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利用耦合非线性微分方程组求解饱和吸收体光栅(SAG)的损耗谱,得到了在无谐振腔时SAG参数与光栅带宽、中心频率损耗、边模抑制比等光栅滤波特性的关系。考虑谐振腔的存在,对SAG纵模边模抑制比进行修正,数值分析了优化区范围及优化程度。结果表明,当满足饱和吸收体长度约为腔内光纤长度1/3时,可实现平坦的边模损耗谱,且在小于由注入功率决定的掺铒光纤长度内,纵模的边模抑制比较无谐振腔时提高了0.3～0.6dB。采用扫频法初步验证了达到平坦边模损耗谱的条件。
The relationship between the SAG parameters and the grating characteristics such as grating bandwidth, center frequency loss and side mode suppression ratio in the absence of resonant cavity was obtained by coupling the nonlinear differential equations to the SAG loss spectrum. Considering the existence of resonant cavity, the SAG longitudinal mode edge mode suppression ratio is corrected, and the optimization range and optimization degree are analyzed numerically. The results show that when the length of saturable absorber is about 1/3 of the length of the optical fiber in the cavity, a flat side-mode loss spectrum can be achieved, and the side mode suppression of the longitudinal mode is less than that of the erbium-doped fiber No resonance cavity increased by 0.3 ~ 0.6dB. The method of sweeping frequency is used to verify the flat spectral loss spectrum.