Low-loss, compact, spot-size-converter based vertical couplers for photonic integrated circuits

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dc.contributor.authorSingaravelu, P. K. J.
dc.contributor.authorDevarapu, G. C. R.
dc.contributor.authorSchulz, Sebastian A.
dc.contributor.authorWilmart, Quentin
dc.contributor.authorMalhouitre, Stéphane
dc.contributor.authorOlivier, Ségolène
dc.contributor.authorO'Faolain, Liam
dc.date.accessioned2024-01-17T14:37:27Z
dc.date.available2024-01-17T14:37:27Z
dc.date.issued2019
dc.description.abstractIn recent years, the monolithic integration of new materials such as SiN, Ge and LiNbO3 on silicon (Si) has become important to the Si photonics community due to the possibility of combining the advantages of both material systems. However, efficient coupling between the two different layers is challenging. In this work, we present a spot size converter based on a two-tier taper structure to couple the optical mode adiabatically between Si and SiN. The fabricated devices show a coupling loss as low as 0.058 dB ± 0.01 dB per transition at 1525 nm. The low coupling loss between the Si to SiN, and vice versa, reveals that this interlayer transition occurs adiabatically for short taper lengths (<200 μm). The high refractive index contrast between the Si and SiN is overcome by matching the optical impedance. The proposed two-tier taper structure provides a new platform for optoelectronic integration and a route towards 3D photonic integrated circuits. © 2019 IOP Publishing Ltd.en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationSingaravelu, P. K., Devarapu, G. C. R., Schulz, S. A., Wilmart, Q., Malhouitre, S., Olivier, S. and O'Faolain, L. (2019) 'Low-loss, compact, spot-size-converter based vertical couplers for photonic integrated circuits', Journal of Physics D: Applied Physics, 52(21), p.214001. https://doi.org/10.1088/1361-6463/ab07d5en
dc.identifier.doi10.1088/1361-6463/ab07d5
dc.identifier.issn223727
dc.identifier.issued21
dc.identifier.journaltitleJournal of Physics D: Applied Physicsen
dc.identifier.urihttps://hdl.handle.net/10468/15398
dc.identifier.volume52
dc.language.isoenen
dc.publisherInstitute of Physics Publishingen
dc.rights© 2019, IOP Publishing Ltd. This is an author-created, un-copyedited version of an article accepted for publication in Journal of Physics D: Applied Physics. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at: https://iopscience.iop.org/article/10.1088/1361-6463/ab07d5en
dc.subjectInverse tapersen
dc.subjectSpot size convertersen
dc.subjectVertical couplingen
dc.titleLow-loss, compact, spot-size-converter based vertical couplers for photonic integrated circuitsen
dc.typeArticle (peer-reviewed)en
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