FIELD: radio engineering, communication.
SUBSTANCE: invention relates to communication engineering and can be used in optical communication systems. The invention provides a method and an apparatus for detecting in-band optical signal-to-noise ratio (OSNR), the method comprising steps of: determining power PCW1 of a first optical signal at the transmitting side, power PCW2 of a second optical signal at the transmitting side and overall power PS of the signal; determining the ratio k1 PCW2 to PS and the ratio k2 PCW1 to PCW2 from PCW1, PCW2 and PS; determining power P'CW1 of the first optical signal at the point of detection and power P'CW2 of the second optical signal at the point of detection; determining the ratio k3 P'CW1 to P'CW2 from P'CW1 and P'CW2 and determining the OSNR from k1, k2 and k3.
EFFECT: high noise immunity of transmission.
13 cl, 7 dwg
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