A terminal for optical communication by laser signals, comprising a tracking and acquisition detector , of matrix image sensor type in which photosensitive elements are arranged at intersections of rows and columns inside a detection surface (S), the terminal being arranged to, upon use of said terminal, receive first laser signals emitted by a source which is external to said terminal, and transmit second laser signals to said external source, and so that a part of the first laser signals and a part of the second laser signals are incident on the detection surface (S) of the tracking and acquisition detector , the terminal being further arranged to, upon the use of said terminal, inject another part of the first laser signals into an optical fibre , through an input end (E) of said optical fibre, and the terminal being adapted so that, upon the use: - a radiation called a calibration radiation is led in the optical fibre and exits through the input end (E) of said optical fibre, and - an image of the input end (E) of the optical fibre is formed on the detection surface (S) of the tracking and acquisition detector with the calibration radiation, the terminal being characterised in that it further comprises at least one spectral filtering element which is disposed so that at least the part of the second laser signals and the calibration radiation which then reach the detection surface (S) of the tracking and acquisition detector pass therethrough, the at least one spectral filtering element having a transmission value for a wavelength of the second laser signals which is lowerthan an average transmission value of said at least one spectral filtering element, effective on a spectral detection interval of the calibration radiation by the tracking and acquisition detector. the terminal being arranged to, upon use of said terminal, receive first laser signals emitted by a source which is external to said terminal, and transmit second laser signals to said external source, and so that a part of the first laser signals and a part of the second laser signals are incident on the detection surface (S) of the tracking and acquisition detector , the terminal being further arranged to, upon the use of said terminal, inject another part of the first laser signals into an optical fibre , through an input end (E) of said optical fibre, and the terminal being adapted so that, upon the use: - a radiation called a calibration radiation is led in the optical fibre and exits through the input end (E) of said optical fibre, and - an image of the input end (E) of the optical fibre is formed on the detection surface (S) of the tracking and acquisition detector with the calibration radiation, - a radiation called a calibration radiation is led in the optical fibre and exits through the input end (E) of said optical fibre, and - an image of the input end (E) of the optical fibre is formed on the detection surface (S) of the tracking and acquisition detector with the calibration radiation, the terminal being characterised in that it further comprises at least one spectral filtering element which is disposed so that at least the part of the second laser signals and the calibration radiation which then reach the detection surface (S) of the tracking and acquisition detector pass therethrough, the at least one spectral filtering element having a transmission value for a wavelength of the second laser signals which is lowerthan an average transmission value of said at least one spectral filtering element, effective on a spectral detection interval of the calibration radiation by the tracking and acquisition detector. <EOS>