METHOD OF SETTING UP DUPLEX LINKS IN ONE FIBRE USING OPTICAL SIGNALS OPERATING IN OPPOSITE DIRECTIONS AND HAVING SAME CARRIER WAVELENGTH WITH RETROREFLECTION CONTROL Russian patent published in 2014 - IPC H04B10/25 

FIELD: radio engineering, communication.

SUBSTANCE: method includes using an optical link which ends with bidirectional signal splitters designed to input/output information signals into the optical link; determining overall power of the reflected signal arriving at the input of an optical receiver; comparing said value with the maximum allowable noise power to select the information signal. By eliminating and/or redistributing, on the propagation path of the optical signal between the transmitter and the receiver, elements with a higher level of reflection or replacement thereof with elements with a lower level of reflection, overall power of the reflected signal arriving at the input of the optical receiver is obtained, which is sufficiently low for separating the information signal from the optical signal arriving at the input of the receiver, and the information signal is transmitted in opposite directions using one carrier wavelength for a specific optical link.

EFFECT: high efficiency of using fibre-optic links.

6 dwg, 2 tbl