Analysis of second-order gratings

Hardy, A.; Welch, David; Streifer, W.

doi:10.1109/3.35721

Cited by 105 publications

(27 citation statements)

References 14 publications

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“…An in-depth treatment of second-order gratings can be found in [15]. Because we use this grating as a coupler (first-order diffraction), we will use the term coupler grating instead of second-order grating in the rest of this paper.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…8(b)]. It is obvious that the spacing between the waveguide and the bottom reflector will be important [15], but fabrication tolerances are reasonable because we are using a wavelength of 1550 nm. Because of the large index contrast between GaAs and AlO , only two mirror pairs are needed and therefore we will use the term multilayer reflector instead of DBR.…”

Section: B Combined Coupler and Reflector Gratingmentioning

confidence: 99%

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An out-of-plane grating coupler for efficient butt-coupling between compact planar waveguides and single-mode fibers

Taillaert

Bogaerts

Bienstman

et al. 2002

IEEE J. Quantum Electron.

549

291

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Abstract-We have designed and fabricated an out-of-plane coupler for butt-coupling from fiber to compact planar waveguides. The coupler is based on a short second-order grating or photonic crystal, etched in a waveguide with a low-index oxide cladding. The coupler is optimized using mode expansion-based simulations. Simulations using a 2-D model show that up to 74% coupling efficiency between single-mode fiber and a 240-nm-thick GaAs-AlO waveguide is possible. We have measured 19% coupling efficiency on test structures.Index Terms-Integrated optics, optical planar waveguide components, waveguide coupler.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: B Combined Coupler and Reflector Gratingmentioning

confidence: 99%

An out-of-plane grating coupler for efficient butt-coupling between compact planar waveguides and single-mode fibers

Taillaert

Bogaerts

Bienstman

et al. 2002

IEEE J. Quantum Electron.

549

291

View full text Add to dashboard Cite

show abstract

“…The FDTD method can be used to tackle a large class of the problems and precisely solves the equations governing the device behavior, but at the cost of computational resources. Grating couplers of the finite dimensions were also investigated using a coupled-mode theory (Hardy et al 1989;Hoekstra 2000). The main constraint related to the coupled mode theory is that it will model only gratings of a modest refractive index contrast.…”

Section: Simulation Modelmentioning

confidence: 99%

Simulations of nanograting-assisted light coupling in GaN planar waveguide

et al. 2011

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The numerical simulations of nanogratings integrated with gallium nitride (GaN) planar waveguides as well as the experimental in-coupling results are presented. A simulation tool based on the eigenmode expansion method and advanced boundary conditions provided a rigorous model of 400-nm-period grating couplers. A full-vectorial Maxwell solver allowed performing a number of simulations with varying grating parameters, where coupling efficiency, reflection and transmission characteristics of device were calculated. Gratings with different etch depths and arbitrary shapes were simulated using a staircase approximation, with an optimized number of steps per single slope. For the first time, an impact of dry etch processing on GaN coupler efficiency was evaluated, due to the inclusion of the sloped sidewalls, with regard to the technological constrains. Finally, the experimental results in the visible spectrum region (λ = 633 nm), for 400-nm-deep gratings etched in GaN waveguide, Electronic supplementary material The online version of this article

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“…As the presence of metal contact can reduce the power radiating into the air, part of the reflected power is coupled back into the guided modes again after interact with the grating. Hardy [9] has given a comprehensive study of the effects of a substrate reflector located under a 2 nd -order distributed Bragg reflector. Reflection, transmission, radiation, and absorption variations with substrate reflectivity and its phase, duty cycle, tooth shapes and heights, waveguide loss, and detuning were included in his research.…”

Section: Introductionmentioning

confidence: 99%

Effect of metal contact's reflection on the effective coupling coefficient of second‐order DFB laser diodes

Zhong

Zhu

Song

et al. 2004

Micro & Optical Tech Letters

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For a second‐order DFB‐LD, the presence of a metal contact layer can reduce 1st‐order radiation. Part of the reflected power is redistributed into guided modes and results in a variation of the effective coupling coefficient κeff. In this paper, we study the effect of the Au top contact's reflection on the κeff of 2nd‐order DFB lasers. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 42: 339–342, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20296

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Analysis of second-order gratings

Cited by 105 publications

References 14 publications

An out-of-plane grating coupler for efficient butt-coupling between compact planar waveguides and single-mode fibers

An out-of-plane grating coupler for efficient butt-coupling between compact planar waveguides and single-mode fibers

Simulations of nanograting-assisted light coupling in GaN planar waveguide

Effect of metal contact's reflection on the effective coupling coefficient of second‐order DFB laser diodes

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