Abstract
In this paper, a unique semiconductor-doped glass photonic crystal fiber has been designed, which is suitable for soliton propagation at femto-Joule energy. The fiber promises to yield low and uniform anomalous dispersion profile and very large optical nonlinearities $\text{25 211 W}^{ - 1} {\text{km}}^{ - 1}$ at telecommunication wavelength, and, thus, facilitating soliton formation at ultralow energy. The observed magnitude of nonlinearity is the highest reported ever till date in AlGaAs-doped glass. The soliton dynamics has been investigated taking into account of higher order dispersions and nonlinearities. Propagating solitons breadth and experience large frequency shift, this decrease with the increase in the initial pulse width and increase with the increase in pulse energy. Temporal width of solitons oscillates, the frequency and amplitude of oscillations increase with the increase in the value of pulse energy.
Highlights
Optical solitons in photonic crystal fibers (PCF) open new opportunities, which find applications in telecommunications, sensing technologies, supercontinuum and bio-photonics [1]–[10]
In order to examine the effect of pulse duration on the pulse dynamics, we have extended our investigation for three different initial pulse widths
We have investigated the dynamics of soliton propagation inside the designed fiber considering the effect of fourth order dispersion, third and fifth order nonlinearities, intra-pulse Raman scattering and self-steepening
Summary
Optical solitons in photonic crystal fibers (PCF) open new opportunities, which find applications in telecommunications, sensing technologies, supercontinuum and bio-photonics [1]–[10]. Barviau et al [16] have investigated the enhanced soliton self-frequency shift and continuous wave supercontinuum generation in GeO2 doped index guiding PCFs. Hickmann et al [21] have investigated the effects of fifth order nonlinearity on optical pulse propagation in semiconductor doped glass fibers. Aitchison et al [25] have experimentally reported the values of nonlinear optical coefficients of AlGaAs in the half-band-gap spectral region They have studied the polarization effect on XPM and SPM from band structure calculation. The combination of extremely large nonlinearity and low anomalous dispersion shall inevitably make propagation dynamics of optical solitons interesting in Al0.24Ga0.76As doped PCFs. The organization of the paper is as follows: In Section 2, we have designed and studied the optical properties of the fiber.
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