Print Email Facebook Twitter Demonstration of Large Coupling-Induced Phase Delay in Silicon Directional Cross-Couplers Title Demonstration of Large Coupling-Induced Phase Delay in Silicon Directional Cross-Couplers Author Westerveld, W.J. Pozo, J. Leinders, S.M. Yousefi, M. Urbach, H.P. Faculty Applied Sciences Department ImPhys/Imaging Physics Date 2013-11-26 Abstract We investigate directional couplers in silicon-on-insulator photonic technology. We theoretically and experimentally demonstrate a large coupling-induced phase delay that occurs when nearly all light is coupled from one waveguide to the other, i.e., when the coupler operates as a cross-coupler. We show that even a tiny asymmetry in the two waveguides of the coupler causes a significant additional phase delay. The observed change in the free-spectral-range of ring resonators from 5.0 nm to 6.4 nm is explained by a small 0.1% difference in the propagation constants of the two waveguides. Such a difference can be caused by for example a 1 nm difference in the widths of the two waveguides. Subject directional couplersoptical waveguidesintegrated opticsoptical devicesoptical filterssilicon-on-insulator technology To reference this document use: http://resolver.tudelft.nl/uuid:a540b95b-1970-407e-b329-db829db22212 DOI https://doi.org/10.1109/JSTQE.2013.2292874 Publisher IEEE ISSN 1077-260X Source IEEE Journal of Selected Topics in Quantum Electronics, 20 (4), 2014 Part of collection Institutional Repository Document type journal article Rights © 2013 IEEE Files PDF Westerveld_2014.pdf 664.56 KB Close viewer /islandora/object/uuid:a540b95b-1970-407e-b329-db829db22212/datastream/OBJ/view