US 11,777,600 B2
Terminal for optical communication by laser signals
Paul Berceau, Toulouse (FR); and Adrien Barbet, Toulouse (FR)
Assigned to AIRBUS DEFENCE AND SPACE SAS, Toulouse (FR)
Appl. No. 18/16,854
Filed by AIRBUS DEFENCE AND SPACE SAS, Toulouse (FR)
PCT Filed Jul. 8, 2021, PCT No. PCT/FR2021/051261
§ 371(c)(1), (2) Date Jan. 18, 2023,
PCT Pub. No. WO2022/018343, PCT Pub. Date Jan. 27, 2022.
Claims priority of application No. 20 07584 (FR), filed on Jul. 20, 2020.
Prior Publication US 2023/0231627 A1, Jul. 20, 2023
Int. Cl. H04B 10/112 (2013.01); H04B 10/118 (2013.01)
CPC H04B 10/112 (2013.01) [H04B 10/118 (2013.01)] 12 Claims
OG exemplary drawing
 
1. 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,
the terminal being arranged to, during a use of said terminal, receiving first laser signals emitted by a source which is external to said terminal, and transmitting 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 of the tracking and acquisition detector,
the terminal being further arranged to, during the use of said terminal, injecting another part of the first laser signals into an optical fibre, through an input end of said optical fibre, and the terminal being adapted so that, during the use:
a radiation called calibration radiation is led in the optical fibre and exits through the input end of said optical fibre, and
an image of the input end of the optical fibre is formed on the detection surface of the tracking and acquisition detector using the calibration radiation,
the terminal 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 of the tracking and acquisition detector pass through the at least one spectral filtering element, said at least one spectral filtering element having a transmission value for a wavelength of the second laser signals which is lower than an average transmission value of said at least one spectral filtering element, effective over a spectral detection interval of the tracking and acquisition detector for the calibration radiation.