A device and method for measuring the effective core diameter of an optical fiber

Abstract

The present invention belongs to the field of optical fiber testing technology, and discloses a device and method for measuring the effective diameter of the core of an optical fiber. The present invention adjusts the end face of the output end of the optical fiber to be tested to be aligned with the axis of the swing arm, adjusts a certain core to be tested at the input end of the optical fiber to be tested to be aligned with the axis of the light injection optical path, couples the light emitted by the light source to the core to be tested and emits it to the swing arm; a plurality of probes of different types are installed on the swing arm, and a probe on the swing arm is selected and switched as the measuring probe according to the type of the optical fiber to be tested; the measuring probe, the photoelectric conversion module, the signal processing module, and the host computer are sequentially connected to form a measuring unit; according to the type of the optical fiber to be tested and the measurement mode, the measuring unit performs a measurement operation to obtain measurement information and calculates the effective diameter of the core. The present invention can realize the test of mode field diameter and numerical aperture by using one device, and can be applicable to optical fibers of multiple sizes and types, with powerful functions and a wide range of applications.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical fiber testing, and more specifically, relates to a device and method for measuring the effective core diameter of an optical fiber. Background Art

[0002] Mode Field Diameter (MFD) is an important performance indicator of single-mode optical fiber. It is used to characterize the distribution of fundamental mode light in the core area of ​​single-mode optical fiber. The fundamental mode has the highest light intensity at the axis of the core area and gradually weakens as the distance from the axis increases. The numerical aperture (NA) of the optical fiber is an important parameter of multimode optical fiber. It indicates the ability of the optical fiber end face to receive light. Accurately measuring the mode field diameter or numerical aperture of the optical fiber can help to deeply understand the characteristics of the optical fiber, provide accurate parameters for the production of optical fiber, and improve the production quality of optical fiber.

[0003] Existing fiber optic testing systems have the following deficiencies: (1) Existing fiber optic testing systems can usually only test the mode field diameter or the numerical aperture, and cannot perform multi-function testing. (2) Existing fiber optic testing systems can usually only test conventional-sized optical fibers (for example, the diameter of a conventional single-mode fiber core is 9 um), and cannot test optical fibers of special sizes. (3) Multi-core optical fibers also require mode field diameter testing, but existing fiber optic testing systems can only test single-mode single-core optical fibers, and cannot test the mode field diameter of single-mode multi-core optical fibers. Summary of the invention

[0004] In order to at least partially solve the deficiencies of the above-mentioned prior art, the present invention provides a device and method for measuring the effective core diameter of an optical fiber. By switching the measurement mode, the mode field diameter and the numerical aperture can be tested. By selecting and switching the probe, optical fibers of multiple sizes and types can be tested. In addition, using the above-mentioned device, the present invention also proposes a method for measuring the mode field diameter of a single-mode multi-core optical fiber, which can fill the technical gap in the technical field that cannot measure the mode field diameter of a single-mode multi-core optical fiber.

[0005] The present invention provides a method for measuring the effective diameter of the core of an optical fiber, comprising: placing the input end and the output end of the optical fiber to be measured on a displacement table respectively; adjusting the position of the output end of the optical fiber to be measured so that the end face of the output end of the optical fiber to be measured is aligned with the axis of a swing arm; adjusting the position of the input end of the optical fiber to be measured so that a certain core to be measured at the input end of the optical fiber to be measured is aligned with the axis of a light injection optical path; coupling light emitted by a light source to the core to be measured via the light injection optical path, and irradiating the light to the swing arm after being output via the output end of the optical fiber to be measured; a plurality of probes of different types are installed on the swing arm, and a probe on the swing arm is selected and switched as a measuring probe according to the type of the optical fiber to be measured; the measuring probe, the photoelectric conversion module, the signal processing module, and the host computer are connected in sequence to form a measuring unit; according to the type of the optical fiber to be measured and the measuring mode, the measuring unit performs a measuring operation to obtain measurement information, and calculates the effective diameter of the core based on the measurement information; the measuring mode includes a mode field diameter measurement mode and a numerical aperture measurement mode.

[0006] Preferably, a first lighting device is provided on the side of the output end of the optical fiber under test, and the light emitted by the first lighting device is vertically irradiated on the side of the output end of the optical fiber under test; an image of the side of the output end of the optical fiber under test is acquired by a first camera, and the acquired first image information is transmitted to the host computer; the host computer adjusts a first three-axis translation table carrying the output end of the optical fiber under test according to the first image information until the central axis of the output end of the optical fiber under test coincides with the horizontal center line of the first camera, and the projection of the end face of the output end of the optical fiber under test coincides with the vertical center line of the first camera, so that the end face of the output end of the optical fiber under test is aligned with the axis of the swing arm.

[0007] Preferably, a second lighting device, a collimating device and a light source are respectively arranged along an axis in the area corresponding to the input end of the measured optical fiber, and the light source, the optical switch and the host computer are connected in sequence; the light source and the collimating device constitute the light injection optical path; the light emitted by the second lighting device is irradiated on the end face of the input end of the measured optical fiber, and the image of the end face of the input end of the measured optical fiber is captured by a second camera, and the captured second image information is transmitted to the host computer; the host computer adjusts the second three-axis translation stage carrying the input end of the measured optical fiber according to the second image information, so that a certain measured fiber core at the input end of the measured optical fiber is aligned with the axis of the light injection optical path; the light source is controlled to be turned on by the optical switch, and the light emitted by the light source is coupled into the measured fiber core after passing through the collimating device.

[0008] Preferably, the second camera and the first camera are the same camera, which is mounted on a rotating motor, and the rotating motor is connected to the host computer. The host computer controls the rotation of the rotating motor to adjust the shooting angle of the camera.

[0009] Preferably, different types of probes have different first lengths and / or different sensing area sizes, and the first length is the distance from the center of the sensing area of ​​the probe to the axis of the swing arm.

[0010] Preferably, when the type of the measured optical fiber is a multi-core optical fiber, each core in the multi-core optical fiber is measured in turn to obtain measurement information of the multi-core optical fiber; wherein, after completing the measurement of a core in the multi-core optical fiber, the end face of the output end of the multi-core optical fiber is kept aligned with the axis of the swing arm, the position of the input end of the multi-core optical fiber is adjusted to align another core with the axis of the light injection path, and the light emitted by the light source is coupled to the core, and the measurement unit performs a measurement operation on the core; the above operation is repeated until all the cores in the multi-core optical fiber are measured.

[0011] Preferably, when the measurement mode is the mode field diameter measurement mode, the host computer controls the swing arm to rotate around the axis of the swing arm, obtains power values ​​at multiple angles through the measurement unit, and calculates the mode field diameter according to the far-field scanning method.

[0012] Preferably, when the measurement mode is the numerical aperture measurement mode, the host computer controls the swing arm to rotate around the axis of the swing arm, obtains power values ​​at multiple angles through the measurement unit, and calculates the numerical aperture according to the far-field numerical aperture calculation method.

[0013] Preferably, when the measuring unit performs a measuring operation, the host computer first adjusts the position of the measuring probe based on the displayed power value so that the measuring probe is at the maximum power value point, and then controls the swing arm to rotate around the axis of the swing arm based on the maximum power value point to obtain power values ​​at multiple angles within the required measurement range.

[0014] On the other hand, the present invention provides a device for measuring the effective core diameter of an optical fiber, comprising: a swing arm, a photoelectric conversion module, a signal processing module, a host computer, a first lighting device, a second lighting device, a collimation device, a light source, an optical switch, a first camera, a second camera, and a translation stage respectively used to carry the input end and the output end of the measured optical fiber; the device for measuring the effective core diameter of an optical fiber is used to implement the steps in the above-mentioned method for measuring the effective core diameter of an optical fiber.

[0015] One or more technical solutions provided in the present invention have at least the following technical effects or advantages:

[0016] (1) The present invention can realize the test of mode field diameter and numerical aperture by switching the measurement mode, and can realize the test of optical fibers of multiple sizes and types by selecting and switching the probe. That is, the device provided by the present invention can be used to test the mode field diameter and numerical aperture of optical fibers of different sizes and types, and has powerful functions and a wide range of applications.

[0017] (2) The device provided by the present invention can be used to measure the mode field diameter of a single-mode multi-core optical fiber, filling the technical gap in the technical field that cannot measure the mode field diameter of a multi-core optical fiber.

[0018] (3) Compared with the existing testing devices and methods, the device provided by the present invention has a simple structure and a high degree of automation. The method is simple and convenient to operate, the control is more precise, and it has high stability, and can accurately measure the mode field diameter or numerical aperture of the optical fiber. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a structural block diagram of a device for measuring the effective core diameter of an optical fiber provided by an embodiment of the present invention;

[0020] Figure 2 It is the structural diagram of the T-type swing arm;

[0021] Figure 3 It is the structural diagram of the Z-type swing arm;

[0022] Figure 4 This is the structural diagram of the V-type swing arm;

[0023] Figure 5 It is a flow chart of measuring the mode field diameter of a multi-core optical fiber using a device for measuring the effective core diameter of an optical fiber provided by an embodiment of the present invention;

[0024] Figure 6 It is the image when the end face of the output end of the optical fiber under test is aligned with the axis of the swing arm;

[0025] Figure 7 This is an image of the illuminated input end of a single-mode multicore fiber. DETAILED DESCRIPTION

[0026] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] The present invention provides a device for measuring the effective core diameter of an optical fiber, see Figure 1, including: a host computer 1, an optical switch 2, a light source 3, a collimating device (for example, it may specifically include a first collimating lens 4 and a second collimating lens 5), a second lighting device 6, a second three-axis translation stage 7, a first camera, a second camera (in a preferred solution, the first camera and the second camera are the same camera, denoted as camera 8, and the camera 8 can be installed on a rotating motor, and the rotating motor and the camera 8 are both connected to the host computer 1, and the host computer 1 controls the rotation of the rotating motor to adjust the shooting angle of the camera 8, and the host computer 1 controls the camera 8 to collect images, and the camera 8 transmits the collected image information to the host computer 1), a first three-axis translation stage 10, a first lighting device 11, a swing arm 12, a photoelectric conversion module 13, and a signal processing module 14.

[0028] The second three-axis translation stage 7 is used to carry the input end of the optical fiber 9 under test, and the first three-axis translation stage 10 is used to carry the output end of the optical fiber 9 under test. Both translation stages are connected to the host computer 1, and the host computer 1 controls the two translation stages to adjust their positions.

[0029] The swing arm 12 is arranged in the area corresponding to the output end of the optical fiber 9 to be measured, and a plurality of different types of probes are installed on the swing arm 12. The swing arm 12 is connected to the host computer 1, and the host computer 1 selects and switches a probe on the swing arm 12 as a measuring probe according to the type of the optical fiber 9 to be measured; the measuring probe, the photoelectric conversion module 13, the signal processing module 14, and the host computer 1 are connected in sequence to form a measuring unit. In addition, the photoelectric conversion module 13 can also be directly connected to the host computer 1, and the host computer performs signal processing.

[0030] The first lighting device 11 is arranged in the side area of ​​the output end of the optical fiber 9 under test, and the light emitted by the first lighting device 11 is vertically irradiated on the side of the output end of the optical fiber 9 under test; the side of the output end of the optical fiber 9 under test is imaged by the first camera, and the first image information acquired is transmitted to the host computer 1; the host computer 1 adjusts the first three-axis translation stage 10 according to the first image information until the central axis of the output end of the optical fiber 9 under test coincides with the horizontal center line of the first camera, and the projection of the end face of the output end of the optical fiber 9 under test coincides with the vertical center line of the first camera, so that the end face of the output end of the optical fiber 9 under test is aligned with the axis of the swing arm 12. The first lighting device 11 can specifically be an LED lamp.

[0031] The second lighting device 6, the collimating device and the light source 3 are arranged in sequence along an axis in the area corresponding to the input end of the optical fiber 9 under test, and the light source 3, the optical switch 2 and the host computer 1 are connected in sequence; the light source 3 and the collimating device constitute a light injection optical path. The collimating device is located between the light source 3 and the second lighting device 6, and is connected to the host computer 1. The host computer 1 adjusts the collimating device to achieve collimation. The second lighting device 6 can specifically be a ring light.

[0032] The light emitted by the second lighting device 6 is irradiated on the end face of the input end of the measured optical fiber 9, and the image of the end face of the input end of the measured optical fiber 9 is collected by the second camera, and the collected second image information is transmitted to the host computer 1; the host computer 1 adjusts the second three-axis displacement stage 7 according to the second image information, so that a certain measured fiber core at the input end of the measured optical fiber 9 is aligned with the axis of the injection light path; the light source 3 is controlled to be turned on by the optical switch 2, and the light emitted by the light source 3 is coupled into the measured fiber core after passing through the collimating device. That is, the input end of the measured optical fiber passes through the three-axis displacement stage, and under the control of the host computer 1, the measured light wave can be adaptively injected into the measured fiber core by spatial coupling.

[0033] For example, when the optical fiber 9 under test is a single-core optical fiber, the host computer 1 adjusts the second three-axis translation stage 7 according to the second image information to align the core of the input end of the single-core optical fiber with the axis of the light injection optical path.

[0034] For example, when the optical fiber 9 to be measured is a multi-core optical fiber, the host computer 1 needs to adjust the second three-axis translation stage 7 according to the second image information, so that the multiple cores at the input end of the multi-core optical fiber are aligned with the axis of the light injection optical path in turn. That is, after each measured core is aligned, a measurement is performed; when performing the next measurement, the second three-axis translation stage 7 is first adjusted to move based on the image of the input end of the multi-core optical fiber to achieve alignment of the next measured core, and then light is coupled into the core, and finally the measurement is performed. Repeat the above operation, measure each core in the multi-core optical fiber one by one, save the measurement results, and end the measurement.

[0035] By using the above-mentioned device for measuring the effective core diameter of an optical fiber provided by the present invention, the test of the mode field diameter and the numerical aperture can be realized by switching the measurement mode, and the test of optical fibers of multiple sizes and types can be realized by selecting and switching the probe. By controlling the test process, the mode field diameter of a single-mode multi-core optical fiber can also be measured. A method for measuring the effective core diameter of an optical fiber provided by the present invention is described below.

[0036] The main steps of the test include: placing the input end and the output end of the optical fiber under test on the displacement table respectively; adjusting the position of the output end of the optical fiber under test so that the end face of the output end of the optical fiber under test is aligned with the axis of the swing arm; adjusting the position of the input end of the optical fiber under test so that a certain optical core under test at the input end of the optical fiber under test is aligned with the axis of the light injection optical path; coupling the light emitted by the light source to the optical core under test through the light injection optical path, and irradiating the light to the swing arm after being output through the output end of the optical fiber under test; selecting and switching a certain probe on the swing arm as a measurement probe according to the type of the optical fiber under test, and according to the type of the optical fiber under test and the measurement mode, the measurement unit performs a measurement operation to obtain measurement information, and calculates the effective diameter of the core based on the measurement information.

[0037] Wherein, the swing arm can be used as follows according to the measurement requirements: Figure 2 The T-shaped swing arm shown in Figure 3 The Z-type swing arm shown, such as Figure 4 The V-shaped swing arm shown in the figure is provided with a plurality of different types of probes installed on the swing arm, and the different types of probes have different first lengths and / or different sensing area sizes, and the first length is the distance from the sensing area center of the probe to the axis center of the swing arm. For example, Figure 2 The T-shaped swing arm shown is equipped with a first probe A and a second probe B, which have different first lengths L and sensing area sizes (i.e., sensing area diameters D). By selecting and switching the above probes, it is possible to test optical fibers of different sizes and types, and the application range is wide. It can not only test conventional-sized optical fibers, but also test optical fibers of unconventional sizes, and can not only test single-core optical fibers, but also test multi-core optical fibers.

[0038] The optical fiber to be measured in the present invention can be a single-mode single-core optical fiber, a single-mode multi-core optical fiber, a multi-mode optical fiber, a special optical fiber, a conventional size optical fiber, an unconventional size optical fiber, etc. The measurement mode includes a mode field diameter measurement mode and a numerical aperture measurement mode. The present invention is illustrated below in combination with specific optical fiber types and measurement modes.

[0039] For example, when the fiber under test is a single-mode multi-core fiber and the measurement mode is the mode field diameter measurement mode, refer to the test procedure. Figure 5 , it is necessary to measure each fiber core in the multi-core optical fiber in turn to obtain the measurement information of the multi-core optical fiber. The specific test process includes:

[0040] S1: placing the input end and the output end of the multi-core optical fiber on the second three-axis translation stage and the first three-axis translation stage respectively;

[0041] S2: Control the light emitted by the first lighting device to irradiate vertically on the side of the output end of the multi-core optical fiber, and collect images of the side of the output end of the multi-core optical fiber through the camera and transmit them to the host computer; the host computer adjusts the first three-axis translation stage according to the first image information until the central axis of the output end of the multi-core optical fiber coincides with the horizontal center line of the camera, and the projection of the end face of the output end of the multi-core optical fiber coincides with the vertical center line of a camera, so that the end face of the output end of the multi-core optical fiber is aligned with the axis of the swing arm, and can also correspond to the sensing area of ​​the probe, such as Figure 6 As shown;

[0042] S3: Control the light emitted by the second lighting device to illuminate the end face of the input end of the multi-core optical fiber, and use the camera to capture an image of the end face of the input end of the multi-core optical fiber and transmit it to the host computer. The image of the illuminated input end of the multi-core optical fiber is as follows: Figure 7 As shown; the host computer adjusts the second three-axis translation stage according to the second image information, so that a certain measured fiber core at the input end of the multi-core optical fiber is aligned with the axis of the light injection optical path; the light source is turned on by controlling the optical switch, and the light emitted by the light source is coupled to the measured fiber core after passing through the collimating device; the measuring unit performs a measuring operation to obtain measurement information, and calculates the measured fiber core mode field diameter based on the measurement information;

[0043] S4: After completing the measurement of a core in the multi-core optical fiber, return to S3, adjust the position of the input end of the multi-core optical fiber to align another core with the axis of the light injection path, couple the light emitted by the light source to the core, and the measurement unit performs the measurement operation on the core to calculate the mode field diameter of the core; repeat the above operation until all the cores in the multi-core optical fiber are measured and the test is ended.

[0044] Among them, the present invention performs mode field diameter measurement operation based on the far-field scanning method, that is, the host computer controls the swing arm to rotate around the axis of the swing arm, obtains power values ​​at multiple angles through the measurement unit, and calculates the mode field diameter according to the far-field scanning method.

[0045] When the optical fiber under test is a multimode optical fiber and the measurement mode is the numerical aperture measurement mode, similar to the test process of the mode field diameter described above, it is only necessary to select and switch the swing arm of the appropriate structure as needed, and select to execute the numerical aperture test process on the host computer. The host computer controls the swing arm to rotate around the axis of the swing arm, and obtains the power values ​​at multiple angles through the measurement unit, and then the host computer calculates the numerical aperture according to the far-field numerical aperture calculation method.

[0046] When the measuring unit performs a measurement operation (including a mode field diameter measurement operation and a numerical aperture measurement operation), the host computer can first adjust the position of the measuring probe based on the displayed power value so that the measuring probe is at the point of maximum power value, and then control the swing arm to rotate around the axis of the swing arm based on the point of maximum power value to obtain power values ​​at multiple angles within the required measurement range.

[0047] Specifically, the mode field diameter is defined as the time when the light intensity is reduced to 1 / e of the maximum light intensity at the axis. 2 The maximum distance between two points in the far-field numerical aperture is defined as the sine value of the half-angle where the light intensity drops to 5% of the maximum value on the far-field radiation diagram of the optical fiber. Based on the above definition, the power values ​​at multiple angles within the required measurement range are obtained, and then the effective core diameter of the measured optical fiber (i.e., mode field diameter, numerical aperture) is calculated.

[0048] It should be noted that the measurement of the mode field diameter of a single-mode multi-core optical fiber is not limited to the present invention. Figure 7 The 8-core optical fiber shown is also applicable to optical fibers with single-mode optical fiber cores of 1, 2, 3, ... N (N is a positive integer). In addition, it is not limited to multi-core optical fibers arranged in a ring, but is also applicable to multi-core optical fibers arranged in other ways, such as honeycomb.

[0049] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A method for measuring the effective core diameter of an optical fiber, characterized in that: include: Place the input end and output end of the optical fiber to be tested on the translation stage respectively; The position of the output end of the optical fiber under test is adjusted so that the end face of the output end of the optical fiber under test is aligned with the axis of the swing arm; the position of the input end of the optical fiber under test is adjusted so that a certain core under test at the input end of the optical fiber under test is aligned with the axis of the light injection optical path; the light emitted by the light source is coupled to the core under test through the light injection optical path, and the light is output through the output end of the optical fiber under test and then irradiated to the swing arm; a plurality of probes of different types are installed on the swing arm, and a certain probe on the swing arm is selected and switched as a measuring probe according to the type of the optical fiber under test; the measuring probe, the photoelectric conversion module, the signal processing module, and the host computer are connected in sequence to form a measuring unit; according to the type of the optical fiber under test and the measurement mode, the measuring unit performs a measurement operation to obtain measurement information, and calculates the effective diameter of the core based on the measurement information; the measurement mode includes a mode field diameter measurement mode and a numerical aperture measurement mode.

2. The method for measuring the effective core diameter of an optical fiber according to claim 1, characterized in that: A first lighting device is arranged on the side of the output end of the optical fiber under test, and the light emitted by the first lighting device is vertically irradiated on the side of the output end of the optical fiber under test; an image of the side of the output end of the optical fiber under test is collected by a first camera, and the collected first image information is transmitted to the host computer; the host computer adjusts a first three-axis translation stage carrying the output end of the optical fiber under test according to the first image information until the central axis of the output end of the optical fiber under test coincides with the horizontal center line of the first camera, and the projection of the end face of the output end of the optical fiber under test coincides with the vertical center line of the first camera, so that the end face of the output end of the optical fiber under test is aligned with the axis of the swing arm.

3. The method for measuring the effective core diameter of an optical fiber according to claim 2, characterized in that: A second lighting device, a collimating device and a light source are respectively arranged along an axis in the area corresponding to the input end of the measured optical fiber, and the light source, the optical switch and the host computer are connected in sequence; the light source and the collimating device constitute the light injection optical path; the light emitted by the second lighting device is irradiated on the end face of the input end of the measured optical fiber, and the image of the end face of the input end of the measured optical fiber is collected by a second camera, and the collected second image information is transmitted to the host computer; the host computer adjusts the second three-axis translation stage carrying the input end of the measured optical fiber according to the second image information, so that a certain measured fiber core at the input end of the measured optical fiber is aligned with the axis of the light injection optical path; the light source is controlled to be turned on by the optical switch, and the light emitted by the light source is coupled into the measured fiber core after passing through the collimating device.

4. The method for measuring the effective core diameter of an optical fiber according to claim 3, characterized in that: The second camera and the first camera are the same camera, which is mounted on a rotating motor. The rotating motor is connected to the host computer, and the host computer controls the rotation of the rotating motor to adjust the shooting angle of the camera.

5. The method for measuring the effective core diameter of an optical fiber according to claim 1, characterized in that: Different types of probes have different first lengths and / or different sensing area sizes, where the first length is the distance from the center of the sensing area of ​​the probe to the axis of the swing arm.

6. The method for measuring the effective core diameter of an optical fiber according to claim 1, characterized in that: When the type of the measured optical fiber is a multi-core optical fiber, each core in the multi-core optical fiber is measured in turn to obtain measurement information of the multi-core optical fiber; After completing the measurement of a certain core in the multi-core optical fiber, the end face of the output end of the multi-core optical fiber is kept aligned with the axis of the swing arm, the position of the input end of the multi-core optical fiber is adjusted to align another core with the axis of the light injection path, and the light emitted by the light source is coupled to the core, and the measurement unit performs the measurement operation on the core; the above operation is repeated until all the cores in the multi-core optical fiber are measured.

7. The method for measuring the effective core diameter of an optical fiber according to claim 1, characterized in that: When the measurement mode is the mode field diameter measurement mode, the host computer controls the swing arm to rotate around the axis of the swing arm, obtains power values ​​at multiple angles through the measurement unit, and calculates the mode field diameter according to the far-field scanning method.

8. The method for measuring the effective core diameter of an optical fiber according to claim 1, characterized in that: When the measurement mode is the numerical aperture measurement mode, the host computer controls the swing arm to rotate around the axis of the swing arm, obtains power values ​​at multiple angles through the measurement unit, and calculates the numerical aperture according to the far-field numerical aperture calculation method.

9. The method for measuring the effective core diameter of an optical fiber according to claim 1, characterized in that: When the measuring unit performs a measuring operation, the host computer first adjusts the position of the measuring probe based on the displayed power value so that the measuring probe is at the maximum power value point, and then controls the swing arm to rotate around the axis of the swing arm based on the maximum power value point to obtain power values ​​at multiple angles within the required measurement range.

10. A device for measuring the effective core diameter of an optical fiber, characterized in that: include: A swing arm, a photoelectric conversion module, a signal processing module, a host computer, a first lighting device, a second lighting device, a collimating device, a light source, an optical switch, a first camera, a second camera, and a translation stage for carrying the input end and the output end of the optical fiber to be tested respectively; The device for measuring the effective core diameter of an optical fiber is used to implement the steps in the method for measuring the effective core diameter of an optical fiber according to any one of claims 1 to 9.

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