Dual-core PCF-based THz polarization beam splitter with broad bandwidth and ultra-high extinction ratio

Jianxiang, Zhang

doi:10.1016/j.ijleo.2021.168425

Cited by 6 publications

(1 citation statement)

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“…However, with the rapid advancement of optical communication technology, traditional PBS based on conventional optical fibers has gradually become inadequate to meet practical demands, primarily due to limitations such as long splitting lengths and poor performance. Since 1996, photonic crystal fiber (PCF) has garnered significant attention due to its flexible tunable structure and unique optical characteristics [1], positioning it as a highly promising design solution for PBS [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Dual-Core Photonic Crystal Fiber Polarization Beam Splitter Based on a Nematic Liquid Crystal with an Ultra-Short Length and Ultra-Wide Bandwidth

Ji,

Du,

Dai

et al. 2024

Electronics

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This paper presents a novel pentagonal structure dual-core photonic crystal fiber polarizing beam splitter (PS-DC-PCF PBS) filled with a nematic liquid crystal (NLC) in the central hole. Unlike previous designs with symmetric arrangements, the upper and lower halves of the structure have different air hole arrangements. The upper half consists of air holes arranged in a regular quadrilateral pattern, while the lower half features a regular hexagonal arrangement of air holes. By filling the central hole with birefringent liquid crystal, the birefringence of the structure is enhanced, reducing the coupling lengths along the x polarization and y polarization directions. The polarization properties, coupling characteristics, and the influence of different structural parameters on the extinction ratio of the polarizing beam splitter are analyzed using the full-vector finite element method. Simulation results demonstrate that the designed PS-DC-PCF PBS achieves a maximum extinction ratio (ER) of 72.94 dB with a splitting length of only 61.9 μm and a wide operating bandwidth of 423 nm (1.324–1.747 μm), covering most of the O, E, S, C, L, and U communication bands. It exhibits not only ultra-short splitting lengths and ultra-wide splitting bandwidth but also good manufacturing tolerances and anti-interference capabilities. The designed PS-DC-PCF PBS could provide crucial device support for future all-optical communication systems and has potential applications in fiber optic communication or fiber laser systems.

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