Novel ultra-wideband dual-core photonic crystal fiber

The invention discloses a novel ultra-wideband double-core photonic crystal fiber which can be used for manufacturing a polarization beam splitter. The ultra-wideband double-core photonic crystal fiber cladding is composed of a substrate material and dielectric holes, the dielectric holes comprise a non-central dielectric hole, a central inner dielectric hole and a central outer dielectric hole, the substrate material comprises a double-core area, an annular gap between the central inner dielectric hole and the central outer dielectric hole is a central dielectric ring, and the central dielectric ring is filled with graphene. The dual-core photonic crystal fiber polarization beam splitter is simple in structure and small in size, has the advantages of being high in light splitting ratio and large in working bandwidth, and through tolerance analysis, in the actual manufacturing process, the influence of optical fiber structure parameters changed by external factors on the performance ofthe polarization beam sp