Dispersion Engineering of Highly Nonlinear Chalcogenide Suspended-Core Fibers

Abstract

Chalcogenide optical fibers are currently undergoing intensive investigation with the aim of exploiting the excellent glass transmission and nonlinear characteristics in the near-and mid-infrared for several applications. Further enhancement of these properties can be obtained, for a particular application, with optical fibers specifically designed that are capable of providing low effective area together with a properly tailored dispersion, matching the characteristics of the laser sources used to excite nonlinear effects. Suspended-core photonic crystal fibers are ideal candidates for nonlinear applications, providing small-core waveguides with large index contrast and tunable dispersion. In this paper, the dispersion properties of As 2 S 3 suspended-core fibers are numerically analyzed, taking into account, for the first time, all the structural parameters, including the size and the number of the glass bridges. The results show that a proper design of the cladding struts can be exploited to significantly change the fiber properties, altering the maximum value of the dispersion parameter and shifting the zero-dispersion wavelengths over a range of 400 nm.

Arsenic Sulfide Suspended-core Fiber Simulation with Three Parabolic Air Holes for Supercontinuum Generation

“…When parameter a increases, the top of the air holes becomes narrow, which can make the core smaller. The suspension core is measured by a circle, whose diameter is parameter d [28]. The diameter d determines the size of the suspension core, and it is varied to be 1, 3, 5 and 9 µm.…”

Numerical investigation on broadband mid-infrared supercontinuum generation in chalcogenide suspended-core fibers

“…[47] A full-vector modal solver based on the finite-element method [48] is applied to calculate the SCF fundamental mode in the wavelength range of interest. Dispersion engineering guidelines obtained with a previous analysis on the dispersion properties of As 2 S 3 SCFs with three, five, and six bridges [49] are exploited to design nonlinear chalcogenide fibers suitable for SC generation in the mid-IR. In particular, the core diameter and the bridge thickness of SCFs made of both As 2 S 3 and As 2 Se 3 , are properly chosen to obtain a ZDW around the wavelengths of 1.5 µm, 2 µm, and 2.8 µm, which can be considered for efficiently pumping the SC generation.…”

Coherent mid-infrared supercontinuum generation with As2Se3 photonic crystal fiber and femtosecond Airy pulses

“…SC generation in optical fiber is a reliable and economical way to achieve a broadband MIR light source [5][6][7][8][9][10][11][12][13]. Several microstructured chalcogenide fibers, such as suspended-core fibers, have been proposed to effectively tailor the dispersion and nonlinearity and demonstrated the SC generation up to 4 μm [11][12][13].…”

“…SC generation in optical fiber is a reliable and economical way to achieve a broadband MIR light source [5][6][7][8][9][10][11][12][13]. Several microstructured chalcogenide fibers, such as suspended-core fibers, have been proposed to effectively tailor the dispersion and nonlinearity and demonstrated the SC generation up to 4 μm [11][12][13]. Furthermore, it has been proposed to generate a hyper-broadband from ~2 μm to ~10 μm with a remarkably high spectral flatness by using a subharmonic generation source of the mode-locked thulium-doped fiber laser at 4.1 μm and an As 2 Se 3 PCF [5].…”

“…In the most of previous studies, SC generation has been demonstrated by utilizing Gaussian or hyperbolic secant pulses, which offer limited freedoms for the optimization of SC generation via pulse shaping [1,[5][6][7][8][9][10][11][12][13][14][15][16][17][18]. It has been shown before that the input pulse modulation and pre-chirp can be used to actively control the resulting spectral and temporal Coherent mid-infrared supercontinuum generation with As 2 Se 3 photonic crystal fiber and femtosecond Airy pulses profiles of generated SCs [19][20][21].…”