CN112146846B - Device and method for measuring performance of optical fiber at high temperature - Google Patents
Device and method for measuring performance of optical fiber at high temperature Download PDFInfo
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- CN112146846B CN112146846B CN202010943739.1A CN202010943739A CN112146846B CN 112146846 B CN112146846 B CN 112146846B CN 202010943739 A CN202010943739 A CN 202010943739A CN 112146846 B CN112146846 B CN 112146846B
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Abstract
The invention discloses a device and a method for measuring the performance of an optical fiber at high temperature. The device comprises an all-fiber testing system and a high-temperature furnace system, wherein the all-fiber testing system comprises detection light (or pumping light), a connecting optical fiber, a light splitter, a light beam combiner, an optical isolator, an optical fiber to be detected, a detecting device and other components; the device comprises a high-temperature furnace system heat-preservation cavity, heated gas, a heated gas inlet, a heated gas outlet, a gas fan, a temperature detector, a gas pipeline, a pipeline switch, a gas heating device, a gas cooling device, a gas pump, an optical fiber objective table, an optical fiber inlet to be detected, an optical fiber outlet to be detected and the like. During testing, the optical fiber to be tested is placed in a high-temperature furnace system, a test light path is built in sequence, then the heat-insulating cavity in the high-temperature furnace is subjected to evacuation treatment (the internal humidity and cleanliness of the cavity meet the experimental requirements), the heat-insulating cavity is sealed, finally the internal temperature of the cavity reaches the temperature required by testing, and the optical fiber to be tested is measured at the same time.
Description
Technical Field
The invention belongs to the technical field of optical fiber measurement, and particularly relates to a device and a method for measuring the performance of an optical fiber at high temperature.
Background
With the development of technology, special optical fibers are widely used in the fields of industrial processing, medical treatment, aerospace, military and the like, and the optical fibers are generally tested at room temperature unless some specific aging or stability experiment test is carried out (the test temperature is generally not more than 100 ℃). However, in the field of fiber lasers, the rare earth doped fiber, the passive matching fiber and the large-core diameter fiber used need to generate or transmit high-power laser, the temperature of the fiber core of the fiber is extremely high (more than hundreds of ℃) due to the loss of the fiber, and although the air cooling or water cooling treatment is carried out on the fiber in order to protect the performance of the fiber (the temperature of the coating layer of the general fiber cannot exceed 80 ℃) in the use process, the working temperature of the fiber core of the fiber usually reaches 100-. The existing measurement of loss of passive matching optical fiber and large-core optical fiber and loss, absorption coefficient, conversion efficiency, optical darkening, beam quality and mode of rare earth-doped optical fiber is still carried out at room temperature, and the performance of the optical fiber in the using process cannot be well reflected.
Taking the absorption and emission spectra of the rare-earth doped fiber as an example, the absorption and emission peak intensities, peak wavelengths and spectrum shapes of rare-earth ions are different at different temperatures. In addition, photodarkening and bleaching of the rare earth-doped optical fiber, unstable mode under high power and the like are all related to the temperature of the optical fiber.
Disclosure of Invention
In view of the above-identified deficiencies in the art or needs for improvement, the present invention provides an apparatus and method for measuring the performance of an optical fiber at high temperatures. The device and the method can be used for measuring optical properties of the optical fiber at different temperatures, such as loss, emission absorption spectrum, optical darkening, mode instability and the like.
To achieve the above objects, according to one aspect of the present invention, there is provided an apparatus for measuring the performance of an optical fiber at high temperature, the apparatus comprising a set of all-fiber test systems and a set of high-temperature furnace systems;
the all-fiber testing system comprises components such as detecting light (or pumping light), connecting optical fiber, a light splitter, a light beam combiner, an optical isolator, an optical fiber to be tested, a detecting device and the like;
the detection light is used for measuring the loss of the optical fiber to be measured at high temperature, the detection light comprises a detection light source and a tail fiber, the light source can be one wavelength or a plurality of wavelengths or even a super-continuum spectrum, and the tail fiber is a single-mode or multi-mode optical fiber generally and is used for transmitting the detection light;
the pumping light is used for ion energy level transition or other of the optical fiber to be detected, the pumping light comprises a pumping light source and a tail fiber, the pumping light source can be a semiconductor laser, an optical fiber laser or other, and the tail fiber is a single-mode or multi-mode optical fiber generally and is used for transmission of the pumping light;
the connecting optical fiber is used for connecting a test system, the diameter of a core cladding, the numerical aperture, the diameter of a mode field, the cut-off wavelength and the like of the connecting optical fiber are matched with the test system, the loss of the connecting optical fiber is as small as possible, and the connecting optical fiber is in fusion connection with each part;
the optical splitter is mainly used for splitting the detection light or the pumping light into two beams, the light intensity is usually 1% and 99%, wherein 1% of the light intensity is used for monitoring the performance of the detection light or the pumping light such as power, spectrum and the like in the measurement process, 99% of the light intensity is used for measuring the optical fiber to be measured, and the optical splitter is connected with the detection light or the pumping light through a connecting optical fiber;
the optical beam combiner is used for coupling the probe light or the pump light to a subsequent connecting optical fiber;
the optical isolator is used for protecting the detection light source or the pumping light source, only allows the detection light or the pumping light to be transmitted to the direction of the optical fiber to be detected, and isolates the possible light from the optical fiber to be detected to the detection light or the pumping light;
the optical fiber to be tested is the optical fiber which needs to measure the performance of one or more optical fibers at high temperature, and is placed in a high-temperature furnace system, the coating layer of the optical fiber to be tested needs to be peeled off firstly and then tested at higher temperature (when the coating layer of the optical fiber exceeds the limit use temperature), the optical fiber to be tested is connected with the connecting optical fiber in a welding way, and one part of the connecting optical fiber and the welding points of the connecting optical fiber can be positioned in the high-temperature furnace system or positioned outside the high-temperature furnace system;
the detection device is used for detecting the optical signal passing through the optical fiber to be detected, and can be an optical power meter, a spectrometer, an optical mode analyzer and the like.
The high-temperature furnace system comprises a heat-insulating cavity, heated gas, a heated gas inlet, a heated gas outlet, a gas fan, a temperature detector, a gas pipeline, a pipeline switch, a gas heating device, a gas cooling device, a gas pump, an optical fiber objective table, an optical fiber inlet to be detected, an optical fiber outlet to be detected and the like;
the heat-insulating cavity is used for creating a cavity with stable and uniform temperature for the optical fiber to be measured, so that the optical fiber can be measured at a required specific temperature, the inner cavity of the heat-insulating cavity needs to be a sealed environment, the use process is required to be clean, free of dust and free of moisture, the materials are usually high-purity quartz glass, aluminum oxide, stainless steel and the like, and the heat-insulating material needs to meet the characteristic of energy conservation;
the heated gas is filled in the whole heat preservation cavity during testing, the heat preservation cavity is rapidly heated to a certain high temperature by heating the gas, or the heat preservation cavity is rapidly cooled to a certain temperature by cooling the gas, the gas is high-purity dry gas, and can be nitrogen, oxygen, helium and the like, and high-purity nitrogen is preferably used;
the heating gas inlet is a part for connecting the gas inlet and the heat-preservation cavity, and the inlet part needs heat-preservation treatment;
the heating gas outlet refers to a part connected with the gas outlet of the heat preservation cavity, and the outlet part needs heat preservation treatment;
the gas fan is used for internal circulation of gas in the heat preservation cavity and aims to balance the temperature in the heat preservation cavity;
the temperature detector is used for measuring the temperature in the heat preservation cavity, the temperature detector, the gas pump, the heating device and the cooling device form feedback control, the temperature in the heat preservation cavity reaches a certain set value through heating, cooling and circulation of gas, and the temperature detector can be a thermistor, a thermocouple, an infrared thermometer and the like;
the gas pipeline is used for gas transportation, and generally adopts a double-layer pipeline (the inside is vacuumized) or a single-layer pipeline for heat preservation treatment on the outside;
the pipeline switch is used for controlling gas to enter the heating device or the cooling device, and the switch can be manually or automatically controlled;
the gas heating device is used for heating gas flowing through;
the gas cooling device is used for cooling gas, a water cooling machine is generally selected, and other cooling modes are adopted in special situations;
the gas pump is used for circulation of gas in and out, the gas pump needs to be subjected to heat preservation treatment, and the contact part of the gas pump and the gas is required to be sealed at a use temperature and free of dust and the like;
the optical fiber objective table is used for fixing an optical fiber to be measured, and the optical fiber objective table is positioned in a high-temperature area, so that the optical fiber objective table needs to meet the conditions that the deformation, the denaturation and the like are as small as possible, which may cause errors or errors in optical fiber measurement, and in addition, for measurement at higher temperature (the condition that an optical fiber coating layer is stripped), as the bare optical fiber needs to be laid on the objective table, the refractive index of the objective table has special requirements, and a corresponding refractive index material is generally selected according to the actual condition;
the inlet of the optical fiber to be tested is an inlet of the optical fiber on the high-temperature furnace system, and the temperature of the optical fiber inside and outside the cavity is different due to the need of ensuring the sealing of the cavity, the inlet is cylindrical, the part in contact with the heat-preservation cavity is sealed by O-ring, and the other part is subjected to water cooling treatment (the O-ring also needs water cooling), so that the temperature of the connecting optical fiber is maintained at room temperature;
the outlet of the optical fiber to be tested is an outlet of the optical fiber on the high-temperature furnace system, and as the sealing of the cavity needs to be ensured, and the temperatures of the optical fiber inside and outside the cavity are different, the outlet is cylindrical in structure, the part in contact with the heat-preservation cavity is sealed by O-ring, and the other parts are subjected to water cooling treatment (the O-ring also needs water cooling), so that the temperature of the connected optical fiber is maintained at room temperature;
the temperature detector, the gas pump, the heating device and the cooling device form feedback control, PID control is adopted for temperature control, when the temperature of the heat preservation cavity is lower than a design value, the gas pump is adjusted to a certain rotating speed, the gas flows through the heating device, the heating part of the heating device keeps constant temperature (target temperature), the gas returns to the cavity to heat the cavity, when the temperature detector detects that the temperature reaches the target temperature, the system maintains constant temperature, when the temperature of the heat preservation cavity is higher than the design value (or when the cavity needs to be cooled), the gas flows through the cooling device, the gas returns to the cavity to cool the cavity, and when the temperature detector detects that the temperature is reduced to the target temperature, the system maintains constant temperature.
To achieve the above object, according to another aspect of the present invention, there is provided a method of measuring the performance of an optical fiber at high temperature. The specific method comprises the following steps:
1. firstly, according to the optical path system, probe light (or pump light), a beam splitter, a beam combiner, an optical isolator, a connecting optical fiber and the like are connected in sequence;
2. ensuring that a high-temperature furnace system is in an initial state (namely, a heating gas, a heating device, a temperature measuring and controlling system, a cooling device, an air pump and the like are in a standby state), then opening a heat preservation cavity door to place the processed optical fiber to be detected on an optical fiber objective table, inserting a connecting optical fiber into an optical fiber inlet and outlet to be welded and connected with the optical fiber to be detected, processing a welding point, sealing the optical fiber inlet and outlet, and cooling the inlet and outlet by water cooling;
3. after the optical fiber to be tested is placed in the heat-insulating cavity, closing a door of the heat-insulating cavity, starting to introduce nitrogen into the cavity, enabling the humidity and the cleanliness in the cavity to meet the testing requirements (which can be measured by a hygrometer and a cleanliness meter), and finally completely sealing the cavity;
4. setting the temperature, the temperature rate and the like of a temperature control system according to a temperature curve required by the optical fiber to be measured, so that the temperature in the cavity reaches the specified temperature within the specified time;
5. the detection light (or pump light) and the detection device are controlled to test the optical fiber to be tested in the period of temperature rise, temperature drop or constant temperature according to the experiment requirement.
The invention has the following beneficial effects:
1. the device can actively research the change of the optical performance of the optical fiber when the internal temperature of the optical fiber core reaches a certain value or undergoes a certain temperature change through flexible temperature control, can directly research the relation between different temperatures and the optical performance, avoids the complex influence between the heat effect and the optical effect when a high-power pump is used, and also avoids the insecurity caused by high power;
2. the testing system can be stable by adopting the design of the all-fiber light path, the performance of the optical fiber to be tested can be better researched by only carrying out high-temperature treatment on the optical fiber to be tested and keeping other optical devices at normal temperature, and the interference of a light source can be eliminated by carrying out comparison research on the light splitting monitoring of the probe light (or the pump light).
Drawings
FIG. 1 is a schematic diagram of the present invention for measuring the performance of an optical fiber at high temperatures;
FIG. 2 is a diagram of a high temperature furnace apparatus for heating or cooling an optical fiber to be tested according to the present invention;
FIG. 3 is a graph of the emission spectra of ytterbium-doped fibers measured at different temperatures in an embodiment of the present invention;
the same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
1-detecting light 2-pumping light 3-optical splitter 4-beam combiner 5-optical isolator 6-high temperature furnace system 7-optical fiber to be detected 8-detecting device 9-connecting optical fiber 10-optical fiber inlet 11-heat preservation cavity inner cavity 12-heated gas inlet 13-gas fan 14-thermodetector 15-gas pipeline 16-optical fiber outlet 17-connecting optical fiber 18-heating device 19-pipeline switch 20-cooling device 21-optical fiber stage 22-optical fiber to be detected 23-heated gas outlet 24-gas pipeline 25-gas pump 26-pipeline switch.
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.
The emission spectrum measurement of ytterbium doped fiber at high temperature includes 915nm semiconductor laser pump with tail fiber comprising 105/125 large core fiber, 1% and 99% light splitter, optical isolator, 20/130 double-clad ytterbium doped fiber, high temperature furnace system and spectrometer; as shown in fig. 1, a tail fiber of a pump semiconductor laser 2 is connected with a splitter 3, the tail fiber of the splitter 3 is connected with an optical isolator 5, 20/130 ytterbium-doped double-clad optical fiber 7 to be tested is subjected to coating removal treatment and is wiped clean by alcohol, a high-temperature furnace cavity is opened, the ytterbium-doped optical fiber 7 is placed on an optical fiber objective table 21 (the ytterbium-doped optical fiber is required to be empty, namely, only in point contact with the objective table), a connecting optical fiber 9 is inserted into an optical fiber inlet 10, a connecting optical fiber 17 is inserted into an optical fiber outlet 16, then fusion-splicing connection is sequentially carried out with the optical fiber 7 to be tested, fusion-splicing junctions at two positions are positioned in the cavity, cooling treatment is started at the sealing optical fiber inlet 10 and the optical fiber outlet 16, high-purity nitrogen is injected into an inner cavity 11 through a high-temperature cavity 12 when the humidity and cleanliness in the heat-preserving cavity 11 meet experimental requirements, the inner cavity 11 is completely sealed, a gas pump 25 is started, a gas circuit switch 19, a gas circuit switch is started, 26, starting the heating device 18, starting the gas fan 13, setting the target temperature and the heating rate in the heat-insulating cavity, and starting the emission spectrum measurement of the ytterbium-doped optical fiber when the temperature reaches the target temperature.
In this embodiment, the emission spectrum of the ytterbium-doped double-clad fiber 7 is first tested 20/130 at room temperature and data is recorded; increasing the temperature in the heat-preservation cavity to 50 ℃ in 10 minutes, preserving the heat for 10 minutes, testing 20/130 the emission spectrum of the ytterbium-doped double-clad optical fiber 7, and recording data; the temperature in the heat-preservation cavity is raised to 100 ℃ for 10 minutes, the heat preservation is carried out for 10 minutes, and then the emission spectrum of the ytterbium-doped double-clad optical fiber 7 is tested 20/130 and the data is recorded. The optical power of the ytterbium-doped double-clad fiber measured by the optical splitter (the light intensity accounts for 1%) is measured at the same time in each measurement, the pump light intensity meets the saturated absorption of the ytterbium-doped fiber used in the experiment, and the emission spectrum of the ytterbium-doped double-clad fiber measured after normalization is shown in fig. 3.
It can be seen from fig. 3 that the emission spectrum shape of the ytterbium-doped fiber changes with the temperature rise, the peak intensity decreases, and the peak intensity wavelength tends to move toward the long wavelength direction, and since the fiber temperature in the use process of the ytterbium-doped fiber laser cannot be room temperature, the measurement of the emission spectrum at different temperatures has great guiding significance for the use temperature of the ytterbium-doped fiber and the design of the fiber.
In addition, the photodarkening of the rare earth-doped optical fiber is considered to be the formation of color centers in the optical fiber caused by the multi-photon absorption process of the optical fiber, the color center defects can increase the additional loss of the optical fiber in ultraviolet, visible light and near infrared light wave bands, and the heat treatment can cause the phenomenon of 'bleaching' of the darkened optical fiber, so that the optical loss of the optical fiber at different temperatures or the loss change of the optical fiber returning to the room temperature after the treatment at different temperatures can be detected by the device and the method, and the influence of the temperature on the photodarkening is researched;
in addition, the mode instability of the large-mode-field ytterbium-doped optical fiber under high power is considered to be that the heat inside the fiber core of the optical fiber can cause the change of the refractive index after the optical fiber exceeds a certain threshold power, however, the process has the combined action of high-power laser and the heat of the fiber core, the process is extremely complex, and in order to research the influence of the thermally induced refractive index change of the fiber core on the mode instability, the optical fiber is firstly heated to a certain temperature and is kept for a certain time, then the environment of the glass cladding of the optical fiber is quickly reduced to a certain temperature to simulate the distribution of the temperature in the optical fiber under the high-power condition, and then the mode of the output laser is researched by generating low-power laser in the optical fiber to be tested, so that the influence of the temperature on the mode can be obtained.
It will be understood by those skilled in the art that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (8)
1. The device for measuring the performance of the optical fiber at high temperature is characterized by comprising a set of all-optical fiber testing system and a set of high-temperature furnace system;
the all-fiber testing system comprises detection light or pump light, a connecting fiber, a light splitter, a light combiner, an optical isolator, a fiber to be tested and a detecting device;
the detection light is used for measuring the loss of the optical fiber to be measured at high temperature, the detection light comprises a detection light source and a tail fiber, the light source is a wavelength, a plurality of wavelengths or a super-continuum spectrum, and the tail fiber is a single-mode or multi-mode optical fiber and is used for transmitting the detection light;
the pumping light is used for measuring the ion energy level transition of the optical fiber to be measured, the pumping light comprises a pumping light source and a tail fiber, the pumping light source is a semiconductor laser, an optical fiber laser or the like, and the tail fiber is a single-mode or multi-mode optical fiber and is used for transmitting the pumping light;
the high-temperature furnace system comprises a heat-preservation cavity, heated gas, a heated gas inlet, a heated gas outlet, a gas fan, a temperature detector, a gas pipeline, a pipeline switch, a heating device, a cooling device, a gas pump, an optical fiber objective table, an optical fiber inlet to be detected and an optical fiber outlet to be detected;
the heat-insulating cavity is used for creating a stable and uniform temperature cavity for the optical fiber to be measured, so that the optical fiber can be measured at a required specific temperature, the inner cavity of the heat-insulating cavity is a sealed environment, and the optical fiber is clean, dust-free and moisture-free in the using process and is made of high-purity quartz glass, aluminum oxide or stainless steel;
the heating gas is filled in the whole heat preservation cavity during testing, and the heat preservation cavity rapidly reaches a certain high temperature by heating the heating gas or rapidly lowers the temperature to a certain temperature by cooling the heating gas;
the heating gas inlet and the heating gas outlet are subjected to heat preservation treatment, and the gas fan is used for internal circulation of gas in the heat preservation cavity to balance the temperature in the heat preservation cavity;
the temperature detector is used for measuring the temperature in the heat preservation cavity, and forms feedback control with the gas pump, the heating device and the cooling device, and the temperature in the heat preservation cavity reaches a certain set value through heating, cooling and circulation of gas;
the optical fiber objective table is used for fixing an optical fiber to be detected, the structure of the inlet of the optical fiber to be detected is cylindrical, the part of the optical fiber to be detected, which is in contact with the heat preservation cavity, is sealed by O-ring, the other part of the optical fiber is subjected to water cooling treatment, so that the temperature of the connecting optical fiber is maintained at room temperature, the structure of the outlet of the optical fiber to be detected is cylindrical, the part of the optical fiber to be detected, which is in contact with the heat preservation cavity, is sealed by O-ring, and the other part of the optical fiber is subjected to water cooling treatment, so that the temperature of the connecting optical fiber is maintained at room temperature;
in the feedback control formed by the temperature detector, the gas pump, the heating device and the cooling device, the PID control is adopted for temperature control, when the temperature of the heat preservation cavity is lower than a design value, the gas pump is adjusted to a first rotating speed, the gas flows through the heating device, the heating part of the heating device keeps a target temperature, the gas returns to the cavity to heat the cavity, when the temperature detector detects that the temperature reaches the target temperature, the system maintains the constant temperature, when the temperature of the heat preservation cavity is higher than the design value, the gas pump is adjusted to a second rotating speed, the gas flows through the cooling device and returns to the cavity to cool the cavity, and when the temperature detector detects that the temperature is reduced to the target temperature, the system maintains the constant temperature.
2. The apparatus of claim 1, wherein the core cladding diameter, numerical aperture, mode field diameter, and cutoff wavelength of the connecting fiber are matched with the test system, and the connecting fiber is fusion-spliced to each section.
3. The apparatus of claim 1, wherein the optical splitter is configured to split the probe light or the pump light into two beams, the light intensities are 1% and 99%, respectively, wherein 1% of the beams are used for monitoring the power and the spectral performance of the probe light or the pump light during the measurement, 99% of the beams are used for the measurement of the optical fiber to be measured, and the optical splitter is connected to the probe light or the pump light through a connecting fiber.
4. The apparatus according to claim 1, wherein the optical fiber to be tested is placed in a high temperature furnace system, when the measurement temperature exceeds the limit use temperature of the coating of the optical fiber, the coating of the optical fiber to be tested needs to be peeled off and then tested, the optical fiber to be tested is fusion-spliced with the connecting optical fiber, and the portions of the connecting optical fiber and their fusion-splicing points are located in the high temperature furnace system or located outside the high temperature furnace system.
5. The apparatus of claim 1, wherein the detection device is configured to detect an optical signal passing through the optical fiber under test, and the detection device is an optical power meter, a spectrometer or an optical mode analyzer.
6. The apparatus for measuring the performance of an optical fiber at high temperature according to claim 1, wherein the heating gas used is a high purity dry gas, which is nitrogen, oxygen or helium.
7. The apparatus of claim 1, wherein the gas pipe is used for gas transportation, and the outside of the pipe is insulated; the pipeline switch is used for controlling gas to enter the heating device or the cooling device, and the switch is manually or automatically controlled.
8. A method of measuring the performance of an optical fiber at high temperatures using the apparatus of any one of claims 1-7, comprising the steps of:
1. the device as claimed in claims 1-7, wherein the probe light or pump light, the beam splitter, the beam combiner, the optical isolator and the connecting optical fiber are connected in sequence;
2. ensuring that a high-temperature furnace system is in an initial state, namely heating gas, a heating device, a temperature measuring and controlling system, a cooling device and an air pump are in a standby state, then opening a heat preservation cavity door to place the processed optical fiber to be detected on an optical fiber objective table, inserting a connecting optical fiber into an optical fiber inlet and outlet to be welded and connected with the optical fiber to be detected, processing a welding point, sealing the optical fiber inlet and outlet, and cooling the inlet and outlet by water cooling;
3. after the optical fiber to be tested is placed in the heat-insulating cavity, closing a door of the heat-insulating cavity, starting to introduce nitrogen into the cavity, enabling the humidity and the cleanliness in the cavity to meet the testing requirements, and finally completely sealing the cavity;
4. setting the temperature and the temperature rate of a temperature control system according to a temperature curve required by the optical fiber to be measured, so that the temperature in the cavity reaches the specified temperature within the specified time;
5. and controlling the probe light or the pump light in the period of heating, cooling or constant temperature according to the experiment requirement, and testing the optical fiber to be tested by the detection device.
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| CN106404353B (en) * | 2016-08-31 | 2018-10-30 | 长飞光纤光缆股份有限公司 | A kind of optical fiber testing system |
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| CN108931486B (en) * | 2018-05-23 | 2020-12-01 | 长飞光纤光缆股份有限公司 | Fiber core absorption coefficient testing system and method of ytterbium-doped optical fiber |
| CN110779682A (en) * | 2019-09-25 | 2020-02-11 | 江苏法尔胜光通信科技有限公司 | Ytterbium-doped active optical fiber all-fiber laser test system suitable for high power and test method thereof |
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