Polarization and wavelength agnostic nanophotonic beam splitter
Abstract
High-performance optical beam splitters are of fundamental importance for the development of advanced silicon photonics integrated circuits. However, due to the high refractive index contrast of the silicon-on-insulator platform, state of the art Si splitters are hampered by trade-offs in bandwidth, polarization dependence and sensitivity to fabrication errors. Here, we present a new strategy that exploits modal engineering in slotted waveguides to overcome these limitations, enabling ultra-wideband polarization-insensitive optical power splitters, with relaxed fabrication tolerances. The proposed splitter relies on a single-mode slot waveguide which is transformed into two strip waveguides by a symmetric taper, yielding equal power splitting. Based on this concept, we experimentally demonstrate -30.5 dB polarization-independent transmission in an unprecedented 390 nm bandwidth (1260 - 1650 nm), even in the presence of waveguide width deviations as large as 25 nm.
Keywords
Cite
@article{arxiv.1807.05952,
title = {Polarization and wavelength agnostic nanophotonic beam splitter},
author = {David González-Andrade and Christian Lafforgue and Elena Durán-Valdeiglesias and Xavier Le Roux and Mathias Berciano and Eric Cassan and Delphine Marris-Morini and Aitor V. Velasco and Pavel Cheben and Laurent Vivien and Carlos Alonso-Ramos},
journal= {arXiv preprint arXiv:1807.05952},
year = {2018}
}