Abstract
A photonic crystal fiber (PCF) structure with a ring-core and 5 well-ordered semiellipse air-holes has been creatively proposed. Through a comparison between the structures with a high refractive index (RI) ring-core and the structure without, it conclude that a PCF with a high RI ring-core can work better. Schott SF57 was elected as the substrate material of ring-core. This paper compares the effects of long-axis and short-axis changes on the PCF and selects the optimal solution. Especially TE0,1 mode’s dispersion is maintained between 0 and 3 ps / (nm · km) ranging from 1.45 μm to 1.65 μm. This property can be used to generate a supercontinuum with 200 μm long zero dispersion wavelength (ZDM). In addition, Δneff reaches up to 10−3, which enables the near -degeneracy of the eigenmodes to be almost neglected. The proposed PCF structure will have great application value in the field of optical communications.
Highlights
Orbital angular momentum (OAM) beams have attracted great attention [1,2,3,4,5,6,7,8,9] since Allen et al experimentally verified their existence in 1992 [1]
As one of the most fundamental physical quantities in classical and quantum electrodynamics, OAM beams have been applied in many fields, such as optical communications [4], quantum information processing [5], and optical manipulation [6, 7]
We described a semielliptical photonic crystal fiber (PCF) structure with a high refractive index (RI) ring-core between a central air hole and cladding in more detail
Summary
Orbital angular momentum (OAM) beams have attracted great attention [1,2,3,4,5,6,7,8,9] since Allen et al experimentally verified their existence in 1992 [1]. A Photonic crystal fiber with large effective refractive index separation and low dispersion the transmission capacity, many effective technical measures in different dimensions have been proposed, such as mode division multiplexing [15,16,17], space division multiplexing [18], time division multiplexing [19] and wavelength division multiplexing [20]. The number of OAM modes can be changed with the air holes. We described a semielliptical PCF structure with a high RI ring-core between a central air hole and cladding in more detail. We used a material in ring core with a high refractive index in the PCF structure shown in Fig 1 and further analyzed the performance of the proposed structure in detail. PML is used as an absorbing boundary condition, and it is efficacious in preventing distortion of the electromagnetic field in the inner space of the PCF
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