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Circularly polarizing fibers with a triple-lobe stress region

肖悦娱;颜锦奎;彭蕾;唐明珏

  A fiber structure with a circularly polarizing property is proposed.The fiber consists of a round core and a triplelobe stress region in the cladding,which is compatible with single-mode fibers,and it can be fabricated using conventional metal chemical vapor deposition processes.By coating a layer with a high-refractive index,the twist pitch required for resonant coupling is increased to hundreds of micrometers,and the mature pit-in-jacket drawing technique can be used.The polarization filtering properties of the fabricated circularly polarizing fibers are measured experimentally,showing high distinction ratios in a broad frequency region.……