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Study on generation and propagation of sub-20 femto-second optical fiber soliton pulses

亚20飞秒光纤孤子脉冲的产生与传播研究

基本信息

批准号：
13450136
负责人：
TSUCHIYA Masahiro
金额：
$ 4.29万
依托单位：
National Institute of Information and Communications Technology (2003)The University of Tokyo (2001-2002)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

The effect of higher order fiber-optical soliton is often used for ultrashort pulse compression. Indeed, 20 femto-second (fs) pulse generation or shorter is possible through the method, which corresponds to only four cycles of 1500 nm electromagnetic wave. In order to clarify the ultimate performance and its limiting factors in the lower boundary of the time domain, we have utilized the phenomena of higher order fiber-optical soliton compression. Furthermore, we discussed on the framework for optimization of the spectral shapes thus generated for optical communication light source of multiple carriers. We have reached the conclusion, which includes some newly achieved knowledge, that the fourth order dispersion is an important feature for the ultimate characteristics of ultrashort fiber-optic soliton pulses since it leads to the limiting factor in the time domain and affects the high bandwidth super-continuum generation. The followings are the results obtained in the present research.( … More 1)The shortest fiber optic soliton pulse ever reported has been successfully derived. Its time period is 15.6 fs. We believe that the new temporal area in the fiber-optic ultrafast photonics has been established.(2)We pointed out that the ultimate pulse width of fiber-optical soliton is restricted by the fourth order dispersion through the anomalous dispersion bandwidth. This has been confirmed experimentally by means of systematic investigation on temporal widths of generated pulsed under a variety of conditions. Indeed, this is the first clear evidence that the fourth order dispersion effect of an optical fiber appears in a realistic and clear manner.(3)On the other hand, we found out experimentally that the fourth order dispersion effect can give rise to efficient parametric gain generation of broadband. Also, the theoretical explanation for the phenomena has been established.(4)On the basis of the results of (3), we demonstrated a few new schemes for broadband optical spectrum generation methods. Less

高阶光纤孤子效应常用于超短脉冲的压缩。实际上，通过该方法可以产生20飞秒（fs）或更短的脉冲，这对应于1500 nm电磁波的仅四个周期。为了阐明在时域下限的最终性能及其限制因素，我们利用了高阶光纤孤子压缩的现象。此外，我们讨论了优化的框架，从而产生的光谱形状的光通信光源的多载波。得出了四阶色散是决定超短光纤孤子脉冲的最终特性的一个重要特征的结论，它是超短光纤孤子脉冲在时域上的限制因素，影响了高带宽超连续谱的产生。以下是本研究中获得的结果。( ...更多信息 1)成功地导出了迄今为止报道的最短光纤孤子脉冲。其时间周期为15.6 fs。我们认为，光纤超快光子学中新的时间域已经建立。(2)We指出四阶色散通过反常色散带宽限制了光纤孤子的最终脉冲宽度。这已被实验证实，通过系统的调查在各种条件下产生的脉冲的时间宽度。事实上，这是第一个明确的证据，表明光纤的四阶色散效应以真实和清晰的方式出现。(3)On另一方面，我们从实验上发现四阶色散效应可以产生有效的宽带参量增益。并对这一现象进行了理论解释。(4)On在（3）结果的基础上，我们提出了几种新的宽带光谱产生方法。少