We propose a polarization-insensitive ultra-broadband mode filter based on a 3D graphene structure buried in a few-mode optical waveguide. Our experimental device fabricated by burying an L-shaped graphene structure in a three-mode polymer waveguide provides polarization-insensitive filtering of the fundamental mode, while keeping the higher-order modes, with a mode extinction ratio of ${\sim}{{17}}\;{\rm{dB}}$ over the ${\rm{S}} + {\rm{C}} + {\rm{L}}$ band and beyond.

中文翻译：

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基于掩埋在光波导中的3D石墨烯结构的对偏振不敏感的超宽带模式滤波器

我们提出了一种基于3D石墨烯结构的偏振不敏感超宽带模式滤波器，该结构埋在少数模式光波导中。通过将L形石墨烯结构掩埋在三模聚合物波导中而制成的我们的实验装置可对基本模进行偏振不敏感的滤波，同时保持高阶模，并且消光比为$ {\ sim} {{ 17}} \; {\ rm {dB}} $超过$ {\ rm {S}} + {\ rm {C}} + {\ rm {L}} $频段。