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Reflectionless tilted grating couplers with improved coupling efficiency based on a silicon overlay

Yanlu Li (UGent) , Lianyan Li (UGent) , Bin Tian (UGent) , Günther Roelkens (UGent) and Roel Baets (UGent)
(2013) IEEE PHOTONICS TECHNOLOGY LETTERS. 25(13). p.1195-1198
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Organization
Project
Center for nano- and biophotonics (NB-Photonics)
Abstract
Grating couplers are important photonic devices on a complementary metal-oxide-semiconductor compatible silicon-on-insulator platform to couple light between optical waveguides and free space optical components or fibers. In this letter, we report the combination of a tilted grating coupler design, which strongly suppresses the back-reflection for light incident on the grating coupler from a waveguide, and a silicon overlay locally deposited on top of the grating region, which enhances the coupling efficiency of the grating coupler, by means of simulation and experiment. The fabricated tilted focusing grating couplers with silicon overlay show a coupling efficiency of -2.2 dB in combination with a back-reflection of around -40 dB when excited from the silicon waveguide. The tilted design also provides an alternative approach to enhance the transmission of a grating coupler when the thickness of the Si overlay is not optimized.
Keywords
coupling efficiency, back-reflection, Tilted grating coupler, BACKREFLECTION, WAVE-GUIDES, INTEGRATED-CIRCUITS, ON-INSULATOR

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Citation

Please use this url to cite or link to this publication:

Chicago
Li, Yanlu, Lianyan Li, Bin Tian, Günther Roelkens, and Roel Baets. 2013. “Reflectionless Tilted Grating Couplers with Improved Coupling Efficiency Based on a Silicon Overlay.” Ieee Photonics Technology Letters 25 (13): 1195–1198.
APA
Li, Yanlu, Li, L., Tian, B., Roelkens, G., & Baets, R. (2013). Reflectionless tilted grating couplers with improved coupling efficiency based on a silicon overlay. IEEE PHOTONICS TECHNOLOGY LETTERS, 25(13), 1195–1198.
Vancouver
1.
Li Y, Li L, Tian B, Roelkens G, Baets R. Reflectionless tilted grating couplers with improved coupling efficiency based on a silicon overlay. IEEE PHOTONICS TECHNOLOGY LETTERS. 2013;25(13):1195–8.
MLA
Li, Yanlu, Lianyan Li, Bin Tian, et al. “Reflectionless Tilted Grating Couplers with Improved Coupling Efficiency Based on a Silicon Overlay.” IEEE PHOTONICS TECHNOLOGY LETTERS 25.13 (2013): 1195–1198. Print.
@article{4195046,
  abstract     = {Grating couplers are important photonic devices on a complementary metal-oxide-semiconductor compatible silicon-on-insulator platform to couple light between optical waveguides and free space optical components or fibers. In this letter, we report the combination of a tilted grating coupler design, which strongly suppresses the back-reflection for light incident on the grating coupler from a waveguide, and a silicon overlay locally deposited on top of the grating region, which enhances the coupling efficiency of the grating coupler, by means of simulation and experiment. The fabricated tilted focusing grating couplers with silicon overlay show a coupling efficiency of -2.2 dB in combination with a back-reflection of around -40 dB when excited from the silicon waveguide. The tilted design also provides an alternative approach to enhance the transmission of a grating coupler when the thickness of the Si overlay is not optimized.},
  author       = {Li, Yanlu and Li, Lianyan and Tian, Bin and Roelkens, G{\"u}nther and Baets, Roel},
  issn         = {1041-1135},
  journal      = {IEEE PHOTONICS TECHNOLOGY LETTERS},
  keyword      = {coupling efficiency,back-reflection,Tilted grating coupler,BACKREFLECTION,WAVE-GUIDES,INTEGRATED-CIRCUITS,ON-INSULATOR},
  language     = {eng},
  number       = {13},
  pages        = {1195--1198},
  title        = {Reflectionless tilted grating couplers with improved coupling efficiency based on a silicon overlay},
  url          = {http://dx.doi.org/10.1109/LPT.2013.2261484},
  volume       = {25},
  year         = {2013},
}

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