Abstract
In this paper, we design a novel type of photonic crystal fiber (PCF) with a kind of typical micro-structure in its innermost cladding area, which can totally transmit 26 orbital angular momentum modes (OAMs). Over a bandwidth of 300 nm from 1.5 to 1.8 μm, this new type PCF shows a great improvement in dispersion property when it is compared with the total internal reflection PCF for reference. Moreover, other mode properties are also calculated and listed in curves, including effective indices, confinement loss and nonlinear coefficient. And basing on the test results, we further ameliorate the micro-structure and cladding of previous PCF structure and propose two effective ways to reduce the dispersion and confinement loss respectively. One is to insert typical type of micro-structure; the other is to change the arrangement and size of air holes in the cladding area. We finally propose an optimized structure which can support 30 OAM modes with the application of the two ways. Results show the optimized structure performs very well and achieves great progress in terms of dispersion and confinement loss.
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Funding
This work was supported in part Natural Science Foundation of Jiangsu Province under Grants BK20161521 and BK20180742; Nanjing University of Posts and Telecommunications (NUPTSF) under Grants NY214002, and NY215002; Distinguished Professor Project of Jiangsu under Grant RK002STP14001; Six Talent Peaks Project in Jiangsu Province under Grant 2015-XCL-023.
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Wan, X., Wang, Z., Sun, B. et al. Low dispersion and confinement loss photonic crystal fiber for orbital angular momentum mode transmission. Opt Quant Electron 52, 289 (2020). https://doi.org/10.1007/s11082-020-02414-5
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DOI: https://doi.org/10.1007/s11082-020-02414-5