DOUBLE PASSIVE FIBRE-OPTIC NETWORK Russian patent published in 2011 - IPC H04B10/12 

FIELD: information technology.

SUBSTANCE: double passive fibre-optic network has first and second fibre-optic bidirectional buses, first and second central control units (controllers), multiple subscriber points of the first network and multiple subscriber points of the second network, directed X-couplers of the first bus and directed X-couplers of the second bus, as well as paired and non-paired optical circulators. Transmission to the first network is carried out at wavelength λ₁, and to the second at wavelength λ₂ (λ₁ ≠ λ₂). The directed X-couplers, in the order of their arrangement in the buses from the first to the second controller, have an increasing branching coefficient at wavelength λ₁ for transmission to the first network and a decreasing branching coefficient at wavelength λ₂ for transmission to the second network.

EFFECT: high reliability of the network owing to possibility of switching to operation on a standby bus in case of default in the first bus, more subscriber points serviced by the network.

6 cl, 6 dwg