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Mid-infrared high birefringence As₂Se₃-based PCF with large nonlinearity and distinctive dispersion by using asymmetric elliptical air hole cladding

Zhanqiang Hui

Xi’an University of Posts and Telecommunications, Xi’an 710121, China

E-mail Address: zhanqianghui@xupt.edu.cn

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Min Yang

Xi’an University of Posts and Telecommunications, Xi’an 710121, China

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Youkun Zhang

Xi’an University of Posts and Telecommunications, Xi’an 710121, China

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, and

Meizhi Zhang

Xi’an University of Posts and Telecommunications, Xi’an 710121, China

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https://doi.org/10.1142/S0217984918500239Cited by:5 (Source: Crossref)

Abstract

A novel high birefringence As₂Se₃-based hexagonal lattice photonic crystal fiber (PCF) is proposed. In the structure, a central defect core and three kinds of elliptical air holes with different major axes length and ellipticity are introduced in the cladding. The finite difference time domain (FDTD) method with perfectly matched layer (PML) absorption boundary conditions are used to simulate the guided modes of the designed PCF. The properties of this PCF are investigated in detail including the birefringence, beat length, dispersion, nonlinearity and polarization mode dispersion in the 2–5 $μ m$ mid-infrared range. The results show that for the optimized structure parameters of $Λ = 1.6 μ m$ , $a = 0.4 μ m$ , $b = 0.1 μ m$ , $a_{1} = 0.6 μ m$ , $b_{1} = 0.04 μ m$ , $a_{2} = 0.8 μ m$ , $b_{2} = 0.06 μ m$ , the high birefringence of 0.1192 and beat length of 41.93 $μ m$ are obtained. The maximum nonlinearity coefficient of 10,050 w $^{- 1}$ km $^{- 1}$ and 15,200 w $^{- 1}$ km $^{- 1}$ for x- and y-polarization modes are achieved. The distinctive dispersion is analyzed, which is all-normal in x-polarization direction while it has two zero dispersion points at 3.18 $μ m$ and 3.65 $μ m$ in y-polarization direction. The designed PCF with high birefringence, large nonlinearity and distinctive dispersion will be beneficial for mid-infrared fiber sensing, mid-infrared spectroscopy and nonlinear optics applications.

Keywords:

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