La掺杂对用于空间激光通信的掺铒光纤辐射损伤效应的影响
Effect of La Doping on the Radiation Damage Effect of Er~(3+)-Doped Silica Fibers for Space Laser Communication
查看参考文献16篇
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文摘
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为验证La掺杂对于掺铒光纤抗辐照性能的影响,采用La掺杂光纤与无La掺杂光纤进行光纤辐照实验。使用60Co辐照源在常温下对光纤进行累积剂量100 krad,剂量率6.17 rad/s的辐照实验。结果发现,La掺杂光纤在1 200 nm处损耗为0.030 67 dB(km·krad),相比于无La掺杂光纤0.039 53 dB (km·krad)更低,且La掺杂光纤在辐照环境下的增益变化更小。通过光纤吸收谱和EPR谱辐照前后的对比,确定了Al-OHC缺陷为影响光纤辐致损耗的关键因素。La掺杂可以在一定程度上代替Al作为Er离子的分散剂从而增强光纤的抗辐照能力,且La掺杂对光纤的增益性能不会产生负面影响。该研究可为后续特种光纤在空间应用中的抗辐射加固设计提供参考。 |
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其他语种文摘
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Space laser communication has the outstanding advantages of large transmission bandwidth, high transmission rate, and strong anti-interference ability, which is an important development direction of future communication technology. Since relay amplification cannot be realized in space laser communication links, a large transmission optical power is required in addition to ensuring a high modulation rate. Erbiumdoped fiber amplifier achieves the amplification of 1.55 μm optical signal through the three-layer structure of erbium ions. The erbium-doped fiber is the core component of the erbium-doped fiber amplifier, and the erbium-doped fiber is a silicon fiber doped with a small number of erbium ions. In the space irradiation environment, high-energy particles impact the erbium-doped fiber, the core component of the erbiumdoped fiber amplifier, resulting in a large number of carriers in the fiber, which combines with the original defects in the fiber to form new color-centered defects. The core defect leads to a dramatic increase in the loss of the fiber in the operating band, as well as a decrease in the gain performance of the erbium-doped fiber. As a rare earth element, La, like Er, is present in the interstitial positions of the quartz lattice structure. It can compete with Er ions for the interstitial positions and act as a dispersion of Er ions. It can achieve Al without affecting the maximum amount of Er ion doping. Low dose doping. La doping can disperse Er ions and suppress fluorescence quenching. There are few studies on the radiation effects of lanthanum-doped erbium-doped fibers. It is important to further understand the radiation-induced absorption mechanism of erbium-doped fibers to improve the performance of erbium-doped fibers in harsh environments. To verify the effect of La doping on the radiation resistance of erbium-doped fibers, two types of erbium-doped fibers, lanthanum-doped and non-lanthanum-doped, are selected in this paper, and the macroscopic radiation gain resistance performance and microstructural changes of the fibers are investigated. Radiation damage test study. The optical fiber was irradiated with a 60Co irradiation source at room temperature at a cumulative dose of 100 krad and a dose rate of 6.17 rad/s. The loss of the fiber was found to decrease along the wavelength direction in the range of 843~1 659 nm by electron probe tests and loss spectroscopy tests before and after irradiation, as well as online loss tests at specific wavelength points. However, the five fixed wavelength tests are not sufficient to fully express the loss variation of the fiber in each wavelength band under an irradiation environment. Offline loss tests were performed on both fibers before and after irradiation. The results showed that the increment before and after irradiation was 3 019 dB/km for S1 and 3 922 dB/km for S2. The loss increment of S2 after irradiation was significantly larger than that of S1 after irradiation. it was speculated that Al-OHC mainly caused the radiation-induced absorption. Absorption spectroscopy tests showed that La doping did not cause any change in the performance of Er ions in the fiber. the loss of the La-doped fiber at 1 200 nm was 0.030 67 dB/(km·krad), which was lower than 0.039 53 dB/(km·krad), and the gain of the La-doped fiber changed very little in the irradiated environment. The properties of the core matrix material did not change after irradiation by Raman testing, which proves that La doping does not cause changes in the glass lattice structure of the fiber. The paramagnetic defects of the fibers were further tested by electron paramagnetic resonance spectroscopy. The EPR signal intensities of the color-centered defects corresponding to Ge and Si did not differ much between the two types of light at 3 370 Gauss by fiber absorption spectroscopy and EPR tests. |
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来源
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光子学报
,2023,52(2):0206003 【核心库】
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DOI
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10.3788/gzxb20235202.0206003
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关键词
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激光通信
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掺铒光纤
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辐射效应
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γ 辐照
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镧掺杂
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地址
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1.
兰州空间技术物理研究所, 空间环境材料行为及评价技术国防科技重点实验室, 兰州, 730000
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中国科学院西安光学精密机械研究所, 瞬态光学与光子技术国家重点实验室, 西安, 710119
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中国科学院大学材料与光电研究中心, 北京, 100049
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1004-4213 |
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学科
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电子技术、通信技术 |
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基金
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国防科技重点实验室基金
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航天科技集团自主研发项目
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文献收藏号
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CSCD:7426415
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