FIELD: instrument making.
SUBSTANCE: invention relates to secure fibre-optic transmission systems and can be used as duplex multichannel fibre-optic transmission system (FOTS) to transmit confidential information over uncontrolled territory. For this purpose, transmission system with spectral division of signals includes protection controller operating wavelength of which is larger than the wavelength of any optical transmitters, herewith protection controller input is connected to optical output of multiplexer by fibre-optic cord, and output is connected via fibre-optic cord to optical input of demultiplexer, linear inputs and outputs of protection controllers are interconnected by fibre-optic transmission lines.
EFFECT: technical result consists in reducing number of monitoring and control means and increasing control sensitivity.
1 cl, 3 dwg
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