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利用广义非线性薛定谔方程,分别数值计算了光子晶体光纤(Photonic Crystal Fiber,PCF)中的受激拉曼散射(Stimulated Raman Scattering,SRS)所致啁啾、自陡(Self-steepening,SS)所致啁啾及综合各种效应所得的总啁啾.计算结果表明:SRS啁啾的中心漂移而且正、负啁啾不对称;SS啁啾主要集中在脉冲的后沿;各种非线性总啁啾增大.由此得出,SRS引起频谱的红移与不对称,而SS则对频谱的不对称展宽贡献最大,各种非线性总的作用结果将产生不对称的红移的超连续(Supercontinuum,SC)谱.
By using the generalized nonlinear Schrödinger equation, the chirp, self-steepening (SS) induced by stimulated Raman scattering (SRS) in Photonic Crystal Fiber (PCF) Chirp and synthesis of various effects of the total chirp.The calculated results show that: SRS chirp center drift and positive and negative chirp asymmetry; SS chirp is mainly concentrated in the pulse of the edge; a variety of nonlinear total chirp The result shows that SRS causes the redshift and asymmetry of the spectrum, while SS contributes the most to the unsymmetrical spread of the spectrum. The total nonlinear effect of the various nonlinearities will produce asymmetric redshift supercontinuum Supercontinuum, SC) spectrum.