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27 February 2015 Low-loss adiabatically-tapered high-contrast gratings for slow-wave modulators on SOI
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Proceedings Volume 9372, High Contrast Metastructures IV; 93720G (2015)
Event: SPIE OPTO, 2015, San Francisco, California, United States
In this communication, we report about the design, fabrication, and testing of Silicon-based photonic integrated circuits (Si-PICs) including low-loss flat-band slow-light high-contrast-gratings (HCGs) waveguides at 1.31 μm. The light slowdown is achieved in 300-nm-thick silicon-on-insulator (SOI) rib waveguides by patterning adiabatically-tapered highcontrast gratings, capable of providing slow-light propagation with extremely low optical losses, back-scattering, and Fabry-Pérot noise. In detail, the one-dimensional (1-D) grating architecture is capable to provide band-edge group indices ng ~ 25, characterized by overall propagation losses equivalent to those of the index-like propagation regime (~ 1-2 dB/cm). Such photonic band-edge slow-light regime at low propagation losses is made possible by the adiabatic apodization of such 1-D HCGs, thus resulting in a win-win approach where light slow-down regime is reached without additional optical losses penalty. As well as that, a tailored apodization optimized via genetic algorithms allows the flattening of slow-light regime over the wavelength window of interest, therefore suiting well needs for group index stability for modulation purposes and non-linear effects generation. In conclusion, such architectures provide key features suitable for power-efficient high-speed modulators in silicon as well as an extremely low-loss building block for non-linear optics (NLO) which is now available in the Si photonics toolbox.
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Corrado Sciancalepore, Karim Hassan, Thomas Ferrotti, Julie Harduin, Hélène Duprez, Sylvie Menezo, and Badhise Ben Bakir "Low-loss adiabatically-tapered high-contrast gratings for slow-wave modulators on SOI", Proc. SPIE 9372, High Contrast Metastructures IV, 93720G (27 February 2015);


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