In this research, the influence of pulse width and energy on the nonlinear refractive index (n2) and nonlinear absorption (β) in Multiwalled carbon- nanotubes (MWCNTs) were experimentally studied. For this purpose, three different MWCNTs concentrations were used and were dispersed in a Polyvinyl alcohol (PVA) solution. We found a highly dependence of n2 and β with the MWCNTs concentration, optical intensity, and pulse width.
In this work, a fiber optic microphone system was built and tested. The purpose of the fiber microphone is to sense photoacoustic waves produced by water molecules excited by an ultrafast laser. The use of a fiber sensor allows for ease of three-dimension measurement implementation for a 3-D imaging based on water amounts of different materials, this sensor can be directly submerged in water or a phantom gel without electromagnetic interference nor corrosion.
The supercontinuum (SC) generation has found numerous applications in spectroscopy, pulse compression and design of tunable ultrafast femtosecond laser sources, some improvement has been done in many fields. Since carbon disulfide (CS2) has highly nonlinear characteristics, this makes it a good candidate for achieving an infrared broadband source. In this work, we implemented numerical simulations of propagating ultra-fast optical pulses through a photonic crystal fiber (PCF) with two infiltrated holes using CS2. Based on supermodes theory, we calculate dispersion and nonlinear parameters in order to study the SC generation characteristic of the infiltrated PCF.
Using a model for the shape of tapered fiber optics, we numerically study the effect of the taper shape profile on nonlinear optical pulse propagation. We show that super-Gaussian pulses can be generated and controlled and they are independent of higher-order nonlinearities, which makes them a good candidate for optical communications. We see that it is possible to compensate for the z variation of the dispersion with the nonlinear parameter and obtain the solutions of the homogeneous nonlinear Schroedinger equation.
In this paper, we present a procedure to compute analytically the acousto-optic coupling coefficient between the fundamental core mode and lower LP cladding modes in fiber optics. Based on the effect of the local bending, the variations in the refractive index are modelled. A set of equations and parameters are presented in order to compute and analyze the influence of acousto-optic effect in nonlinear pulse propagation.
We perform theoretical analysis of dispersive waves generated by soliton in birefringent photonic crystal fibers. With Lagrangian formulation and Stokes parameters, we study the state of polarization of solitons under various levels of birefringence and third order dispersion. Then we investigate numerically the variation of dispersive wave frequency for different initial polarization angles and further consider the effect of stimulated Raman scattering.
We show an analytical and numerical study of dispersive wave (DW) frequency generated by solitons in birefringent fiber optics. We propose some analytical approximations for finding the DW frequency that agrees with numerical results for small normalized third-order dispersion. We also show that a scalar DW frequency equation is not valid for all birefringent optical fiber cases.