首页|Graded ring-core photonic crystal fiber for the transmission of OAM modes with high mode purity and quality in C plus L bands
Graded ring-core photonic crystal fiber for the transmission of OAM modes with high mode purity and quality in C plus L bands
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NSTL
Elsevier
In order to enhance the OAM mode purity and quality, we propose a graded-index ring-core photonic crystal fiber (GRC-PCF) and its general design strategy by the finite element method (FEM). In addition, the numerical results turn out that the GRC-PCF is better than conventional step-index ring-core-photonic crystal fiber (SRCPCF) in terms of mode purity and mode quality, when the two fibers support the same numbers of OAM modes at 1.55 mu m, respectively. After optimizing structural parameters, a GRC-PCF that can support 14 OAM modes without phase distortion and high-radial modes in C+L bands is designed. Particularly, the mode purity and mode quality of all the OAM modes are higher than 97.05% and 98.42%, respectively. The confinement losses are maintained at the order of 10(-11) and flat dispersion. The proposed fiber can be used in the MDM system and realize the stable transmission of the OAM modes.
NSTL
Elsevier
