Nonlinear directional coupler with variable coupling coefficient and variable nonlinear refractive index coefficient

Liang, Binming; Li, Qu; Liu, Gangjun; Jin, Guoliang

doi:10.1016/j.optcom.2004.11.073

Cited by 5 publications

(6 citation statements)

References 8 publications

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“…The notion of inhomogeneous nonlinearity is emerging as a distinct route for making alloptical devices such as switches, logic gates, and other signal processing devices [27][28][29][30][31][32][33][34][35]. As the name implies, the term inhomogeneous nonlinearity refers to the variation in the nonlinearity ( ) as a function of propagation coordinate .…”

Section: Introductionmentioning

confidence: 99%

“…Compared to the conventional FBG devices with the homogeneous nonlinearities [27], gratings with varying nonlinear profiles switch at higher or lower critical intensities depending on the profile used and the value of the inhomogeneous nonlinearity parameter ( ( )). Different kinds of nonlinear profiles exist in the form of linear, Gaussian, exponential, logarithmic, and so forth [28,29,31,34,35]. Judicious selection of the nonlinearity profile and manipulation of the inhomogeneous nonlinearity parameter are necessary for acquiring low-power AOS.…”

Section: Introductionmentioning

confidence: 99%

“…The same material with a wide range of nonlinear coefficients can be manufactured by varying the doping levels. It is possible to produce a fiber with an inhomogeneous nonlinear profile by suitably controlling the thickness, the density of the dopant, or dopant diffusion time [28,29,31,34,35]. Controlling of these parameters independently produces inhomogeneity in the linear RI profile ( 0 ).…”

Section: Introductionmentioning

confidence: 99%

“…(1), it is clear that the material should have high/low linear RI, large (small) bond length, or small (large) Sellmeier gap, to exhibit large (small) value of nonlinear coefficient ( 2 ). Thus, it is possible to fabricate fiber that support inhomogeneous nonlinearity via variable metal doping [28,29,31,34,35].…”

Section: Introductionmentioning

confidence: 99%

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Inhomogeneous nonlinearity meets parity–time-symmetric Bragg structures: route to ultralow power steering and peculiar stable states

et al. 2022

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In the context of parity–time ( P T )-symmetric fiber Bragg gratings, tailoring the nonlinear profile along the propagation coordinate serves as a new direction for realizing low-power all-optical switches. The scheme is fruitful only when the nonlinearity profile will be either linearly decreasing or increasing form. If the rate of variation of the nonlinearity profile is high, the critical intensities fall below the input power of value 0.01 in the unbroken regime provided that the light launching direction is right. Nowadays, every new theoretical inception into the parity–time fiber Bragg grating (PTFBG) has started making sense of switching in the broken P T -symmetric regime, which was once believed to be the instability regime. When the inhomogeneous nonlinearity acts together with the broken P T symmetry and right light incidence, it leads to two peculiar settings. First, the switch-up intensities are ultralow. Second, the switch-down action takes place at zero critical intensities. Such optical bistability curves are unprecedented in the context of conventional gratings and found only in plasmonic devices and anti-directional couplers. Even though the nonlinearity is inhomogeneous, the ramp-like first stable states persist in the broken P T -symmetric regime, giving an additional indication that the broken PTFBG is closely associated with the plasmonic structures. In the existing PTFBG systems, the switching intensities are relatively higher in the broken regime. However, the proposed system records the lowest switching intensities in the broken regime. The reported intensities ( <Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Inhomogeneous nonlinearity meets parity–time-symmetric Bragg structures: route to ultralow power steering and peculiar stable states

et al. 2022

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confidence: 99%

Measurement Uncertainty Sources Analysis and Verification of Time-Grating with Variable Coupling Coefficient

Yang¹,

Fan²,

Zhou³

et al. 2015

AMM

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In order to improve the precision of Time-grating with Variable Coupling Coefficient, the electrical traveling wave equation was derived in detail base on the further study of working principle of Time-grating sensor. Combined with the processing and assembling methods of sensor, the uncertainty sources of sensor standing wave, synthesis traveling wave signal and the produce reasons of higher harmonic were analyzed by using uncertainty theory. The produce reasons of higher harmonic were verified with spectral analysis of the original sensor error data, and then the primary and secondary uncertainty sources affected the sensor measurement uncertainty sources were got, which were time and spatial orthogonal error, amplitude error of two roads signal and stator and rotor air gap uneven. The conclusion made in this paper can be used to conduct the structure optimal design, sensor error correction and uncertainty evaluation.

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MZ-MMI-based all-optical switch using nonlinear coupled waveguides

Bahrami

Rostami

Nazari

2011

Optik

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Nonlinear directional coupler with variable coupling coefficient and variable nonlinear refractive index coefficient

Cited by 5 publications

References 8 publications

Inhomogeneous nonlinearity meets parity–time-symmetric Bragg structures: route to ultralow power steering and peculiar stable states

Inhomogeneous nonlinearity meets parity–time-symmetric Bragg structures: route to ultralow power steering and peculiar stable states

Measurement Uncertainty Sources Analysis and Verification of Time-Grating with Variable Coupling Coefficient

MZ-MMI-based all-optical switch using nonlinear coupled waveguides

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