A semiclassical theory is developed describing transformation of the quantum statistics of radiation on its passage through various optical systems (OSs) including semitransparent mirrors and amplifying and absorbing media (Fig. 1). The signal intensity is defined in terms of this theory as the intensity of the total field of this signal and zero noises which have passed through an OS minus intensity of the input noise in the reception band:

© 1990 Optical Society of America

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