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4 March 2019 Subwavelength silicon photonic metamaterials for mode multiplexing and polarization control (Conference Presentation)
Aitor V. Velasco, David González-Andrade, Alaine Herrero-Bermello, Antonio Dias, J. G. Wangüemert-Pérez, Alejandro Ortega-Moñux, Íñigo Molina-Fernández, Robert Halir, José Manuel Luque-González, Pavel Cheben
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Proceedings Volume 10922, Smart Photonic and Optoelectronic Integrated Circuits XXI; 1092206 (2019) https://doi.org/10.1117/12.2506148
Event: SPIE OPTO, 2019, San Francisco, California, United States
Abstract
Subwavelength gratings (SWG) enable the synthesis of dispersion-engineered photonic metamaterials, leading to unprecedented performance in silicon photonic devices. In this work, we further explore the potential of this technology by presenting an ultra-broadband mode de/multiplexer (DE/MUX) and a polarization beamsplitter (PBS) with a novel approach for anisotropy engineering through tilted SWG structures. The proposed two-mode DE/MUX consists of a SWG-engineered multimode interference coupler (MMI), a 90º phase-shifter and a symmetric Y-junction. SWG structures are also included in fiber-to-chip couplers and in adiabatic transitions between Si-wire interconnect waveguides and the MMI. Simulated insertion losses of the proposed device are less than 0.18 dB in the wavelength range from 1.4 μm to 1.7 μm. These values further decrease down to 0.11 dB for the TE0 mode and 0.07 dB for the TE1 mode in the C-band wavelength range (1.53 – 1.57 μm). Crosstalk of both modes is below -20.6 dB in the wavelength range from 1.4 μm to 1.7 μm and below -36 dB within the C-band. The proposed PBS consists of an MMI incorporating tilted sub-wavelength gratings. This novel anisotropy engineering technique provides independent control on the propagation constant of each polarization, enabling the implementation of shorter devices with improved performance. An extinction ratio over 20 dB and insertion losses below 1.5 dB in a 116-nm-wide bandwidth are demonstrated, for a MMI length under 100 μm.
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Aitor V. Velasco, David González-Andrade, Alaine Herrero-Bermello, Antonio Dias, J. G. Wangüemert-Pérez, Alejandro Ortega-Moñux, Íñigo Molina-Fernández, Robert Halir, José Manuel Luque-González, and Pavel Cheben "Subwavelength silicon photonic metamaterials for mode multiplexing and polarization control (Conference Presentation)", Proc. SPIE 10922, Smart Photonic and Optoelectronic Integrated Circuits XXI, 1092206 (4 March 2019); https://doi.org/10.1117/12.2506148
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KEYWORDS
Silicon photonics
Brain-machine interfaces
Metamaterials
Multiplexing
Polarization control
Anisotropy
Polarization
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