A device and a method are provided for merging a plurality of optical components associated with one wavelength into an optical component associated with the wavelength. The merging device includes, for each optical component of the plurality of components for merging: an optical element arranged to switch to a blocking position for blocking the optical component for merging, as a function of a blocking signal; a duplication element arranged to duplicate the optical component for merging for sending to combination element. The combination element is arranged to obtain the blocking signal by combining the duplicated optical components of the plurality of components other than the optical component for merging. A merging element is arranged to merge the optical components output by the optical element. The merging device may be integrated in an optical combiner of optical signals.