COMPUTER SIMULATION OF THE OPTICAL SOLITON USING THE NONLINEAR LORENTZ COMPUTATIONAL MODEL

1993财政年度，首席研究员在美国普林斯顿大学等离子体物理实验室（PPPL）工作期间开始了这项研究。研究了非线性洛腾兹计算模型的适用性和潜力，并将其扩展到包括其他效应。暗孤子是一个NRZ光脉冲，与孤子通信的先导候选亮孤子相反，是一个RZ光脉冲。暗孤子是传统光无极区通信技术的自然发展，本文利用NLCM模拟了暗孤子在光纤传输中的应用。首席研究员在日本电子、信息和通信学会的口头会议上报告了初步结果。题目是“NLCM方法对超短暗孤子的计算机模拟（C-195）”。利用NLCM方法进行计算机模拟，假定电势和极限为10tbps。该结果的摘要发表在《光学快报》上。题目是“暗孤子通信系统的潜在能力”。将仿真模型扩展为准二维模型。在该模型中，两个一维代码同步运行，边界条件以联立方程的形式求解。采用准二维模型对y分裂光电路进行了仿真。通过将pi/2移相器与准二维模型相结合，模拟了光开关的作用。在假设离子受电磁波运动的情况下，受激拉曼散射的影响已被纳入NLCM。采用了最简单的模型，但在模拟中观测到了Stokes散射波。

In 1993 fiscal year, the head investigator started this study during stay at Princeton Plasma Physics laboratory in Princeton University (PPPL), USA.Applicability and potential of the the Nonlinear Lortentz Computational Model (NLCM) have been studeid and extended toinclude another effects.1. The dark soliton is an NRZ optical pulse, contrary to the bright soliton which is the forerunner candidate of the soliton commnucation and is a RZ optical pulse. As a natural development of the traditional optical NRZ communication technique, the application of the dark soliton to the fiber transmitting is simulated by using the NLCM.The head investigator has reported the preliminary results in the oral session of the Japanese Society of Elctronics, Information, and Communucation. The title is "Computer Simulation of the Ultrashort Dark Soliton by the NLCM method (C-195)".2. The potentiality and the limit are presumed to be 10 Tbit/s by the computer simulation using the NLCM method. The abstract of the result is submitted to the Optics Letters. The title is "Potential capability of the dark soliton communication system".3. The simulation model is extended to the quasi 2-dimensional model. In this new model, two one-dimensional codes are synchronously run and the boundary condisions are solved as the simultaneous equation.4. The Y-splitting optical circuits are simulated by useing the quasi 2-dimensional model. By combining the pi/2 phase shifter with the quasi 2-dimensional model, the action of the optical switching hase been simulated.5. The effects of the stimulated Raman scattering has been incorporated to the NLCM,assuming that the ion is movile by the electromagnetic wave. The simplest model is adopted, but the Stokes scattering wave has been observed in the simulation.