Method for the compensation of nonlinear impairments in dispersion-managed optical fiber links using phase conjugation and equivalent optical link

1. A method for nonlinearity compensation for an optical transmission link comprising the steps of:

determining a dispersion effect of a transmission link;

applying a phase conjugation to the transmission link, said phase conjugation responsive to an input wave over said transmission link and providing a conjugated version of said input wave; and

configuring an optimum equivalent link responsive to said phase conjugation after said transmission link to compensate for a non-linear dispersion effect from said transmission link; wherein said equivalent link comprises a configuration responsive to

Γ=∫ 0 Ld(1) exp[ iγ 1 ( z ) P 1 ( z ) z]dz−∫ 0 Ld(2) exp[ iγ 2 ( z ) P 2 ( z ) z]dz

where Γ denotes an equivalence factor, L d(1) denotes a dispersion length of said transmission link, L d(2) denotes a dispersion length of said equivalent link, γ 1 denotes a nonlinear parameter of said transmission link; γ 2 denotes a nonlinear parameter of said equivalent link, P 1 (z) denotes a power evolution of said transmission link, and P 2 (z) denotes a power evolution of said equivalent link.

2. The method of claim 1 , wherein said equivalent link provides an accumulated non-linear phase shift that counteracts a non-linear phase from said transmission link.

3. The method of claim 1 , wherein L d(1) and γ 1 are given, and an optimum P 2 (z), γ 2 and L d(2) is determined so Γ is minimized.

4. The method of claim 1 , wherein fine-tuning of parameters of said equivalence factor is determined through simulation to maximize transmission performance over said transmission link.

5. The method of claim 1 , wherein said equivalent link is configured with erbium-doped fiber amplification EDFA.