Propagation Theory of Nonlinear Optical Waveguides and Simulation of Optical Soliton Propagation

非线性光波导传播理论与光孤子传播模拟

• 批准号: 09650039
• 负责人: KOSHIBA Masanori
• 金额: $ 1.73万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650039/
• 关键词: nonlinear optical waveguide; optical soliton; temporal soliton; spatial soliton; spatio-temporal soliton; optical Kerr-effect; beam propagation method; time-domain beam propagation method; 非線性光導波路

The results of this research are as follows :1. Higher order effects such as third-order dispersion, shock effect, and soltion self-frequency shift on all-optical logic gates that use asymmetric nonlinear optical fiber couplers were investigated, and it was found that third-order dispersion seriously affects the operations of logic devices. In order to diminish the degradation, the bandwidth limited amplification was introduced. The logic functions can be improved by trapping only the soliton components in the finite gain-bandwidth.2. A three-dimensional beam propagation method was developed for the analysis of nonlinear optical fibers. All-optical logic gates with practical, three-dimensional geometry consisting of optical fibers and a nonlinear film were proposed, and their operations of Boolean arithmetric were demonstrated.3. A wide-angle finite element beam propagation method based on the Fade approximation was developed for both TB and TM waves propagating in nonlinear optical waveguides. In order to avoid nonphysical reflections from computational window edges, the transparent boundary condition and the perfectly matched layer were introduced, and to improve numerical accuracy, the finite element mesh and the reference refractive index were adaptively renewed at each propagation step.

本研究的结果如下： 1．研究了采用非对称非线性光纤耦合器的全光逻辑门的三阶色散、冲击效应、溶液自频移等高阶效应，发现三阶色散严重影响逻辑门的运行。设备。为了减少衰减，引入了带宽限制放大。通过在有限增益带宽内仅捕获孤子分量可以改善逻辑功能。2．开发了一种三维光束传播方法来分析非线性光纤。提出了由光纤和非线性薄膜组成的具有实用三维几何结构的全光逻辑门，并演示了它们的布尔算术运算。 3．针对非线性光波导中传播的 TB 波和 TM 波，开发了一种基于 Fade 近似的广角有限元光束传播方法。为了避免计算窗口边缘的非物理反射，引入了透明边界条件和完美匹配层，并且为了提高数值精度，在每个传播步骤自适应地更新有限元网格和参考折射率。

项目成果

小柴正則: "Reduction in Higher Order Effects on Logic Functions of Asymmetric Nonlinear Optical Fiber Couplers by Band width Limited Amdification" Journal of Lightwave Technology. 15・2. 279-287 (1997)

Masanori Koshiba：“通过带宽有限修正减少非对称非线性光纤耦合器逻辑函数的高阶效应”，光波技术杂志 15・2（1997 年）。

小柴正則: "Reduction in Higher Order Effects on Logic Functions of Asymmetric Nonlinear Optical Fiber Couplers by Bandwidth Limited Amplification" Journal of Lightwave Technology. 15・2. 279-287 (1997)

Masanori Koshiba：“通过带宽有限放大减少非对称非线性光纤耦合器逻辑函数的高阶效应”，《光波技术杂志》15・2（1997）。

Takashi YASUI,Masanori KOSHIBA,and Yasuhide TSUJI: "Finite Element Beam Propagation Method for Nonlinear Optical Waveguides" Transactions of IEICE. Vol.J81-C-I. 417-422 (1998)

Takashi YASUI、Masanori KOSHIBA 和 Yasuhide TSUJI：“非线性光波导的有限元光束传播方法”IEICE 交易。

小柴正則: "光波の電磁界解析法" 光学. 27・11. 622-625 (1998)

小芝正典：“光波的电磁场分析方法”光学27・11。

Akira NIIYAMA and Masanori KOSHIBA: "3-Dimensional Beam Propagation Analysis of Nonlinear Optical Fibers" IEICE Transactions on Communications. Vol.E80-B. 522-527 (1997)

Akira NIIYAMA 和 Masanori KOSHIBA：“非线性光纤的三维光束传播分析”IEICE Transactions on Communications。