All-optical ternary signal processing using uniform nonlinear chalcogenide fiber Bragg gratings

Yousefi, Elham; Hatami, Mohsen; Jahromi, Amin Torabi

doi:10.1364/josab.32.001471

Cited by 18 publications

(11 citation statements)

References 18 publications

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“…To start with, we consider a non-uniform FBG with length (L) and grating period (Λ) inscribed into a chirped chalcogenide fiber. The complex refractive index distribution profile that describes such a system is mathematically written as [2,50,51]…”

Section: Modelmentioning

confidence: 99%

Nonlinear nonuniform $\mathcal{PT}$-symmetric Bragg grating structures

Raja,

Govindarajan,

Mahalingam

et al. 2019

Preprint

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Section: Modelmentioning

confidence: 99%

Nonlinear nonuniform $\mathcal{PT}$-symmetric Bragg grating structures

Raja,

Govindarajan,

Mahalingam

et al. 2019

Preprint

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“…As it is discussed in [2,5,17], we perform these calculations from the end of the FBG to its beginning using boundary conditions of …”

Section: By Applyingmentioning

confidence: 99%

“…Because of growing fiber Bragg grating (FBG) applications in optical communication systems [1][2][3] and optical fiber sensors [4], they will play a crucial role in future all-optical communication [5]. A considerable advantage of nonlinear FBGs is that they can be designed as all optical switches [6][7][8] and optical bistable devices [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Bistability in Nonlinear Chalcogenide Fiber Bragg Grating for All Optical Switch and Memory Applications

Yousefi

Hatami

Dehghani

2017

IJOP

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ABSTRACT-We solve the coupled mode equations governing the chalcogenide nonlinear fiber Bragg gratings (FBGs) numerically, and obtain the bistability characteristics. The characteristics of the chalcogenide nonlinear FBGs such as: switching threshold intensity, bistability interval and on-off switching ratio are studied. The effects of FBG length and its third order nonlinear refractive index on FBG characteristics are investigated. We obtain an interesting result that independent of the third order nonlinear refractive index; there exists an optimum FBG length of about 6 mm at which the on-off switching ratio becomes maximized. It is also found that by increasing the nonlinearity, the maximum value of on-off switching ratio decreases. The results of this paper can be mainly used for designing alloptical switches and memories.

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“…Fiber Bragg gratings (FBGs) are one of the inevitable building blocks in the modern-day architecture of an all-optical network [1][2][3]. In the pursuit of realizing an integrable all-optical and low-power FBG switch, researchers have come up with a lot of innovative design solutions [4][5][6][7]. Among the wide variety of schemes available, the idea of modulation of Kerr nonlinearity [8][9][10][11][12] stands out to be one of the important methodologies to produce low-power bistable optical switches [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Low-power optical bistability in $\mathcal{PT}$-symmetric chirped Bragg gratings with four-wave mixing

Sudhakar,

Raja,

Govindarajan

et al. 2022

Preprint

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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 and loss. To do so, we propose an inhomogeneous system in which the nonlinearity of the P T -symmetric grating is modulated. It is proven that the proposed scheme can be fruitful only if the nonlinearity and its associated modulation terms are assumed to be self-defocusing ones. In order to cut down the intensity required for the steering, the sign of chirping is taken to be negative and the wavelength of operating light is considered to be higher than the Bragg wavelength. Alongside these settings, launching the light from the rear end of the device dramatically reduces the critical intensity to a value of 0.015 (approximately) which must be the lowest switching intensity ever reported in the context of nonlinear P T -symmetric gratings. The ramplike stable states in the broken P T -symmetric regime prevail even in the company of modulation in the nonlinearity index for both of the light incident directions.

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All-optical ternary signal processing using uniform nonlinear chalcogenide fiber Bragg gratings

Cited by 18 publications

References 18 publications

Nonlinear nonuniform $\mathcal{PT}$-symmetric Bragg grating structures

Nonlinear nonuniform $\mathcal{PT}$-symmetric Bragg grating structures

Optimization of Bistability in Nonlinear Chalcogenide Fiber Bragg Grating for All Optical Switch and Memory Applications

Low-power optical bistability in $\mathcal{PT}$-symmetric chirped Bragg gratings with four-wave mixing

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