Spectral characteristics of coupled-waveguide Bragg-reflection tunable optical filter

Weber, J.-P.

doi:10.1049/ip-j.1993.0045

Cited by 29 publications

(22 citation statements)

References 1 publication

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“…For the above relation between the two forward-and backward-propagating modes, we can consider that the grating is excited from both the right and left side as in [16], and the spectral response is obtained as shown in Fig. 2.…”

Section: Results Of Simulationmentioning

confidence: 99%

“…The widely established approach for the simulation of waveguide devices and grating assisted coupled waveguide devices is the coupled mode theory (CMT), which combines a deep insight into the problem together with a much greater computational simplicity than other numerical methods such as Finite Difference (FD), Finite Element (FE), and Beam Propagation Methods (BPM). There are a number of different coupled mode formulations which have been developed from the early 1980s until today [13][14][15][16][17][18][19][20][21]. There are two main representative formulations, the orthogonal CMT and rigorous non-orthogonal CMT.…”

Section: Introductionmentioning

confidence: 99%

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A Complete Analytical Analysis and Modeling of Few Mode Non-Uniform Fiber Bragg Grating Assisted Sensing Waveguide Devices

Raghuwanshi¹,

Panda²

2014

PIER M

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Abstract-In this paper, we develop and present a complete analytical method to analyze the spectral response of a non-uniform multimode fiber Bragg grating assisted devices supporting a few modes. We present the analytical solution while taking into account the two forward and two backward propagating even or odd normal modes of the grating using the matrix method of multimode coupled grating assisted coupler, for sensing application. Earlier, these types of numerical technique based analysis were presented by other researchers, but no one seems to present a complete analytical solution for the given case. The present analytical analysis can simulate a single mode to multimode coupled sensing waveguide devices based on non-uniform grating assisted operation in a coupled structure. The potential applications of our findings will be mostly in sensing devices.

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Section: Results Of Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Complete Analytical Analysis and Modeling of Few Mode Non-Uniform Fiber Bragg Grating Assisted Sensing Waveguide Devices

Raghuwanshi¹,

Panda²

2014

PIER M

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“…where the relative permittivity, r ε , is independent of the grating length while the perturbation in the relative dielectric permittivity, r ε Δ , is a periodic function of z and can be expanded by Fourier series [19]: considered to obtain the coupled equations [20]. CMT can be applied for orthogonal modes [19].…”

Section: Theorymentioning

confidence: 99%

“…CMT can be applied for orthogonal modes [19]. The orthogonality relation is represented by the following equation [19]:…”

Section: Theorymentioning

confidence: 99%

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The Effects of Various Apodization Functions on the Filtering Characteristics of the Grating-Assisted SOI Strip Waveguides

Karimi¹,

Emami²,

Nozhat³

2014

Journal of the Optical Society of Korea

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In this paper, four apodization functions are proposed for silicon-on-insulator (SOI) strip waveguides with sidewall-corrugated gratings. The effects of apodization functions on the full width at half maximum (FWHM), the side-lobe level, and the reflectivity of the reflection spectrum are studied using the coupled-mode theory (CMT) and the transfer-matrix method (TMM). The results show that applying proposed apodization functions creates very good filtering characteristics. Among investigated apodized waveguides, the apodization functions of Polynomial and z-power have the best performance in reducing side-lobes, where the side-lobe oscillations are entirely removed. Four functions are also used for precise adjustment of the bandwidth. Simulation results show that the minimum and maximum values of the FWHM are 0.74 nm and 8.48 nm respectively. In some investigated functions, changing the apodization parameters decreases the reflectivity which is compensated by increasing the grating length.

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A Surface Plasmon Resonance Study of Volume Phase Transitions in N-Isopropylacrylamide Gel Films

et al. 2002

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Cross-linked N-isopropylacrylamide (NIPAAm) gel is covalently attached to a substrate, and the resulting interface is probed using surface plasmon resonance (SPR) as a function of hydrostatic pressure and temperature. SPR provides a direct measurement of the local refractive index, which changes with the swelling ratio of the gel film. Similar to bulk NIPAAm gel, the transition temperature increases and the volume phase transition becomes broader as pressure increases. The width of the transition ranges from less than 0.5 °C at 1 bar to as much as 10 °C at 1000 bar, and the transition temperature increases by as much as 7 °C over the same range of pressures. However, the presence of a fixed substrate effectively confines the volume phase transition near the interface to one dimension, perpendicular to the substrate. This has significant effects on the transition temperature, particularly at high cross-linking density and high concentration of an ionizable comonomer. Furthermore, the swelling effect of the ionic groups is reduced, and the water content of the swollen gel does not change with increased ionic content. While the volume phase transition of the corresponding bulk gels can have a total volume change as large as 100-fold, the gel films have a total volume change around 15-fold.

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Spectral characteristics of coupled-waveguide Bragg-reflection tunable optical filter

Cited by 29 publications

References 1 publication

A Complete Analytical Analysis and Modeling of Few Mode Non-Uniform Fiber Bragg Grating Assisted Sensing Waveguide Devices

A Complete Analytical Analysis and Modeling of Few Mode Non-Uniform Fiber Bragg Grating Assisted Sensing Waveguide Devices

The Effects of Various Apodization Functions on the Filtering Characteristics of the Grating-Assisted SOI Strip Waveguides

A Surface Plasmon Resonance Study of Volume Phase Transitions in N-Isopropylacrylamide Gel Films

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