Abstract
In this paper, a dual guided modes ring-based photonic crystal fiber (PCF) is designed in which two channels occupying different spatial positions are independent of each other and support up to 170 + 62 orbital angular momentum (OAM) modes in the dual guided modes regions. The designed PCF consists of a large central air hole, two high refractive index rings based on Schott glass (BAK1) and cladding. The characteristics of the designed PCF are analyzed by finite element method (FEM). The results show that the proposed PCF has a sufficiently large effective refractive index difference, relatively flat dispersion, large effective mode field area and low nonlinear effects with the wavelength range from 1.45 to 1.75 μm. The energy of the light field is mainly confined to two high refractive index rings with good isolation parameters. The values of most OAM modes purity in dual guided modes regions are greater than 0.9 and the mode quality of all eigenmodes is higher than 0.93 without phase distortion over the azimuth angle. Moreover, the confinement loss of all eigenmodes are below 1.4 × 10–8 dB m−1 where the lowest value is 1.56 × 10–12 dB m−1 at λ = 1.55 μm for HE13,1 mode. The proposed PCF has a large effective mode field area, up to 316.99 μm2. The nonlinear coefficient of HE and EH modes are less than 0.55 km−1 W−1 in the outer ring and less than 1.5 km−1 W−1 in the inner ring. In conclusion, the dual guided modes ring-based photonic crystal fiber has potential applications in large capacity data transmission in optical communications.
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Acknowledgements
This work is supported by National Natural Science Foundation of China (Grant no. 61774062 and no. 11674109). The Science and Technology Planning Project of Guangdong Province, China (Grant no. 2017A020219007). Project of Department of Education of Guangdong Province, China (no. 2019KTSCX257).
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Yang, M., Liu, W., Song, Y. et al. A design of dual guided modes ring-based photonic crystal fiber supporting 170 + 62 OAM modes with large effective mode field area. Appl. Phys. B 128, 38 (2022). https://doi.org/10.1007/s00340-022-07761-7
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DOI: https://doi.org/10.1007/s00340-022-07761-7