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通过对ＰＰＱ薄膜的吸收光谱的计算分析，由Ｋｒａｍｅｒｓ－Ｋｒｏｎｉｇ关系得出ＰＰＱ膜在５５０ｎｍ～７００ｎｍ左右波段存在负群速色散区，并且色散量相对较小，｜β２｜＜１．２ｐｓ２／ｍ。这使得对飞秒激光脉冲在ＰＰＱ平面光波导中传输的描述可以忽略色散项。根据这一简化，仅考虑自相位调制（ＳＰＭ）效应，由飞秒对撞锁模激光脉冲的光谱展宽所计算出ＰＰＱ的非线性折射率系数ｎ２，与报道的结果吻合得很好。
Based on the Kramers-Kronig relationship, the PPQ film has a negative group velocity dispersion region in the wavelength range from 550 nm to 700 nm with relatively small dispersion and | β2 | <1.2 ps2 / m. This allows the description of the transmission of femtosecond laser pulses in the PPQ planar optical waveguide to ignore the chromatic dispersion term. According to this simplification, the nonlinear refractive index coefficient n2 of PPQ calculated from the spectral broadening of the femtosecond laser pulse mode-locked laser pulse is considered only in consideration of the self-phase modulation (SPM) effect, which is in good agreement with the reported results.