Ultraviolet multimode optical fiber testing system

Abstract

The utility model belongs to the field of multimode optical fiber testing, and particularly discloses an ultraviolet multimode optical fiber testing system. An ultraviolet laser, an ultraviolet filter and a light path switcher are sequentially arranged along a light path; a first switching optical path of the optical path switcher is connected to the input end of the first ultraviolet optical fiber collimator, and a second switching optical path of the optical path switcher is connected to the input end of the second ultraviolet optical fiber collimator; the output end of the first ultraviolet optical fiber collimator, the ultraviolet multimode optical fiber to be detected and the broadband detection device are connected in sequence; the output end of the second ultraviolet optical fiber collimator, the ultraviolet multimode optical fiber to be detected and the attenuation detection device are connected in sequence; the broadband detection device is used for detecting the bandwidth of the ultraviolet multimode optical fiber to be detected, and the attenuation detection device is used for detecting the attenuation of the ultraviolet multimode optical fiber. The ultraviolet multi-mode optical fiber testing system can effectively evaluate the bandwidth performance or attenuation performance of the ultraviolet multi-mode optical fiber, and solves the problem that the existing multi-mode optical fiber testing system is not suitable for the performance test of the ultraviolet multi-mode optical fiber.

Description

Technical Field

[0001] This application belongs to the field of multimode fiber testing, and more specifically, relates to an ultraviolet multimode fiber testing system. Background Technology

[0002] Ultraviolet (UV) multimode fiber is a type of optical fiber specifically designed for transmitting ultraviolet light (typically with wavelengths between 200-400 nanometers). It is a fiber made of glass or plastic, characterized by high hydroxyl content and low attenuation, making it suitable as a medium for UV light transmission. It is primarily used for UV signal transmission and has a large transmission capacity; its transmission principle is total internal reflection. Currently, it is commonly used for UV laser transmission and UV signal transmission.

[0003] Current multimode fiber testing systems can only test bandwidth at 850nm and 1300nm and attenuation in the infrared band. Therefore, existing multimode fiber testing systems cannot effectively evaluate the attenuation and bandwidth of ultraviolet multimode fibers. Utility Model Content

[0004] In view of the above-mentioned defects or improvement needs of the existing technology, this application provides an ultraviolet multimode fiber testing system, which aims to solve the technical problem that there is currently no suitable testing system for ultraviolet multimode fiber.

[0005] To achieve the above objectives, in a first aspect, this application provides an ultraviolet multimode fiber testing system, comprising an ultraviolet laser, an ultraviolet fiber collimator, an ultraviolet multimode fiber under test, and an ultraviolet fiber detection device arranged sequentially along the optical path. The ultraviolet fiber detection device is used to calculate the bandwidth or attenuation of the ultraviolet multimode fiber under test based on the input ultraviolet light signal.

[0006] Preferably, the ultraviolet fiber optic detection device includes an ultraviolet phototube, a digital oscilloscope, and a host computer; the output end of the ultraviolet multimode fiber under test is connected to the input end of the ultraviolet phototube, the output end of the ultraviolet phototube is connected to the input end of the digital oscilloscope, the output end of the digital oscilloscope is connected to the input end of the host computer, and the host computer calculates the bandwidth of the ultraviolet multimode fiber under test based on the input half-width at half-maximum (WHM).

[0007] Preferably, the ultraviolet fiber detection device includes an ultraviolet power meter and a host computer; the output end of the ultraviolet multimode fiber under test is connected to the input end of the ultraviolet power meter, the output end of the ultraviolet power meter is connected to the input end of the host computer, and the host computer calculates the attenuation of the ultraviolet multimode fiber under test based on the input optical power.

[0008] Preferably, it further includes an adjustable attenuator located between the ultraviolet filter and the optical path of the ultraviolet fiber collimator; and / or, it further includes an ultraviolet filter located between the ultraviolet laser and the optical path of the ultraviolet fiber collimator.

[0009] Preferably, the center wavelength of the ultraviolet laser is adjustable within the ultraviolet band, the pulse width is within 10 picoseconds, and the output power is adjustable; the filtering range of the ultraviolet filter matches the center wavelength of the ultraviolet laser; the adjustable attenuator is adjustable via light intensity; the operating range of the ultraviolet fiber collimator includes the ultraviolet band; the response time of the ultraviolet phototube is in the picosecond range, its operating range includes the ultraviolet band, and its peak wavelength matches the center wavelength of the ultraviolet laser; the operating range of the ultraviolet power meter includes the ultraviolet band.

[0010] Secondly, this application provides an ultraviolet multimode fiber testing system, including an ultraviolet laser and an optical path switch arranged sequentially along the optical path; it also includes a first ultraviolet fiber collimator, a second ultraviolet fiber collimator, a first ultraviolet multimode fiber under test, a second ultraviolet multimode fiber under test, an attenuation detection device, and a broadband detection device; the first switching optical path of the optical path switch is connected to the input end of the first ultraviolet fiber collimator, and the second switching optical path is connected to the input end of the second ultraviolet fiber collimator; the output end of the first ultraviolet fiber collimator, the first ultraviolet multimode fiber under test, and the broadband detection device are connected sequentially; the output end of the second ultraviolet fiber collimator, the second ultraviolet multimode fiber under test, and the attenuation detection device are connected sequentially; the broadband detection device is used to detect the bandwidth of the first ultraviolet multimode fiber under test, and the attenuation detection device is used to detect the attenuation of the second ultraviolet multimode fiber under test.

[0011] Preferably, the broadband detection device includes an ultraviolet phototube, a digital oscilloscope, and a host computer; the output end of the first ultraviolet multimode fiber under test is connected to the input end of the ultraviolet phototube, the output end of the ultraviolet phototube is connected to the input end of the digital oscilloscope, the output end of the digital oscilloscope is connected to the input end of the host computer, and the host computer calculates the bandwidth of the first ultraviolet multimode fiber under test based on the input half-width at half-maximum (WHM).

[0012] Preferably, the attenuation detection device includes an ultraviolet power meter and a host computer; the output end of the second ultraviolet multimode fiber under test is connected to the input end of the ultraviolet power meter, the output end of the ultraviolet power meter is connected to the input end of the host computer, and the host computer calculates the attenuation of the second ultraviolet multimode fiber under test based on the input optical power.

[0013] Preferably, the host computer is also electrically connected to the ultraviolet laser for controlling the power of the ultraviolet laser; and / or, the host computer is also electrically connected to the optical path switcher for controlling the optical path switcher to switch between the first switching optical path and the second switching optical path.

[0014] Preferably, the optical path switcher includes a linear motor, a lifting platform, and a total reflection mirror; the total reflection mirror is fixed on the lifting platform, and the lifting platform is connected to the moving parts of the linear motor, rising or falling under the drive of the linear motor; after the lifting platform falls, the incident light is directly output from the first switching optical path to the input end of the first ultraviolet fiber collimator; after the lifting platform rises, the incident light changes its optical path through the raised total reflection mirror and is output from the second switching optical path to the input end of the second ultraviolet fiber collimator.

[0015] Preferably, it further includes a first adjustable attenuator and a second adjustable attenuator, wherein the first adjustable attenuator is located between the optical path switcher and the optical path of the first ultraviolet fiber collimator; the second adjustable attenuator is located between the optical path switcher and the optical path of the second ultraviolet fiber collimator; and / or, it further includes an ultraviolet filter, wherein the ultraviolet filter is located between the ultraviolet laser and the optical path of the ultraviolet fiber collimator.

[0016] Preferably, the center wavelength of the ultraviolet laser is adjustable within the ultraviolet band, the pulse width is within 10 picoseconds, and the output power is adjustable; the filtering range of the ultraviolet filter matches the center wavelength of the ultraviolet laser; the first and second adjustable attenuators are adjustable by light intensity; the operating range of the first and second ultraviolet fiber collimators includes the ultraviolet band; the response time of the ultraviolet phototube is in the picosecond range, its operating range includes the ultraviolet band, and its peak wavelength matches the center wavelength of the ultraviolet laser; the operating range of the ultraviolet power meter includes the ultraviolet band.

[0017] Overall, the technical solutions conceived in this application have the following beneficial effects compared with the prior art:

[0018] (1) The ultraviolet multimode fiber testing system proposed in this application can effectively evaluate the bandwidth performance or attenuation performance of ultraviolet multimode fiber, and solves the problem that the existing multimode fiber testing system is not suitable for ultraviolet multimode fiber performance testing.

[0019] (2) The ultraviolet multimode fiber test system proposed in this application integrates bandwidth performance test and attenuation performance test together through optical path switcher, thereby improving the test efficiency in actual production process.

[0020] (3) This application can achieve bandwidth and attenuation testing of any ultraviolet wavelength by adjusting the filtering band of the ultraviolet filter, thereby improving the system adaptability. Attached Figure Description

[0021] Figure 1 This is one of the schematic diagrams of an ultraviolet multimode fiber testing system provided in the embodiments of this application.

[0022] Figure 2 This is a waveform diagram of the output pulse signal of a 2-meter ultraviolet multimode fiber under test during the ultraviolet multimode fiber testing process provided in the embodiments of this application.

[0023] Figure 3 This is a waveform diagram of the output pulse signal of a 100-meter ultraviolet multimode fiber under test during the ultraviolet multimode fiber testing process provided in the embodiments of this application.

[0024] Figure 4 This is a second schematic diagram of an ultraviolet multimode fiber testing system provided in the embodiments of this application.

[0025] Figure 5 This is the third schematic diagram of an ultraviolet multimode fiber testing system provided in the embodiments of this application.

[0026] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0027] 1 is an ultraviolet laser; 2 is an ultraviolet filter; 3 is an optical path switcher; 4 is a first ultraviolet fiber collimator; 5 is a second ultraviolet fiber collimator; 6 is a first ultraviolet multimode fiber under test; 7 is a second ultraviolet multimode fiber under test; 8 is an ultraviolet phototube; 9 is a digital oscilloscope; 10 is an ultraviolet power meter; 11 is a host computer; 12 is a first adjustable attenuator; 13 is a second adjustable attenuator. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0029] In this article, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The symbol " / " in this article indicates that the related objects are in an "or" relationship; for example, A / B means A or B.

[0030] The terms "first" and "second," etc., used in the specification and claims herein are used to distinguish different objects, not to describe a specific order of the objects. For example, "first adjustable attenuator" and "second adjustable attenuator," etc., are used to distinguish different adjustable attenuators, not to describe a specific order of the adjustable attenuators.

[0031] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0032] In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. For example, multiple adjustable attenuators means two or more adjustable attenuators.

[0033] The embodiments of this application are described below with reference to the accompanying drawings.

[0034] Example 1:

[0035] like Figure 1 As shown, this application proposes an ultraviolet multimode fiber testing system, which includes an ultraviolet laser 1, an ultraviolet filter 2, an optical path switcher 3, a first ultraviolet fiber collimator 4, a second ultraviolet fiber collimator 5, an ultraviolet phototube 8, a digital oscilloscope 9, an ultraviolet power meter 10, a host computer 11, a first adjustable attenuator 12, and a second adjustable attenuator 13.

[0036] The ultraviolet light stably output from the ultraviolet laser 1 is filtered out by the ultraviolet filter 2 to remove stray light. The ultraviolet light signal passing through the ultraviolet filter 2 is switched by the optical path switcher 3. When bandwidth testing is required, the optical path switcher 3 switches to the first switched optical path, and the ultraviolet light signal is output to the first adjustable attenuator 12 through the first switched optical path. When attenuation testing is required, the optical path switcher 3 switches to the second switched optical path, and the ultraviolet light signal is output to the second adjustable attenuator 13 through the second switched optical path.

[0037] The optical path switcher 3 includes a linear motor, a lifting platform, and a total reflection mirror. The linear motor is connected to the host computer 11 via a signal line and controlled by the host computer software. After receiving the control signal from the host computer software, the linear motor's actuator moves along the track to a preset position. The lifting platform is connected to the linear motor's actuator, and the lifting platform rises or falls to a preset height under the drive of the actuator. A 45-degree total reflection mirror is fixed on the lifting platform. After the lifting platform falls, the incident light from the optical path switcher 3 is directly output to the first adjustable attenuator 12. After the lifting platform rises, the total reflection mirror on the lifting platform rises into the optical path of the incident light, and the incident light is projected along the optical path to the total reflection mirror, which reflects the incident light to the second adjustable attenuator 13.

[0038] The optical signal passing through the first adjustable attenuator 12 enters the first ultraviolet fiber collimator 4 for collimation. After collimation, the optical signal enters the first ultraviolet multimode fiber 6 under test. The optical signal output from the first ultraviolet multimode fiber 6 under test enters the ultraviolet phototube 8. The ultraviolet phototube 8 converts the input optical signal into an electrical signal and outputs it to the digital oscilloscope 9 for half-width at half-maximum (WHM) resolution. The resolution result is transmitted to the host computer 11 via the GPIB signal line. The host computer 11 calculates the bandwidth of the first ultraviolet multimode fiber 6 under test based on the resolution result.

[0039] The optical signal passing through the second adjustable attenuator 13 enters the second ultraviolet fiber collimator 5 for collimation. After collimation, the optical signal enters the second ultraviolet multimode fiber 7 under test. The optical signal output from the second ultraviolet multimode fiber 7 enters the ultraviolet power meter 10 for optical power analysis. The analysis result is transmitted to the host computer 11 via the RS232 signal line. The host computer 11 calculates the attenuation of the second ultraviolet multimode fiber 7 under test based on the analysis result.

[0040] In the system, the parameters of ultraviolet laser 1 are: center wavelength 355nm, pulse width 8ps, and adjustable output power from 0-10W. The laser is cooled by a chiller to ensure stable light source output. Ultraviolet laser 1 is connected to a host computer via an RS232 serial port, and the host computer controls the output power of the laser.

[0041] In the system, the ultraviolet laser 1 is fixed on the optical platform, and the ultraviolet filter 2 is a ZBW2 ultraviolet filter. The ultraviolet filter 2 is collimated and placed in the optical path by an optical support.

[0042] In the system, the intensity of the transmitted light signal can be changed by manually adjusting the adjustable attenuator, or the intensity of the output light signal can be controlled by directly adjusting the ultraviolet laser 1.

[0043] In the system, the output ends of the first ultraviolet fiber collimator 4 and the second ultraviolet fiber collimator 5 are ultraviolet multimode fiber patch cords with FC / PC flanges, with an operating range of 350nm-700nm, and are equipped with achromatic lenses with a focal length of 4mm and a waist of 0.65mm.

[0044] In the system, the optical signal input end of the ultraviolet phototube 8 is an FC / PC flange. The two ends of the first ultraviolet multimode fiber 6 under test are connected to bare fiber adapters, and the first ultraviolet fiber collimator 4 and the ultraviolet phototube 8 are connected through the bare fiber adapters at both ends.

[0045] In the system, the ultraviolet phototube 8 has a response time of 60ps, a wavelength of 185-650nm, a peak wavelength of 340nm, and a power supply voltage of 2000V. The ultraviolet phototube 8 is powered by a 2000V, 50mA DC power supply through a high-voltage box. The ultraviolet phototube 8 converts the detected ultraviolet pulse light signal into an electrical signal, which is then analyzed by the digital oscilloscope 9 to obtain the full width at half maximum (FWHM) of the signal.

[0046] In the system, the optical signal input terminal of the ultraviolet power meter 10 is an FC / PC flange. Bare fiber adapters are connected to both ends of the second ultraviolet multimode fiber 7 to be tested. These bare fiber adapters are then connected to the second ultraviolet fiber collimator 5 and the ultraviolet power meter 10, respectively. The ultraviolet power meter 10 detects the optical power of the input optical signal, with a wavelength range of 190-2000nm and a measurement range of 5mW-150W.

[0047] The bandwidth test of ultraviolet multimode optical fiber is now performed using the system disclosed in Embodiment 1, specifically including the following steps:

[0048] Step 1: Remove 2cm of coating from both ends of the first UV multimode fiber 6 to be tested, and clamp them onto the bare fiber adapter. Use a fiber optic cleaver to cut two smooth and flat sections at the coating removal points. Connect one section to the FC / PC flange at the output port of the first UV fiber collimator 4, and connect the other section to the FC / PC flange at the input port of the UV phototube 8.

[0049] Step 2: Fill in the sample information, sample number, sample length, and control the optical path switcher of the host computer software to switch to the "bandwidth test" option.

[0050] Step 3: Record the full width at half maximum (FWHM) of the pulse based on the pulse waveform displayed on the digital oscilloscope 9. .

[0051] Step 4: Adjust the first adjustable attenuator 12; cut the first UV multimode fiber 6 2m from the input end and create a smooth, flat cross-section. Connect the cross-section to the FC / PC flange at the input end of the UV phototube 8 via a bare fiber adapter, thus retaining 2m of the first UV multimode fiber 6 for testing. Record the full width at half maximum (FWHM) of the pulse based on the results from the digital oscilloscope 9. .

[0052] like Figure 2 , Figure 3 The image shows the waveform of the ultraviolet multimode fiber output pulse signal detected by the digital oscilloscope 9.

[0053] Step 5: The host computer software will... and Automatically calculate the fiber optic bandwidth of the sample under test The calculation results are then stored in the results test file.

[0054]

[0055] The attenuation test of ultraviolet multimode optical fiber is now performed using the system disclosed in Embodiment 1, specifically including the following steps:

[0056] Step 1: Remove 2cm of coating from both ends of the second UV multimode fiber 7 to be tested, and clamp them onto the bare fiber adapter. Use a fiber optic cleaver to cut two smooth and flat sections at the coating removal points. Connect one section to the FC / PC flange at the output port of the second UV fiber collimator 5, and connect the other section to the FC / PC flange at the input port of the UV power meter 10.

[0057] Step 2: Fill in the sample information, sample number, sample length, and control the optical path switcher of the host computer software to switch to the "attenuation test" option.

[0058] Step 3: Record the power reading displayed by the UV power meter 10 as follows. .

[0059] Step 4: Adjust the second adjustable attenuator 13; cut the second UV multimode fiber 7 2m from the input end and create a smooth, flat cross-section. Connect the cross-section to the FC / PC flange at the input end of the UV power meter 10 via a bare fiber adapter, thus leaving 2m of the second UV multimode fiber 7 for testing. Record the power reading displayed by the UV power meter 10. .

[0060] Step 5: The software in host computer 11 will... and Automatically calculate the fiber optic attenuation of the tested sample :

[0061]

[0062] in, The length of the second UV multimode fiber 7 to be tested after being cut off.

[0063] Example 2:

[0064] like Figure 4 The image shows a UV multimode fiber testing system proposed in this application, comprising a UV laser 1, a UV filter 2, a first adjustable attenuator 4, a first UV fiber collimator 4, a first UV multimode fiber under test 6, and a UV fiber detection device arranged sequentially along the optical path. The UV fiber detection device is used to calculate the bandwidth of the UV multimode fiber under test based on the input UV light signal. The UV fiber detection device includes:

[0065] The system consists of an ultraviolet phototube 8, a digital oscilloscope 9, and a host computer 11. The output of the first ultraviolet multimode fiber 6 under test is connected to the input of the ultraviolet phototube 8. The output of the ultraviolet phototube 8 is connected to the input of the digital oscilloscope 9. The output of the digital oscilloscope 9 is connected to the input of the host computer 11. The host computer 11 calculates the bandwidth of the first ultraviolet multimode fiber 6 under test based on the input half-width at half-maximum (WHM).

[0066] Example 3:

[0067] like Figure 5The image shows a UV multimode fiber testing system proposed in this application, comprising a UV laser 1, a UV filter 2, a second adjustable attenuator 13, a second UV fiber collimator 5, a second UV multimode fiber under test 7, and a UV fiber detection device arranged sequentially along the optical path. The UV fiber detection device is used to calculate the attenuation of the UV multimode fiber under test based on the input UV light signal. The UV fiber detection device includes:

[0068] The system includes an ultraviolet power meter 10 and a host computer 11. The output end of the second ultraviolet multimode fiber 7 to be tested is connected to the input end of the ultraviolet power meter 10, and the output end of the ultraviolet power meter 10 is connected to the input end of the host computer 11. The host computer 11 calculates the attenuation of the second ultraviolet multimode fiber 7 to be tested based on the input optical power.

[0069] The ultraviolet multimode fiber testing system proposed in this application can effectively evaluate the bandwidth performance or attenuation performance of ultraviolet multimode fiber, and solves the problem that existing multimode fiber testing systems are not suitable for ultraviolet multimode fiber performance testing.

[0070] It should be understood that expressions such as “comprising” and “may include” used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as “comprising” and / or “having” are to be interpreted as indicating a particular characteristic, number, operation, constituent element, component, or combination thereof, but not to exclude the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0071] Furthermore, in this application, the expression "and / or" includes any and all combinations of the associated listed words. For example, the expression "A and / or B" may include A, may include B, or may include both A and B.

[0072] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixed connection" refers to a connection where the relative positional relationship remains unchanged after connection. "Rotary connection" refers to a connection where the components can rotate relative to each other after connection. "Sliding connection" refers to a connection where the components can slide relative to each other after connection. The directional terms mentioned in the embodiments of this application, such as "top," "bottom," "inner," "outer," "left," and "right," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0073] Furthermore, the mathematical concepts mentioned in the embodiments of this application, such as symmetry, equality, parallelism, and perpendicularity, are limitations specific to the current technological level, rather than absolute and strict mathematical definitions. Slight deviations are permissible; approximations of symmetry, equality, parallelism, and perpendicularity are all acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 and 10 degrees. "A and B are perpendicular" means that A and B are perpendicular or approximately perpendicular, and the angle between A and B can be between 80 and 100 degrees.

[0074] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A UV multimode fiber testing system, characterized in that, The device includes an ultraviolet laser, an ultraviolet fiber collimator, an ultraviolet multimode fiber under test, and an ultraviolet fiber detection device arranged sequentially along the optical path. The ultraviolet fiber detection device is used to calculate the bandwidth or attenuation of the ultraviolet multimode fiber under test based on the input ultraviolet light signal.

2. The ultraviolet multimode fiber testing system according to claim 1, characterized in that, The ultraviolet fiber optic detection device includes an ultraviolet phototube, a digital oscilloscope, and a host computer. The output end of the ultraviolet multimode fiber under test is connected to the input end of the ultraviolet phototube, the output end of the ultraviolet phototube is connected to the input end of the digital oscilloscope, and the output end of the digital oscilloscope is connected to the input end of the host computer. The host computer calculates the bandwidth of the ultraviolet multimode fiber under test based on the input half-width at half-maximum (WHM).

3. The ultraviolet multimode fiber testing system according to claim 1, characterized in that, The ultraviolet fiber optic detection device includes an ultraviolet power meter and a host computer; the output end of the ultraviolet multimode fiber under test is connected to the input end of the ultraviolet power meter, and the output end of the ultraviolet power meter is connected to the input end of the host computer. The host computer calculates the attenuation of the ultraviolet multimode fiber under test based on the input optical power.

4. The ultraviolet multimode fiber testing system according to claim 1, characterized in that, It also includes an adjustable attenuator located between the optical paths of the ultraviolet filter and the ultraviolet fiber collimator; and / or, it also includes an ultraviolet filter located between the optical paths of the ultraviolet laser and the ultraviolet fiber collimator.

5. A UV multimode fiber testing system, characterized in that, The device includes an ultraviolet laser and an optical path switch arranged sequentially along the optical path; it also includes a first ultraviolet fiber collimator, a second ultraviolet fiber collimator, a first ultraviolet multimode fiber under test, a second ultraviolet multimode fiber under test, an attenuation detection device, and a broadband detection device; the first switching optical path of the optical path switch is connected to the input end of the first ultraviolet fiber collimator, and the second switching optical path is connected to the input end of the second ultraviolet fiber collimator; the output end of the first ultraviolet fiber collimator, the first ultraviolet multimode fiber under test, and the broadband detection device are connected sequentially. The output end of the second ultraviolet fiber collimator, the second ultraviolet multimode fiber under test, and the attenuation detection device are connected in sequence. The broadband testing device is used to detect the bandwidth of the first ultraviolet multimode fiber under test, and the attenuation testing device is used to detect the attenuation of the second ultraviolet multimode fiber under test.

6. The ultraviolet multimode fiber testing system according to claim 5, characterized in that, The broadband testing device includes an ultraviolet phototube, a digital oscilloscope, and a host computer. The output end of the first ultraviolet multimode fiber under test is connected to the input end of the ultraviolet phototube, the output end of the ultraviolet phototube is connected to the input end of the digital oscilloscope, and the output end of the digital oscilloscope is connected to the input end of the host computer. The host computer calculates the bandwidth of the first ultraviolet multimode fiber under test based on the input half-width at half-maximum (WHM).

7. The ultraviolet multimode fiber testing system according to claim 5, characterized in that, The attenuation detection device includes an ultraviolet power meter and a host computer; the output end of the second ultraviolet multimode fiber under test is connected to the input end of the ultraviolet power meter, and the output end of the ultraviolet power meter is connected to the input end of the host computer. The host computer calculates the attenuation of the second ultraviolet multimode fiber under test based on the input optical power.

8. The ultraviolet multimode fiber testing system according to claim 6 or 7, characterized in that, The host computer is also electrically connected to the ultraviolet laser for controlling the power of the ultraviolet laser; and / or, the host computer is also electrically connected to the optical path switcher for controlling the optical path switcher to switch between the first switching optical path and the second switching optical path.

9. The ultraviolet multimode fiber testing system according to claim 5, characterized in that, The optical path switcher includes a linear motor, a lifting platform, and a total reflection mirror. The total reflection mirror is fixed on the lifting platform, and the lifting platform is connected to the moving parts of the linear motor, rising or falling under the drive of the linear motor. After the lifting platform falls, the incident light is directly output from the first switching optical path to the input end of the first ultraviolet fiber collimator. After the lifting platform rises, the incident light changes its optical path through the raised total reflection mirror and is output from the second switching optical path to the input end of the second ultraviolet fiber collimator.

10. The ultraviolet multimode fiber testing system according to claim 5, characterized in that, It also includes a first adjustable attenuator and a second adjustable attenuator, the first adjustable attenuator being located between the optical path switcher and the optical path of the first ultraviolet fiber collimator; the second adjustable attenuator being located between the optical path switcher and the optical path of the second ultraviolet fiber collimator; and / or, it also includes an ultraviolet filter, the ultraviolet filter being located between the ultraviolet laser and the optical path of the ultraviolet fiber collimator.

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