] Embodiment 1

[0060] This embodiment provides a fiber polarization connector. Figure 1 The optical fiber polarization connector includes an optical fiber connection rotating member 1, a polarizer 2 and an optical fiber connection fixing member 3. The optical fiber connection rotating member 1 has a first surface and a second surface that are relatively arranged. The first surface of the optical fiber connection rotating member 1 is provided with a multimode optical fiber interface 10, and the second surface of the optical fiber connection rotating member 1 is provided with a fixing groove 11; the polarizer 2 is installed in the fixing groove 11; the optical fiber connection fixing member 3 has a front side and a back side that are relatively arranged. The front side of the optical fiber connection fixing member 3 is connected to the second side of the optical fiber connection rotating member 1, and the back side of the optical fiber connection fixing member 3 is provided with a polarization-maintaining optical fiber structure 30; wherein, the optical fiber connection rotating member 1 can rotate relative to the optical fiber connection fixing member 3 along the axial direction, and the connection is detachable.

[0061] As an example, see Figure 2 , which is a schematic diagram of a fiber optic connection rotating member. In this embodiment, a square fixing groove 11 is provided on the second surface of the fiber optic connection rotating member 1 to assemble a square polarizer 2. In other examples, a circular fixing groove, an elliptical fixing groove or a fixing groove of other shapes may also be provided on the second surface of the fiber optic connection rotating member 1, which is not limited to this embodiment. Four glue dispensing holes are provided at the four corners of the fixing groove 11. Please refer to Figure 3 , which is a schematic diagram showing a polarizer installed on a fiber optic connection rotating member, a square polarizer 2 is installed in a fixing groove 11, and the polarizer 2 is fixed to the fiber optic connection rotating member 1 by setting adhesive in the glue hole. In other examples, circular polarizers, elliptical polarizers, or polarizers of other shapes can also be set according to the shape of the fixing groove 11, and the number of glue holes can be less than four or more than four, which is not limited to the present embodiment.

[0062] As an example, in the direction where the first surface of the optical fiber connection rotating member 1 points to the second surface, a plurality of arc-shaped rotation holes 12 penetrating the optical fiber connection rotating member 1 are provided in the optical fiber connection rotating member 1, and the plurality of arc-shaped rotation holes 12 are located on the periphery of the fixed groove 11 and arranged along the circumferential direction; specifically, in the present embodiment, the number of the arc-shaped rotation holes 12 is two.

[0063] As an example, see Figure 4 , which is a schematic diagram of an optical fiber connection fixture, wherein a magnet ring 31 is provided on the front of the optical fiber connection fixture 3, and the optical fiber connection fixture 3 is adsorbed and connected to the optical fiber connection rotating member 1 through the magnet ring 31, and when adsorbed and connected, the optical fiber connection rotating member 1 can rotate relative to the optical fiber connection fixture 3, thereby driving the polarizer 2 to rotate; wherein, the optical fiber connection rotating member 1 is made of magnetic material, and when adsorbed and connected to the optical fiber connection fixture 3, the magnet connection method can be adjusted more accurately and fixed more stably. In this embodiment, the optical fiber connection fixture 3 adopts a PC optical fiber connection fixture, and the polarization-maintaining optical fiber interface 30 adopts a polarization-maintaining PC optical fiber interface.

[0064] As an example, in the direction from the front side of the optical fiber connection fixture 3 to the back side, a plurality of fixed threaded holes 32 penetrating the optical fiber connection fixture 3 are provided in the optical fiber connection fixture 3, and the plurality of fixed threaded holes 32 are arranged along the circumferential direction on the periphery of the magnet ring 31, wherein, in the direction from the optical fiber connection rotating member 1 to the optical fiber connection fixture 3, the projection of the arc-shaped circular hole 12 covers at least a portion of the projection of the fixed threaded holes 32; specifically, in the present embodiment, the number of the fixed threaded holes 32 is six.

[0065] As an example, see Figure 5 , showing a schematic diagram of an arc-shaped rotating hole completely covering a fixed threaded hole, wherein two arc-shaped rotating holes 12 completely cover six fixed threaded holes 32; see Figure 6 , showing a schematic diagram of an arc-shaped rotating hole not completely covering a fixed threaded hole, wherein two arc-shaped threaded holes 12 cover four fixed threaded holes 32, and the other two fixed screw threaded holes 32 are located between the two arc-shaped rotating holes 12, that is, during the rotation of the optical fiber connection rotating member 1 relative to the optical fiber connection fixing member 3, the arc-shaped rotating hole 12 covers at least four fixed threaded holes 32, and when the optical fiber connection rotating member 1 drives the polarizer 2 to rotate to a preset angle, the bolt passes through the arc-shaped rotating hole 12 and extends into the fixed threaded hole 32, so as to fix the optical fiber connection rotating member 1 to the optical fiber connection fixing member 3. It should be noted that this embodiment only lists the number of arc-shaped rotating holes 12 as two and the number of fixed threaded holes 32 as six, and other numbers of arc-shaped rotating holes 12 and fixed threaded holes 32 can be set according to actual needs, and is not limited to this embodiment.

[0066] As an example, see Figure 7 , which is a schematic diagram showing the installation of polarization-maintaining optical fiber and multimode optical fiber in the optical fiber polarization connector, wherein the polarization-maintaining optical fiber 5 is installed in the polarization-maintaining optical fiber interface 30 of the optical fiber connection fixture 3, and the multimode optical fiber 4 is installed in the multimode optical fiber interface 10 of the optical fiber connection rotating member 1, wherein the other end of the multimode optical fiber 4 is connected to a photodetector, and the dual-frequency laser is transmitted to the polarizer 2 through the polarization-maintaining optical fiber 5, and then transmitted to the multimode optical fiber 4 through the polarizer 2, and detected by the photodetector. In this embodiment, the polarization-maintaining optical fiber 5 adopts a polarization-maintaining PC optical fiber.

[0067] As an example, see Figure 8 , which is a schematic diagram of a dual-frequency laser beam, wherein the dual-frequency laser beam 60 is orthogonally linearly polarized light; please refer to Fig. 9 The polarization-maintaining optical fiber 5 includes a core 50 and two stress rods 51 located on both sides of the core 50, wherein the direction of the connecting line perpendicular to the two stress rods 51 corresponds to the fast axis 52, and the direction of the connecting line of the two stress rods 51 corresponds to the slow axis 53. When the dual-frequency laser beam is aligned with the fast axis 52 and the slow axis 53 of the polarization-maintaining optical fiber 5, the output is orthogonal linear polarized light, and the ellipticity is zero; please refer to Fig.10 When the propagation direction of the dual-frequency laser beam 60 deviates from the fast axis 52 and the slow axis 53 of the polarization-maintaining optical fiber 5, the emitted dual-frequency laser beam is roughly considered to be an orthogonal elliptically polarized light 70. The degree of change from linear polarized light to elliptically polarized light is the ellipticity. The ellipticity can be detected by the polarizer 2 and the photodetector, that is, the relative deviation between the dual-frequency laser beam and the polarization-maintaining optical fiber. The value of the ellipticity is between 0 and 1.

[0068] As an example, rotate the optical fiber connected to the rotating member 1 for one circle and record the minimum value on the photodetector. The smaller the value, the lower the beam ellipticity.

[0069] As an example, after the dual-frequency laser beam passes through the polarization-maintaining optical fiber 5, the output light polarization distribution is uniform and is not affected by the intensity of the light energy. In addition, the multimode optical fiber has a large core diameter, the distance between the polarization-maintaining optical fiber and the multimode optical fiber is short, the light energy loss is less than 20%, and the loss is small. The optical fiber polarization connector does not need to consider the light energy loss.

[0070] As shown above, in the optical fiber polarization connector of this embodiment, the optical fiber connection rotating member is rotatably connected to the optical fiber connection fixing member, a multimode optical fiber interface is provided on the first side of the optical fiber connection rotating member, and a polarization-maintaining optical fiber interface is provided on the back side of the optical fiber connection fixing member, thereby eliminating the need for a collimator and a lens, reducing device costs, reducing detection time, and enabling rapid detection of the ellipticity of a dual-frequency laser in a polarization-maintaining optical fiber.

[0071] Embodiment 2

[0072] This embodiment provides a fiber polarization connector. Fig.11 The optical fiber polarization connector of this embodiment is different from that of the first embodiment in that the optical fiber connection fixture 3 adopts an APC optical fiber connection fixture, and the polarization-maintaining optical fiber interface 30 of the optical fiber connection fixture 3 adopts a polarization-maintaining APC optical fiber interface.

[0073] As an example, the optical fiber connection rotating member 1 is the same as that in the first embodiment and will not be described in detail.

[0074] As an example, see Fig.12 and Fig.13 The front of the optical fiber connection fixture 3 is an inclined surface 33, wherein the extension direction of the polarization-maintaining optical fiber interface 30 of the optical fiber connection fixture 3 is the optical axis 80, and the inclined surface 33 is inclined at an angle of 3°-5° relative to the normal line 81 of the optical axis; the polarization-maintaining optical fiber interface 30 is used to install a polarization-maintaining APC optical fiber.

[0075] As an example, see Fig.14 , which is a schematic diagram of installing polarization-maintaining optical fiber and multimode optical fiber in an optical fiber polarization connector, wherein the multimode optical fiber 4 is installed in the multimode optical fiber interface 10 of the optical fiber connection rotating member 1, and the polarization-maintaining optical fiber 5 is installed in the polarization-maintaining optical fiber interface 30 of the optical fiber connection fixing member 3.

[0076] Specifically, Fig.15 As shown, the polarization-maintaining optical fiber 5 adopts a polarization-maintaining APC optical fiber. One end of the polarization-maintaining optical fiber 5 installed in the polarization-maintaining optical fiber interface 30 is an 8-degree bevel 54. After the dual-frequency laser beam passes through the polarization-maintaining optical fiber 5, the angle δ of the outgoing beam relative to the optical axis is:

[0077] δ=(n-1)α

[0078] Wherein, n is the medium refractive index of the polarization-maintaining optical fiber, n is equal to 1.48, α is the inclination angle of the 8-degree inclined plane, α is equal to 8°, and δ is calculated to be equal to 3.8°. By setting the front surface of the optical fiber connection fixture 3 as the inclined plane 33, the inclined plane 33 can correct the outgoing light of the dual-frequency laser beam after passing through the polarization-maintaining optical fiber 5 to the optical axis, ensuring that the outgoing light of the dual-frequency laser beam after passing through the polarization-maintaining optical fiber 5 is emitted along the optical axis. Preferably, the inclination angle of the inclined plane 33 is preferably 3.8° and 4°.

[0079] As an example, an 8-degree bevel 54 is set at one end of the polarization-maintaining optical fiber 5 installed in the polarization-maintaining optical fiber interface 30 to reduce the reflected light from the end face and reflective surfaces such as the polarizer 2, avoid interference between the reflected light and the emitted light, and increase the accuracy of ellipticity detection.

[0080] In summary, in the optical fiber polarization connector of the utility model, the optical fiber connection rotating member is rotatably connected to the optical fiber connection fixing member, the first surface of the optical fiber connection rotating member is provided with a multimode optical fiber interface, and the back surface of the optical fiber connection fixing member is provided with a polarization-maintaining optical fiber interface, which saves the collimator and lens, reduces the device cost, reduces the detection time, and can realize the rapid detection of the ellipticity of the dual-frequency laser in the polarization-maintaining optical fiber. Therefore, the utility model effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0081] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A fiber polarization connector, characterized in that: include: An optical fiber connection rotating member (1) has a first surface and a second surface arranged opposite to each other, the first surface of the optical fiber connection rotating member (1) is provided with a multimode optical fiber interface (10), and the second surface of the optical fiber connection rotating member (1) is provided with a fixing groove (11); A polarizing plate (2) installed in the fixing groove (11); An optical fiber connection fixing member (3) having a front side and a back side arranged opposite to each other, the front side of the optical fiber connection fixing member (3) being connected to the second side of the optical fiber connection rotating member (1), and the back side of the optical fiber connection fixing member (3) being provided with a polarization-maintaining optical fiber interface (30); The optical fiber connection rotating member (1) is capable of rotating relative to the optical fiber connection fixing member (3) along the axial direction, and the optical fiber connection rotating member (1) and the optical fiber connection fixing member (3) are detachably connected to each other.

2. The optical fiber polarization connector according to claim 1, characterized in that: A magnet ring (31) is provided on the front side of the optical fiber connection fixing member (3), and the optical fiber connection fixing member (3) is adsorbed and connected to the optical fiber connection rotating member (1) via the magnet ring (31), and when the optical fiber connection rotating member (1) is adsorbed and connected, the optical fiber connection rotating member (1) can rotate relative to the optical fiber connection fixing member (3).

3. The optical fiber polarization connector according to claim 2, characterized in that: The optical fiber connection rotating member (1) is provided with a plurality of arc-shaped rotating holes (12) penetrating the optical fiber connection rotating member (1), and the plurality of arc-shaped rotating holes (12) are arranged along the circumferential direction on the periphery of the fixing groove (11); the optical fiber connection fixing member (3) is provided with a plurality of fixing threaded holes (32) penetrating the optical fiber connection fixing member (3), and the plurality of fixing threaded holes (32) are arranged along the circumferential direction, wherein, in a direction from the optical fiber connection rotating member (1) to the optical fiber connection fixing member (3), the projection of the arc-shaped rotating hole (12) covers at least a portion of the projection of the fixing threaded hole (32).

4. The optical fiber polarization connector according to claim 3, characterized in that: The number of the arc-shaped rotating holes (12) is two, and the number of the fixed threaded holes (32) is six, wherein, in the direction from the optical fiber connection rotating member (1) to the optical fiber connection fixing member (3), the projection of the arc-shaped rotating hole (12) covers the projections of at least four of the fixed threaded holes (32).

5. The optical fiber polarization connector according to claim 1, characterized in that: The polarization-maintaining optical fiber interface (30) adopts a polarization-maintaining PC optical fiber interface.

6. The optical fiber polarization connector according to claim 1, characterized in that: The polarization-maintaining optical fiber interface (30) adopts a polarization-maintaining APC optical fiber interface.

7. The optical fiber polarization connector according to claim 6, characterized in that: The front face of the optical fiber connection fixture (3) is an inclined surface (33), and the inclination angle of the inclined surface (33) is 3°-5°.

8. The optical fiber polarization connector according to claim 1, characterized in that: The outer side of the fixing groove (11) is provided with a glue dispensing hole.

9. The optical fiber polarization connector according to claim 8, characterized in that: The number of the dispensing holes is four.

10. The optical fiber polarization connector according to claim 1, characterized in that: The multimode optical fiber interface (10) is connected to a multimode optical fiber (4), the polarization-maintaining optical fiber interface (30) is connected to a polarization-maintaining optical fiber (5), and one end of the multimode optical fiber (4) away from the optical fiber connection rotating member (1) is connected to a photoelectric detector.

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