CN113567089A

CN113567089A - Double-cladding active optical fiber automatic testing device and method for optical fiber laser

Info

Publication number: CN113567089A
Application number: CN202111116195.2A
Authority: CN
Inventors: 李其军; 况慧君; 刘瑶娜; 黄友强; 龚勋; 刘晓旭; 闫大鹏
Original assignee: Wuhan Raycus Fiber Laser Technologies Co Ltd
Current assignee: Wuhan Raycus Fiber Laser Technologies Co Ltd
Priority date: 2021-09-23
Filing date: 2021-09-23
Publication date: 2021-10-29
Anticipated expiration: 2041-09-23
Also published as: CN113567089B

Abstract

The invention relates to the technical field of optical fiber performance testing equipment, and discloses a double-cladding active optical fiber automatic testing device and method for an optical fiber laser. The device comprises a cabinet, an optical module, a photon darkening module and an industrial personal computer. The invention has the following advantages and effects: the testing device and the testing method provided by the application have the advantages that the equipment is simple to operate, the operation can be finished by a single person, and the dependence on operators in the testing process is reduced; an audio analysis and acquisition module is arranged in the cabinet body, and can automatically alarm or power off when abnormal tests occur; the whole testing process is finished in the closed box body, so that potential safety hazards caused by manual operation are avoided; the appearance is simple, has carried out the collection dress to main test equipment, can change different test element modules according to different model products, is convenient for remove the change. The method and the device are simple and convenient to operate, the test can be independently completed by one person, and the influence of artificial uncertain factors on the test is also avoided. Meanwhile, multiple safety protection measures are provided, and the safety of personnel in the high-power test process is guaranteed.

Description

Double-cladding active optical fiber automatic testing device and method for optical fiber laser

Technical Field

The application relates to the technical field of optical fiber performance testing equipment, in particular to an active optical fiber testing device and an oblique efficiency, cladding light and photon darkening testing method.

Background

The fiber laser has the advantages of good beam quality, compact structure, small volume, light weight, easy heat dissipation, good working stability and the like, and has become a research hotspot of various countries in the world. The double-clad doped fiber adopted by the existing high-power fiber laser and fiber amplifier has higher and higher power along with the continuous popularization of the domestic fiber laser. From hundreds of watts to tens of thousands of watts. Has been widely applied to the fields of science and technology, military, medical treatment, industrial processing and the like. In the manufacturing industry, the light source is used as a high-intensity light source for cutting, punching, welding and the like. The power of the optical fiber lasers can not be improved by using the ytterbium-doped optical fiber as a double-clad active optical fiber of the resonant cavity.

These active fibers, in addition to requiring testing of some basic fiber parameters, include: mechanical properties of geometric dimension, numerical aperture, fiber core loss and cladding pumping absorption rate. The above-mentioned indicators were tested with specialized instrumentation at milliwatt power. In order to improve the product performance, some application function indexes need to be tested, including: the active optical fiber has 1080nm oblique efficiency under 2000W high power, optical fiber temperature, cladding light test, photon darkening test and the like. The existing performance testing device for the double-clad active optical fiber is simple and crude, has low safety factor and does not have ready-made equipment for testing the double-clad active optical fiber. Multiple persons are required to cooperate together. And (3) reading power index parameters of laser and red light visually, carrying out temperature test by using a handheld thermal infrared imager, and solving the problems of errors in data reading, manual filling of test reports, inaccurate record and the like. There is a need to solve these problems that plague the end of use.

Disclosure of Invention

Aiming at the defects in the prior art, the device and the method for automatically testing the double-clad active optical fiber for the optical fiber laser are provided, the test can be independently completed by one person, the artificial reading error is avoided, and the influence of artificial uncertain factors on the test is also avoided. Meanwhile, multiple safety protection measures are provided, and the safety of personnel in the high-power test process is guaranteed.

In order to achieve the above purposes, on one hand, the technical scheme is as follows:

the application provides an optical fiber laser is with active optic fibre automatic testing arrangement of double-clad, includes:

the equipment cabinet is provided with an upper part and a lower part, and the upper part is provided with an optical fiber disc wound with a double-clad active optical fiber to be detected;

the optical module comprises a high-reflection grating and a low-reflection grating which are connected with two ends of the double-cladding active optical fiber to be detected, and couplers are respectively arranged at the other ends of the high-reflection grating and the low-reflection grating; the optical module also comprises a mould stripper;

the photon darkening module comprises two groups of pump lasers and a matched pump power meter, wherein the two groups of pump lasers are used for respectively providing light sources for the high-reflection grating and the low-reflection grating; the device also comprises a red laser and a matched red power meter; the laser device also comprises a wavelength division multiplexer which is connected with different lasers and different pumping power meters, and a mode matcher which is connected with the wavelength division multiplexer and the double-clad active fiber to be tested;

and the industrial personal computer is used for controlling the optical module and the photon darkening module to test the double-cladding active optical fiber and calculating and outputting a test result.

Preferably, the method further comprises the following steps:

the thermal infrared imager is arranged at the upper part in the cabinet through the two-dimensional moving platform and scans in the cabinet according to a preset path through the two-dimensional moving platform;

the thermal infrared imager is also used for transmitting the detected temperature to the industrial personal computer.

Preferably, the method further comprises the following steps:

and the plurality of audio analysis and acquisition modules are distributed on the inner wall of the upper part in the cabinet and used for acquiring and analyzing the sound of fiber burning in the test process and sending an alarm to the industrial personal computer after acquisition.

Preferably, the method further comprises the following steps:

the cantilever computer is arranged outside the cabinet, is used for receiving and displaying a test result output by the industrial personal computer, and is also used for receiving external input information and sending the external input information to the industrial personal computer;

the camera is arranged at the upper part in the cabinet and used for transmitting the shot picture to the cantilever computer.

The application also provides an automatic testing method based on the double-cladding active optical fiber automatic testing device, which comprises the following steps:

coiling the double-clad active optical fiber to be detected on an optical fiber coil;

selecting an oblique efficiency test, a cladding light test or a photon darkening test of the active optical fiber through an industrial personal computer, and calculating and outputting a test result according to data of the pumping power meter;

the oblique efficiency test is obtained through two groups of pump lasers of the optical module and the photon darkening module and matched pump power meters, and the oblique efficiency does not adopt a mold stripper;

the cladding light test is obtained by adopting the optical module, the pumping power meter and a group of pumping lasers;

the photon darkening test is obtained by adopting a photon darkening module and a pumping power meter.

Preferably, the skew efficiency test comprises:

s11, respectively connecting the high-reflection grating and the low-reflection grating to a group of pump lasers through couplers;

s12, setting a group of gradually increased test currents, and respectively testing the sum of real-time power between the high-reflection grating and the corresponding coupler and between the low-reflection grating and the corresponding coupler under each current value;

s13, connecting two ends of the double-clad active optical fiber to be tested with a high-reflection grating and a low-reflection grating respectively, and connecting a coupler on one side of the low-reflection grating to a pumping power meter;

s14, sequentially supplying power to the pump laser by using each current value of the test current at a preset temperature, and respectively reading the value of a pump power meter;

and S15, calculating the skew efficiency of the double-clad active optical fiber to be tested according to the sum of the real-time power and the value calculated by the pumping power, and testing the skew efficiency to be qualified when the skew efficiency is larger than or equal to a preset threshold value.

Preferably, the automatic testing device comprises a thermal infrared imager which is arranged at the upper part of the cabinet through a two-dimensional moving platform and scans in the upper part of the cabinet according to a preset path through the two-dimensional moving platform;

the skew efficiency test further comprises the following steps:

and after the power is measured by the pump power meter at the last time, measuring the working temperature of the optical fiber by the thermal infrared imager, wherein the working temperature is qualified when the working temperature of the double-cladding active optical fiber to be measured is less than a preset threshold value.

Preferably, the cladding light test comprises:

s21, respectively connecting two ends of a double-clad active optical fiber to be detected to a high-reflection grating and a low-reflection grating, connecting the other end of the low-reflection grating to a pumping power meter, and connecting the other end of the high-reflection grating to a group of pumping lasers through a coupler;

s22, supplying light to a pump laser, and measuring a first laser power by a pump power meter;

s23, a mode stripper is connected between the low-reflection grating and the pump power meter, and the pump power meter measures second laser power under the same current condition;

s24, the difference between the first laser power and the second laser power is cladding light power, and when the cladding light power is larger than a power threshold value, the cladding light power is qualified.

Preferably, the head and tail sections of the optical fiber corresponding to one prefabricated rod are selected as the double-clad active optical fiber to be detected; the photon darkening test includes:

s31, connecting wavelength division multiplexers at two ends of the double-clad active fiber to be tested through mode matchers respectively, supplying light to the wavelength division multiplexer at one side through a red light laser and a pump laser, and connecting a pump power meter and a red light power meter at the outlet of the wavelength division multiplexer at the other side respectively;

s32, starting the red laser under the condition of voltage stabilization, and measuring the power of the blue optical fiber end of the wavelength division multiplexer by using a red power meter

Recording, and closing the red laser after recording;

s33, turning on a pump laser, detecting whether optical power output exists at the red optical fiber end of the wavelength division multiplexer through a pump power meter, and starting copying if the optical power output exists at the red optical fiber end of the wavelength division multiplexer;

s34, after the time is set, copying is finished, the pump laser is closed, the red laser is started under the condition of voltage stabilization, and the power is measured by the red power meter

；

S35, passing

And

calculating a descending percentage of optical fiber photodarkening effect (H), and passing a photodarkening test when H < a preset photodarkening effect threshold;

and when the two sections of the optical fibers at the head and the tail meet the requirements of the photon darkening test, the optical fiber corresponding to the prefabricated rod is qualified.

Preferably, the automatic test device comprises one or more audio analysis and acquisition modules arranged on the upper part of the cabinet;

the automatic test method further comprises the following steps:

the sound in the cabinet is collected through the audio analysis and collection module, and when the sound of fiber burning occurs, the audio analysis and collection module sends an alarm to the industrial personal computer;

and the industrial personal computer controls the optical module and/or the photon darkening module to stop working after receiving the alarm.

The beneficial effect that technical scheme that this application provided brought includes:

in this application, through industrial computer control optical module and photon darkening module for the artifical work of whole detection processes only needs to weld the optic fibre that awaits measuring according to instructing, and the test section can automatic realization, and is easy and simple to handle, need not operating personnel and possesses more professional knowledge, can independently accomplish the test alone, avoids artificial reading error, also avoids artificial uncertain factor to the influence of test. Meanwhile, multiple safety protection measures are provided, and the safety of personnel in the high-power test process is guaranteed.

In the further improvement of the application, the thermal infrared imager is fixed on the two-dimensional moving platform and can move along the X axis and the Y axis for adjustment, so that the thermal infrared imager scans according to a preset path, and the accuracy of the detected breadth and the temperature is ensured to be optimal. The industrial personal computer can acquire temperature data of the thermal infrared imager and optical power data of the pumping power meter for performance inspection, and can realize automatic control of the optical module, the thermal infrared imager and the pumping power meter by programming at the same time, so that operators do not need to have more professional knowledge, the requirement of the skill level of testers is lowered, and the testing cost is also lowered.

The audio analysis collection module can send firecrackers sound through collecting sound in the analysis and test process when the fiber burning condition occurs, and after the audio analysis collection module collects the sound, the audio analysis collection module immediately and automatically turns off laser output to protect the safety of a test system and personnel.

The whole testing process is finished in the cabinet, and the cabinet can avoid potential safety hazards caused by manual operation for a closed box body; the appearance is simple, has carried out the collection dress to main test equipment, can change different test element modules according to different model products, is convenient for remove the change.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic view of an automatic testing apparatus for a double-clad active optical fiber used in an optical fiber laser according to an embodiment of the present application.

Fig. 2 is a schematic diagram of an optical path during a 1080nm laser core loss test according to an embodiment of the present application.

Fig. 3 is a schematic optical path diagram of a pump laser cladding loss test according to an embodiment of the present application.

FIG. 4 is a schematic diagram of an optical path during a 650nm red laser loss test according to an embodiment of the present application.

Reference numerals:

1. a cabinet; 2. an optical fiber reel; 3. an optical module; 4. a photodarkening module; 5. a pump power meter; 6. an industrial personal computer; 7. a thermal infrared imager; 8. a two-dimensional moving platform; 9. an audio analysis and acquisition module; 10. a cantilever computer; 11. a camera is provided.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

In this embodiment, an automatic double-clad active fiber testing device for an optical fiber laser is provided, which includes a cabinet 1, an optical module 3, a photon darkening module 4, and an industrial personal computer 6.

As shown in fig. 1, the cabinet 1 is a vertically-placed rectangular cabinet, and is mainly divided into an upper part and a lower part, and the upper part and the lower part are respectively provided with a cabinet door capable of being opened and closed. The upper part of the cabinet 1 is a cavity for fiber testing. The optical fiber disk 2 is arranged in the upper portion of the cabinet 1, the clamp is further arranged in some embodiments, the optical fiber disk 2 is generally used for coiling a double-cladding active optical fiber to be tested and is generally arranged close to the inner cavity wall, connection of the double-cladding active optical fiber to be tested is facilitated, the clamp is generally arranged at a free position of the side wall of the inner cavity of the upper portion of the cabinet 1 and is used for clamping the optical fiber connected with a light path, and meanwhile, the plurality of clamps are arranged beside a red light power meter or a pumping power meter, and light-emitting optical fibers of the light path are conveniently tested and aligned with the power meter.

The lower part of the cabinet 1 is usually the installation position of the functional components of the industrial personal computer 6 and the photon darkening module 4, and is provided with a plurality of layers of slot positions for plugging, and the rear part of each slot position is provided with a plurality of vacant spaces for connecting a line and a light path. In some embodiments, modules such as a water cooling machine and an air cooling machine are also arranged to be inserted into the lower part of the cabinet 1, and are also inserted into the lower part of the cabinet 1, so that the integrated transportation is facilitated.

As shown in fig. 1, in some embodiments, casters and foot pads are further disposed at four corners of the cabinet 1, the foot pads can be extended and retracted to adjust the stability of the cabinet 1, and the casters facilitate the movement of the cabinet 1.

Above-mentioned optical module 3 divide into a plurality of parts, distributes around the inside wall of rack 1 upper portion, including high anti-grating, low anti-grating, coupler and shell the mould ware, when concrete implementation according to the demand seed selection wherein part or whole, in some embodiments, wherein the quantity of each part is more than one, conveniently carries out the multiunit experiment simultaneously, perhaps tests many times on different devices so that verify.

The photon darkening module 4 is mainly used for photon darkening test, is similar to a suitcase in shape, is detachably inserted into the lower half part of the cabinet 1 and is connected with a double-cladding active optical fiber to be tested through a light path structure, and two groups of pump lasers for respectively providing light sources for the high-reflection grating and the low-reflection grating and a pump power meter 5 for testing pump light matching are arranged in the photon darkening module 4. The photon darkening module 4 also comprises a red laser and a matched red power meter; the device also comprises wavelength division multiplexers connected with different lasers, wavelength division multiplexers connected with different pumping power meters 5, and a mode matcher connected with the wavelength division multiplexers and the double-cladding active optical fiber to be tested.

The pump laser also has a plurality of types with the wavelength of 1080nm, 915nm or 976nm, and the pump power meter 5 is matched with the pump laser according to the requirement, while the red laser only has the type with the wavelength of 650nm in the general embodiment, and a few embodiments also have other types.

The industrial personal computer 6 is arranged at the bottom of the cabinet 1 and used for controlling the optical module 3 and the optical darkening module to test the double-cladding active optical fiber, receiving data for calculation, and storing and outputting the data and results. The industrial personal computer 6 has a plurality of functional modules, such as motor drive, electrical control, a main control module, data calculation and the like, which are detachably inserted in the lower part of the cabinet 1, and some or all of the functional modules are used according to the requirements of a test procedure. When in updating or maintenance, the corresponding functional module can be detached to carry out corresponding work, and corresponding parts can be directly replaced when necessary to realize rapid maintenance.

In some embodiments, the industrial personal computer 6 may control the laser power test unit through the control interface and the CAN communication protocol, and after the optical fiber to be tested is welded in the test light path, the data of the power meter may be automatically collected, the test may be automatically performed item by item according to the program, the test result may be automatically judged, and the test report may be automatically output according to the test template, so as to form the electronic file. Convenient storage and printing. And the industrial personal computer 6 is in butt joint with the MES system, and uploads test data to the MES system for storage, so that information management is realized.

In some cases, temperature measurement is needed, and in the prior art, a manual handheld temperature measuring instrument is usually used for measuring temperature, but the optical fiber accumulates high temperature in the testing process, so that explosion is easily generated, and danger is caused to testing personnel.

In order to solve the above problems, in some preferred embodiments, as shown in fig. 1, the thermal infrared imager 7 moves in the cabinet 1 through the two-dimensional moving platform 8, the two-dimensional moving platform 8 is disposed at the top of the inner cavity of the upper layer of the cabinet 1 and has a pair of rails which are arranged horizontally and vertically, and the thermal infrared imager 7 slides on the rails to realize movement in two directions on the horizontal plane, so as to realize arbitrary movement on the horizontal plane. The thermal infrared imager 7 can be moved by programming the industrial personal computer 6 to scan a preset path, various paths such as an O-shaped or square block are preset in a general embodiment, and a user can modify the preset path of the industrial personal computer 6 according to specific requirements to realize an experimented scanning path.

In most embodiments, the thermal infrared imager 7 is fixed at the bottom end of the two-dimensional moving platform 8 and has a certain distance from the two-dimensional moving platform 8, and in some embodiments, the thermal infrared imager can also be connected to the bottom end of the two-dimensional moving platform 8 through a lifting device such as an air cylinder or a screw pair, so that the height can be conveniently adjusted.

The inventor finds in practice that the optical fiber generally emits a firecracker sound when an accident occurs, and generally plays a certain warning role, but in the prior art, manual detection is generally adopted, and insufficient time is provided for avoiding danger.

In order to solve the problem, in some preferred embodiments, an audio analysis and acquisition module 9 is further provided, the audio analysis and acquisition module 9 analyzes and analyzes the sound in the test process, in most cases, when the optical fiber is burnt, a firecracker sound is emitted, when the audio analysis and acquisition module 9 acquires a specific firecracker sound signal, an alarm is immediately emitted to the industrial personal computer 6, the industrial personal computer 6 immediately and automatically turns off the laser in the photon darkening module 4 and the charged device of the optical module 3, and the test system and the personnel safety are protected.

In most embodiments, the cabinet door is usually embedded with a transparent material such as glass or transparent resin in order to observe the specific conditions inside the cabinet door after the cabinet door is closed.

In some embodiments, a cantilever computer 10 is further arranged on the side wall of the cabinet 1, the cantilever computer 10 is convenient for a tester to control the industrial personal computer 6, and on the other hand, data collected by the industrial personal computer 6 can be displayed for the tester to analyze and judge.

On the other hand, in order to observe a real-time test condition, the upper portion of the cabinet 1 is provided with the camera 11, the camera 11 can transmit an observed image to the cantilever computer 10, so that a tester can observe a specific condition of the cabinet 1, and the camera 11 can receive the operation of the cantilever computer 10 to shoot images at different angles.

The cantilever computer 10 is generally hinged to the side face of the cabinet 1, and the display of the cantilever computer can also be rotatably arranged, so that the cantilever computer 10 can be placed close to the cabinet 1 when not in use, and the occupied volume of equipment can be reduced; when the device is used, corresponding adjustment can be carried out according to different positions of a user.

The application also provides an embodiment of a passive optical fiber automatic test method, which can be used for the automatic test device and comprises the following steps:

coiling the double-clad active optical fiber to be detected on an optical fiber coil 2; specifically, the double-clad active optical fiber to be tested is selected according to the index to be tested, and the double-clad active optical fiber to be tested is coiled in the groove of the optical fiber coil 2. In addition, preparatory work such as connecting the respective connection lines of the apparatus and welding the optical path is required.

Selecting an oblique efficiency test, a cladding light test or a photon darkening test of the active optical fiber through the industrial personal computer 6, and calculating and outputting a test result according to data of the pumping power meter 5; in a specific embodiment, the step of controlling the industrial personal computer 6 is as follows, before the industrial personal computer 6 is started, the light outlet of the test light path is connected to the selected power meter, the data line of the industrial personal computer 6 is connected with other devices, and preferably, the power supply of AC380V is provided for the cabinet 1; then, an air switch of the automatic testing device is turned on, the industrial personal computer 6 is started, and the testing type is selected. Preferably, for better confidentiality and management, login is carried out through an account password at the step, and in addition, an administrator is arranged for management in other embodiments.

The oblique efficiency test is obtained through two groups of pump lasers of the optical module 3 and the photon darkening module 4 and the matched pump power meter 5, and the oblique efficiency does not adopt a mold stripping device;

the cladding light test is obtained by using the optical module 3, the pumping power meter 5 and a group of pumping lasers;

the photon darkening test is obtained by adopting a photon darkening module 4 and a pumping power meter 5.

Further, after the test is finished, the industrial personal computer 6 calculates and outputs a corresponding detection result. In some embodiments, a detection report may also be automatically generated according to the retrieval result.

According to different test types selected by the industrial personal computer 6, the test process is described in detail through different embodiments respectively.

In this embodiment, the industrial personal computer 6 selects the skew efficiency test, and includes the following steps:

s11, winding a double-clad active optical fiber to be tested on an optical fiber coil, and respectively connecting a high-reflection grating and a low-reflection grating to a group of pump lasers through couplers;

s12, setting a group of gradually increased test currents. In this embodiment, a set of test currents may be setIs arranged as

And

in other embodiments, it may also be

And

and so on, the current value increasing stepwise.

Respectively testing the sum of real-time power between the high-reflection grating and the corresponding coupler and between the low-reflection grating and the corresponding coupler under each current value; specifically, in the present embodiment, the test current is selected

Supplying power to the pump source, measuring the real-time optical power of light emitted from between the coupler and the high reflecting grating

Measuring the real-time optical power of light emerging from between the low-reflection grating and the coupler

(ii) a Selecting a test current

(ii) a By analogy, select

Measuring the real-time optical power of the corresponding position

The two real-time optical powers corresponding to each current value are added according to table 1 to obtain the sum of the corresponding real-time powers.

And S13, connecting two ends of the double-clad active optical fiber to be detected with the high-reflection grating and the low-reflection grating respectively, and emitting light from the coupler on one side of the low-reflection grating to the pumping power meter 5.

S14, selecting a test current at a preset temperature

For supplying power to the pump laser, the power measured by the pump power meter 5

Sequentially selecting test currents

Respectively measured by a pump power meter 5

. The preset temperature may be obtained by setting the temperature of the water cooler, for example, to 25 ℃ for a certain time.

Preferably, when the automatic testing device has the thermal infrared imager 7, the step further includes: in the measurement of

And then, the thermal infrared imager 7 scans the double-clad active optical fiber to be detected and records the working temperature T of the double-clad active optical fiber to be detected at the moment.

S15, calculating the skew efficiency through the table 1, and presetting a preset threshold value

Efficiency of when tilting

And the double-cladding active optical fiber to be tested is qualified in the oblique efficiency test.

Preferably, the temperature set point is also preset

When the skew efficiency of the double-clad active optical fiber to be tested is measured

And the working temperature T of the double-clad active optical fiber to be measured is less

And then the double-cladding active optical fiber to be tested is qualified in the oblique efficiency test.

In the present embodiment, the skew efficiency

The calculation formula of (a) is as follows:

in other embodiments, the calculation formula may be analogized as well:

where n is the number of test currents,

the laser power value corresponding to the nth test current value,

is the n-thAnd testing the sum of real-time power corresponding to the current value.

Meanwhile, when the above steps are performed, the audio analysis and acquisition module 9 acquires sound in the cabinet 1, when the sound of fiber burning occurs, the audio analysis and acquisition module 9 gives an alarm to the industrial personal computer 6, and the industrial personal computer 6 controls the pump laser to stop supplying light after receiving the alarm.

In addition, as shown in fig. 3, the present application also provides an embodiment in which the industrial personal computer 6 selects a cladding light test, including the following steps:

and S21, connecting the high-reflection grating, the double-clad active optical fiber to be detected, the low-reflection grating and the pumping power meter 5 in sequence through light paths, and supplying light to the high-reflection grating through a group of pumping lasers through a coupler.

S22, the industrial personal computer 6 supplies power to the pump laser, the pump laser generates pump laser, the laser emits light from the output end of the low-reflection grating, and the pump power meter 5 detects the first laser power at the moment

。

S23, connecting the mold stripping device between the low-reflection grating and the pump power meter 5, supplying power to the pump laser by the industrial personal computer 6, enabling the power supply parameters to be the same as those in the step S22, and connecting the pump power meter 5 to the output end of the mold stripping device to measure second laser power

。

S24, presetting a cladding light power threshold value

By the formula

Obtaining the optical power of the cladding

When is coming into contact with

＞

And in the process, the cladding light power of the double-cladding active optical fiber to be tested is tested to be qualified, and the calculation result is output by the industrial personal computer 6, preferably, can be displayed by a display screen of the cantilever computer.

As shown in fig. 4, the present application further provides an embodiment in which the industrial personal computer 6 selects the photon darkening test, including the following steps:

and S31, sequentially connecting the optical path according to the sequence of a Wavelength Division Multiplexer (WDM), a Mode Field Adapter (MFA), the double-clad active optical fiber to be tested, the Mode adapter and the WDM.

The red optical fiber is connected with the pumping power meter 5, the pumping power meter is connected with the pumping power meter, the wavelength division multiplexer extends out a red optical fiber and is used for transmitting laser generated by the pumping laser, the red optical fiber is connected with the pumping power meter 5, a blue optical fiber is further extended out and is used for transmitting laser of the red laser, and therefore the blue optical fiber is connected with the red power meter.

S32, starting the red laser under a voltage-stabilizing condition, specifically, providing a preset voltage for the red laser, namely 2.2V voltage in the embodiment, by the industrial personal computer 6, determining the voltage according to the parameters of the selected red laser in other embodiments, and testing the power at the tail wavelength division multiplexer by the red power meter 5

And recording, after recording, the industrial personal computer 6 stops supplying power to the red laser, namely, the red laser is closedA device.

S33, turning on the pump laser, adjusting the output power of the pump laser by the industrial personal computer 6, wherein the output power is 1.3W in the embodiment, in other embodiments, determining according to the selected pump laser and the double-clad active optical fiber to be tested, recording the optical power at the tail wavelength division multiplexer by the pump power meter 5, outputting information whether power exists to the industrial personal computer 6, if power is output, starting copying, wherein the copying time is preset according to needs, and the copying time is set to be 1 hour in the embodiment.

S34, after copying is finished, the industrial personal computer 6 controls to close the pump laser, opens the red laser, provides the same voltage condition as the step S32 for the red laser, and uses the red power meter 5 to test the power of the optical fiber end at the tail wavelength division multiplexer

。

S35, presetting the light darkening effect threshold value

The industrial control computer 6 calculates the reduction percentage of the optical fiber light darkening effect

When is coming into contact with

And then, the photon darkening test of the double-cladding active optical fiber to be tested is qualified, and the industrial personal computer 6 outputs a calculation result.

The above embodiment is only a step of photon darkening test of a section of double-clad active optical fiber, and in practical application, the double-clad active optical fiber which is usually required to be tested is a whole optical fiber manufactured by a preform, the length is too long, meanwhile, the photon darkening test has a certain influence on the performance of the optical fiber, and the whole double-clad active optical fiber cannot be completely tested at one time, so that each section of the head and the tail of the optical fiber corresponding to one preform needs to be intercepted for testing, and when the two sections of the head and the tail optical fiber meet the photon darkening test, the photon darkening test of the whole double-clad active optical fiber is qualified.

Similarly, when the above steps are performed, the audio analysis and acquisition module 9 acquires sound in the cabinet 1, and when the sound of fiber burning occurs, the audio analysis and acquisition module 9 sends an alarm to the industrial personal computer 6, and the industrial personal computer 6 stops supplying power to the pump laser and the red laser after receiving the alarm, preferably, the alarm can also be sent to an operator through the cantilever computer. The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention.

Claims

1. Double-clad active optical fiber automatic testing device for optical fiber laser is characterized by comprising:

the equipment comprises a cabinet (1) and a detection device, wherein the cabinet is provided with an upper part and a lower part, and an optical fiber disc (2) for coiling a double-cladding active optical fiber to be detected is arranged on the upper part;

the optical module (3) comprises a high-reflection grating and a low-reflection grating which are connected with two ends of the double-cladding active optical fiber to be detected, and couplers are respectively arranged at the other ends of the high-reflection grating and the low-reflection grating; the optical module (3) also comprises a mould stripper;

the photon darkening module (4) comprises two groups of pump lasers and a matched pump power meter (5), wherein the two groups of pump lasers are used for respectively providing light sources for the high-reflection grating and the low-reflection grating; the device also comprises a red laser and a matched red power meter; the laser device also comprises a wavelength division multiplexer which is connected with different lasers and different pumping power meters (5), and a mode matcher which is connected with the wavelength division multiplexer and the double-clad active optical fiber to be tested;

and the industrial personal computer (6) is used for controlling the optical module (3) and the photon darkening module (4) to test the double-clad active optical fiber and calculating and outputting a test result.

2. The apparatus for automatically testing a double-clad active optical fiber for a fiber laser according to claim 1, further comprising:

the thermal infrared imager (7) is arranged at the upper part in the cabinet (1) through the two-dimensional moving platform (8), and scans in the cabinet (1) according to a preset path through the two-dimensional moving platform (8);

the thermal infrared imager (7) is also used for transmitting the detected temperature to the industrial personal computer (6).

3. The apparatus for automatically testing a double-clad active optical fiber for a fiber laser according to claim 1, further comprising:

the audio analysis and acquisition modules (9) are distributed on the inner wall of the upper part in the cabinet (1) and used for acquiring and analyzing the fiber burning sound in the test process and sending an alarm to the industrial personal computer (6) after acquisition.

4. The apparatus for automatically testing a double-clad active optical fiber for a fiber laser according to claim 1, further comprising:

the cantilever computer (10) is arranged outside the cabinet (1) and used for receiving and displaying a test result output by the industrial personal computer (6) and also used for receiving external input information and sending the external input information to the industrial personal computer (6);

the camera (11) is arranged at the upper part in the cabinet (1) and is used for transmitting the shot picture to the cantilever computer (10).

5. An automatic test method of the double-clad active optical fiber automatic test device for the optical fiber laser according to claim 1, comprising:

coiling the double-clad active optical fiber to be detected on an optical fiber coil (2);

selecting an oblique efficiency test, a cladding light test or a photon darkening test of the active optical fiber through an industrial personal computer (6), and calculating and outputting a test result according to data of the pumping power meter (5);

the oblique efficiency test is obtained through two groups of pump lasers of the optical module (3) and the photon darkening module (4) and the matched pump power meter (5), and the oblique efficiency does not adopt a mold stripping device;

the cladding light test is obtained by adopting the optical module (3), a pumping power meter (5) and a group of pumping lasers;

the photon darkening test is obtained by adopting a photon darkening module (4) and a pump power meter (5).

6. The automated testing method of claim 5, wherein the skew efficiency test comprises:

s13, connecting two ends of the double-clad active optical fiber to be tested with a high-reflection grating and a low-reflection grating respectively, and connecting a coupler on one side of the low-reflection grating to a pumping power meter (5);

s14, sequentially supplying power to the pump laser by using each current value of the test current at a preset temperature, and respectively reading the value of the pump power meter (5);

and S15, calculating the skew efficiency of the double-clad active optical fiber to be tested according to the sum of the real-time power and the value of the pump power meter (5), and testing the skew efficiency to be qualified when the skew efficiency is larger than or equal to a preset threshold value.

7. The automatic testing method according to claim 6, characterized in that the automatic testing device comprises a thermal infrared imager (7) arranged in the upper part of the cabinet (1) by means of a two-dimensional moving platform (8) and scanning in the upper part of the cabinet (1) according to a preset path by means of the two-dimensional moving platform (8);

the skew efficiency test further comprises the following steps:

and after the power is measured by the pumping power meter (5) for the last time, measuring the working temperature of the optical fiber by the thermal infrared imager, wherein the working temperature is qualified when the working temperature of the double-cladding active optical fiber to be measured is less than a preset threshold value.

8. The automated testing method of claim 5, wherein the cladding light test comprises:

s21, respectively connecting two ends of a double-clad active optical fiber to be tested into a high-reflection grating and a low-reflection grating, connecting the other end of the low-reflection grating into a pumping power meter (5), and connecting the other end of the high-reflection grating into a group of pumping lasers through a coupler;

s22, supplying light to a pump laser, and measuring a first laser power by a pump power meter (5);

s23, a mode stripper is connected between the low-reflection grating and the pump power meter (5), and the pump power meter (5) measures second laser power under the same current condition;

9. The automatic test method of claim 5, wherein a segment of the optical fiber corresponding to one preform is selected as the double-clad active optical fiber to be tested; the photon darkening test includes:

s31, connecting wavelength division multiplexers at two ends of the double-clad active fiber to be tested through mode matchers respectively, supplying light to the wavelength division multiplexer at one side through a red light laser and a pump laser, and connecting a pump power meter (5) and a red light power meter at the outlet of the wavelength division multiplexer at the other side respectively;

Recording, and closing the red laser after recording;

s33, turning on a pump laser, detecting whether optical power output exists at the red optical fiber end of the wavelength division multiplexer through a pump power meter (5), and if so, starting copying;

s34, after the time is set, copying is finished, and the pumping laser is closedStarting the red laser under a steady-state condition, measuring power with a red power meter

；

S35, passing

And

10. The automatic test method according to claim 5, characterized in that the automatic test device comprises one or more audio analysis acquisition modules (9) arranged on the upper part of the cabinet (1);

the automatic test method further comprises the following steps:

the sound in the cabinet (1) is collected through the audio analysis and collection module (9), and when the sound of fiber burning occurs, the audio analysis and collection module (9) sends an alarm to the industrial personal computer (6);

and the industrial personal computer (6) controls the optical module (3) and/or the photon darkening module (4) to stop working after receiving the alarm.