Optical Multi-Stability in Fiber Bragg Gratings with Application to All-Optical Regeneration of Multi-Level Pulse-Amplitude-Modulation Signals

Zhou, Xingyu; Wu, Baojian; Wan, Qingyao; Wen, Feng; Qiu, Kun

doi:10.1364/acpc.2014.ath3a.119

Cited by 4 publications

(2 citation statements)

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“…Interpretation of these outcomes implies that when we include the higher order nonlinearities to the system without imposing any changes to the other parameters, multistable states are observed in its inputoutput characteristics. These multistable states can be employed in n level pulse amplitude modulation (PAM) scheme to improve the quality of reconstructed signal provided that the intensity of the regenerated signal is stationed in one of these stable states [50]. Compared to binary modulation scheme, PAM-4 offers two times larger transmission capacity.…”

Section: Combined Effects Of Cubic-quintic Nonlinearitiesmentioning

confidence: 99%

Multifaceted dynamics and gap solitons in $\mathcal{PT}$-symmetric periodic structures

Raja,

Govindarajan,

Mahalingam

et al. 2019

Preprint

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We report the role of PT -symmetry in switching characteristics of a highly nonlinear fiber Bragg grating (FBG) with cubic-quintic-septic nonlinearities. We demonstrate that the device shows novel bi-(multi-) stable states in the broken regime as a direct consequence of the shift in the photonic band gap influenced by both PT -symmetry and higher-order nonlinearities. We also numerically depict that such FBGs provide a productive test bed where the broken PT -symmetric regime can be exploited to set up all-optical applications such as binary switches, multi-level signal processing and optical computing. Unlike optical bistability (OB) in the traditional and unbroken PT -symmetric FBG, it exhibits many peculiar features such as flat-top stable states and ramp like input-output characteristics before the onset of OB phenomenon in the broken regime. The gain/loss parameter plays a dual role in controlling the switching intensities between the stable states which is facilitated by reversing the direction of light incidence. We also find that the gain/loss parameter tailors the formation of gap solitons pertaining to transmission resonances which clearly indicates that it can be employed to set up optical storage devices. Moreover, the interplay between gain/loss and higher order nonlinearities brings notable changes in the nonlinear reflection spectra of the system under constant pump powers. The influence of each control parameters on the switching operation is also presented in a nutshell to validate that FBG offers more degrees of freedom in controlling light with light.

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Section: Combined Effects Of Cubic-quintic Nonlinearitiesmentioning

confidence: 99%

Multifaceted dynamics and gap solitons in $\mathcal{PT}$-symmetric periodic structures

Raja,

Govindarajan,

Mahalingam

et al. 2019

Preprint

View full text Add to dashboard Cite

show abstract

“…Fiber Bragg gratings are regarded as one of the indispensable components in all-optical communication systems and sensor networks, see [1][2][3][4] and references therein. Numerous theoretical and experimental investigations were carried out in the past, in uniform [5] as well as nonuniform grating structures [6][7][8] to build efficient switches [9,10], regenarators [11], memory devices [12] and so on [13,14], based on the phenomena of optical bistability (OB) and multistability (OM).…”

Section: Introductionmentioning

confidence: 99%