title: Demonstration of a compact bilayer inverse taper coupler for Si-photonics with enhanced polarization insensitivity.
abstract: We demonstrate a compact (30 μm long) broadband bilayer inverse taper edge-coupler for silicon photonics with a 1.7 dB coupling loss from a commercially available focused fiber with 5 μm mode diameter. We compare the performance of our bilayer taper with a conventional SOI inverse taper coupler and show that our bilayer coupler achieves between 1.5 dB to 2 dB improvement in the coupling efficiencies for both the TE and TM polarizations. The dimensions and fabrication steps for our bilayer taper are simple and compatible with standard foundry processes.
authors.forename: Arnab
authors.initials: A
authors.lastname: Dewanjee
authors.forename: Jan Niklas
authors.initials: JN
authors.lastname: Caspers
authors.forename: James Stewart
authors.initials: JS
authors.lastname: Aitchison
authors.forename: Mo
authors.initials: M
authors.lastname: Mojahedi