FIELD: fiber-optic communication lines. SUBSTANCE: the device has the main light conduit and a directional coupler. The coupler is made in the form of a fiber-optic coupler, whose common end is installed relative to the end of the main light conduit in a definite spaced relation. EFFECT: enhanced efficiency of directivity of the light flux and decoupling of the direct and return communication channels. 1 dwg
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