  Vortex Fiber Nulling (VFN) is an interferometric method for suppressing
starlight to detect and spectroscopically characterize exoplanets. It relies on
a vortex phase mask and single-mode fiber to reject starlight while
simultaneously coupling up to 20% of the planet light at separations of
$\lesssim1\lambda/D$, thereby enabling spectroscopic characterization of a
large population of RV and transit-detected planets, among others, that are
inaccessible to conventional coronagraphs. VFN has been demonstrated in the lab
at visible wavelengths and here we present the latest results of these
experiments. This includes polychromatic nulls of $5\times10^{-4}$ in 10%
bandwidth light centered around 790 nm. An upgraded testbed has been designed
and is being built in the lab now; we also present a status update on that work
here. Finally, we present preliminary K-band (2 $\mu$m) fiber nulling results
with the infrared mask that will be used on-sky as part of a VFN mode for the
Keck Planet Imager and Characterizer Instrument in 2021.
