DEVICE FOR PHASE STABILIZATION OF HIGH- FREQUENCY ANALOG SIGNAL WHICH IS TRANSMITTED THROUGH FIBER-OPTICAL COMMUNICATION LINE Russian patent published in 1998 - IPC

FIELD: communication. SUBSTANCE: device has reference signal oscillator and oscillators of signals of f2 and f3 frequencies which are connected to coupler. Output of coupler is connected to input of optical transmitter, which output is connected to input of light guide. Output of light guide is connected to input of line photodetector. Output of line photodetector sends signal, which is filtered by filter, to input of phase shifter. Signals of oscillators are sent to converters through coupler and low-pass filters. Outputs of converters are connected to phase detector, which output is connected to input of phase shifter through scaling amplifier. EFFECT: increased transmission distance, increased signal-to-noise ratio for constant initial wavelength of fiber-optical communication line. 1 dwg