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
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
基金This work has been supported by the National Natural Science Foundation of China(No.61575018)。
文摘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.
基金This work has been supported by the National Natural Science Foundation of China(No.61575018)。
文摘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.