FIELD: optical communication. SUBSTANCE: multiwave multistage optical amplifier or optical stage includes at least two amplification media GM with different spectra, that is, first and second GM connected in series to amplify signal having two lengths of wave as minimum, that is, first and second lengths of wave. First GM can present optical fiber doped with erbium-aluminosilicate, second GM can be optical fiber doped with erbium-germanium silicate. Gain factor on first length of wave is less than gain factor on second length of wave while power of signal on first length of wave is higher than power of signal on second length of wave and vice versa. EFFECT: substantial increase of degree of automatic control over power in multiwave automatic control optical amplification system on two lengths of wave as minimum. 16 cl, 34 dwg, 2 tbl
