Method for transmitting two-dimensional information and system for effecting same

摘要

A method is disclosed for transmitting two-dimensional information about an object with the aid of a two-dimensional reference signal and a two-dimensional useful signal through an optical communication line. The two-dimensional useful signal is formed by two-dimensional spatial modulation of a coherent light flux. The two-dimensional reference signal is displaced with respect to the two-dimensional useful signal by a time interval which is not in excess of the time instability interval of the communication line. A hologram is recorded at the output of the communication line, of the two-dimensional useful signal matched in time and space with the two-dimensional reference signal. A Fourier hologram can be made of the two-dimensional useful signal and the two-dimensional reference signal in relation to the two-dimensional reference signal, which, when reproduced, makes it possible to obtain the undistorted two-dimensional information that has been transmitted. In addition, a system is disclosed for transmitting two-dimensional information at optical frequencies in accordance with the above method.