A Novel Liquid Crystal-Filled, Dual-Core Photonic Crystal Fiber Polarization Beam Splitter Covering the E + S + C + L + U Communication Band
This paper proposes a novel liquid crystal-filled, dual core photonic crystal fiber polarization beam splitter (LC-DC-PCF PBS) based on the coupled mode theory of DC-PCF. The mode birefringence of odd and even modes, coupling lengths (<i>CL</i>s) of the X-polarization (X-pol) and Y-polar...
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| Autores principales: | , , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/95baf71bf344469e9090715fa58ea72f |
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| Sumario: | This paper proposes a novel liquid crystal-filled, dual core photonic crystal fiber polarization beam splitter (LC-DC-PCF PBS) based on the coupled mode theory of DC-PCF. The mode birefringence of odd and even modes, coupling lengths (<i>CL</i>s) of the X-polarization (X-pol) and Y-polarization (Y-pol), and the corresponding coupling length ratio (<i>CLR</i>) of the proposed LC-DC-PCF PBS filled without LC E7 and with LC E7 are compared. The change rules of the <i>CLs</i> of the X-pol and Y-pol and <i>CLR</i> of the proposed LC-DC-PCF with wavelengths for different cladding microstructure parameters were investigated. The relationships between the X-pol and Y-pol normalized output powers in core A of the proposed LC-DC-PCF PBS and the propagation length at the wavelength of 1.604 μm are discussed. Finally, by studying the change of extinction ratio (<i>ER</i>) with wavelength, the LC-DC-PCF PBS <i>ER</i> of 60.3 and 72.2 dB at wavelengths 1.386 and 1.619 μm are achieved, respectively. The final splitting length (<i>L</i><sub>S</sub>) is 94 μm, and the splitting bandwidth is 349 nm (1.352~1.701 μm), covering the whole of the E + S + C + L + U communication bands. The proposed LC-DC-PCF PBS has good beam-splitting performance, such as ultra-short <i>L</i><sub>S</sub> and ultra-wide splitting bandwidth, with potential applications in laser, sensing, and communication systems. |
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