SECURE FIBRE-OPTIC TRANSMISSION SYSTEM WITH SELECTION AND LOCALISATION OF EMERGENCY SITUATIONS Russian patent published in 2016 - IPC H04B10/00 

FIELD: instrument making.

SUBSTANCE: invention relates to fibre-optic transmission systems (FOTS) with selection and localization of emergency situations and can be used as secured information transmission system with limited access outside of controlled zone. Secured fibre-optic transmission system with selection and localization of emergency situations consists of two sets of receiving-transmitting equipment interconnected by fibre-optic lines, each set comprises receiving-transmitting device connected via optical cords with control unit output of which is connected to the input of fibre-optic line, each set includes power supply unit and control reflectometry control unit, which includes optical splitter, common pole of which is connected to the output of fibre-optic line, the first pole via optical cord is connected to the input of control unit, and the second pole is connected to common pole of optical circulator, the first pole of which is connected to the output of optical transmitter input of which is connected to the first output of micro-controller and the second pole of circulator is connected to the input of optical receiver, the first output of which is connected to the input of analogue-digital converter whose output is connected to the first input of micro-controller and the second output of optical receiver is connected to the input of average level detector, output of which is connected to the second input of micro-controller, control output of which is connected to the input of control relay, input of which is connected to output of power source, and output - to the input of control device power supply unit, the output of micro-controller indication is connected to the input of display device.

EFFECT: technical result is increase of average time between false alarm owing to further analysis of emergency situations.

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