Optical wavelength control system

An optical wavelength control system for an optical source includes a beamsplitter arrangement for propagating radiation from the source over two paths. First and second photodetectors are arranged each in a respective one of said two propagation paths, while a wavelength selective optical filter is interposed in the propagation path from the source to the first photodetector. The first and second photodetectors generate photocurrents indicative of the possible displacement of the actual wavelength of the radiation from said source with respect to a reference wavelength and the power emitted by the optical source, respectively. The system includes a support bench extending in a given plane and the beamsplitter arrangement is arranged to split the radiation from said source towards the photodetectors in a direction substantially perpendicular to the given plane of the support bench.