  SPICA-FT is part of the CHARA/SPICA instrument which combines a visible 6T
fibered instrument (SPICAVIS) with a H-band 6T fringe sensor. SPICA-FT is a
pairwise ABCD integrated optics combiner. The chip is installed in the MIRC-X
instrument. The MIRC-X spectrograph could be fed either by the classical 6T
fibered combiner or by the SPICA-FT integrated optics combiner. SPICA-FT also
integrates a dedicated fringe tracking software, called the opd-controller
communicating with the main delay line through a dedicated channel. We present
the design of the integrated optics chip, its implementation in MIRC-X and the
software architecture of the group-delay and phase-delay control loops. The
final integrated optics chip and the software have been fully characterized in
the laboratory. First on-sky tests of the integrated optics combiner began in
2020. We continue the on-sky tests of the whole system (combiner + software) in
Spring and Summer 2022. We present the main results, and we deduce the
preliminary performance of SPICA-FT.
