High efficiency DBR assisted grating chirp generators for silicon nitride fiber-chip coupling.

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2019
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Abstract
Silicon Nitride (SiN) is emerging as a promising material for a variety of integrated photonic applications. Given its low index contrast however, a key challenge remains to design efficient couplers for the numerous platforms in SiN photonics portfolio. Using a combination of bottom reflector and a chirp generating algorithm, we propose and demonstrate high efficiency, grating couplers on two distinct SiN platforms. For a partially etched grating on 500 nm thick SiN, a calculated peak efficiency of -0.5 dB/coupler is predicted, while for a fully etched grating on 400 nm thick SiN, an efficiency of -0.4 dB/coupler is predicted. Experimentally measured coupling efficiencies are observed to be -1.17 and -1.24 dB/coupler for the partial and fully etched grating couplers respectively in the C-L band region. Furthermore, through numerical simulations, it is shown that the chirping algorithm can be implemented in eight additional combinations comprising SiN film thickness between 300-700 nm as well as alternate claddings, to achieve a per coupler loss between -0.33 to -0.65 dB.
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Authors Nambiar, Siddharth;Ranganath, Praveen;Kallega, Rakshitha;Selvaraja, Shankar Kumar;
Journal Scientific reports
Year 2019
DOI
10.1038/s41598-019-55140-8
URL
Keywords
crystal depressed-cladding waveguide directional coupler femtosecond laser writing integrated photonics, quantum memory yttrium aluminum garnet

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