FIELD: fiber-optic and open digital and analog communication lines.
SUBSTANCE: proposed method involves concurrent transfer of two optical data signals over optical communication line, their reception and comparison, and noise suppression. Optical data signals are shaped across output of nonlinear optical element by supplying at least one optical beam to element input and varying input power or phase, or frequency of one optical beam supplied to input of nonlinear optical element, or by varying electric or acoustic field applied to this element. In this way optical change-over between two unidirectional distributed and coupled waves propagating through nonlinear optical element is ensured. Each of these waves at output of nonlinear optical element corresponds to optical data signal. These data signals are supplied to differential amplifier designed for subtracting electric signals and/or to correlator which separates coinciding part of amplitude of these signals as function of time. As an alternative, optical data signals are shaped across output of tunnel-coupled optical waveguides of which at least one functions as nonlinear optical element.
EFFECT: enhanced noise immunity of line, eliminated impact of photodetector noise onto data signal reception.
33 cl, 4 dwg
