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比较了在不同色散分布的色散渐减光纤中超连续(SC)谱的产生。结果表明,当光纤的色散值关于中心波长对称、且随着传输距离增加,经由反常色散区过渡到正常色散区的、凹形色散分布的色散渐减光纤更有利于产生平坦、带宽的超连续谱。从频域的全场方程出发,模拟了脉冲在光纤中的传输情形,发现脉冲在凹形色散分布的光纤中传输时,不仅在反常色散区能更大程度被压缩,在正常色散区由于存在零色散波长点,还能更进一步展宽,从而得到更宽、更平坦的超连续谱。在谱强为-27 dB时,谱宽可达到298 nm,比相同情况下的凸形色散的光纤中超连续谱增宽97 nm。结果显示,凹形色散分布的光纤比凸形色散分布的光纤在超连续谱的产生上有更明显的优势,可以得到更宽的超连续谱。
The generation of supercontinuum (SC) spectra in decreasing dispersion fibers with different dispersion was compared. The results show that when the dispersion value of optical fiber is symmetrical with respect to the center wavelength and the dispersion dispersion decreases with the transmission distance increasing, the dispersion dispersion of concave dispersion distributes to the normal dispersion region via the anomalous dispersion region, which is more conducive to the generation of flat and bandwidth supercontinuum Spectrum. Starting from the full-field equation in the frequency domain, we simulate the pulse transmission in the optical fiber. We found that when the pulse is transmitted in the concave dispersion fiber, it can not only be compressed to a greater extent in the anomalous dispersion region, Zero-dispersion wavelength point, but also further broadened, resulting in a wider, more flat supercontinuum. When the spectral intensity is -27 dB, the spectral width can reach 298 nm, which is 97 nm wider than the supercontinuum in the convex-dispersion optical fiber in the same situation. The results show that the optical fiber with concave dispersion distribution has more obvious advantages than the optical fiber with convex dispersion distribution in supercontinuum generation, and the wider supercontinuum can be obtained.