FIELD: optics.
SUBSTANCE: invention relates to optical multiplexers of input/output of optical signals using wave-seal technology (CWDM, DWDM) and can be used for input/output of signals of separate channels from multiplexed signal into fiber-optic transmission systems (FOTL) in any of its sections. In order to achieve the technical result, the optical multiplexer additionally includes series-connected first coupler-clothespin, first circulator, scattered signal back amplifier, adjustable optical attenuator, second circulator and second coupler-clothespin, At that, first and second coupler-clothespins are connected to optical fiber on its bends, third tap of first circulator is connected to output of optical power amplifier, and third tap of second circulator is connected to input of optical preamplifier.
EFFECT: enabling connection in any point of the fiber-optic link with compensation of backscattered signal loss for a reflectometric monitoring system.
1 cl, 3 dwg
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