Reducing the front face echo is one of the major problems encountered in backscattering measurements of optical fibers. A simple method is proposed in order to eliminate completely this unwanted signal for both multimode and single‐mode fibers. The setup is very simple and no special preparation of the fiber is needed. The insertion losses of the filtering device are very low and the detector is protected against direct reflections. In the case of multimode fibers a selective analysis of the backscattered signal can be performed.