Guiding characteristics of sunflower-type fiber

• Published in: Superlattices and microstructures Vol. 115; pp. 123 - 129
• Main Authors: Liu, Exian, Yan, Bei, Tan, Wei, Xie, Jianlan, Ge, Rui, Liu, Jianjun
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.03.2018
• Subjects: Guiding characteristic; Rotational symmetry; Sunflower-type fiber; Sunflower-type fiber; Guiding characteristic; Rotational symmetry
• ISSN: 0749-6036; 1096-3677
• DOI: 10.1016/j.spmi.2018.01.014

In this paper, the guiding characteristics of sunflower-type fiber (SFF) with 6-fold rotational symmetry are investigated theoretically using finite element method (FEM). The behavior of single-mode propagation in SFF is verified. Numerical results reveal that, the cutoff ratio for endlessly single-mode propagation in SFF is 0.575 which is larger than that of photonic crystal fiber (PCF) and photonic quasi-crystal fiber (PQF). Moreover, SFF can present ultra-flattened near-zero chromatic dispersion, 0.249 ± 1.146 ps/nm/km, in a broadband of wavelength covering 1.20–1.84 μm over all the telecommunication wavelengths. In term of chromatic dispersion and confinement loss in the wavelength range from 1.00 to 2.00 μm, a comparison between SFF, PCF and PQF with same structure parameters is carried out. Importantly, the rotational symmetry, as a new manageable structure parameter beyond common air hole diameter and lattice constant, can be employed to manipulate the chromatic dispersion, confinement loss, effective mode area and non-linear coefficient and it dependences on these guiding characteristics are discussed in detail. •The cutoff ratio for endlessly single mode propagation in SFF is verified.•SFF exhibits an ultra-flattened near-zero dispersion in a broadband of wavelength from 1.20 to 1.84 μm.•A comparison between SFF, PCF and PQF is performed with respect to dispersion and confinement loss.•Manipulating rotational symmetry provides a new method of optimizing the performance of SFF.