Laser Journal, Volume. 45, Issue 11, 156(2024)
Photonic crystal fiber design with low flat dispersion, large mode field area, and support for 118 OAM modes
In order to improve the transmission characteristics of fiber-optic communication, a new air-hole arrangement structure ring photonic crystal fiber is designed, which has a large-diameter air-hole as the core, and the cladding is made of SiO2 as the base material, containing three layers of air-holes in the form of a rectangular, circular, and ring-cut-sector polygon. The transmission characteristics of photon orbital angular momentum modes in the designed fiber are analyzed based on the finite element method. The results show that the stable transmission of 118 OAM modes can be achieved in the high refractive index ring around the fiber core in the C+L band without the existence of radial higher-order modes, the maximum effective mode field area are 305.3 μm2, which obtained in 1.63 μm, which effectively increases its communication capacity, and the minimum effective refractive index difference between its neighboring vectorial modes is 5.43×10-3, the maximum confinement loss is 1.06×10-8 dB/m, the minimum nonlinear coefficient is 0.285 w-1 ·km-1, and the minimum dispersion of the vectorial modes is 2.68 ps/(km·nm), and the quality of intrinsic modes are all between 95.56%~98.37%, which could increase the quality of communication. This photonic crystal fiber can be applied to mode division multiplexing system, which provides a reference for improving the communication transmission efficiency.
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YAN Yupeng, SONG Xice, GUAN Lizhen, WANG Yuhang, PU Junyu, SUN Hongsen, LI Changjiang, LIU Kai, YU Xianlun. Photonic crystal fiber design with low flat dispersion, large mode field area, and support for 118 OAM modes[J]. Laser Journal, 2024, 45(11): 156
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Received: Dec. 22, 2023
Accepted: Jan. 17, 2025
Published Online: Jan. 17, 2025
The Author Email: Xianlun YU (839811547@qq.com)