33 citations · 250 across the 26 of their papers we have counts for
26 papers
Modulational instability in -symmetric Bragg grating structures with four-wave mixing
I. Inbavalli, K. Tamilselvan, A. Govindarajan +2
We investigate the dynamics of modulational instability (MI) in -symmetric fiber Bragg gratings with a phenomenon of intermodulation known as four-wave mixing (FWM). Altho…
Unique multistable states in periodic structures with saturable nonlinearity
S. Vignesh Raja, A. Govindarajan, M. Lakshmanan
We report that conventional saturable periodic structures, in sharp contrast to the conventional systems with different nonlinearities which exhibit the typical S- shaped optical b…
Unique multistable states in periodic structures with saturable nonlinearity. II. Broken -symmetric regime
S. Vignesh Raja, A. Govindarajan, M. Lakshmanan
In this work, we observe that the -symmetric fiber Bragg gratings (PTFBGs) with saturable nonlinearity (SNL) exhibit ramp-like, mixed, optical multistability (OM) in…
Unique multistable states in periodic structures with saturable nonlinearity. I. Conventional case and unbroken -symmetric regime
S. Vignesh Raja, A. Govindarajan, M. Lakshmanan
In this work, we predict that periodic structures without gain and loss do not exhibit an S-shaped hysteresis curve in the presence of saturable nonlinearity (SNL). Instead, the in…
Modulational instability in -symmetric Bragg grating structures with saturable nonlinearity
K. Tamilselvan, A. Govindarajan, I. Inbavalli +2
We investigate the nontrivial characteristics of modulational instability (MI) in a system of Bragg gratings with saturable nonlinearity. We also introduce an equal amount of gain…
Inhomogeneous nonlinearity meets -symmetric Bragg structures: Route to ultra-low power steering and peculiar stable states
S. Sudhakar, S. Vignesh Raja, A. Govindarajan +2
In the context of -symmetric fiber Bragg gratings, tailoring the nonlinear profile along the propagation coordinate serves to be a new direction for realizing low-pow…
Stabilization of light bullets in nonlinear metamaterial waveguides
A. K. Shafeeque Ali, A. Govindarajan, M. Lakshmanan
In this paper, we carry out a theoretical investigation on the propagation of spatio-temporal solitons (light bullets) in the nonlinear metamaterial waveguides. Our theoretical stu…
Low-power optical bistability in -symmetric chirped Bragg gratings with four-wave mixing
S. Sudhakar, S. Vignesh Raja, A. Govindarajan +2
The central theme of this article is the analysis of the usefulness of introducing four-wave mixing or modulation of Kerr nonlinearity in a nonuniform grating structure with gain a…
Bistable soliton switching dynamics in a -symmetric coupler with saturable nonlinearity
Ambaresh Sahoo, Dipti Kanika Mahato, A. Govindarajan +1
We investigate the switching dynamics in a -symmetric fiber coupler composed of a saturable nonlinear material as the core. In such a saturable nonlinear medium, bist…
Switching dynamics of femtosecond solitons in parity-time-symmetric coupled optical waveguides
Ambaresh Sahoo, Dipti Kanika Mahato, A. Govindarajan +1
We report a detailed study on soliton steering dynamics in a parity-time-symmetric directional coupler in the femtosecond domain, which requires incorporation of higher-order pertu…
Polarization dynamics of ultrafast solitons
Avi Klein, Sara Meir, Hamootal Duadi +2
We study the polarization dynamics of ultrafast solitons in mode-locked fiber lasers. We find that when a stable soliton is generated, it's state-of-polarization shifts toward a st…
Dispersion Managed Generation of Peregrine Solitons and Kuznetsov-Ma Breather in an Optical Fiber
Dipti Kanika Mahato, A. Govindarajan, M. Lakshmanan +1
Optical rogue waves and its variants have been studied quite extensively in the context of optical fiber in recent years. It has been realized that dispersion management in optical…
-channel comb filtering and lasing in -symmetric superstructures
S. Vignesh Raja, A. Govindarajan, A. Mahalingam +1
A comb spectrum generating device based on Bragg grating superstructures with gain and loss is suggested in this paper. It includes a comprehensive analysis of the device formulati…
Modulational instability in non-Kerr photonic Lieb lattice with metamaterials
A. K. Shafeeque Ali, Andrei I. Maimistov, K. Porsezian +2
We present an analysis of modulational instability of diffractionless waves in a face-centered square lattice of waveguides featuring non-Kerr nonlinearity, which are constituted b…
Reviving Modulational Instability with Third-Order Dispersion
K. Tamilselvan, A. Govindarajan, T. Kanna +2
It is well-known that third-order dispersion (TOD) never allows the continuous wave of any nonlinear Schroedinger (NLS) type system to experience modulational instability (MI). Rem…
On the integrability aspects of nonparaxial nonlinear Schrödinger equation and the dynamics of solitary waves
K. Tamilselvan, T. Kanna, A. Govindarajan
The integrability nature of a nonparaxial nonlinear Schrödinger (NNLS) equation, describing the propagation of ultra-broad nonparaxial beams in a planar optical waveguide, is studi…
Phase shifted -symmetric periodic structures
S. Vignesh Raja, A. Govindarajan, A. Mahalingam +1
We report the spectral features of a phase-shifted parity and time ()-symmetric fiber Bragg grating (PPTFBG) and demonstrate its functionality as a demultiplexer in t…
Tunable nonlinear spectra of anti-directional couplers
A. Govindarajan, Boris A. Malomed, M. Lakshmanan
We produce transmission and reflection spectra of the anti-directional coupler (ADC) composed of linearly-coupled positive- and negative-refractive-index arms, with intrinsic Kerr…
Tailoring inhomogeneous -symmetric fiber Bragg grating spectra
S. Vignesh Raja, A. Govindarajan, A. Mahalingam +1
The unique spectral behavior exhibited by a class of non-uniform Bragg periodic structures, namely chirped and apodized fiber Bragg gratings (FBGs) influenced by parity and time re…
Non-Lagrangian approach for coupled complex Ginzburg-Landau systems with higher order-dispersion
Roger Bertin Djob, Aurelien Kenfact-Jiotsa, A. Govindarajan
It is known that after a particular distance of evolution in fiber lasers, two (input) asymmetric soliton like pulses emerge as two (output) symmetric pulses having same and consta…
Nonlinear nonuniform -symmetric Bragg grating structures
S. Vignesh Raja, A. Govindarajan, A. Mahalingam +1
We explore the consequences of incorporating parity and time reversal () symmetries on the dynamics of nonreciprocal light propagation exhibited by a class of nonunif…
Multifaceted dynamics and gap solitons in -symmetric periodic structures
S. Vignesh Raja, A. Govindarajan, A. Mahalingam +1
We report the role of -symmetry in switching characteristics of a highly nonlinear fiber Bragg grating (FBG) with cubic-quintic-septic nonlinearities. We demonstrate…
Nonlinear anti-directional couplers with gain and loss
A. Govindarajan, Boris A. Malomed, M. Lakshmanan
Following the concept of -symmetric couplers, we propose a linearly coupled system of nonlinear waveguides, made of positive- and negative-index materials, which carr…
Cubic-quintic nonlinear Helmholtz equation: Modulational instability, chirped elliptic and solitary waves
K. Tamilselvan, T. Kanna, A. Govindarajan
We study the formation and propagation of chirped elliptic and solitary waves in cubic-quintic nonlinear Helmholtz (CQNLH) equation. This system describes nonparaxial pulse propaga…