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高非线性光纤正常色散区脉冲尾部非频移分量演化 被引量:2
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作者 孙剑 李唐军 +4 位作者 王目光 贾楠 石彦超 王春灿 冯素春 《物理学报》 SCIE EI CAS CSCD 北大核心 2019年第11期186-195,共10页
基于广义非线性薛定谔方程(对皮秒双曲正割光脉冲在高非线性光纤(highly nonlinear fiber, HNLF)正常色散区传输时尾部非频移分量的演化情况进行了理论研究.研究结果表明:交叉相位调制(cross-phase modulation, XPM)和受激拉曼散射(stim... 基于广义非线性薛定谔方程(对皮秒双曲正割光脉冲在高非线性光纤(highly nonlinear fiber, HNLF)正常色散区传输时尾部非频移分量的演化情况进行了理论研究.研究结果表明:交叉相位调制(cross-phase modulation, XPM)和受激拉曼散射(stimulated Raman scattering, SRS)在其演化过程中起主导作用,而三阶色散对其直接影响较小.在XPM效应的作用下,处于脉冲前沿和后沿尾部的非频移分量逐渐减弱,其光谱分别发生红移和蓝移,这一过程具有对称性;SRS会加速前沿尾部非频移分量的减弱过程,而减缓后沿的减弱过程,这一现象在脉冲峰值功率较高时更为明显.从脉冲尾部非频移分量演化角度分析了啁啾脉冲在HNLF正常色散区的光谱和波形特性. 展开更多
关键词 超连续谱 非线性光纤光学 受激拉曼散射 交叉相位调制
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双包层光子晶体光纤热效应及其影响分析
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作者 巩玲仙 郭红英 +1 位作者 王春灿 任国凤 《光电子.激光》 EI CAS CSCD 北大核心 2020年第12期1253-1261,共9页
本文对双包层光子晶体光纤热效应及其模式特性的影响进行了深入的分析和研究,采用有限元方法构建了双包层光子晶体光纤的多物理场耦合模型。建立了双包层光子晶体光纤截面的热传导方程,分别研究了双包层光子晶体光纤径向温度分布与光纤... 本文对双包层光子晶体光纤热效应及其模式特性的影响进行了深入的分析和研究,采用有限元方法构建了双包层光子晶体光纤的多物理场耦合模型。建立了双包层光子晶体光纤截面的热传导方程,分别研究了双包层光子晶体光纤径向温度分布与光纤结构参数、换热条件和热负载的关系。进一步地研究了热效应对光纤基模的有效折射率、有效模场面积和模场分布的影响。双包层光子晶体光纤的径向温度分布与其结构参数紧密相关。最高温度位于纤芯的中心,并且随着空气孔比例的增加而增大。同时纤芯的温度随着换热系数和热负载的降低而降低。光纤的温度梯度随着换热系数和热负载的增加而线性增加。热效应同样影响光纤基模场的分布。热负载从10 W/m增加到30 W/m时,基模有效折射率逐渐增加,基模的有效面积线性降低。并且波长越短,基模场收缩越明显,热效应越严重。 展开更多
关键词 光子晶体光纤 热效应 有限元方法
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Numerical simulation of supercontinuum generation based on the active nonlinear fiber
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作者 JIA Cai-ping wang chun-can 《Optoelectronics Letters》 EI 2021年第3期149-154,共6页
The supercontinuum(SC) generation(SCG) based on the active nonlinear fiber has attracted much attention due to its advantages in the energy amplification and spectral broadening of the output pulses. The active step-i... The supercontinuum(SC) generation(SCG) based on the active nonlinear fiber has attracted much attention due to its advantages in the energy amplification and spectral broadening of the output pulses. The active step-index single-mode fiber is proposed for the SCG. A flat normal-dispersion profile ranging from 1 240 nm to 2 550 nm can be obtained by tuning the germanium(Ge) concentration and core size, where the values of the dispersion slope are between-0.01 ps/nm^(2)/km and 0.05 ps/nm^(2)/km. Furthermore, the output pulse from the 5 m Er-doped normal-dispersion fiber(NDF) with g0=9 m^(-1) has a peak power of 2.8 kW and a 20 dB spectral bandwidth of 507 nm ranging from 1 262 nm to 1 769 nm by using the 1 550 nm and 1 ps Gaussian pulse with a peak power of 10 kW as the pumping source. 展开更多
关键词 FIBER tuning PUMPING
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Numerical simulation of asymmetric dual-core fiber with large group-velocity dispersion
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作者 YANG Jian-fang wang chun-can 《Optoelectronics Letters》 EI 2021年第2期96-101,共6页
The asymmetric dual-core fiber(ADCF) is proposed to obtain large group velocity dispersion(GVD) because of the coupling effects between the fundamental modes of the central core and high-order modes of the side core. ... The asymmetric dual-core fiber(ADCF) is proposed to obtain large group velocity dispersion(GVD) because of the coupling effects between the fundamental modes of the central core and high-order modes of the side core. The supermodes of the ADCF can provide anomalous-and normal-GVD profiles with large peak values at the maximum dispersion wavelengths. The maximum dispersion wavelengths can be shifted in the wavelength window of 1 550 nm by properly tuning the refractive indexes and diameters of the cores or spacing between the two cores. Furthermore, the numerical results show that the ADCF with the normal-GVD supermode 1 can be employed in the pulse broadening, where the broadening factor can reach more than 30 without pulse distortion from nonlinear effects. 展开更多
关键词 FIBER tuning DISPERSION
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