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为进一步研究非线性渐增光纤中超短脉冲自相似演化的特性,利用数值仿真的方法分析了入射脉冲能量、脉冲宽度和类增益系数3个因素对输入脉冲自相似演变的影响。结果显示:入射脉冲能量和类增益系数对自相似演变的影响较为显著,在增大入射脉冲能量或类增益系数的情况下均可加速自相似演化的速度,即缩小演化所需的特征距离;而脉冲宽度对自相似演化的速度影响则十分微弱。

文章数值分析了负色散掺铒光纤放大器（EDFA）中基孤子脉冲传输及啁啾特性,给出了一种利用EDFA获得线性啁啾的新方法。数值分析结果发现:增益系数μ1时,基孤子脉冲在EDFA中传输能够获得很好的线性啁啾,并且啁啾的特性受选取的EDFA长度L的影响,L越大时线性啁啾越明显,线性啁啾所占的脉冲区域越窄。最后计算了输出脉冲在啁啾补偿后获得的压缩因子和基座能量比。

文章利用脉冲对的交叉相位调制（XPM）效应和非线性掺铒光纤放大环镜（ED-NALM）的整形放大作用,提出了一种对无啁啾高斯脉冲进行脉冲压缩的设计方案。数值模拟的结果表明,利用此方案可将脉宽为10 ps、中心波长为1 553 nm的无啁啾高斯脉冲压缩成脉宽为150 fs的无基座超短脉冲,且脉冲得到了很好的放大。

在考虑了光纤光栅（FG）的相位分布之后,根据光纤光栅外腔半导体激光器（FGESL）所满足的阈值条件,从理论上研究了前端面反射率对光纤光栅长外腔半导体激光器（LECFGSL）激射波长温度稳定性的影响。数值模拟的结果表明:随着温度的变化,LECFGSL的激射波长围绕光栅布拉格反射波长上下波动,激光器前端面反射率对激射波长波动幅度有较大的影响,当前端面反射率

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Under the guidance of the new development paradigm, the Chinese Academy of Sciences (CAS) has started a series of pioneering international cooperation in the Belt and Road countries with scientific and technological innovation, especially along the 21st Century Maritime Silk Road. CAS advanced the practical cooperation with the research institutions of the countries to improve their research and innovation capabilities. Taking the example of high-quality development, the China-Sri Lanka Joint Center for Education and Research (CSL-CER), satisfied the Sri Lanka's demands for science and education. This paper describes the progress and significance of achieved results by promoting high-quality development, and suggests for the development of CSL-CER in the future. [ABSTRACT FROM AUTHOR]

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Objective To explore the clinical features, diagnosis and treatment of Calcifying Fibrous Tumor（CFT） in the scrotum. Methods A retrospective analysis of the clinical data of a pediatric CFT in the scrotum admitted to our hospital was reviewed, and the clinical characteristics and methods of diagnosis and treatment were discussed in combination with literatures. Results The child had no symptoms. The scrotum color Doppler ultrasound and CT showed multiple calcifications in the scrotum. The tumor was excised under general anesthesia. There was no malignant component in the frozen pathological examination. The pathological diagnosis was CFT. There was no recurrence or metastasis in the follow-up period of 6 months. Conclusion The diagnosis of CFT of the scrotum relies on histopathological examination, and complete surgical resection of the mass is safe and effective. [ABSTRACT FROM AUTHOR]