  We propose a new technique, the use of FBGs (fiber Bragg gratings), for
accurate, easy and low cost wavelength calibration of GAIA, RAVE and follow-ups
spectra at local Observatories. FBGs mark the spectra with absorption lines,
freely defined in number and position during the fibers manufacturing. The
process goes in parallel with the science exposure and through the same optical
train and path, thus ensuring the maximum return in wavelength calibration
accuracy. Plans to manufacture and test FBGs for the CaII/Paschen region are
underway at the Astronomical Observatory of Padova.
