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运用多极法,通过优化孔节距和包层空气孔半径设计了一种具有双零色散波长的高非线性光子晶体光纤,利用分步傅里叶方法数值模拟了超短脉冲在其中传输的情况,发现经过传输,两个零色散波长之间的主要能量被转换至位于正常色散区的两个边带峰处。泵浦的转化率很高,以至于多于99%的光能都被转移至两边带峰,且两边带峰很平坦,它们对波长波动,但对脉冲能量和泵浦脉冲的啁啾不敏感,这就产生了高稳定性的谱带。
By using the multipole method, a highly nonlinear photonic crystal fiber with double zero-dispersion wavelength is designed by optimizing the hole pitch and the radius of the cladding air hole. The staged Fourier method is used to numerically simulate the propagation of ultrashort pulses It was found that after transmission, the main energy between the two zero-dispersion wavelengths was converted to the two sideband peaks located in the normal dispersion region. The conversion rate of the pump is so high that more than 99% of the light energy is transferred to both sidebands with flat peaks on both sides, which are wavelength-dependent but insensitive to the pulse energy and the chirp of the pump pulse This produces a highly stable band.