FIELD: fiber-optic communication lines. SUBSTANCE: optical insulator designed for simultaneous unidirectional transmission of light beams emitted by plurality of optical fibers incorporates mentioned plurality of optical fibers, pair of lenses for converting light beams coming from or entered in optical fibers, pair of symmetrical dual-beam refracting components having pair or plurality of tilted faces, Faraday revolver disposed between dual-beam refracting components for revolving light beams incident on it at 45 deg. EFFECT: ability of unidirectional transmission of plurality of light beams. 5 cl, 7 dwg
