Study on broadband high gain integrated amplifiers and circuits using Er doped garnet crystal thin-film

掺铒石榴石晶体薄膜宽带高增益集成放大器及电路研究

• 批准号: 11555101
• 负责人: MIYAZAKI Yasumitsu
• 金额: $ 5.95万
• 依托单位: Toyohashi University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11555101/
• 关键词: Waveguide-Type optical Amplifiers; RF Spattering; Garnet; Er ions; Yb ions; Dynamic Response; Emission; Absorption; 蛍光分光特性; 液晶成長装置; 液結晶成長装置

Based on examination, we could obtain the following results in research of compact, broadband and high gain integrated amplifiers and circuits using Er doped garnet crystal thin-film.1. As for devices which Er doped and Er-Yb co-doped garnet thin film on YAG using the RF sputtering system, and device which Er:YIG thin film fabricated on GGG substrate, we evaluated many kinds of composition and crystalline structure, and compared those with conventional Er doped YGG crystal thin film. We finally reached a conclusion on the most suitable material structure. We have fabricated Ce, Bi doped YIG crystal thin film using LPE which was superior in crystal quality and growth controlling. And investigated the condition of fabricating crystal thin film, optimized it.2.We have measured the absorption and fluorescence spectrum of Er doped garnet thin film, and reached conclusion on the most suitable pump and signal light wavelength. Further more, using 1.5 μm region wavelength tunable laser measure … More d the loss of the waveguide on the most suitable wavelength, measured the absorption loss on the most suitable wavelength.3.We have carried out the theoretical analysis of static amplification characteristics under the steady-state condition. In the case of Er/Yb co-doped, compared with the case of Er doped only, we obtained high gain per unit length, and found it is desirable to miniaturize the device. We found that the amplified gain depending on the length of waveguide varied with Yb ion. And we optimized Yb ion concentrations.4.We have carried out the investigation on the static propagating property of pump light and signal light on the waveguide amplifier of which using Er/Yb co-doped garnet crystal thin-film. And we have done the study that the gain and noise properties depend on ion concentrations and propagated distance. Using a high precision laser scanning system, we made three-dimension waveguide, and expected improvement of amplified gain and efficiency.5. Considered the property of gain spectrum and waveguide dispersion, we have carried out the data analysis on transitional response of ultra short optical pulse amplifications for rare-earth ion, using time dependence 3 energy level and 4 energy level Rate equation. Comparatively studied on Er and Er-Yb doped amplification waveguides, we found that the shape of amplified outgoing pulse will become nonlinear. We have carried out theoretical analysis of dynamic gain property in the optical pulse of nano- and pico-second durations, and also did in femto-second durations. We have studied on the realization of the information processor (ultra fast, ultra parallel computer) which makes it possible ultra fast optical communication signal gain and high speed computing process.In future, we must examine improvement of amplification characteristics, efficiency, broadbandness and compactness. According to the results of research project, it has become possible more comprehensive study and development. Less

通过测试，我们可以得到以下结果：1.利用掺铒石榴石晶体薄膜研究小型、宽带、高增益集成放大器和电路。对于使用射频溅射系统在YAG上掺杂Er和Er- yb共掺杂石榴石薄膜的器件，以及在GGG衬底上制备Er: YGG薄膜的器件，我们评估了多种成分和晶体结构，并与传统的Er掺杂YGG晶体薄膜进行了比较。我们最终得出了最合适的材料结构的结论。我们用LPE制备了Ce， Bi掺杂YIG晶体薄膜，该薄膜在晶体质量和生长控制方面都有较好的效果。研究了晶体薄膜的制备条件，并对其进行了优化。我们测量了掺铒石榴石薄膜的吸收光谱和荧光光谱，得出了最合适的泵浦光波长和信号光波长。在此基础上，利用1.5 μm波长可调谐激光器测量了波导在最合适波长上的损耗，测量了波导在最合适波长上的吸收损耗。对稳态条件下的静态放大特性进行了理论分析。在Er/Yb共掺的情况下，与只掺Er的情况相比，我们获得了更高的单位长度增益，并且发现器件小型化是理想的。我们发现，放大增益随波导长度的变化而变化。并对Yb离子浓度进行了优化。采用铒镱共掺石榴石晶体薄膜，研究了泵浦光和信号光在波导放大器上的静态传播特性。我们已经研究了增益和噪声特性与离子浓度和传播距离的关系。利用高精度激光扫描系统，制作了三维波导，提高了放大增益和效率。考虑到增益谱和波导色散的特性，利用时间相关的3能级和4能级速率方程，对稀土离子的超短光脉冲放大的过渡响应进行了数据分析。通过对掺铒和掺铒镱放大波导的对比研究，发现掺铒镱放大后的出射脉冲形状会变得非线性。本文对纳米、皮秒和飞秒光脉冲的动态增益特性进行了理论分析。研究了信息处理器（超快、超并行计算机）的实现，使光通信信号的超快增益和计算的高速处理成为可能。未来，我们必须研究放大特性、效率、带宽和紧凑性的改进。根据研究项目的成果，对其进行更全面的研究和开发已成为可能。少

项目成果

Y.Inoue, Y.Miyazaki: "Field Analysis of Optical Image Transmission Using Graded Index Waveguides"Proc. of Progress in Electromagnetics Research Symposium(PIERS 2001), Osaka. 511 (2001)

Y.Inoue，Y.Miyazaki：“使用渐变折射率波导的光学图像传输的场分析”Proc。

M. Kagami, Y. Miyazaki, H. Ito and G. Sugimoto: "Simple Structural Quasi-Optical Circulator Composed of Tapering and Bending Waveguides"Trans. Of IEICE. Vol.J82-C-I,No.6. 349-358 (1999)

M. Kagami、Y. Miyazaki、H. Ito 和 G. Sugimoto：“由锥形和弯曲波导组成的简单结构准光环行器”Trans。

R. Balasubramanian, Y. Fukuyama and Y. Miyazaki: "Dynamic Characteristics of Yb-Sensitized Er-Doped Garnet Crystal Waveguide-Type Optical Amplifiers"Proc. Of OFSET 2000 (2000 Japan-China Joint Meeting on Optical Fiber Science and Electromagnetic Theory),O

R. Balasubramanian、Y. Fukuyama 和 Y. Miyazaki：“Yb 敏化掺铒石榴石晶体波导型光学放大器的动态特性”Proc。

R. Fukuo and Y. Miyazaki: "Photonic Analysis of X-ray Crystal Waveguide Consisting Periodic Array of Cylinders"Progress in Electromagnetics Research Symposium(PIERS 2001), Osaka. 14 (2001)

R. Fukuo 和 Y. Miyazaki：“由周期性圆柱阵列组成的 X 射线晶体波导的光子分析”电磁学研究研讨会进展（PIERS 2001），大阪。

Y. Miyazaki: "Spectral Expansion Method of Beam Guiding and Scattering at Arbitrary Dielectric Boundary Interfaces"Telecommunications and Radio Engineering, Moscow. (to be published). (2002)

Y. Miyazaki：“任意介电边界界面处的光束引导和散射的频谱扩展方法”，电信和无线电工程，莫斯科。