A method and apparatus for testing the water blocking properties of a glue used to seal gain fiber under aging conditions

Abstract

The application relates to the field of optical fiber testing, and provides a water resistance testing method and device for sealing glue of gain optical fiber under aging conditions, wherein the water resistance testing method of the glue is achieved by placing gain optical fiber and a humidity indicating card in two box bodies respectively, coating glue with consistent thickness on a top cover matched with the box bodies, then placing the two box bodies into an experiment box for aging test, taking out the gain optical fiber after a period of time and placing the gain optical fiber in the light path of an optical fiber laser, obtaining the transmission loss increase value Delta of the gain optical fiber and reading the indication value D of the humidity indicating card, and based on the transmission loss increase value Delta and the indication value D, the water resistance performance of the glue under the aging conditions is judged by double results whether the water resistance performance is qualified. The testing method can improve the accuracy of testing the sealed gain optical fiber under the simulated use environment of the gain optical fiber, and the testing method is simple.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical fiber testing, in particular to a water resistance testing method and device for sealing glue of gain optical fiber under aging conditions. BACKGROUND

[0002] The gain optical fiber is a necessary component of the optical fiber laser, which plays a role in the optical fiber laser: 1) as a medium to convert pump light power into laser, 2) to form a laser resonant cavity with other devices. Currently, the gain optical fiber usually selects a double-clad doped optical fiber, and the coating layer material thereof is mainly high-temperature-resistant acrylic resin or polyimide resin, etc. These two resins have good processing forming performance, temperature resistance and mechanical properties, but the effect of resisting water vapor is not strong, and they are easy to absorb water and swell or deform in humid air, resulting in a decrease in the ability to protect the inner fiber. Studies have shown that long-term water vapor erosion of the optical fiber will cause the attenuation of the optical power. The mechanism is that the free water entering the optical fiber will cause absorption loss on one hand, and will damage the chemical bond between Si and O atoms, causing damage to the microstructure of the optical fiber and thus causing loss.

[0003] Under the background of the current development of high-power optical fiber lasers, the beam power loaded by the gain optical fiber as an energy channel is getting larger and larger, and the heat energy converted by it is also getting higher and higher. Therefore, the gain optical fiber is used in the form of being closely attached to the water cooling plate to conduct away the heat energy. Due to the existence of the water cooling plate, the water in the air may form condensed water attached to the surface of the water cooling plate and the gain optical fiber because of the temperature difference. This free water in the air or crystalline water formed by condensation will cause damage to the gain optical fiber. In order to prevent the gain optical fiber from being eroded by water vapor, laser manufacturers usually adopt two means of passive defense or active defense. The passive defense method refers to increasing the cooling water temperature to reduce the temperature difference with the environment and reduce the formation of condensed water. The active defense means is to seal a layer of silica gel on the surface of the gain optical fiber to achieve the effect of resisting water vapor and condensed water. The active sealing of silica gel is the most widely adopted solution at present. However, due to the thermal effect of the gain optical fiber in the process of long-term use of the laser, the silica gel will continue to age. Therefore, the water resistance of the glue in long-term use will directly affect the service life of the laser. SUMMARY

[0004] Based on this, the present application provides a water resistance testing method and device for sealing glue of gain optical fiber under aging conditions, to effectively evaluate the water resistance of the glue and find reliable glue for sealing gain optical fiber, thereby prolonging the working life of the gain optical fiber.

[0005] In a first aspect, the embodiments of the present application provide a water resistance testing method for sealing glue of gain optical fiber under aging conditions, comprising the steps of:

[0006] S11, place the gain optical fiber into the optical path of the fiber laser to test initial transmission loss a0 of the gain optical fiber;

[0007] S12, prepare two boxes, a first box and a second box, and evenly coat the glue to be tested on the top cover of the box, wherein the top cover is provided with at least one channel;

[0008] S13, take out the gain optical fiber in the fiber laser, and place the gain optical fiber into the first box, while placing the humidity indicating card into the second box, and covering the first top cover coated with the glue to be tested on the first box to form a sealed structure, covering the second top cover coated with the glue to be tested on the second box to form a sealed structure, and placing the sealed first box and second box in the experiment box for aging, wherein the experiment box is provided with working parameters according to the aging requirement;

[0009] S14, take out the gain optical fiber from the first box after a period of time, and place the taken-out gain optical fiber into the optical path of the fiber laser to test the transmission loss at of the taken-out gain optical fiber, and obtain the transmission loss increase value delta of the gain optical fiber, while reading the indication number D of the humidity indicating card in the second box;

[0010] S15, according to the transmission loss increase value delta and the indication number D, double-judge whether the waterproof performance of the glue under the aging condition is qualified, wherein delta = at-a0.

[0011] In the second aspect, the embodiment of the present application provides a waterproof property testing device for the glue for sealing the gain optical fiber under the aging condition, comprising a fiber laser and an experiment box, wherein the experiment box is provided with at least two boxes, a first box and a second box, the first box is provided with the gain optical fiber, the second box is provided with the humidity indicating card, the first box is covered with the first top cover matched therewith, the second box is covered with the second top cover matched therewith, at least one channel is arranged on the first top cover and the second top cover, and the first top cover and the second top cover are used for covering the glue.

[0012] The present application has the following advantages:

[0013] The embodiment of the present application provides a waterproof property testing method for the glue for sealing the gain optical fiber under the aging condition, comprising the following steps: S11, placing the gain optical fiber into the optical path of the fiber laser to test initial transmission loss a0 of the gain optical fiber;

[0014] S12, two boxes are prepared, respectively, the first box, the second box, the glue to be tested is evenly coated on the top cover of the first box and the second box, at least one channel is arranged on the top cover; S13, the gain optical fiber in the optical fiber laser is taken out, and the gain optical fiber is placed in the first box, meanwhile, the humidity indicating card is placed in the second box, the first top cover coated with the glue to be tested is covered on the first box matched with the first top cover, so that the first box forms a sealed structure, the second top cover coated with the glue to be tested is covered on the second box matched with the second top cover, so that the second box forms a sealed structure, and the sealed first box and second box are placed in the experiment box for aging, the experiment box is provided with working parameters according to the aging requirement; S14, the gain optical fiber is taken out from the first box after a period of time, and the taken-out gain optical fiber is placed in the optical path of the optical fiber laser, the transmission loss αt of the taken-out gain optical fiber is tested, the transmission loss increase value Δ of the gain optical fiber is obtained, and the indication number D of the humidity indicating card in the second box is read; S15, according to the transmission loss increase value Δ and the indication number D, whether the water blocking performance of the glue under the aging condition is qualified is judged, wherein Δ = αt-α0. Compared with the prior art, the water blocking test method in the application can simulate the use environment of the gain optical fiber by using the device, and combines the water blocking test with the damp heat aging, so that the test method is simple, the investment cost is low, and the accuracy is high.

[0015] In addition, the embodiment of the application further provides a water blocking test device for the glue for sealing the gain optical fiber under the aging condition, which comprises an optical fiber laser and an experiment box, at least two boxes are arranged in the experiment box, respectively, a first box and a second box, the first box is provided with the gain optical fiber, the second box is provided with the humidity indicating card, the first top cover matched with the first box is covered on the first box, the second top cover matched with the second box is covered on the second box, at least one channel is arranged on the first top cover and the second top cover, and the first top cover and the second top cover are used for covering the glue. Compared with the prior art, the water blocking test device has a simple structure, can simulate the use environment of the gain optical fiber, and further improves the accuracy of the above-mentioned water blocking test method. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0017] Figure 1The embodiment of the present application provides a flow chart of a water resistance test method for sealing glue of a gain optical fiber under an aging condition.

[0018] Figure 2 The optical path diagram of the optical fiber laser provided by the first embodiment of the present application is shown in the figure.

[0019] Figure 3 Based on Figure 2 The structural diagram of the middle top cover covering the box body is shown in the figure.

[0020] Figure 4 The structural diagram of the water resistance test device for sealing glue of a gain optical fiber under an aging condition provided by the embodiment of the present application is shown in the figure.

[0021] Figure 5 The optical path diagram of the optical fiber laser provided by the second embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work fall within the protection scope of the present application.

[0023] It should be noted that when an element is described as being "provided on" / "disposed on" another element, it can be directly on the other element, or one or more intermediate elements can be present therebetween. In addition, in the specification, the "first", "second" designations do not limit the data and execution order, and only distinguish items with basically the same function and effect or similar items. The present application defines the position of components with reference to the output / emission direction of signal light, and the input end and the output end refer to the input end and the output end of signal light, unless the input and output of pump light are specifically indicated. For example, as shown in the figure, the pump output end of the pump source 26 is connected with the pump input end of the beam combiner 27. Figure 5

[0024] Specifically, the embodiments of the present application are further described below in combination with the accompanying drawings.

[0025] Embodiment one

[0026] The water resistance test method for sealing glue of a gain optical fiber under an aging condition provided by the embodiment of the present application is shown in the figure, and includes the steps shown in the figures. Figure 1 Figure 2 Figure 3

[0027] ​​​​S11, place the gain optical fiber 22 in the optical path of the fiber laser, test the initial transmission loss a0 of the gain optical fiber 22.

[0028] The step S11 is specifically placing the gain optical fiber 22 in the optical path of the fiber laser, controlling the input laser of the fiber laser, recording the first initial input power P10 of the input laser, and testing the first actual output power P11 of the output laser after the output laser of the laser stabilizes, to obtain the initial transmission loss a0, wherein a0=P10-P11.

[0029] Further, in combination with Figure 2 The optical path diagram of the fiber laser is shown, the fiber laser comprises a control mainboard (not shown), a laser source 21, a gain optical fiber 22, a mode stripper 23, a laser output head 24, and a power meter 25 arranged in sequence along the laser output direction, and the control mainboard (not shown) is connected with the laser source 21. The control mainboard (not shown) controls the laser source 21 to emit laser, records the first initial input power P10 of the input laser, and tests the first actual output power P11 of the output laser after the output laser of the laser output head 24 stabilizes.

[0030] S12, prepare two boxes, namely a first box and a second box, and evenly coat the to-be-tested glue on the top cover of the first box and the second box, and the top cover is provided with at least one channel.

[0031] Further, as shown in Figure 3 In order to facilitate the control of the to-be-tested glue 10 coated on the top cover 12 according to the specified thickness and area, the top cover 12 is provided with a sunken accommodation cavity (not indicated) along the closing direction, the bottom of the accommodation cavity (not indicated) is provided with at least one channel 13 which is communicated with the inside of the box 14. In order to tightly close the top cover 12 and the box 14 together, a sealing ring 16 is arranged at the joint of the box 14 and the top cover 12. The thickness of the glue coated on the first top cover and the second top cover is consistent.

[0032] S13, take out the gain optical fiber 22 in the fiber laser, and place the gain optical fiber into the first box, at the same time, place the humidity indicating card (not shown) into the second box, close the first top cover coated with the to-be-tested glue on the first box matched therewith to form a sealed structure of the first box, close the second top cover coated with the to-be-tested glue on the second box matched therewith to form a sealed structure of the second box, and place the sealed first box and second box in an experiment box for aging, and the experiment box is provided with working parameters according to the aging requirement.

[0033] Among them, as shown in Figure 4As shown, the working parameters of the experiment box 2 include temperature and humidity, the temperature is 50-90℃, the humidity is 50%-90%, the second sealed gain fiber is placed in the experiment box for 150-800 hours.

[0034] S14, after a period of time, the gain fiber 22 is taken out from the first box, and the taken-out gain fiber is placed in the optical path of the fiber laser, the transmission loss α1 of the taken-out gain fiber is tested, the transmission loss increasing value Δ of the gain fiber is obtained, and the indication number D of the humidity indicating card (not shown) in the second box is read.

[0035] Specifically, in the step S14, after a period of time, the gain fiber 22 is taken out from the first box, and the taken-out gain fiber 22 is placed in the fiber laser, and the transmission loss α1 of the taken-out gain fiber is tested, which is specifically combined with Figure 2 As shown, the gain fiber 22 aged in the experiment box 2 for a period of time is taken out and placed in the optical path of the fiber laser, the input laser of the fiber laser is controlled, the second initial input power P20 is recorded, and the second output power P21 of the output laser of the fiber laser after stabilization is tested, the transmission loss αt is obtained, where αt=P20-P21, and the transmission loss increasing value Δ is calculated, where the transmission loss increasing value Δ=αt-α0.

[0036] According to experience, as the temperature increases, the coating layer (glue) of the gain fiber is more easily damaged, which will cause the water resistance of the gain fiber to become poor; as the humidity increases, the gain fiber surface is more likely to be covered with water droplets, which will cause the water resistance of the gain fiber 22 to become poor; similarly, when the gain fiber 22 is placed in a high temperature and high humidity environment, as the time increases, the coating layer of the gain fiber 22 is more easily damaged. Based on this, in order to facilitate and simplify the test, the temperature of the experiment box 2 is adjusted to 85℃, the humidity is adjusted to 85℃, and the gain fiber 22 is taken out after being placed in the experiment box 2 for 200 hours.

[0037] S15, according to the transmission loss increasing value Δ and the indication number D, it is determined whether the water resistance of the glue under the aging condition is qualified.

[0038] The step S15 is specifically that the indicating number D of the humidity indicating card is directly observed by observation method, if the indicating number D is large, it can be directly judged that the waterproof performance of the glue is unqualified, and the transmission loss increase value Δ can not be calculated. If the indicating number D is moderate or small, the transmission loss increase value Δ is further calculated, if the transmission loss increase value Δ is small, the glue meets the demand, and the waterproof performance of the glue for the gain optical fiber 22 is further accurately obtained. If the transmission loss increase value Δ is large, it indicates that the humidity indicating card has a large aging test error in the test, at this time, the test needs to be re-performed. This is because the indicating number D of the humidity indicating card is generally smaller, and the transmission loss increase value Δ is also smaller.

[0039] It should be noted that in the embodiment, the humidity indicating card in the step S14 has six color scales, and in the environment where the humidity gradually increases, the corresponding six scale positions will change from blue to pink, each color corresponds to an indicating number D, and the box body is made of transparent material. If the humidity indicating card changes color after absorbing moisture, corresponding to the 5th and / or 6th scale, it indicates that the waterproof performance of the to-be-tested glue 10 is poor, and the moisture in the outside enters the box body 14 through the to-be-tested glue 10 and the hole 13. Therefore, when selecting the to-be-tested glue with appropriate waterproof performance in the embodiment of the application, the color change range of the humidity indicating card corresponding to the 1st to 3rd scales can meet the demand.

[0040] In order to quickly find the glue with good waterproof performance and reduce the selection range of the glue, the step S11 further includes the step S10 of selecting the to-be-tested glue with appropriate waterproof performance before the step S11.

[0041] Further, as shown in Figure 3 and Figure 4 , the step S10 is specifically:

[0042] S101, uniformly coating the to-be-tested glue 10 on the third top cover 12, and the third top cover 12 is provided with at least one hole 13.

[0043] S102, placing the water absorption test material 15 in the third box body 14, covering the third top cover 12 on the third box body 15, so that the third box body 14 forms a sealed structure, and placing the sealed third box body 14 in the experiment box 2 for aging.

[0044] S103, testing the waterproof performance of the to-be-tested glue by the water absorption test material, and selecting the to-be-tested glue with appropriate waterproof performance.

[0045] It should be noted that the sealed third box body 14 in step S102 is placed in the experimental box 2, and the experimental box 2 is provided with working parameters consistent with those in step S13 according to the aging requirement, the temperature is 85℃, the humidity is 85℃, and the aging test is 200 hours.

[0046] Further, the hygroscopic test material in step S102 is a desiccant; step S102 specifically includes weighing the mass of the desiccant as M0, placing the desiccant in the third box body, covering the third top cover on the third box body adapted thereto to form a sealed structure, and placing the sealed third box body in the experimental box 2 for aging; step S103 specifically includes taking out the desiccant after the third box body is aged in the experimental box for a period of time, weighing the mass of the taken-out desiccant as Mt, obtaining the moisture absorption percentage θ, and selecting the water-blocking suitable test glue, wherein θ = (Mt-M0) / M0. Wherein, θ = (Mt-M0) / M0, the smaller the moisture absorption percentage θ, the better the water-blocking property of the test glue. According to experience, controlling the moisture absorption percentage θ within 50% can select a more suitable test glue.

[0047] In some embodiments, the desiccant commonly used in step S102 includes calcium sulfate, calcium chloride, silica gel, and activated alumina.

[0048] Further, for example, the water-blocking property of a glue is tested in this embodiment, a desiccant such as calcium chloride is used to preliminarily judge the water-blocking property of the test glue, after the aging test, the moisture absorption percentage θ of the test glue is 0%, further, after the aging test, the gain fiber transmission loss increase value Δ in the first box body is calculated as 0.05, at the same time, the color change of the humidity indicating card in the second box body is observed, it is found that the color of the humidity indicating card has no obvious change, and it still shows blue, corresponding to 1 grade, that is, the water-blocking property of the test glue is good, at the same time, according to the fact that the aged gain fiber is placed in the optical path of the fiber laser, the second initial input power P20 of the input thereof is recorded, and the second output power P21 of the output laser of the stable output of the fiber laser is tested, the power attenuation of the fiber laser is obtained as 3%, that is, the water-blocking property of the glue tested in this embodiment is very good.

[0049] For example, in the present embodiment, another glue is tested for water resistance, a desiccant such as calcium chloride is used to preliminarily determine the water resistance of the tested glue, after aging test, the moisture absorption percentage θ of the tested glue is tested to be 25%, further, after aging test, the gain fiber transmission loss increase value Δ in the first box is calculated to be 0.12, meanwhile, the color change of the humidity indicator card in the second box is observed, it is found that the color of the humidity indicator card gradually changes from blue to pink, corresponding to 3 grades, that is, the water resistance of the tested glue is good, meanwhile, the second initial input power P20 of the gain fiber in the optical path of the fiber laser is recorded, and the second output power P21 of the output laser of the fiber laser after stabilization is tested, the power attenuation of the fiber laser is obtained to be 15%, that is, the water resistance of the tested another glue is very good.

[0050] For example, in the present embodiment, another glue is tested for water resistance, a desiccant such as calcium chloride is used to preliminarily determine the water resistance of the tested glue, after aging test, the moisture absorption percentage θ of the tested glue is tested to be 25%, further, after aging test, the gain fiber transmission loss increase value Δ in the first box is calculated to be 0.12, meanwhile, the color change of the humidity indicator card in the second box is observed, it is found that the color of the humidity indicator card gradually changes from blue to pink, corresponding to 3 grades, that is, the water resistance of the tested glue is good, meanwhile, the second initial input power P20 of the gain fiber in the optical path of the fiber laser is recorded, and the second output power P21 of the output laser of the fiber laser after stabilization is tested, the power attenuation of the fiber laser is obtained to be 15%, that is, the water resistance of the tested another glue is very good.

[0051] In addition, the present embodiment further provides a water resistance testing device for sealing glue of gain fiber under aging condition, which is tested by using the water resistance testing method for sealing glue of gain fiber under aging condition. Figures 2 to 4 As shown in the figure, the water resistance testing device comprises a fiber laser and an experimental box 2, the experimental box 2 is provided with at least two boxes 14, which are a first box and a second box, the first box is provided with a gain fiber 22, the second box is provided with a humidity indicator card 15, the first box is provided with a first top cover matched therewith, the second box is provided with a second top cover matched therewith, at least one hole 13 is arranged on the first top cover and the second top cover, and the first top cover and the second top cover are used to cover the glue 10.

[0052] Furthermore, in order to quickly find adhesives with good water resistance and reduce the range of adhesives to be screened, this embodiment also includes a third box and a third top cover adapted to it.

[0053] Furthermore, the top cover 12 has a recessed receiving cavity (not shown) along the closing direction, and the bottom of the receiving cavity (not shown) has at least one channel 13, which communicates with the interior of the box body 14. In order to ensure that the top cover 12 and the box body 14 are tightly closed together, a sealing ring 16 is provided at the joint between the box body 14 and the top cover 12.

[0054] Furthermore, the optical path of the fiber laser, such as Figure 2 As shown, it includes: a control motherboard (not shown), a laser source 21, a first sealed gain fiber 22, a mode stripper 23, a laser output head 24, and a power meter 25 arranged sequentially along the laser output direction. The control motherboard (not shown) is connected to the laser source 21.

[0055] Example 2

[0056] Unlike Embodiment 1, Embodiment 2 provides a testing method for adhesive used to seal gain fibers under aging conditions. Specifically, step S11 involves placing the gain fiber in the optical path of a fiber laser, controlling the input pump light of the fiber laser, recording the initial input pump light power P13, and testing the first actual output power P14 after the laser has stabilized and output laser light, obtaining the initial transmission loss α0, where α0 = P13 - P14. In step S14, after a certain period of time, the gain fiber is removed from the first housing. The removed gain fiber is placed in the fiber laser. The transmission loss αt of the removed gain fiber is tested. Specifically, the gain fiber, which has been aged in the experimental chamber for a period of time, is taken out and placed in the optical path of the fiber laser. The fiber laser is controlled to input pump laser, and the second initial input pump light power is recorded as P23. The second output power P24 after the fiber laser outputs a stable laser is tested, and the transmission loss αt is obtained, where αt = P23 - P24. The loss increase value Δ is calculated, where the transmission loss increase value Δ = αt - α0.

[0057] Specifically, in combination Figure 5The optical path diagram of the fiber laser includes a control mainboard (not shown), a pump source 26, a beam combiner 27, a high-reflection fiber grating 28, a gain fiber 22, a low-reflection fiber grating 29, a mode stripper 23, a laser output head 24, a power meter 25 arranged in sequence along a laser output direction, the control mainboard (not shown) is connected with the pump source 26, and a pump output end of the pump source 26 is connected with a pump input end of the beam combiner 27. The control mainboard (not shown) controls the pump source 26 to emit pump light, records a first initial input pump power P13 of the input pump light, and tests a first actual output power P14 of the output laser of the laser output head 24 after the laser is stabilized.

[0058] Further, for example, the water resistance of a glue is tested in the embodiment, a desiccant such as calcium sulfate is used to preliminarily judge the water resistance of the tested glue, after aging test, the moisture absorption percentage θ of the glue is tested to be 10%, further, after the aging test, the gain fiber transmission loss increase value Δ in the first box body is calculated to be 0.07, meanwhile, the color change of the humidity indicating card in the second box body is observed, it is found that the color of the humidity indicating card has no obvious change, and still shows blue, corresponding to 1 grade, that is, the water resistance of the tested glue is good, meanwhile, the aged gain fiber is placed in the optical path of the fiber laser, the second initial input pump power P23 is recorded, and the second output power P24 of the output laser of the fiber laser after the laser is stabilized is tested, the optical-to-optical conversion efficiency of the fiber laser is obtained to be 70%, that is, the water resistance of the tested glue is very good.

[0059] For example, the water resistance of another glue is tested in the embodiment, a desiccant such as calcium sulfate is used to preliminarily judge the water resistance of the tested glue, after aging test, the moisture absorption percentage θ of the glue is tested to be 30%, further, after the aging test, the gain fiber transmission loss increase value Δ in the first box body is calculated to be 0.15, meanwhile, the color change of the humidity indicating card in the second box body is observed, it is found that the color of the humidity indicating card has no obvious change, and still shows blue, corresponding to 3 grade, that is, the water resistance of the tested glue is good, meanwhile, the aged gain fiber is placed in the optical path of the fiber laser, the second initial input pump power P23 is recorded, and the second output power P24 of the output laser of the fiber laser after the laser is stabilized is tested, the optical-to-optical conversion efficiency of the fiber laser is obtained to be 65%, that is, the water resistance of the tested glue is very good.

[0060] For example, in the present embodiment, the water resistance of another glue is tested, and a desiccant such as calcium chloride is used to preliminarily determine the water resistance of the tested glue. After the aging test, the moisture absorption percentage θ of the tested glue is 80%, and the water resistance of the tested another glue is not good. In the present embodiment, in order to further verify the water resistance of the another glue, after the aging test, the gain fiber transmission loss increase value Δ in the first box is calculated to be 0.18, and the color change of the humidity indicating card in the second box is observed. It is found that the color of the humidity indicating card gradually changes from blue to pink, corresponding to 5 grades, that is, the water resistance of the tested glue is not good. At the same time, according to the fact that the aged gain fiber is placed in the optical path of the fiber laser, the second initial input pump light power P23 is recorded, and the second output power P24 of the fiber laser after the output laser is stabilized is tested, and the optical-optical conversion efficiency of the fiber laser is 50%, that is, the water resistance of the tested another glue is not good.

[0061] In addition, the second embodiment provides a device for testing the water resistance of the glue for sealing the gain fiber under the aging condition. Different from the first embodiment, as shown in Figure 5 The optical path of the fiber laser in the second embodiment includes a control mainboard (not shown), a pump source 26, a beam combiner 27, a high-reflection fiber grating 28, a first sealed gain fiber 22, a low-reflection fiber grating 29, a mode stripper 23, a laser output head 24, a power meter 25 arranged in the laser output direction in sequence, and the control mainboard (not shown) is connected with the pump source 26, and the pump output end of the pump source 26 is connected with the pump input end of the beam combiner 27.

[0062] In summary, the embodiment of the present application provides a kind of water resistance test method for sealing glue of gain optical fiber under aging condition, comprising the following steps: S11, the gain optical fiber is placed in the optical path of fiber laser, and the initial transmission loss α of the gain optical fiber 0 is tested;S12, prepare two box bodies, respectively first box body, second box body, the glue to be tested is evenly coated on the top cover of box body, at least one channel is provided on the top cover;S13, the gain optical fiber in the fiber laser is taken out, and the gain optical fiber is placed in the first box body, while the humidity indicating card is placed in the second box body, and the first top cover coated with the glue to be tested is covered on the first box body adapted thereto, so that the first box body forms a sealed structure, the second top cover coated with the glue to be tested is covered on the second box body adapted thereto, so that the second box body forms a sealed structure, and the sealed first box body and second box body are placed in experimental box and are aged, and the experimental box is provided with working parameters according to aging requirement;S14, after a period of time, the gain optical fiber is taken out from the first box body, and the gain optical fiber after taking out is placed in the optical path of the fiber laser, and the transmission loss α of the gain optical fiber after taking out is tested, to obtain the transmission loss increase value Δ of the gain optical fiber, while the indicating number D of the humidity indicating card in the second box body is read;S15, according to the transmission loss increase value Δ and the indicating number D, whether the water resistance of the glue under aging condition is qualified is judged, wherein Δ=αt-α0.Compared with prior art, the water resistance test method in the embodiment of the present application can simulate the use environment of gain optical fiber, improve the accuracy of testing sealed gain optical fiber, and the test method is simple.

[0063] In addition, the embodiment of the present application also provides a kind of water resistance test device for sealing glue of gain optical fiber under aging condition, comprising: fiber laser and experimental box 2, at least two box bodies 14 are provided in the experimental box 2, respectively first box body, second box body, the gain optical fiber 22 is loaded in the first box body, the humidity indicating card 15 is loaded in the second box body, the first top cover adapted thereto is covered on the first box body, the second top cover adapted thereto is covered on the second box body, at least one channel is provided on the first top cover and the second top cover, and the first top cover and the second top cover are used to cover the glue.Compared with prior art, the water resistance test device is simple in structure, can simulate the use environment of sealed gain optical fiber, and further improve the accuracy of the above-mentioned water resistance test method.

[0064] The above describes in detail the water blocking test method and device for the glue for sealing the gain optical fiber under the aging condition provided by the embodiment of the present application. The principles and implementation manners of the present application are described by using specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea. Meanwhile, for those skilled in the art, the specific implementation manners and application ranges will be changed according to the idea of the present application. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A method for testing the water blocking property of a glue used for sealing a gain optical fiber under aging conditions, characterized in that, The method comprises the steps of: S11, placing a gain optical fiber into the optical path of a fiber laser to test initial transmission loss α0 of the gain optical fiber; S12, preparing two boxes, i.e., a first box and a second box, and uniformly applying a to-be-tested glue on the top covers of the first box and the second box, wherein the top covers are provided with at least one channel; S13, taking out the gain optical fiber in the fiber laser, placing the gain optical fiber into the first box, placing a humidity indicating card into the second box, and covering the first top cover coated with the to-be-tested glue on the first box to form a sealed structure of the first box, covering the second top cover coated with the to-be-tested glue on the second box to form a sealed structure of the second box, and placing the sealed first box and second box in an experimental box for aging, wherein the experimental box is provided with working parameters according to aging requirements; S14, taking out the gain optical fiber from the first box after a period of time, placing the taken-out gain optical fiber into the optical path of the fiber laser, testing transmission loss αt of the taken-out gain optical fiber, obtaining an increase value Δ of the transmission loss of the gain optical fiber, and reading an indication D of the humidity indicating card in the second box; S15, judging whether the water-blocking performance of the glue under the aging condition is qualified according to the increase value Δ of the transmission loss and the indication D, wherein Δ = αt-α0, the humidity indicating card has six grades of color development, and the corresponding six grades of positions change from blue to pink in color in an environment with gradually increasing humidity, each color corresponds to an indication D, and the color change range of the humidity indicating card corresponds to 1-3 grades which can meet the requirements.

2. The water blocking test method for the sealant for a sealed gain optical fiber under aging conditions according to claim 1, wherein Before step S11, the method further comprises the step of S10, i.e., selecting a to-be-tested glue with appropriate water-blocking performance.

3. The water blocking property test method for the glue for sealing a gain optical fiber under an aging condition according to claim 2, characterized by, The step S10 specifically comprises: S101, uniformly applying the to-be-tested glue on a third top cover, wherein the third top cover is provided with at least one channel; S102, placing a water-absorbing test material in a third box, covering the third top cover on the third box to form a sealed structure of the third box, and placing the sealed third box in the experimental box for aging; S103, testing the water-blocking performance of the to-be-tested glue through the water-absorbing test material, and selecting a to-be-tested glue with appropriate water-blocking performance.

4. The water blocking property test method for the glue for sealing a gain optical fiber under an aging condition according to claim 1, wherein The step S11 specifically comprises placing the gain optical fiber into the optical path of the fiber laser, controlling input laser of the fiber laser, recording a first initial input power P10 of the input laser, testing a first actual output power P11 of the output laser after the laser stabilizes, and obtaining the initial transmission loss α0, wherein α0=P10-P11.

5. The water blocking test method for the sealant for a sealed gain optical fiber under aging conditions according to claim 4, wherein In step S14, the transmission loss α1 of the taken-out gain optical fiber is tested by placing the taken-out gain optical fiber into the fiber laser. The gain optical fiber aged in the experiment box for a period of time is taken out and placed in the optical path of the fiber laser, the input laser of the fiber laser is controlled, the second initial input power P20 of the input laser is recorded, the second output power P21 of the output laser of the fiber laser after stabilization is tested, the transmission loss αt is obtained, where αt=P20-P21, and the transmission loss increase value Δ is calculated, Δ=αt-α0.

6. The water blocking property test method for the sealant for a sealed gain optical fiber under aging conditions according to claim 1, wherein The step S11 is specifically that the gain optical fiber is placed in the optical path of the fiber laser, the input pump light of the fiber laser is controlled, the first initial input pump light power P13 of the input pump light is recorded, the first actual output power P14 of the output laser of the fiber laser after stabilization is tested, and the initial transmission loss α0 is obtained, where α0=P13-P14.

7. The water blocking property test method for the glue for sealing a gain optical fiber under an aging condition according to claim 6, wherein The gain optical fiber is taken out from the first box body after a period of time in the step S14, and the taken-out gain optical fiber is placed in the fiber laser, and the transmission loss α1 of the taken-out gain optical fiber is tested, which is specifically that The gain optical fiber aged in the experiment box for a period of time is taken out and placed in the optical path of the fiber laser, the input pump light of the fiber laser is controlled, the second initial input pump light power P23 of the input pump light is recorded, the second output power P24 of the output laser of the fiber laser after stabilization is tested, the transmission loss αt is obtained, where αt=P23-P24, and the loss increase value Δ is calculated, Δ=αt-α0.

8. The water blocking property test method for the sealant for a sealed gain optical fiber under an aging condition according to claim 3, wherein The test material with water absorption in the step S102 is a desiccant; The step S102 is specifically that the mass of the desiccant is weighed as M0, the desiccant is placed in the third box body, the third top cover is covered on the third box body adapted thereto, the box body forms a sealed structure, and the sealed third box body is placed in the experiment box for aging; The step S103 is specifically that the desiccant is taken out after the third box body is aged in the experiment box for a period of time, the mass Mt of the taken-out desiccant is weighed, the moisture absorption percentage θ is obtained, and the glue with suitable water resistance is selected for testing, where θ=(Mt-M0) / M0.

9. A device for testing the water blocking property of a glue for sealing a gain optical fiber under aging conditions, tested by using the method for testing the water blocking property of a glue for sealing a gain optical fiber under aging conditions according to any one of claims 1 to 8, characterized in that, Comprise: A fiber laser and an experiment box, the experiment box is provided with at least two box bodies, which are a first box body and a second box body, the first box body is provided with a gain optical fiber, the second box body is provided with a humidity indicating card, the first box body is provided with a first top cover adapted thereto, the second box body is provided with a second top cover adapted thereto, at least one hole is arranged on the first top cover and the second top cover, and the first top cover and the second top cover are used for covering the glue.

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