Radiation resistant trishell erbium-ytterbium co-doped optical fiber based on secondary carrier gas and preparation method thereof

Abstract

The application discloses a kind of irradiation-resistant three-clad erbium-ytterbium co-doped optical fiber based on secondary carrier gas and preparation method thereof, comprising the following steps: S1. obtaining optical fiber preform, the optical fiber preform is doped with erbium ion, ytterbium ion and cerium ion;S2. in the optical fiber preform, mixed gas containing deuterium is introduced to carry out primary carrier gas, and then irradiation treatment and heat bleaching treatment are carried out in sequence to obtain post-processing optical fiber preform;S3. the post-processing optical fiber preform is made into three-clad optical fiber using tube-bar drawing process;S4. in the three-clad optical fiber, mixed gas containing deuterium is introduced to carry out secondary carrier gas, and the irradiation-resistant three-clad erbium-ytterbium co-doped optical fiber is obtained;The scheme improves the anti-radiation performance of three-clad optical fiber through twice carrier gas treatment, and the optical performance is not affected.

Description

Technical Field

[0001] This invention relates to the field of erbium-ytterbium co-doped optical fiber technology, and in particular to a radiation-resistant triple-cladding erbium-ytterbium co-doped optical fiber based on a secondary carrier gas and its preparation method. Background Technology

[0002] Optical fiber has advantages such as high transmission efficiency, low loss, light weight, and resistance to electrostatic interference, and has been widely used in the field of communications. Rare-earth (such as Yb, Er, Tm) doped silica fiber lasers or amplifiers have advantages such as light weight, small size, high electro-optical conversion efficiency, high peak power, and narrow linewidth, and have important application value in space communications, lidar, space debris management, and airborne laser weapons.

[0003] However, lasers or amplifiers performing space missions will face severe particle radiation (such as protons, electrons, X-rays, and gamma rays). Particle radiation can cause a sharp increase in the loss of active optical fibers within the laser or amplifier, a significant decrease in laser slope efficiency, and in severe cases, even a complete lack of laser output. A commonly used technique is to enhance the radiation resistance of optical fibers by compounding different radiation-resistant ions.

[0004] However, the efficiency of erbium-ytterbium radiation-resistant optical fibers is generally required to be around 35%. If the radiation resistance of the fiber is improved by optimizing the composition under this requirement, it can only be achieved by sacrificing some optical performance. Therefore, there is an urgent need for a method to balance the optical performance and radiation resistance of optical fibers. Summary of the Invention

[0005] In view of this, this application provides a radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber based on a secondary carrier gas and its preparation method, which solves the problem of how to balance the radiation resistance and optical performance of triple-clad erbium-ytterbium co-doped optical fiber.

[0006] To achieve the above technical objectives, this application adopts the following technical solution:

[0007] In a first aspect, this application provides a method for preparing radiation-resistant triple-clad erbium-ytterbium co-doped optical fibers based on a secondary carrier gas, comprising the following steps:

[0008] S1. Obtain an optical fiber preform, which is doped with erbium ions, ytterbium ions and cerium ions;

[0009] S2. A mixed gas containing deuterium is introduced into the optical fiber preform as a carrier gas, followed by irradiation treatment and thermal bleaching treatment to obtain a post-treated optical fiber preform.

[0010] S3. Use the tube-rod drawing process to fabricate post-processed optical fiber preforms into triple-clad optical fibers;

[0011] S4. A mixed gas containing deuterium is introduced into the triple-clad optical fiber as a secondary carrier gas to obtain radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber.

[0012] Preferably, in step S2, the carrier gas pressure is 2.1-2.5 MPa, the carrier gas temperature is 100-200℃, and the carrier gas time is 0.5-5 h.

[0013] Preferably, in step S4, the secondary carrier gas pressure is 0.5-1.6 MPa, the carrier gas temperature is 20-80°C, and the carrier gas time is 8-10 h.

[0014] Preferably, in step S2, the proportion of deuterium in the mixed gas is 84.6-100%; in step S4, the proportion of deuterium in the mixed gas is 30-75%.

[0015] Preferably, in step S2, the irradiation dose is 50-5000 Gy and the irradiation rate is 10-200 Gy / h.

[0016] Preferably, in step S2, the temperature for thermal bleaching is 500-1200℃.

[0017] Preferably, the fabrication process of the optical fiber preform is as follows:

[0018] S11. A porous silica layer is deposited on the inner wall of a pure quartz tube using vapor deposition to obtain a reaction tube;

[0019] S12. Immerse the reaction tube in a doped solution containing erbium ions, ytterbium ions and cerium ions, and then dry it with nitrogen gas to obtain a doped quartz tube.

[0020] S13. At 500-1200℃, chlorine gas is introduced into the doped quartz tube, and then phosphorus oxychloride and oxygen are passed through at 1200-1400℃ to obtain the deposited quartz tube.

[0021] S14. At 1900-2200℃, oxygen and helium are introduced into the deposited quartz tube to vitrify it, and then the tube is collapsed using the collapse method to obtain the optical fiber preform.

[0022] Preferably, step S3 is as follows:

[0023] S31. Insert the post-processed optical fiber preform into the inner sleeve, then into the outer sleeve, and draw the fiber using the tube-rod method to obtain the drawn optical fiber; the inner sleeve is octagonal pure quartz, and the outer sleeve is fluorine-doped quartz.

[0024] S32. A low-refractive-index coating is applied to the outer wall of the drawn optical fiber to obtain a triple-clad optical fiber.

[0025] Secondly, this application provides a radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber.

[0026] Thirdly, this application provides an application of radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber under irradiation conditions of 1000 Gy or more.

[0027] The beneficial effects of this application are as follows: This application improves the radiation resistance of triple-clad erbium-ytterbium co-doped optical fibers by combining the processes of primary carrier gas, pre-irradiation, thermal bleaching and secondary carrier gas, while ensuring that the fiber efficiency does not decrease under the same conditions. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] Terminology Explanation

[0030] Thermal bleaching: The irradiated optical fiber preform is kept at 500-1200℃ for 1-2 hours.

[0031] Low refractive index coating: a coating with a refractive index below 1.38.

[0032] In a first aspect, this application provides a method for preparing radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber based on a secondary carrier gas, comprising the following four steps:

[0033] S1. Obtain an optical fiber preform, which is doped with erbium ions, ytterbium ions and cerium ions;

[0034] The specific process for the optical fiber preform in step S1 is as follows:

[0035] S11. First, a porous layer of silica is deposited on the inner wall of a pure quartz tube by vapor deposition to obtain a reaction tube;

[0036] S12. Introduce a doping solution into the reaction tube after the above treatment. The doping solution includes, but is not limited to, Er. 3+ (0.5~2g / L), Yb 3+ (0.05~5.0g / L), Ce 3+ (0.22~0.8g / L), the quartz tube is immersed in the doping solution at 20-60℃ for 2-10 hours, with the rotation speed of the quartz tube being 10-50 r / min during immersion. After the doping solution is removed from the quartz tube, the quartz tube is dried with nitrogen gas, with the nitrogen flow rate controlled at 15-30 m³ / min. 3 / min, to obtain a doped quartz tube; the porous structure inside the quartz tube in this step adsorbs ions in the doping solution, and the absorption of ions by the porous structure is further promoted under heating and rotation conditions.

[0037] S13. Chlorine gas is introduced into the doped quartz tube and heated at 500-1200℃ to remove moisture and hydroxyl groups from the tube; then phosphorus oxychloride and oxygen are introduced into the quartz tube after chlorine gas is introduced and the quartz tube is heated at 1200-1400℃, so that P is deposited into the quartz tube in the form of P2O5, and a deposited quartz tube is obtained.

[0038] S14. Oxygen and helium are introduced into the deposited quartz tube and vitrified at 1900-2200℃ to melt and vitrify the porous structure, so that the rare earth ions in the doping solution are transformed into a glass structure; then the above quartz tube is collapsed into a solid optical fiber preform doped with anti-radiation ions by the collapse method.

[0039] S2. A mixed gas containing deuterium is introduced into the optical fiber preform finally obtained in step S1 as a carrier gas, and then irradiation treatment and thermal bleaching treatment are performed in sequence to obtain a post-processed optical fiber preform.

[0040] In this step, the mixed gas includes deuterium and other gases, including but not limited to inert gases such as nitrogen, helium, and neon. The optical fiber preform is then irradiated and followed by thermal bleaching. The irradiation dose is 50-5000 Gy, and the irradiation rate is 10-200 Gy / h. The thermal bleaching temperature is 500-1200℃. High irradiation doses and rates will cause irreversible damage to the preform, while low irradiation rates will affect the treatment effect.

[0041] The specific steps for the carrier gas are as follows: the optical fiber preform is placed in a high-pressure tank, and a mixed gas containing deuterium is introduced for primary carrier gas. In step S2, the carrier gas pressure is 2.1-2.5 MPa, the carrier gas temperature is 100-200℃, and the carrier gas time is 0.5-5 h.

[0042] After the first carrier gas treatment, irradiation and thermal bleaching were also performed. The purpose of these treatments is as follows: firstly, pre-irradiation reduces the irradiation sensitivity of the optical fiber preform and improves its irradiation performance; secondly, irradiation will cause the preform to form a "color center," which is a defect. Thermal bleaching will repair the color center. The first carrier gas treatment before irradiation is to reduce the damage of the irradiation to the preform and reduce the formation of "color centers."

[0043] S3. Use the tube-rod drawing process to fabricate post-processed optical fiber preforms into triple-clad optical fibers;

[0044] The specific fabrication process of the triple-clad optical fiber in step S3 is as follows:

[0045] S31. Insert the post-processed optical fiber preform into the inner sleeve, then into the outer sleeve, and draw the fiber using the tube-rod method to obtain the drawn optical fiber; the inner sleeve is octagonal pure quartz, and the outer sleeve is fluorine-doped quartz; control the drawing speed to 100-200m / min, the tension to 10-150g, and the temperature to 1900℃-2100℃.

[0046] S32. A low-refractive-index coating is applied to the outer wall of the drawn optical fiber under a pressure of 1-100 Pa to obtain a triple-clad optical fiber.

[0047] The triple-clad optical fiber obtained in step S3 uses an optical fiber preform as the core. During the drawing process in step S31, the core size is controlled to be 9-12μm. The first cladding is an octagonal pure quartz layer, the second cladding is a fluorine-doped quartz layer, and the third layer is a low-refractive-index coating.

[0048] S4. A mixed gas containing deuterium is introduced into the triple-clad optical fiber as a secondary carrier gas to obtain radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber.

[0049] The specific steps for the carrier gas are as follows: placing the triple-clad optical fiber into a high-pressure tank and introducing a mixed gas containing deuterium as a secondary carrier gas. In step S4, the carrier gas pressure is 0.5-1.6 MPa, the carrier gas temperature is 20-80℃, and the carrier gas time is 8-10 h.

[0050] In this step, the mixed gas includes deuterium and other gases, including but not limited to inert gases such as nitrogen, helium, and neon.

[0051] This scheme improves the radiation resistance of triple-clad erbium-ytterbium co-doped optical fibers through two carrier gas processes. The mechanism is as follows: After obtaining the optical fiber preform doped with radiation-resistant ions, a first carrier gas process is performed. The purpose of the first carrier gas process is to eliminate material defects inside the quartz glass as a whole, suppress uneven stress distribution inside the optical fiber preform, reduce the attenuation of the post-processed preform to be drawn, and effectively reduce the radiation sensitivity of the optical fiber. After drawing, a triple-clad optical fiber is obtained, and a second carrier gas process is performed. The purpose of the second carrier gas process is to further improve the radiation resistance of the optical fiber without affecting its optical performance.

[0052] It is worth noting that the primary carrier gas conditions in step S2 are different from the secondary carrier gas conditions in step S4. Compared with the primary carrier gas, the secondary carrier gas has a lower temperature and a longer duration. This is because the secondary carrier gas is used for triple-clad optical fibers. If the temperature is too high, the coating of the triple-clad optical fiber will age and the fiber strength will be damaged. If the temperature is too low, the deuterium permeability will be poor. Increasing the duration of the secondary carrier gas helps to increase the permeability of the carrier gas, which ultimately further improves the radiation resistance of the triple-clad optical fiber.

[0053] In step S2, the proportion of deuterium in the mixed gas is 84.6-100%; in step S4, the proportion of deuterium in the mixed gas is 30-75%. Within this range, the deuterium permeation effect is good.

[0054] Secondly, this application provides a radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber. The triple-clad optical fiber has an optical fiber preform as its core, an octagonal pure quartz layer as the first cladding, a fluorine-doped quartz layer as the second cladding, and a low-refractive-index coating as the third layer.

[0055] Thirdly, this application provides an application of radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber under irradiation conditions of 1000 Gy or more.

[0056] The following specific examples provide further details.

[0057] Example 1

[0058] A method for fabricating radiation-resistant triple-clad erbium-ytterbium co-doped optical fibers based on a secondary carrier gas includes the following steps:

[0059] S1. Obtain optical fiber preforms, which are doped with erbium ions, ytterbium ions, and cerium ions:

[0060] S11. First, a porous layer of silica is deposited on the inner wall of a pure quartz tube by vapor deposition to obtain a reaction tube;

[0061] S12. Introduce a doping solution into the reaction tube after the above treatment. The doping solution includes, but is not limited to, Er. 3+ (0.45g / L), Yb 3+ (0.52g / L), Ce 3+ (0.22 g / L) The quartz tube was immersed in the doping solution at 25°C for 2.5 h, with the rotation speed of the quartz tube at 25 r / min during immersion. After the doping solution was removed from the quartz tube, the quartz tube was dried with nitrogen gas, with the nitrogen flow rate controlled at 15-30 m³ / min. 3 / min, to obtain a doped quartz tube;

[0062] S13. Chlorine gas is introduced into the doped quartz tube and heated at 1125°C to remove moisture and hydroxyl groups from the tube; phosphorus oxychloride and oxygen are introduced into the quartz tube after chlorine gas is introduced, and the quartz tube is heated to 1330°C at the same time to deposit phosphorus in the form of P2O5 into the quartz tube to obtain a deposited quartz tube.

[0063] S14. Oxygen and helium are introduced into the deposited quartz tube and vitrified at 1950℃; then the quartz tube is collapsed into a solid fiber preform doped with radiation-resistant ions using a collapse method.

[0064] S2. Place the optical fiber preform obtained in S1 into a high-pressure tank, introduce deuterium and helium gas, with deuterium accounting for 84.6% of the mixed gas, adjust the pressure inside the tank to 2.1 MPa, heat the tank to 110°C, and maintain the temperature and pressure for 7.5 hours. Then, take out the optical fiber preform and pre-irradiate it with a total radiation dose of 1000 Gy. After that, keep the irradiated preform at 1000°C for heat bleaching treatment to obtain the post-processed optical fiber preform.

[0065] S3. Using a tube-rod drawing process, post-processed optical fiber preforms are fabricated into triple-clad optical fibers:

[0066] S31. Insert the post-processed optical fiber preform into a sleeve with an inner octagonal pure quartz layer and an outer fluorine-doped quartz layer, and draw the fiber using the tube-rod method, controlling the drawing speed at 110m / min, the tension at 100g, and the temperature at 1900℃.

[0067] S32. A low-refractive-index coating is applied to the outer wall of the drawn optical fiber at a pressure of 45 Pa. The core size is controlled to be 9 μm, the distance between opposite sides of the octagonal inner cladding is 105 μm, and the outer cladding size is 125 μm. The fiber is then drawn into a triple-clad optical fiber.

[0068] S4. Place the triple-clad optical fiber into a high-pressure tank, introduce deuterium and helium gas, with deuterium accounting for 75% of the mixed gas. Adjust the pressure inside the tank to 1.6 MPa, heat the tank to 65°C, and maintain the temperature and pressure for 8.5 hours to obtain radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber.

[0069] The measured slope efficiency was 36.75%, and the absorption coefficient at 1530 nm was 41.27 dB / m. After the optical fiber was irradiated with a total dose of 1000 Gy, the absorption coefficient at 1530 nm was measured to be 39.07 dB / m, and the radiation-induced absorption change (RIA) was calculated to be 0.022 dB / m / kRad.

[0070] Example 2

[0071] A radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber, otherwise identical to Example 1, except that Ce... 3+ The concentration is 0.5 g / L.

[0072] Example 3

[0073] A radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber, otherwise identical to Example 1, except that Ce... 3+ The concentration was 0.8 g / L.

[0074] Example 4

[0075] A radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber is described, with other contents being the same as in Example 1. The difference is that the deuterium concentration, tank pressure, temperature, and time of the secondary carrier gas in the triple-clad optical fiber in step S4 are the same as the conditions of the primary carrier gas of the optical fiber preform in step S2.

[0076] Comparative Example 1

[0077] An irradiation-resistant triple-clad erbium-ytterbium co-doped optical fiber is described, with other contents being the same as in Example 1. The difference is that the secondary carrier gas in step S4 is not included, and step S2 does not involve irradiation and bleaching treatment after the primary carrier gas.

[0078] Comparative Example 2

[0079] A radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber is provided, which is otherwise the same as in Example 1, except that the secondary carrier gas in step S4 is not included, and the bleaching treatment is not performed after the primary carrier gas in step S2.

[0080] Comparative Example 3

[0081] A radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber is described, with the same contents as in Example 1, except that the secondary carrier gas in step S4 is not included.

[0082] Comparative Example 4

[0083] A radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber is described, with other contents being the same as in Example 1, except that step S2 does not involve irradiation and bleaching after the first carrier gas treatment.

[0084] Comparative Example 5

[0085] A radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber is provided, which is otherwise the same as in Example 1, except that it does not include the secondary carrier gas in step S4, nor does it include the primary carrier gas in step S2, nor the irradiation and bleaching process.

[0086] Comparative Example 6

[0087] A radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber is described, which is otherwise the same as in Example 1, except that the carrier gas treatment in step S2 is not included.

[0088] Testing and Evaluation

[0089] The slope and radiation-induced absorption variation (RIA) values ​​of the radiation-resistant triple-clad erbium-ytterbium co-doped optical fibers obtained in the examples and comparative examples were tested.

[0090] Efficiency is the ratio of pump power to fiber power, reflecting the optical performance of the fiber. It is tested using the truncation method, and points are plotted on the pump power (X) and fiber power (Y) coordinate axes. Linear fitting is performed, and the slope of the fitted line equation is the slope efficiency. The higher the slope efficiency, the better the optical performance.

[0091] RIA = |Absorption before fiber irradiation - Absorption after fiber irradiation| ÷ Irradiation dose; where the absorption value is the absorption coefficient at 1530nm directly read by the testing equipment, and the irradiation dose is 1000Gy (10Gy = 1krad). The lower the RIA value, the better the radiation resistance.

[0092] The test results are shown in Table 1.

[0093] Table 1 Results of Radiation Resistance Test

[0094]

[0095] The test results show that in Examples 1-3, with Ce... 3+ With increasing Ce content, the RIA (Rapid Intensity Aperture) of optical fibers tends to decrease, indicating that Ce... 3+ The higher the concentration of Ce, the better the irradiation performance of the optical fiber. However, with the increase of Ce... 3+ As the concentration of [agent] increases, the slope efficiency of the optical fiber decreases sharply, and its optical performance weakens.

[0096] Compared to Example 4, Example 1 has a higher RIA value than Example 4. Example 4 shows a slight improvement in radiation resistance. This is because the secondary carrier gas conditions in step S4, which increase the deuterium ratio, increase the pressure inside the container, and increase the temperature, allow more deuterium to be loaded into the optical fiber, thus improving its radiation resistance. However, Example 1 has a higher slope efficiency than Example 4, and Example 4 shows a significant decrease in optical performance. This indicates that high temperatures can degrade the optical performance of optical fibers. Using a low-temperature, long-duration secondary carrier gas method is more beneficial for simultaneously ensuring both radiation resistance and optical performance.

[0097] Comparative Example 5 does not include the processes of primary carrier gas, secondary carrier gas, irradiation, and bleaching. Compared with Comparative Example 1, the RIA was reduced by 0.01, and compared with Comparative Example 6, it was reduced by 0.11. The sum of the RIA reduction values ​​of Comparative Example 1 and Comparative Example 2 is lower than the difference between Comparative Example 5 and Example 1, indicating that there is a synergistic effect between primary carrier gas and irradiation, bleaching, and secondary carrier gas to improve radiation resistance. In addition, the combined process (Example 1) has a smaller impact on optical fiber efficiency.

[0098] Compared to Comparative Example 2, Comparative Example 1 has a higher RIA value and slope efficiency, indicating that irradiation treatment can improve radiation resistance but reduces optical performance. Comparative Example 2, compared to Example 1, does not include the bleaching process, but its RIA value is increased and slope efficiency is decreased, indicating that thermal bleaching treatment can further reduce the radiation sensitivity of the optical fiber, thereby enhancing its radiation performance. Furthermore, the degradation of slope efficiency caused by carrier gas and irradiation after thermal bleaching treatment is significantly repaired.

[0099] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber based on a secondary carrier gas, characterized in that, Includes the following steps: S1. Obtain an optical fiber preform, wherein the optical fiber preform is doped with erbium ions, ytterbium ions and cerium ions; S2. A mixed gas containing deuterium is introduced into the optical fiber preform as a carrier gas, and then irradiation treatment and thermal bleaching treatment are performed in sequence to obtain a post-treated optical fiber preform. S3. The post-processed optical fiber preform is fabricated into a triple-clad optical fiber using a tube-rod drawing process; S4. A mixed gas containing deuterium is introduced into the triple-clad optical fiber as a secondary carrier gas to obtain the radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber. The process of step S3 is as follows: S31. Insert the post-processed optical fiber preform into the inner sleeve, then into the outer sleeve, and draw the fiber using the tube-rod method to obtain the drawn optical fiber; the inner sleeve is octagonal pure quartz, and the outer sleeve is fluorine-doped quartz. S32. A low-refractive-index coating is applied to the outer wall of the drawn optical fiber to obtain the triple-clad optical fiber; In step S2, the carrier gas pressure is 2.1-2.5 MPa, the carrier gas temperature is 100-200℃, and the carrier gas time is 0.5-5 h. In step S4, the secondary carrier gas pressure is 0.5-1.6 MPa, the carrier gas temperature is 20-80℃, and the carrier gas time is 8-10 h.

2. The method for preparing radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber based on a secondary carrier gas according to claim 1, characterized in that, In step S2, the proportion of deuterium in the mixed gas is ≥84.6%, and the proportion of deuterium in the mixed gas is <100%; in step S4, the proportion of deuterium in the mixed gas is 30-75%.

3. The method for preparing radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber based on a secondary carrier gas according to claim 1, characterized in that, In step S2, the irradiation dose is 50-5000 Gy and the irradiation rate is 10-200 Gy / h.

4. The method for preparing radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber based on a secondary carrier gas according to claim 1, characterized in that, In step S2, the temperature for heat bleaching is 500-1200℃.

5. The method for preparing radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber based on a secondary carrier gas according to claim 1, characterized in that, In step S1, the fabrication process of the optical fiber preform is as follows: S11. A porous silica layer is deposited on the inner wall of a pure quartz tube using vapor deposition to obtain a reaction tube; S12. The reaction tube is immersed in a doping solution containing erbium ions, ytterbium ions and cerium ions, and then dried with nitrogen gas to obtain a doped quartz tube. S13. Chlorine gas is introduced into the doped quartz tube at 500-1200℃, and then phosphorus oxychloride and oxygen are passed through it at 1200-1400℃ to obtain the deposited quartz tube. S14. At 1900-2200℃, oxygen and helium are introduced into the deposited quartz tube to vitrify it, and then the tube is collapsed using the collapse method to obtain the optical fiber preform.

6. A radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber obtained by the preparation method according to any one of claims 1-5.

7. The application of the radiation-resistant triple-clad erbium-ytterbium co-doped optical fiber as described in claim 6 under irradiation conditions of 1000 Gy or more.

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