Periodically segmented waveguides in Ti:LiNbO_3

Nir, D.; Weissman, Z.; Ruschin, S.; Hardy, A.

doi:10.1364/ol.19.001732

Cited by 34 publications

(12 citation statements)

References 10 publications

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“…Substantial research has been done previously on segmented waveguides in low-index-contrast, large-mode-volume geometries. [3][4][5] The SOI geometry that we use in this study was chosen to have low waveguide loss and relatively large field concentrations outside the core of the waveguide. It consists of 120 nm of silicon (index 3.5) atop a 1.4 m layer of silicon dioxide (index 1.43), which rests on the silicon handle.…”

Section: Introductionmentioning

confidence: 99%

Segmented waveguides in thin silicon-on-insulator

et al. 2005

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We have developed new silicon-on-insulator waveguide designs for simultaneously achieving both low-loss optical confinement and electrical contacts, and we present a design methodology based on calculating the Bloch modes of such segmented waveguides. With this formalism, waveguides are designed in a single thin layer of silicon-on-insulator to achieve both optical confinement and minimal insertion loss. Waveguides were also fabricated and tested, and the measured data were found to closely agree with theoretical predictions, demonstrating input insertion loss and propagation loss better than 0.1 dB and −16 dB/ cm, respectively.

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Section: Introductionmentioning

confidence: 99%

Segmented waveguides in thin silicon-on-insulator

et al. 2005

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“…A lot of them agree with a simplified description which consists in considering the periodic segmented waveguide as an equivalent one with an homogeneous core, but with a lower refractive index variation between the equivalent core and the cladding [1][2][3][4] waveguide has a duty cycle η and an index difference ∆n = n 1 − n 0 , it has similar propagation characteristics of a waveguide having a core of refractive index n eq , given by:…”

Section: Introductionmentioning

confidence: 74%

Periodically segmented waveguides made by ion-exchange in glass: application to a TE-pass polarizer and to an asymmetric Y-junction wavelength demultiplexer

Bucci

Grelin

Ghibaudo

et al. 2005

Integrated Optics: Devices, Materials, and Technologies IX

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In this paper, the realization and characterization of periodic segmented waveguides made by ion-exchange on glass is presented as well as their application to polarizers and wavelength duplexers. Segmented waveguides are of major interest for integrated devices because they allow tailoring the refractive index without changing the technological parameters. Indeed, a segmented waveguide, which is composed of a periodic succession of guiding and non-guiding zones, can be considered as a classical waveguide with a core refractive index that ranges from the segmented core to the substrate ones, depending on the segmentation ratio. Through this way, it is thus possible to avoid the use of more complex techniques that require a double-step lithography process.In the first part of the article, surface segmented waveguides made by ion-exchange on glass are studied and a linear relationship between the segmentation duty cycle and the maximum core refractive index of an equivalent continous waveguide is demonstrated. A simple correction on the duty cycle is needed to take into account the longitudinal diffusion.After a presentation of its principle of operation, in the second part of the article, we propose the realization and characterization by means of segmented waveguide of a polarizer with more than 30dB of extinction ratio at λ = 1550nm. Finally, the design and first results obtained on a duplexer based on an asymmetric segmented Y-junction are presented.

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“…1(a), is equivalent to a CWG of Fig. 1(b) with the same depth and same width but with refractive index given by [2], [3], [9]- [11] n eq = n clad + ηΔn (1) where n clad is the cladding index, η is the duty cycle, and Δn = n max − n clad , is the refractive index contrast. The advantage of using the 2D-FEM instead of BPM is that the former enables the modeling of the wave propagation in PSW structures as a scattering problem, and consequently, also takes into account back reflected waves.…”

Section: Methods Of Analysismentioning

confidence: 99%

“…The 3-D beam propagation method (3D-BPM) and the 3-D finite difference in time domain (3D-FDTD) are used in most of the theoretical studies to calculate the effective index and the mode profile of PSW [1]- [3], [9]- [14]. However, these techniques require very large computational effort and, for that reason, it has been necessary to significantly limit the longitudinal length of the structures that were simulated using those methods [1]- [3], [12].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Straight Periodic Segmented Waveguide Using the 2-D Finite Element Method

Rubio-Mercedes

Rodríguez-Esquerre

Lima

et al. 2014

J. Lightwave Technol.

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A numerical analysis of periodic segmented waveguides (PSWs) using the 2-D finite element method (2D-FEM) in the frequency domain is presented. This method has significantly lower computational cost when compared with 3-D methods that have been used to model PSWs, and can also model back reflected signals. Unlike photonic crystal waveguides, light confinement in a PSW is due to total internal reflection as in a continuous waveguide (CWG). We show that the dispersion relation of the guided modes in PSW is strongly influenced by the dielectric periodicity along the waveguide. We calculate the mode profile of a PSW in a region far away from the bandgap and we showed that it is comparable to the mode profile of the equivalent CWG even for relatively high values of averaged refractive index contrast.Index Terms-Continuum waveguide, equivalent index, finite element methods, mode profile, segmented waveguide.

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Periodically segmented waveguides in Ti:LiNbO_3

Cited by 34 publications

References 10 publications

Segmented waveguides in thin silicon-on-insulator

Segmented waveguides in thin silicon-on-insulator

Periodically segmented waveguides made by ion-exchange in glass: application to a TE-pass polarizer and to an asymmetric Y-junction wavelength demultiplexer

Analysis of Straight Periodic Segmented Waveguide Using the 2-D Finite Element Method

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