A gold-filled ultrashort dual-core photonic crystal fiber polarization beam splitter

Abstract

The invention discloses an ultrashort dual-core photonic crystal fiber polarization beam splitter based on gold filling, comprising: a core area and a cladding area; the core area includes a first elliptical hole and two second elliptical holes , two third elliptical holes; the first elliptical hole is located in the center of the fiber core region; the two second elliptical holes are respectively arranged on the upper and lower sides of the first elliptical hole in the vertical direction, and the two second elliptical holes The two elliptical holes are filled with metal gold; the left and right sides of the first elliptical hole in the horizontal direction are respectively the first core and the second fiber core of the optical fiber; the two third elliptical holes are respectively arranged on the first fiber The left and right sides of the core and the second core in the horizontal direction; the cladding region is located on the outer layer of the core region, and the cladding region includes a plurality of uniformly arranged first air holes and second air holes; The beam splitter introduces the surface plasmon resonance effect based on gold filling, which has better transmission effect and shorter device length than the all-air-hole photonic crystal fiber.

Description

technical field [0001] The invention relates to the field of photonic crystal fiber beam splitters, in particular to an ultrashort dual-core photonic crystal fiber polarization beam splitter based on gold filling. Background technique [0002] The outstanding features of photonic crystal fibers are gradually excavated with people's attention. The outstanding features of photonic crystals are the urgent needs of optical communication devices, and the polarization beam splitter is an important one in optical communication devices. The function of the beam device is also reflected in people's eyes. The photonic crystal fiber has a flexible structure and novel features, so the photonic crystal fiber polarization beam splitter has advantages that traditional beam splitters do not have. Polarizing beam splitters have the function of separating a beam of light with two polarization states, and are therefore widely used in optical communication systems as an important optical compo...

AI Technical Summary

Problems solved by technology

Moreover, the core of this type of beam splitter is the same as the traditional photonic crystal fiber, which is formed by the absence of air holes, and because the core area is used to construct a birefringent structure, the core is generally not a regular circular shape.

However, due to the low birefringence of this type of beam splitter, the fiber length is often very long, which cannot meet the needs of device miniaturization

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