Abstract
A circular ultra-short As2S3 filled double-core photonic crystal fiber polarization beam splitter is proposed. The finite element method is used to study the performance of the designed photonic crystal fiber polarization beam splitter. By filling high refractive index As2S3 into the central air hole, the coupling performance of the double-core PCF is improved. By optimizing geometric parameters, the splitting length of the circular beam splitter can be as short as 72.43 μm, and the extinction ratio can reach −151.42 dB. The high extinction ratio makes the circular polarization beam splitter have a good beam splitting function. The designed circular double-core photonic crystal fiber has the same cladding pore diameter, which is easier to prepare than other photonic crystal fibers with complex pore structure. Due to the advantages of high extinction ratio, extremely short beam splitting function and simple structure, the designed polarization beam splitter will be widely used in all-optical networks and optical device preparation.
Highlights
With the development of big data analysis and cloud computing technology, traditional communication methods are far from meeting people’s increasing demand for information
When the Photonic crystal fiber (PCF) core mode and the As2 S3 rod surface mode satisfy the phase matching condition, the PCF core energy will be coupled to the As2 S3 rod surface
This paper presents an ultra-short double-core As2 S3 filled circular PCF polarization beam splitter
Summary
With the development of big data analysis and cloud computing technology, traditional communication methods are far from meeting people’s increasing demand for information. The separate length is 0.175 mm, and the extinction ratio is −80.7 dB at the communication wavelength of 1550 nm. In 2016, Zi et al [25] designed a ultra-short polarization beam splitter based on liquid-filled PCF. In 2021, Qu et al [30] proposed a liquid crystal-filled twin-core PCF polarization beam splitter, which has a beam splitting length of 94 μm. Proposed a thermo-optically tunable gold-filled dual-core PCF polarization beam splitter. A circular ultra-short dual-core PCF polarization beam splitter is proposed. By optimizing the geometric parameters of PCF pore structure, the splitting length of the polarization beam splitter can be as short as. The extremely short beam splitting length and high extinction ratio make the PCF polarization beam splitter of this structure have important value in optical device applications
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