Efficient Coupling into Polymer Waveguides by Gratings

Waldhäusl, R.; Schnabel, B.; Dannberg, Peter; Kley, Ernst‐Bernhard; Bräuer, Andreas; Karthe, W.

doi:10.1364/ao.36.009383

Cited by 146 publications

(68 citation statements)

References 11 publications

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“…One way to reduce the tapering footprint is by incorporating focusing gratings [32]. This approach involves curving the individual grating lines in order to achieve in-plane focusing of incident plain wavefront to a single spot.…”

Section: Focusing Gratingsmentioning

confidence: 99%

Grating-Assisted Fiber to Chip Coupling for SOI Photonic Circuits

2018

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Fiber to chip coupling is a critical aspect of any integrated photonic circuit. In terms of ease of fabrication as well as wafer-scale testability, surface grating couplers are by far the most preferred scheme of the coupling to integrated circuits. In the past decade, considerable effort has been made for designing efficient grating couplers on Silicon-on-Insulator (SOI) and other allied photonic platforms. Highly efficient grating couplers with sub-dB coupling performance have now been demonstrated. In this article, we review the recent advances made to develop grating coupler designs for a variety of applications on SOI platform. We begin with a basic overview of design methodology involving both shallow etched gratings and the emerging field of subwavelength gratings. The feasibility of reducing footprint by way of incorporating compact tapers is also explored. We also discuss novel grating designs like polarization diversity as well as dual band couplers. Lastly, a brief description of various packaging and wafer-scale testing schemes available for fiber-chip couplers is elaborated.

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Section: Focusing Gratingsmentioning

confidence: 99%

Grating-Assisted Fiber to Chip Coupling for SOI Photonic Circuits

2018

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“…This can be implemented as an adiabatic taper [7,22], but it requires comparatively long tapers, a few hundreds of micrometers in length. Alternatively, focusing grating couplers can be used, providing a high-efficiency short transition, with the length of a few tens of micrometers [2,17,39,40]. The grating trenches follow confocal ellipses in the chip plane [39], focusing the light onto a single-mode waveguide.…”

Section: Grating Coupler Layoutsmentioning

confidence: 99%

“…Alternatively, focusing grating couplers can be used, providing a high-efficiency short transition, with the length of a few tens of micrometers [2,17,39,40]. The grating trenches follow confocal ellipses in the chip plane [39], focusing the light onto a single-mode waveguide. The latter is connected with the focusing grating by either a short non-adiabatic taper or by a free-propagation slab waveguide region [40].…”

Section: Grating Coupler Layoutsmentioning

confidence: 99%

Single-etch subwavelength engineered fiber-chip grating couplers for 13 µm datacom wavelength band

Benedikovič¹,

Alonso-Ramos²,

Cheben³

et al. 2016

Opt. Express

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Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous. Abstract:We report, for the first time, on the design and experimental demonstration of fiber-chip surface grating couplers based on subwavelength grating engineered nanostructure operating in the low fiber chromatic dispersion window (around 1.3 m wavelengths), which is of great interest for short-reach data communication applications. Our coupler designs meet the minimum feature size requirements of large-volume deepultraviolet stepper lithography processes. The fiber-chip couplers are implemented in a standard 220-nm-thick silicon-on-insulator (SOI) platform and are fabricated by using a single etch process. Several types of couplers are presented, specifically the uniform, the apodized, and the focusing designs. The measured peak coupling efficiency is −2.5 dB (56%) near the central wavelength of 1.3 m. In addition, by utilizing the technique of the backside substrate metallization underneath the grating couplers, the coupling efficiency of up to −0.5 dB (89%) is predicted by Finite Difference Time Domain (FDTD) calculations. 4190-4193 (2015).

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“…Figure 40) are suppressed for clarity. When the Bragg condition [115] is imposed on these grating couplers, we can describe optimal coupling as:…”

Section: Mechanism Of Grating Couplersmentioning

confidence: 99%

Nanometric surface probing through ultra-cold atoms

Khan¹,

Schaefer²,

Pernice³

et al. 2014

SPIE Proceedings

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In this thesis we simulate and design an experimental set up that is going to be used in many applications of applied physics and will give us many answer to unsolved puzzles. This experimental set up is going to feature for the first time the ability to interchange an atom chip frequently and rapidly. The setup also brings two emerging fields, ultracold atoms and nanophotonics, together on an optical table.First, we calculated and simulated the cold atom set-up. Then we simulated and designed an atom chip capable of bringing ultra-cold atoms to sub-micron distances to the chip surface. This new apparatus will present very first ideas on how to use the unique combination of cold atom technology with interchangeable photonics components, both, for basic research and for technological applications to modern information technologies. Furthermore, we can readily exchange the chip to test new components without the need for complicated high-vacuum procedures.The setup will be paired with photonic structures built on-chip for the detailed study of matter-light interactions and, e.g., a depth investigation of dispersion forces (the Casimir interaction and the van der Waals interaction) between cold atoms and carbon nanotubes, that can be measured by scanning probe microscopy. This will allow the integration of photonic waveguides atom chip and will open a new door for modern information technologies.Thesis effort is a joint venture project between the European Laboratory for Non-Linear Spectroscopy (LENS), Florence and the Karlsruhe Institute of Technology (KIT), Karlsruhe, and thrives to bring together experiences in cold atom physics and photonics.

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Efficient Coupling into Polymer Waveguides by Gratings

Cited by 146 publications

References 11 publications

Grating-Assisted Fiber to Chip Coupling for SOI Photonic Circuits

Grating-Assisted Fiber to Chip Coupling for SOI Photonic Circuits

Single-etch subwavelength engineered fiber-chip grating couplers for 13 µm datacom wavelength band

Nanometric surface probing through ultra-cold atoms

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