POSTDOC, UNIVERSITY OF ROCHESTER
I am a postdoc working at the Institute of Optics at the University of Rochester under the supervision of Prof. Govind P. Agrawal. My job is to conduct theoretical and numerical investigations in the fields of nonlinear optics. Specifically, my research explores the interactions between nonlinear effects in fiber optics in order to develop new schemes for applications in the fields of telecommunications, optical metrology, and medical science, to mention a few examples. In particular, I'm investigating the nonlinear effects leading the generation of supercontinuum in active and in rare-earth doped optical fibers. The proposed schemes are significant from a practical standpoint because it is possible to achieve spectral broadening with low input power and without requiring modulation instability or soliton fission, as well as high spectral coherence, and the suppression of self-soliton frequency shift, to mention a few. The resulting special spectral characteristics are of many interests for a variety of unveiling applications. I have to highlight that my research involves mathematical modeling and the development of the simulation codes as well. All my research projects are destinated to be published in prestigious conferences and journals in the field of optics. I have attended the CLEO meeting the last May and I have an accepted talk to be presented at Frontiers in Optics next September. At FiO 2017 I will talk about the Raman shift suppression and fundamental soliton splitting in highly dependent nonlinear media. These effects are given by the doping of photonic crystal fibers with silver nanoparticles. In summary, my job is providing novel fundamental perspectives about solitons propagating and interactions between nonlinear effects in special fibers. It also points to potential applications because each input pulse undergoes rich evolution dynamics in these materials.
Abstract: We study numerically the formation of cascading solitons when femtosecond optical pulses are launched into a fiber amplifier with less energy than required to form a soliton of equal duration. As the pulse is amplified, cascaded fundamental solitons are created at different distances, without soliton fission, as each fundamental soliton moves outside the gain bandwidth through the Raman-induced spectral shifts. As a result, each input pulse creates multiple, temporally separated, ultrashort pulses of different wavelengths at the amplifier output. The number of pulses depends not only on the total gain of the amplifier but also on the width of input pulses.
Pub.: 30 Jun '16, Pinned: 20 Jul '17
Abstract: We present a numerical strategy to design fiber based dual pulse light sources exhibiting two predefined spectral peaks in the anomalous group velocity dispersion regime. The frequency conversion is based on the soliton fission and soliton self-frequency shift occurring during supercontinuum generation. The optimization process is carried out by a genetic algorithm that provides the optimum input pulse parameters: wavelength, temporal width and peak power. This algorithm is implemented in a Grid platform in order to take advantage of distributed computing. These results are useful for optical coherence tomography applications where bell-shaped pulses located in the second near-infrared window are needed.
Pub.: 04 Aug '14, Pinned: 20 Jul '17