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根据薄膜窄带滤光片在倾斜入射时的特性,通过改进间隔层膜系结构调整其等效折射率,可以设计出具有稳定透射峰值和带宽的角度调谐窄带滤光片.倾斜入射时窄带滤光片透射光的S和P偏振分量的中心波长会随着入射角度的增大出现分离现象,产生较大的偏振相关损耗.分析了偏振分离现象出现的原因和其与滤光片等效折射率的关系,提出了消除偏振分离现象的方法.根据薄膜矩阵理论建立了分析模型并提出了一种该可调滤光片的设计方法,根据开发的程序优化设计并制备了一组用于100 GHz密集波分复用(DWDM)系统的低偏振相关损耗的四腔角度调谐窄带滤光片,实验结果证明其满足设计要求并有接近20 nm的可调范围.
According to the properties of thin-film narrow-band filters at oblique incidence, the tunable narrow-band filters with stable transmission peak and bandwidth can be designed by improving the structure of spacer layers and adjusting the equivalent refractive index. Narrow-band filters The central wavelengths of the S and P polarization components of the transmitted light of the film appear segregation with the increase of the incident angle, resulting in larger polarization-dependent loss.The reason why the polarization separation phenomenon appears and its relationship with the equivalent refractive index of the filter , A method to eliminate polarization separation was proposed.Analytical model was established based on the thin film matrix theory and a design method of the tunable filter was proposed. According to the developed program, The low polarization dependent loss of narrow-band tunable narrow-band tunable four-cavity narrow-band filters in Dense Wavelength Division Multiplexing (DWDM) systems have been experimentally demonstrated to meet design requirements and have tunable ranges approaching 20 nm.