FIELD: electrical communication engineering.
SUBSTANCE: invention relates to communication engineering and can be used to decode a combined AM/FM encoded optical signal. For this purpose the method includes following steps: combining said encoded optical signal with light from a local oscillator configured with a local oscillator frequency; converting the combined local oscillator signal and encoded optical signal into one or more electrical signals by means of at least one opto-electrical converter having a predefined frequency bandwidth, thereby providing an amplified and encoded electrical signal having one or more encoded signal currents, where one type of states has a higher oscillation frequency than the other type of states; rectifying the encoded signal currents, thereby obtaining an encoded power spectrum, wherein said power spectrum has different states, such as "0"-states and "1"-states, with different power levels which can be discriminated; defining the local oscillator frequency by a positive local oscillator frequency-offset from the frequency of one of the states in said encoded optical signal and selecting said local oscillator frequency-offset depending on said frequency bandwidth.
EFFECT: technical result is improved quality of communication.
27 cl, 29 dwg
