Dispersion in optical fibers and timing for particle identification
  In the framework of the TOF Wall laser calibration system of the HARP experiment, a study of time dispersion properties of mono-mode and multi-mode optical fibers in the green band (532 nm) has been carried out. Dispersion less than 4 ps/m has been obtained with $\approx$10 $\mu$m core diameter fibers. 
Fabio Paleari