Patent ID: 8582979

Claim:
A method for transmitting an OFDM signal (S 0 (t)) [orthogonal frequency division multiplex] in an optical network, comprising the steps of: generating a real valued OFDM signal (S 0 (t)); deriving a limited OFDM signal (S 1 (t)) with limited real values from said OFDM signal (S 0 (t)); applying square root processing to the limited OFDM signal (S 1 (t)) to generate an OFDM baseband signal (S B (t)); converting the OFDM baseband signal (S B (t)) into a single sideband modulation signal (n(t)) represented by n(t)=S B (t)e jφ(t) with S B (t)=√{square root over (S 1 (t))} and φ(t)=H{ ln S B (t)}; and generating a gap free optical single sideband transmission signal (S OT (t)) carrying information of the OFDM baseband signal (S B (t)) in the power of its envelope by modulating an optical carrier (f OC (t)) with the modulation signal n(t); wherein: S 1 (t)=the limited OFDM baseband signal, φ(t)=a phase modulation term, and H{ ln S B (t) }=Hilbert-transform of ln S B (t).