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基于耦合模理论,利用逆向递推传输矩阵方法数值研究了λ/4相移光栅的双稳特性,数值研究了光纤光栅透射输出端面存在反射时λ/4相移光栅的双稳开关特性,以及啁啾的引入对其开关性能的影响。结果表明,对于反射相位叠加加强,可以使λ/4相移光栅的开关阈值能量得到降低,但开关对比度将下降,其产生的原因主要是由于光栅内部能量分布不均匀;在λ/4相移光纤光栅中引入负啁啾,能使开关对比度得到较大的提高,但双稳阈值开启能量会增加;引入正啁啾,可进一步降低开关阈值,但开关对比度会下降。
Based on the coupled-mode theory, the bistability of λ / 4 phase-shifted grating is numerically investigated by using the method of inverse recursive transfer matrix. The bistable switching characteristics of λ / 4 phase-shifted grating are investigated numerically when there is reflection on the transmission output end of the fiber grating. The Influence of Chirp on Its Switching Performance. The results show that the switching threshold energy of the λ / 4 phase shift grating can be reduced, but the switching contrast ratio will decrease due to the superposition of the reflection phase. The reason for this is that the energy distribution inside the grating is not uniform. The introduction of negative chirp in FBG can greatly improve the contrast of the switch, but the energy of the bistable threshold is increased. Introducing the positive chirp can further reduce the switching threshold, but the switching contrast will decrease.