A dual-core photonic crystal fiber polarization beam splitter based on liquid crystal filling

Abstract

The invention discloses a dual-core photonic crystal fiber polarization beam splitter based on liquid crystal filling, which includes a core area and a cladding area located on the outer layer of the core area; the core area includes a first air hole, a first core and The second fiber core; the first air hole is located in the center of the fiber core area and is completely filled with nematic liquid crystal; the first fiber core and the second fiber core are respectively located on both sides of the first air hole and are at the same distance from the first air hole; The cladding region includes a plurality of second air holes, a plurality of third air holes and a plurality of fourth air holes; taking the core region as the center, a plurality of second air holes, third air holes and fourth air holes surround the fiber The core area has a multi-layer arrangement structure, and each layer of the multi-layer arrangement structure is a hexagonal structure except the outermost layer. The invention overcomes the disadvantages of long length, low extinction ratio and narrow bandwidth of traditional beam splitters, and is expected to be applied in ultra-large-capacity and integrated all-optical networks in the future.

Description

technical field [0001] The invention relates to the technical field of photonic crystal fiber beam splitters, in particular to a dual-core photonic crystal fiber polarization beam splitter based on liquid crystal filling. Background technique [0002] Polarization beam splitter is an important passive optical device in optical communication system, which can split a beam of light into two orthogonal polarization beams and transmit them in different directions. In the early days, polarization beam splitters based on traditional optical fibers were usually on the order of centimeters in length due to their small birefringence coefficients, low extinction ratio, and narrow bandwidth, which gradually failed to meet the needs of modern communications towards large capacity and integration need. At the end of the 20th century, the proposal of the concept of photonic crystal fiber and its first successful drawing have attracted widespread attention from scholars. The flexible and...

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Problems solved by technology

[0006] The invention provides a dual-core photonic crystal fiber polarization beam splitter based on liquid crystal filling to solve the technical problems of long length, low extinction ratio and narrow bandwidth existing in traditional beam splitters

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