Govind P. Agrawal
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View article: Dual-pumping supercontinuum generation and temporal reflection in a nonlinear photonic integrated circuit
Dual-pumping supercontinuum generation and temporal reflection in a nonlinear photonic integrated circuit Open
We report on what we believe is the first demonstration of on-chip supercontinuum generation through dual-wavelength pumping of a nonlinear photonic integrated circuit, fabricated from high-index doped silica glass. In addition to the band…
View article: Space–Time Duality in Optics: Its Origin and Applications
Space–Time Duality in Optics: Its Origin and Applications Open
The concept of space–time duality in optics was originally based on the mathematical connection between the diffraction of beams in space and the dispersion of pulses in time. This concept has been extended in recent years from the tempora…
View article: Dual-pumping supercontinuum generation and temporal reflection in a nonlinear photonic integrated circuit
Dual-pumping supercontinuum generation and temporal reflection in a nonlinear photonic integrated circuit Open
We report on the first demonstration of on-chip supercontinuum generation through dual-wavelength pumping of a nonlinear photonic integrated circuit, fabricated from high-index doped silica glass. In addition to the bandwidth enhancement t…
View article: Dual-pumping supercontinuum generation and temporal reflection in a nonlinear photonic integrated circuit
Dual-pumping supercontinuum generation and temporal reflection in a nonlinear photonic integrated circuit Open
We report on the first demonstration of on-chip supercontinuum generation through dual-wavelength pumping of a nonlinear photonic integrated circuit, fabricated from high-index doped silica glass. In addition to the bandwidth enhancement t…
View article: Intermodal all-optical pulse switching and frequency conversion using temporal reflection and refraction in multimode fibers
Intermodal all-optical pulse switching and frequency conversion using temporal reflection and refraction in multimode fibers Open
In this work, we extend temporal reflection and refraction analogies from the case of singlemode optical fibers to multimode fibers. Specifically, we show that nonlinear multimode fibers provide novel degrees of freedom that permit us to c…
View article: Propagation of optical pulses in a spatiotemporal dispersive medium
Propagation of optical pulses in a spatiotemporal dispersive medium Open
This review focuses on novel phenomena that emerge when optical pulses propagate through a spatiotemporal dispersive medium whose refractive index is modulated, both in space and time, in a traveling-wave fashion. Using optical fibers as a…
View article: Temporal Reflection from Ultrashort Solitons in Nonlinear Dispersive Medium: Impact of Raman Scattering
Temporal Reflection from Ultrashort Solitons in Nonlinear Dispersive Medium: Impact of Raman Scattering Open
This review focuses on phenomena such as temporal reflection, total internal reflection, and waveguiding from ultrashort solitons forming inside a nonlinear dispersive medium such as an optical fiber. The case of wider solitons, moving at …
View article: Modeling of Graded-Index Raman Fiber Amplifiers with Pump Depletion
Modeling of Graded-Index Raman Fiber Amplifiers with Pump Depletion Open
Graded-index (GRIN) fibers are often used for making high-power Raman amplifiers. We employ numerical and semi-analytical techniques to model such amplifiers and include not only the signal’s amplification and pump’s depletion but also var…
View article: Conservation law for electromagnetic fields in a space-time-varying medium and its implications
Conservation law for electromagnetic fields in a space-time-varying medium and its implications Open
We discuss the propagation of electromagnetic waves in a space-time modulated medium, for which neither energy nor momentum remains conserved. We have found a new conservation law when modulation moves at a constant speed v in a traveling-…
View article: Spatiotemporal Bragg gratings forming inside a nonlinear dispersive medium
Spatiotemporal Bragg gratings forming inside a nonlinear dispersive medium Open
We show that a spatiotemporal Bragg grating can be created inside a nonlinear dispersive medium (such as silica fibers) by launching a periodic train of pump pulses that travel as fundamental solitons. We develop a theoretical model and us…
View article: Modeling of High-Power Graded-Index Fiber Amplifiers
Modeling of High-Power Graded-Index Fiber Amplifiers Open
Graded-index fibers have been used in recent years to make high-power fiber lasers and amplifiers. Such fibers exhibit self-imaging, a phenomenon in which any optical beam periodically reproduces its original shape in undoped fibers (no ga…
View article: Temporal reflection from short pump pulses inside a dispersive nonlinear medium: the impact of pump parameters
Temporal reflection from short pump pulses inside a dispersive nonlinear medium: the impact of pump parameters Open
We have studied, through a series of experiments and numerical simulations, how temporal reflection from an intense pump pulse inside a photonic crystal fiber is affected by parameters of the pump pulse used to form a moving high-index bou…
View article: Theory of High-Efficiency Adiabatic Frequency Conversion in Coupled Microrings
Theory of High-Efficiency Adiabatic Frequency Conversion in Coupled Microrings Open
Adiabatic frequency conversion (AFC) in microring resonators is a promising alternative for integrated, tunable frequency shifting of optical signals. However, the efficiency of AFC in a single ring resonator is limited to below 80% for sy…
View article: Beam propagation in an active nonlinear graded-index fiber
Beam propagation in an active nonlinear graded-index fiber Open
A theoretical model is developed by exploiting the variational technique to investigate the evolution of an optical beam inside an optically pumped graded-index fiber amplifier. The variational analysis is a semi-analytical method that pro…
View article: Probing the decelerating trajectory of a Raman soliton using temporal reflection
Probing the decelerating trajectory of a Raman soliton using temporal reflection Open
Temporal reflection is a process where an optical pulse reflects off a moving boundary with different refractive indices across it. In a dispersive medium, this process creates a reflected pulse with a frequency shift that changes its spee…
View article: Experimental observation of a Raman-induced temporal waveguide
Experimental observation of a Raman-induced temporal waveguide Open
The formation of a Raman-induced temporal waveguide is demonstrated by launching short pump and probe pulses inside a photonic crystal fiber. The pump pulse creates a fundamental soliton whose speed changes continuously owing to its decele…
View article: Theory of High-Efficiency Adiabatic Frequency Conversion in Coupled Microrings
Theory of High-Efficiency Adiabatic Frequency Conversion in Coupled Microrings Open
Adiabatic frequency conversion (AFC) in microring resonators is a promising alternative for integrated, tunable frequency shifting of optical signals. However, the efficiency of AFC in a single ring resonator is limited to below 80% for sy…
View article: Raman-induced mode coupling in temporal waveguides formed by short solitons
Raman-induced mode coupling in temporal waveguides formed by short solitons Open
We study the propagation of optical pulses trapped inside a temporal waveguide formed by two solitons in a dispersive nonlinear medium such as an optical fiber. The solitons are short enough that they decelerate as their spectra shift cont…
View article: All-optical flip-flop and control methods thereof
All-optical flip-flop and control methods thereof Open
Embodiments of the invention pertain to remote optical control of holding beam-type, optical flip-flop devices, as well as to the devices themselves. All-optical SET and RE-SET control signals operate on a cw holding beam in a remote manne…
View article: Biodegradable concanavalin A functionalized polycaprolactone nanoparticle: A promising avenue for cancer therapy
Biodegradable concanavalin A functionalized polycaprolactone nanoparticle: A promising avenue for cancer therapy Open
S Objective: Receptor-based tumor-selective delivery of therapeutic efficacy and therapeutic index of cytotoxic drugs that exhibit dose-limiting toxicity is observed. Concanavalin A (Con A) was selected as the ligand for the proposed syste…
View article: Temporal reflection of an optical pulse from a short soliton: impact of Raman scattering
Temporal reflection of an optical pulse from a short soliton: impact of Raman scattering Open
We study temporal reflection of an optical pulse from the refractive-index barrier created by a short pump soliton inside a nonlinear dispersive medium such as an optical fiber. One feature is that the soliton’s speed changes continuously …
View article: Design of an X-cut thin-film lithium niobate waveguide as a passive polarization rotator
Design of an X-cut thin-film lithium niobate waveguide as a passive polarization rotator Open
The transverse-electric and transverse-magnetic modes of an X-cut thin-film lithium niobate waveguide vary in effective indices and exchange power when the waveguide makes an oblique angle with its crystallographic Z-axis, i.e. its optics …
View article: Propagation of Gaussian Schell-model beams in modulated graded-index media
Propagation of Gaussian Schell-model beams in modulated graded-index media Open
The evolution of partially coherent beams in longitudinally modulated graded-index media is studied. The special cases of Gaussian Schell-model beams and parametric modulation, when the modulation period is half the fiber self-imaging peri…
View article: 13. Fiber Optics and Optical Communications
13. Fiber Optics and Optical Communications Open
The advent of the Internet during the decade of 1990s impacted our society in unforeseen ways.Addiction to cell phones, social media dominated by Facebook and Twitter, video streaming by companies such as Netflix and Hulu, and on-line shop…
View article: Power optimization for phase quantization with SOAs using the gain extinction ratio
Power optimization for phase quantization with SOAs using the gain extinction ratio Open
Phase-sensitive amplifiers (PSAs) can work as M − level phase quantizers when waves generated with specific phase values are allowed to mix coherently in a nonlinear medium. The quality of an M − level phase quantizer depends on the relati…
View article: A Fourier processor for partially coherent fields
A Fourier processor for partially coherent fields Open
We extend conventional coherent Fourier processing techniques to a partially coherent field and modify its spatial coherence using a 4 f system. The coherence is measured by a modified Mach–Zehnder interferometer. Our results corroborate t…
View article: Correction to “Biomimetic Solid Lipid Nanoparticles for Oral Bioavailability Enhancement of Low Molecular Weight Heparin and Its Lipid Conjugates: <i>In Vitro</i> and <i>in Vivo</i> Evaluation”
Correction to “Biomimetic Solid Lipid Nanoparticles for Oral Bioavailability Enhancement of Low Molecular Weight Heparin and Its Lipid Conjugates: <i>In Vitro</i> and <i>in Vivo</i> Evaluation” Open
ADVERTISEMENT RETURN TO ISSUEPREVAddition and Correct...Addition and CorrectionNEXTORIGINAL ARTICLEThis notice is a correctionCorrection to "Biomimetic Solid Lipid Nanoparticles for Oral Bioavailability Enhancement of Low Molecular Weight …
View article: A POST-APPROVAL, OBSERVATIONAL STUDY TO ASSESS CLINICAL IMPACT OF GLYCOPYRRONIUM IN HIGH RISK COPD WITH FREQUENT EXACERBATIONS: POST HOC ANALYSES
A POST-APPROVAL, OBSERVATIONAL STUDY TO ASSESS CLINICAL IMPACT OF GLYCOPYRRONIUM IN HIGH RISK COPD WITH FREQUENT EXACERBATIONS: POST HOC ANALYSES Open
15Mar 2020 A POST-APPROVAL, OBSERVATIONAL STUDY TO ASSESS CLINICAL IMPACT OF GLYCOPYRRONIUM IN HIGH RISK COPD WITH FREQUENT EXACERBATIONS: POST HOC ANALYSES Agrawal G , Mahashur A. A. and Korukonda K. Sr. Consultant Pulmonologist, Jaypee H…