Optical fiber geometric dimension testing device and testing method

Abstract

The invention discloses an optical fiber geometric dimension testing device and testing method. The optical fiber geometric dimension testing device comprises a clamp, a cutting tool, a light source, an objective lens, a camera and a controller. The clamp is used for clamping an optical fiber and approaching a test end of the optical fiber; the cutting tool is located above one side of the clamp, is far away from the test end and is driven by the first driving part to descend to cut the optical fiber to obtain a straight optical fiber sample, and the cutting end of the optical fiber forms an illumination end of the optical fiber sample; the light source is located on one side of the cutting tool, far away from the clamp and driven by the second driving part to move to be close to the illumination end; the objective lens is located on the other side of the clamp and close to the test end; the camera is located on one side of the objective lens, away from the clamp and connected with the controller. After the transmission performance of the optical fiber is tested, the optical fiber does not need to be taken down from a clamp and then cut off, so that the test stability can be improved, the operation process of the optical fiber geometric dimension test is simple, the preparation time before the test is short, and the overall test time is short.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical fiber parameter testing, and particularly relates to an optical fiber geometric dimension testing device and a testing method. Background Art

[0002] With the popularization of the Internet and the continuous improvement of the transmission capacity of trunk optical cable networks, fiber optic access networks have become one of the key areas of global optical communication development today.

[0003] Among them, testing optical fiber parameters is of extremely important significance, which is mainly reflected in the following aspects:

[0004] 1) Ensure the quality of optical fiber communication: Optical fiber parameter testing can comprehensively evaluate the performance of optical fibers, including geometric characteristics (such as core diameter, cladding diameter, concentricity error, etc.), optical characteristics (such as mode field diameter, cut-off wavelength, refractive index distribution, etc.), and transmission characteristics (such as attenuation, dispersion, etc.). Through these tests, it can be ensured that optical fibers can transmit optical signals stably and efficiently in actual communication systems;

[0005] 2) Ensure the stability and reliability of the communication system: Optical fiber communication systems are the backbone of modern communication networks, and their stability and reliability are directly related to the performance of the entire communication network. By testing optical fiber parameters, potential problems (such as optical fiber breakage, excessive joint loss, optical fiber aging, etc.) can be detected in a timely manner, so as to take measures to repair or optimize in advance and avoid communication interruption;

[0006] 3) Meet technical standards and quality control requirements: Optical fiber parameter testing is an indispensable part of the optical fiber production, construction, and acceptance processes. Through strict testing, it can be ensured that optical fiber products meet relevant standards, thereby guaranteeing the quality of communication projects;

[0007] 4) Optimize the design and maintenance of optical fiber communication systems: In the design stage of optical fiber communication systems, parameter testing can help engineers select appropriate optical fiber types and specifications to meet the requirements of specific application scenarios. In the maintenance stage, regular parameter testing can monitor the performance changes of optical fibers, detect and solve potential problems in a timely manner, and extend the service life of optical fibers;

[0008] 5) Reduce construction and operation costs: During the construction of optical cables, through optical fiber parameter testing (such as OTDR testing), quality problems of optical cables can be detected in advance, avoiding construction rework and increased subsequent maintenance costs caused by optical cable quality problems.

[0009] With the wide application of multimode optical fibers and special optical fibers, the requirements for the geometric dimensions of optical fibers are gradually increasing. At present, before testing the geometric dimensions of an optical fiber, it is usually necessary to first fix the optical fiber through a fixture to ensure that the test end of the optical fiber is close to the fixture and is straight with the clamped part of the optical fiber. Subsequently, the corresponding test equipment is used to test the transmission performance of the optical fiber. After the transmission performance test is completed, the optical fiber needs to be removed from the fixture and cut off to obtain an optical fiber specimen with a specified length suitable for geometric dimension testing. Then, the obtained optical fiber specimen is fixed through a fixture for geometric dimension testing. Therefore, the current operation process for testing the geometric dimensions of optical fibers is relatively cumbersome, and the preparation work before testing takes a long time, resulting in a relatively long overall testing time. Summary of the Invention

[0010] In view of the defects of the above-mentioned prior art, the present invention provides an optical fiber geometric dimension testing device and a testing method. After testing the transmission performance of the optical fiber, it is not necessary to remove the optical fiber from the fixture and then cut it off. Therefore, the stability of the testing can be increased, and the operation process of testing the geometric dimensions of the optical fiber is simple, the preparation work before testing takes a short time, and the overall testing time is short.

[0011] The technical solution adopted by the present invention to solve its technical problems is:

[0012] An optical fiber geometric dimension testing device includes a fixture, a cutting tool, a light source, an objective lens, a camera, and a controller; the fixture is used for clamping the optical fiber and being close to the test end of the optical fiber, so that the test end of the optical fiber and the clamped part are straight; the cutting tool is located above one side of the fixture and away from the test end of the optical fiber, and is driven by a first driving member to descend to approach and cut the optical fiber to obtain an optical fiber specimen with a specified length and being straight, wherein the test ends of the optical fiber and the optical fiber specimen are the same, and the cutting end of the optical fiber forms the illumination end of the optical fiber specimen; the light source is located on one side of the cutting tool and away from the fixture, and is driven by a second driving member to move to approach the illumination end of the optical fiber specimen; the objective lens is located on the other side of the fixture and close to the test end of the optical fiber specimen, and is used for testing the end face of the test end of the optical fiber specimen and imaging; the camera is located on one side of the objective lens and away from the fixture and is connected to the controller, and is used for photographing the imaging image of the objective lens and sending it to the controller.

[0013] Further, the first driving member is a cylinder, the cylinder body of the cylinder is fixed at a position above one side of the fixture, and the cutting tool is fixed at the lower end of the piston rod of the cylinder.

[0014] Further, the first driving member is a first linear motor, and the cutting tool is driven by the first linear motor to descend and cut the optical fiber or ascend and reset.

[0015] Further, the second driving member includes a rotary motor, a lead screw, and a nut. The axis of the lead screw is parallel to the axis of the optical fiber sample. The lead screw is driven by the rotary motor to rotate. The nut is screwed onto the lead screw and moves along the axial direction of the lead screw as the lead screw rotates. The light source is fixed on the nut and is directly opposite to the illumination end of the optical fiber sample.

[0016] Further, the second driving member is a second linear motor. The light source is driven by the second linear motor to move horizontally to the right to approach and be directly opposite to the test end of the optical fiber sample or move horizontally to the left and away from the test end of the optical fiber sample.

[0017] Further, the fixture is fixed on the fixture base.

[0018] Further, the light source is an LED light source.

[0019] Further,

[0020] The optical fiber sample includes an optical fiber core, an optical fiber cladding, a primary coating layer, and a secondary coating layer. The optical fiber cladding covers the optical fiber core. The primary coating layer covers the optical fiber cladding. The secondary coating layer covers the primary coating layer. And the refractive indices of the optical fiber cladding, the primary coating layer, and the secondary coating layer are different;

[0021] Or the optical fiber sample includes an optical fiber core, an optical fiber outer layer, and a plurality of optical fiber internal supports. The optical fiber outer layer covers the optical fiber core and the plurality of optical fiber internal supports;

[0022] Or the optical fiber sample includes an optical fiber outer layer and a plurality of optical fiber cores. The optical fiber outer layer covers the plurality of optical fiber cores.

[0023] An optical fiber geometric dimension testing method uses the above-mentioned optical fiber geometric dimension testing device for testing, and includes the following steps;

[0024] S1. First, clamp the optical fiber at the test end of the optical fiber through the fixture to make the test end and the clamped part of the optical fiber straight. Then, perform a transmission performance test on the optical fiber. After the transmission performance test is completed, drive the cutting tool to descend through the first driving member to make the cutting tool approach and cut the optical fiber to obtain an optical fiber sample with a specified length and straightness. Then, drive the cutting tool to rise and reset through the first driving member;

[0025] S2. Drive the light source to move through the second driving member to make the light source approach the illumination end of the optical fiber sample, and the light source injects light into the illumination end of the optical fiber sample. The objective lens tests the end face of the test end of the optical fiber sample and forms an image. The camera captures the image formed by the objective lens and sends it to the controller. The controller calculates and obtains the geometric dimensions of the optical fiber sample according to the received image.

[0026] Further, the following steps are further included:

[0027] S3. Drive the light source to move in the reverse direction through the second driving member, so that the light source is away from the illumination end of the optical fiber specimen, then remove the optical fiber specimen from the fixture, and then repeat steps S1-S2 for another optical fiber to be tested.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] The optical fiber geometric dimension testing device in the present invention includes a fixture, a cutting tool, a light source, an objective lens, a camera and a controller; the fixture is used to clamp the optical fiber and be close to the test end of the optical fiber, so that the test end and the clamping part of the optical fiber are kept straight; the cutting tool is above one side of the fixture and away from the test end of the optical fiber, and is driven by a first driving member to descend to approach and cut the optical fiber to obtain an optical fiber specimen with a specified length and kept straight, wherein the test ends of the optical fiber and the optical fiber specimen are consistent, and the cutting end of the optical fiber forms the illumination end of the optical fiber specimen; the light source is on one side of the cutting tool and away from the fixture, and is driven by a second driving member to move to approach the illumination end of the optical fiber specimen; the objective lens is on the other side of the fixture and close to the test end of the optical fiber specimen, and is used to test the end face of the test end of the optical fiber specimen and image; the camera is on one side of the objective lens and away from the fixture and is connected to the controller, and is used to capture the imaging image of the objective lens and send it to the controller; when testing the geometric dimension of the optical fiber, first clamp the optical fiber at the test end of the optical fiber through the fixture, so that the test end and the clamping part of the optical fiber are kept straight, then test the transmission performance of the optical fiber, after the transmission performance test is completed, drive the cutting tool to descend through the first driving member, so that the cutting tool approaches and cuts the optical fiber to obtain an optical fiber specimen with a specified length and kept straight, then drive the cutting tool to rise and reset through the first driving member, and then drive the light source to move through the second driving member, so that the light source approaches the illumination end of the optical fiber specimen, and the light source injects light into the illumination end of the optical fiber specimen, the objective lens tests the end face of the test end of the optical fiber specimen and images, the camera captures the imaging image of the objective lens and sends it to the controller, and the controller calculates and obtains the geometric dimension of the optical fiber specimen according to the received image. In this way, after testing the transmission performance of the optical fiber, there is no need to remove the optical fiber from the fixture and then truncate it, but drive the cutting tool to descend through the first driving member, so that the cutting tool approaches and directly cuts the optical fiber to obtain an optical fiber specimen with a specified length and kept straight, and then drive the light source to move through the second driving member, so that the light source approaches the illumination end of the optical fiber specimen, and through the cooperation of the objective lens, the camera and the controller, the geometric dimension of the optical fiber specimen is tested, so the stability of the test can be increased, and the operation process of testing the geometric dimension of the optical fiber is simple, the preparation work before the test takes less time, and the overall test time is shorter. In addition, since the test ends of the optical fiber and the optical fiber specimen are consistent, the present invention can realize testing the transmission performance of the optical fiber and the geometric dimension of the optical fiber at the same test end face. Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of the fiber optic geometric dimension testing device in the present invention;

[0031] Figure 2 It is an image of the end face of the test end of the first fiber optic specimen in the specific embodiment of the present invention;

[0032] Figure 3 It is an image of the end face of the test end of the second fiber optic specimen in the specific embodiment of the present invention;

[0033] Figure 4 It is an image of the end face of the test end of the third fiber optic specimen in the specific embodiment of the present invention.

[0034] Explanation of the reference numerals in the drawings: 1. Fixture, 2. Cutting tool, 3. Light source, 4. Objective lens, 5. Camera, 6. Fixture base, 7. Fiber optic specimen, 701. Fiber core, 702. Fiber cladding, 703. Primary coating, 704. Secondary coating, 705. Fiber outer layer, 706. Internal support of the fiber. Specific Embodiments

[0035] The following further elaborates on the specific embodiments of the present invention with reference to the drawings. These embodiments are only for illustrating the present invention and are not intended to limit the present invention.

[0036] In the description of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for facilitating the description of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, in the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more than two.

[0039] An optical fiber geometric dimension testing device includes a fixture 1, a cutting tool 2, a light source 3, an objective lens 4, a camera 5 and a controller; the fixture 1 is used for clamping an optical fiber and approaching the testing end of the optical fiber to keep the testing end and the clamping part of the optical fiber straight; the cutting tool 2 is located above one side of the fixture 1 and away from the testing end of the optical fiber, and is driven by a first driving member to descend to approach and cut the optical fiber to obtain an optical fiber specimen 7 with a specified length and kept straight, wherein the testing ends of the optical fiber and the optical fiber specimen 7 are consistent, and the cutting end of the optical fiber forms the light-irradiating end of the optical fiber specimen 7; the light source 3 is located on one side of the cutting tool 2 and away from the fixture 1, and is driven by a second driving member to move to approach the light-irradiating end of the optical fiber specimen 7; the objective lens 4 is located on the other side of the fixture 1 and close to the testing end of the optical fiber specimen 7, and is used for testing the end face of the testing end of the optical fiber specimen 7 and imaging; the camera 5 is located on one side of the objective lens 4 and away from the fixture 1 and is connected to the signal input end of the controller, and is used for photographing the imaging image of the objective lens 4 and sending it to the controller.

[0040] When testing the geometric dimension of the optical fiber, first clamp the optical fiber at the testing end of the optical fiber by the fixture 1 to keep the testing end and the clamping part of the optical fiber straight, then test the transmission performance of the optical fiber. After the transmission performance test is completed, drive the cutting tool 2 to descend by the first driving member to make the cutting tool 2 approach and cut the optical fiber to obtain an optical fiber specimen 7 with a specified length and kept straight. Then drive the cutting tool 2 to rise and reset by the first driving member. After that, drive the light source 3 to move by the second driving member to make the light source 3 approach the light-irradiating end of the optical fiber specimen 7, and the light source 3 injects light into the light-irradiating end of the optical fiber specimen 7. The light of the light source 3 is conducted straightly through the inside of the optical fiber specimen 7 to the end face of the testing end of the optical fiber specimen 7. The image of the end face of the testing end of the optical fiber specimen 7 is magnified by the objective lens 4 and mapped onto the camera 5. The camera 5 photographs the imaging image of the objective lens 4 and sends it to the controller. The controller processes and analyzes the received image, and calculates and obtains the geometric dimension of the optical fiber specimen 7 in combination with the pixel ratio of the camera 5 and the ratio of the pixel to the actual physical dimension.

[0041] After testing the transmission performance of the optical fiber, instead of removing the optical fiber from the fixture 1 and then truncating it, the cutting tool 2 is driven to descend by the first driving member, so that the cutting tool 2 approaches and directly cuts the optical fiber to obtain an optical fiber specimen 7 with a specified length and kept straight. Then, the light source 3 is driven to move by the second driving member, so that the light source 3 approaches the illuminated end of the optical fiber specimen 7, and through the cooperation of the objective lens 4, the camera 5 and the controller, the geometric dimensions of the optical fiber specimen 7 are tested. Therefore, the stability of the test can be increased, and the operation process of testing the geometric dimensions of the optical fiber is simple, the preparation work before the test takes less time, and the overall test time is shorter. In addition, since the test ends of the optical fiber and the optical fiber specimen 7 are consistent, the present invention can realize testing the transmission performance of the optical fiber and the geometric dimensions of the optical fiber at the same test end face.

[0042] Moreover, the present invention processes and analyzes the images captured by the camera 5 through the controller to obtain the geometric dimensions of the optical fiber specimen 7. Therefore, the test is more convenient and fast, and the errors existing in the manual measurement of the geometric dimensions of the optical fiber can be avoided.

[0043] In one embodiment, the first driving member is a cylinder, the cylinder block of the cylinder is fixed at an upper position on one side of the fixture 1, and the cutting tool 2 is fixed at the lower end of the piston rod of the cylinder.

[0044] In one embodiment, the first driving member is a first linear motor, and the cutting tool 2 is driven by the first linear motor to descend and cut the optical fiber or ascend and reset.

[0045] In one embodiment, the second driving member includes a rotary motor, a lead screw and a nut. The axis of the lead screw is parallel to the axis of the optical fiber specimen 7. The lead screw is driven by the rotary motor to rotate, and the nut is screwed on the lead screw and moves along the axial direction of the lead screw as the lead screw rotates. The light source 3 is fixed on the nut and the light source 3 faces the illuminated end of the optical fiber specimen 7.

[0046] In one embodiment, the second driving member is a second linear motor, and the light source 3 is driven by the second linear motor to move horizontally to the right to approach and face the test end of the optical fiber specimen 7 or move horizontally to the left and away from the test end of the optical fiber specimen 7.

[0047] In one embodiment, the fixture 1 is fixed on the fixture base 6.

[0048] In one embodiment, the light source 3 is an LED light source 3.

[0049] An optical fiber geometric dimension testing method uses the above-mentioned optical fiber geometric dimension testing device for testing, and includes the following steps;

[0050] S1. First, clamp the optical fiber at the test end of the optical fiber by the fixture 1 to keep the test end and the clamped part of the optical fiber straight. Then, perform a transmission performance test on the optical fiber. After the transmission performance test is completed, drive the cutting tool 2 to descend by the first driving member, so that the cutting tool 2 approaches and cuts the optical fiber to obtain an optical fiber specimen 7 with a specified length and kept straight. Then, drive the cutting tool 2 to rise and reset by the first driving member;

[0051] S2. Drive the light source 3 to move by the second driving member, so that the light source 3 approaches the illuminated end of the optical fiber specimen 7, and the light source 3 injects light into the illuminated end of the optical fiber specimen 7. The light of the light source 3 is conducted straight through the inside of the optical fiber specimen 7 to the end face of the test end of the optical fiber specimen 7. The objective lens 4 tests the end face of the test end of the optical fiber specimen 7 and forms an image. The camera 5 captures the image formed by the objective lens 4 and sends it to the controller. The controller processes and analyzes the received image, and combines the pixel ratio of the camera 5 and the ratio of the pixel to the actual physical size to calculate and obtain the geometric size of the optical fiber specimen 7;

[0052] S3. Drive the light source 3 to move in the reverse direction by the second driving member, so that the light source 3 moves away from the illuminated end of the optical fiber specimen 7. Then, remove the optical fiber specimen 7 from the fixture 1, and then repeat steps S1 - S2 for another optical fiber to be tested.

[0053] The optical fiber geometric size testing device and the optical fiber geometric size testing method of the present invention are applicable to various types of optical fibers. Specifically:

[0054] The first type of optical fiber specimen 7 includes an optical fiber core 701, an optical fiber cladding 702, a primary coating layer 703, and a secondary coating layer 704. The optical fiber cladding 702 covers the optical fiber core 701, the primary coating layer 703 covers the optical fiber cladding 702, and the secondary coating layer 704 covers the primary coating layer 703, and the refractive indices of the optical fiber cladding 702, the primary coating layer 703, and the secondary coating layer 704 are different; thus, when the light source 3 injects parallel light into the illuminated end of the optical fiber specimen 7, rings with inconsistent brightness and darkness can be clearly shown in the image captured by the camera 5, and the controller can distinguish and calculate the geometric sizes of each layer according to different bright and dark regions.

[0055] The second type of optical fiber specimen 7 includes an optical fiber core 701, an optical fiber outer layer 705, and multiple optical fiber internal supports 706. The optical fiber outer layer 705 covers the optical fiber core 701 and multiple optical fiber internal supports 706; thus, when the light source 3 injects parallel light into the illuminated end of the optical fiber specimen 7, the structural contours of the optical fiber core 701 and each optical fiber internal support 706 within the optical fiber outer layer 705 can be clearly shown in the image captured by the camera 5, and the controller can accurately distinguish and calculate the geometric sizes of the internal structure and the overall structure of the optical fiber specimen 7.

[0056] The third optical fiber specimen 7 includes an optical fiber outer layer 705 and multiple optical fiber cores 701. The optical fiber outer layer 705 covers the multiple optical fiber cores 701. In this way, when the light source 3 injects parallel light rays into the light-illuminating end of the optical fiber specimen 7, the structural contours of each optical fiber core 701 within the optical fiber outer layer 705 can be clearly shown in the image captured by the camera 5, and the controller can accurately distinguish and calculate the geometric dimensions of the internal structure and the overall structure of the optical fiber specimen 7.

[0057] In summary, after testing the transmission performance of the optical fiber, instead of removing the optical fiber from the fixture 1 and then cutting it, the present invention drives the cutting tool 2 to descend through the first driving member, so that the cutting tool 2 approaches and directly cuts the optical fiber to obtain an optical fiber specimen 7 with a specified length and kept straight. Then, the light source 3 is driven to move through the second driving member, so that the light source 3 approaches the light-illuminating end of the optical fiber specimen 7, and through the cooperation of the objective lens 4, the camera 5 and the controller, the geometric dimensions of the optical fiber specimen 7 are tested. Therefore, the stability of the test can be increased, and the operation process of testing the geometric dimensions of the optical fiber is simple. The preparation work before the test takes less time, and the overall test time is short. In addition, since the test ends of the optical fiber and the optical fiber specimen 7 are the same, the present invention can realize testing both the transmission performance of the optical fiber and the geometric dimensions of the optical fiber at the same test-end end face.

[0058] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. An optical fiber geometric dimension testing device, characterized in that: It includes a fixture (1), a cutting tool (2), a light source (3), an objective lens (4), a camera (5) and a controller; the fixture (1) is used for clamping an optical fiber and approaching the test end of the optical fiber; the cutting tool (2) is located above one side of the fixture (1) and away from the test end, and is driven by a first driving member to descend to cut the optical fiber, obtaining a flat optical fiber specimen (7), wherein the test ends of the optical fiber and the optical fiber specimen (7) are kept consistent, and the cut end of the optical fiber forms the illumination end of the optical fiber specimen (7); the light source (3) is located on one side of the cutting tool (2) and away from the fixture (1), and is driven by a second driving member to move closer to the illumination end. The objective lens (4) is located on the other side of the fixture (1) and close to the test end, and is used for testing and imaging the end face of the test end of the optical fiber specimen (7); the camera (5) is located on one side of the objective lens (4) and away from the fixture (1) and is connected to the controller, and is used for photographing the imaging image of the objective lens (4) and sending it to the controller.

2. The optical fiber geometric size testing device according to claim 1, wherein: The first driving member is a cylinder, the cylinder block of the cylinder is fixed at a position above one side of the fixture (1), and the cutting tool (2) is fixed at the lower end of the piston rod of the cylinder.

3. The optical fiber geometric dimension testing device according to claim 1, wherein: The first driving member is a first linear motor, and the cutting tool (2) is driven by the first linear motor to descend to cut the optical fiber or ascend to reset.

4. The optical fiber geometric size testing device according to claim 1, characterized in that: The second driving member includes a rotary motor, a lead screw and a nut, the axis of the lead screw is parallel to the axis of the optical fiber specimen (7), the lead screw is driven by the rotary motor to rotate, the nut is screwed on the lead screw and moves along the axial direction of the lead screw as the lead screw rotates, and the light source (3) is fixed on the nut and the light source (3) is directly opposite to the illumination end of the optical fiber specimen (7).

5. The optical fiber geometric size testing device according to claim 1, characterized in that: The second driving member is a second linear motor, and the light source (3) is driven by the second linear motor to move horizontally to the right to approach and be directly opposite to the test end of the optical fiber specimen (7) or move horizontally to the left and away from the test end of the optical fiber specimen (7).

6. The optical fiber geometric dimension measuring device according to claim 1, wherein: The fixture (1) is fixed on a fixture base (6).

7. The optical fiber geometric size testing device according to claim 1, characterized in that: The light source (3) is an LED light source (3).

8. A fiber optic geometric dimension testing device according to claim 1, wherein: The optical fiber specimen (7) includes an optical fiber core (701), an optical fiber cladding (702), a primary coating layer (703) and a secondary coating layer (704), the optical fiber cladding (702) covers the optical fiber core (701), the primary coating layer (703) covers the optical fiber cladding (702), the secondary coating layer (704) covers the primary coating layer (703), and the refractive indexes of the optical fiber cladding (702), the primary coating layer (703) and the secondary coating layer (704) are different; Or the optical fiber specimen (7) includes an optical fiber core (701), an optical fiber outer layer (705) and a plurality of optical fiber internal supports (706), and the optical fiber outer layer (705) covers the optical fiber core (701) and the plurality of optical fiber internal supports (706); Or the optical fiber specimen (7) includes an optical fiber outer layer (705) and a plurality of optical fiber cores (701), and the optical fiber outer layer (705) covers the plurality of optical fiber cores (701).

9. A method for testing the geometric dimensions of an optical fiber, which is tested by using the optical fiber geometric dimension testing device according to any one of claims 1-8, characterized in that, It includes the following steps; S1. First, clamp the optical fiber at the test end of the optical fiber by the fixture (1) to keep the test end and the clamped part of the optical fiber straight. Then, perform a transmission performance test on the optical fiber. After the transmission performance test is completed, drive the cutting tool (2) to descend by the first driving member, so that the cutting tool (2) approaches and cuts the optical fiber to obtain an optical fiber specimen (7) with a specified length and kept straight. Then, drive the cutting tool (2) to rise and reset by the first driving member; S2. Drive the light source (3) to move by the second driving member, so that the light source (3) approaches the illuminated end of the optical fiber specimen (7), and the light source (3) injects light into the illuminated end of the optical fiber specimen (7). The objective lens (4) tests the end face of the test end of the optical fiber specimen (7) and forms an image. The camera (5) takes an image of the image formed by the objective lens (4) and sends it to the controller. The controller calculates and obtains the geometric dimensions of the optical fiber specimen (7) according to the received image.

10. A method for testing the geometric dimensions of an optical fiber according to claim 9, characterized in that, It further includes the following steps: S3. Drive the light source (3) to move in the reverse direction by the second driving member, so that the light source (3) moves away from the illuminated end of the optical fiber specimen (7). Then, remove the optical fiber specimen (7) from the fixture (1). After that, repeat steps S1 - S2 for another optical fiber to be tested.

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