SWG dispersion engineering for ultra-broadband photonic devices

Robert Halir; Alejandro Maese-Novo; Sebastián Romero-García; Diego Pérez-Galacho; Luis Zavargo-Peche; Alejandro Ortega-Moñux; Íñigo Molina-Fernández; J. Gonzalo Wangüemert-Pérez; Pavel Cheben

doi:10.1117/12.2017229

22 May 2013 SWG dispersion engineering for ultra-broadband photonic devices

Robert Halir, Alejandro Maese-Novo, Sebastián Romero-García, Diego Pérez-Galacho, Luis Zavargo-Peche, Alejandro Ortega-Moñux, Íñigo Molina-Fernández, J. Gonzalo Wangüemert-Pérez, Pavel Cheben

Author Affiliations +

Proceedings Volume 8767, Integrated Photonics: Materials, Devices, and Applications II; 87670R (2013) https://doi.org/10.1117/12.2017229
Event: SPIE Microtechnologies, 2013, Grenoble, France

Abstract

In most integrated optics platforms device design is restricted to variations in the lateral dimensions, and a small set of etch depths. Sub-wavelength gratings (SWGs) in silicon-on-insulator enable engineering of refractive index in a wide range. SWGs exhibit a pitch smaller than the wavelength of light propagating through them, thereby suppressing diffraction and acting as a homogenous medium with an equivalent refractive index controlled by the duty-cycle. Here, we propose to not only engineer refractive index, but to control SWG dispersion. We use this concept to design ultra-broadband directional couplers (DCs) and multimode interference couplers (MMIs) with a fivefold bandwidth enhancement compared to conventional devices.

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Robert Halir, Alejandro Maese-Novo, Sebastián Romero-García, Diego Pérez-Galacho, Luis Zavargo-Peche, Alejandro Ortega-Moñux, Íñigo Molina-Fernández, J. Gonzalo Wangüemert-Pérez, and Pavel Cheben "SWG dispersion engineering for ultra-broadband photonic devices", Proc. SPIE 8767, Integrated Photonics: Materials, Devices, and Applications II, 87670R (22 May 2013); https://doi.org/10.1117/12.2017229

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