Multistability and switching in oppositely-directed saturated coupler

Nithyanandan, K.; Ali, Asghar; Porsezian, K.; Nishad, M.P.M.; Dinda, P. Tchofo; Grelu, Philippe

doi:10.1016/j.optcom.2018.01.055

Cited by 8 publications

(2 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More recently, MI has been studied for two-core couplers both theoretically and numerically based on modified nonlinear Schrödinger equations [18][19][20][21][22][23][24]. We also observe the use of the saturable nonlinear term in the study of MI properties in two-core couplers [25][26][27][28][29]. One of the main objectives of this report is to identify whether a PIM-NIM system with a suitable combination of nonlinearities will help modify the instabilities.…”

Section: Introductionmentioning

confidence: 99%

Saturable higher nonlinearity effects on the modulational instabilities in three-core triangular configuration couplers

Mohanraj

Sivakumar

2021

J. Opt.

View full text Add to dashboard Cite

This paper demonstrates the possibility to observe the modulational instability (MI) regions due to modified nonlinear saturability over and above other high-order nonlinearities for the triangular configuration of a three-core oppositely directed coupler. In this configuration, two channels are positive-refractive-index material, and one is a negative-index material. The governing equations are the modified coupled nonlinear Schrödinger equations, to which we add the higher-order nonlinearity terms and coupling terms. This equation is further modified with the saturable nonlinearity term. In the presence of several nonlinearities, we derive the dispersion relation for the optical coupler under consideration. We use a linear stability analysis to study the modulation stability characteristic gain in both the normal and anomalous group-velocity dispersion regimes. We have widely varied the parameter range of the physical system parameters to accommodate different possibilities. In the normal region, the saturable nonlinearity aids in increasing the bandwidth of the MI region, while in the anomalous regime, the bandwidth reduces. In the normal dispersion case, the simultaneous presence of all nonlinearities in the optical coupler does not provide a suitable scope for pulse propagation. On the other hand, in the anomalous regime, these nonlinearities favor for pulse propagation.

show abstract

Section: Introductionmentioning

confidence: 99%

Saturable higher nonlinearity effects on the modulational instabilities in three-core triangular configuration couplers

Mohanraj

Sivakumar

2021

J. Opt.

View full text Add to dashboard Cite

show abstract

“…We have also studied the effects of the detuning parameter in Eqs. (1) and ( 2), δ, on the bistability, which was neglected in previous works [34,[41][42][43][44], which solely addressed phasematched ADC. Figure 5(a) displays how δ affects the inputoutput curves in the system with equal gain and loss, χ 1 = χ 2 .…”

mentioning

confidence: 99%

Nonlinear anti-directional couplers with gain and loss

2019

View full text Add to dashboard Cite

Following the concept of P T -symmetric couplers, we propose a linearly coupled system of nonlinear waveguides, made of positive-and negative-index materials, which carry, respectively, gain and loss. We report novel bi-and multi-stability states pertaining to transmitted and reflective intensities, which are controlled by the ratio of the gain and loss coefficients, and phase mismatch between the waveguides. These states offer transmission regimes with extremely low threshold intensities for transitions between coexisting states, and very large amplification ratio between the input and output intensities leading to an efficient way of controlling light with light.

show abstract