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We describe an optical fiber based interferometer to measure velocityprofiles in sheared complex fluids using Dynamic Light Scattering (DLS). Aftera review of the theoretical problem of DLS under shear, a detailed descriptionof the setup is given. We outline the various experimental difficulties inducedby refraction when using a Couette cell. We also show that homodyne DLS is notwell suited to measure quantitative velocity profiles in narrow-gap Couettegeometries. On the other hand, the heterodyne technique allows us to determinethe velocity field inside the gap of a Couette cell. All the technical featuresof the setup, namely its spatial resolution ($\approx 50$--$100 \mu$m) and itstemporal resolution ($\approx 1$ s per point, $\approx 1$ min per profile) arediscussed, as well as the calibration procedure with a Newtonian fluid. Asbriefly shown on oil-in-water emulsions, such a setup permits one to recordboth velocity profiles and rheological data simultaneouslyComment: 13 pages, 16 figures, Submitted to Eur. Phys. J. A

An optical fiber based interferometer to measure velocity profiles in sheared complex fluids