Patent ID: 8908262

Claim:
Method for amplifying an optical signal (S E ), wherein: the optical signal (S E ) is spatially divided into N elementary optical signals (S E . 1 , S E . 2 , . . . , S E .N), the spectral ranges (Δλ E . 1 , Δλ E . 2 , . . . , Δλ E .N) of which are adjacent in pairs and form, substantially by juxtaposition, the spectral range (Δλ E ) of the optical signal (S E ), N being an integer at least equal to 2; the N elementary optical signals (S E . 1 , S E . 2 , . . . , S E .N) are amplified respectively by N elementary amplifiers ( 4 . 1 , 4 . 2 , . . . , 4 .N), the spectral ranges of amplification (Δλ G . 1 , Δλ G . 2 , . . . , Δλ G .N) of which respectively comprise substantially the spectral ranges (Δλ E . 1 , Δλ E . 2 , . . . , Δλ E .N) of said N elementary optical signals; the N amplified elementary optical signals (S S . 1 , S S . 2 , . . . , S S .N) are assembled to form an amplified optical signal (S S ), the spectral range (Δλ S ) of which substantially coincides with a predetermined spectral range; and the spectral phases of the N initial elementary optical signals (S E . 1 , S E . 2 , . . . , S E .N) are adjusted before amplification on the basis of the spectral phase of said amplified optical signal (S S ).