3results about How to "Optimizing the drawing process" patented technology

This invention relates to a quadrilateral photonic crystal fiber filter based on dual-wavelength filtering, belonging to the field of fiber optics and photonic device technology. It includes a substrate and a fiber core disposed within the substrate, and a cladding surrounding the fiber core. The cladding contains multiple layers of air holes extending along the fiber axis, arranged periodically in a two-dimensional quadrilateral lattice. A metal thin film is disposed within the cladding to excite surface plasmon resonance (SPR). At least one non-circular air hole is also disposed within the cladding to enhance the birefringence of the fiber. The multiple air holes, metal thin film, and non-circular air holes enable the filter to selectively filter orthogonal polarization states in two different communication bands. This invention, based on SPR and employing a quadrilateral lattice structure, achieves polarization-selective filtering in two communication bands and exhibits good tolerance to manufacturing errors; simultaneously, its regular structure makes it easy to manufacture.

The utility model discloses a kind of flow guide structure and single crystal furnace applied to single crystal furnace hot field.The flow guide structure can include: flow guide cylinder and flow guide component, wherein, flow guide component includes first flow guide part and second flow guide part, first flow guide part extends from the outer periphery of the lower end opening of flow guide cylinder in the direction of radial away from the central axis of flow guide cylinder and simultaneously downwardly inclined relative to the lower end opening outer periphery of flow guide cylinder, second flow guide part extends from the extension end of first flow guide part in the direction of radial away from the central axis of flow guide cylinder and simultaneously upwardly inclined relative to first flow guide part.The flow guide structure can accelerate the argon flow rate passing through liquid surface, to take away more oxygen impurities, reduce the oxygen content of drawn single crystal silicon rod.

This invention discloses a (S+C+L) band hybrid light-guiding type single-polarization single-mode hollow-core optical fiber, belonging to the field of optical fiber technology. It includes an outer sheath tube, eight cladding tubes with identical inner diameters and thicknesses, uniformly arranged around the center of the outer sheath tube and tightly attached to its inner side, a pair of negative curvature arc layers with identical radii of curvature and thicknesses, symmetrically distributed along the x and y axes, and a central region of the fiber. The two symmetrical negative curvature arc layers in this invention achieve single-polarization transmission of the y-polarized fundamental mode through a hybrid light-guiding mechanism of anti-resonance and total internal reflection. The eight cladding tubes regulate the transmission loss of other higher-order modes through an anti-resonance light-guiding mechanism, achieving single-mode transmission of the optical fiber. This invention exhibits excellent high birefringence and single-polarization single-mode characteristics in the (S+C+L) band, and the loss of different modes can be effectively controlled by adjusting the light-guiding capabilities of different light-guiding mechanisms.