  GRAVITY is the second generation Very Large Telescope Interferometer
instrument for precision narrow-angle astrometry and interferometric imaging in
the Near Infra-Red (NIR). It shall provide precision astrometry of order 10
microarcseconds, and imaging capability at a few milliarcsecond resolution, and
hence will revolutionise dynamical measurements of celestial objects. GRAVITY
is currently in the last stages of its integration and tests in Garching at
MPE, and will be delivered to the VLT Interferometer (VLTI) in 2015. We present
here the instrument, with a particular focus on the components making use of
fibres: integrated optics beam combiners, polarisation rotators, fibre
differential delay lines, and the metrology.
