optic.dsp.equalization.manakovDBP

manakovDBP(Ei, param)

Run the Manakov SSF digital backpropagation (symmetric, dual-pol.).

Parameters:

• Ei (np.array) – Input optical signal field.

• param (optic.utils.parameters object) –

  Physical/simulation parameters of the optical channel.

  • param.Ltotal: total fiber length [km][default: 400 km]

  • param.Lspan: span length [km][default: 80 km]

  • param.hz: step-size for the split-step Fourier method [km][default: 0.5 km]

  • param.alpha: fiber attenuation parameter [dB/km][default: 0.2 dB/km]

  • param.D: chromatic dispersion parameter [ps/nm/km][default: 16 ps/nm/km]

  • param.gamma: fiber nonlinear parameter [1/W/km][default: 1.3 1/W/km]

  • param.Fc: carrier frequency [Hz] [default: 193.1e12 Hz]

  • param.Fs: simulation sampling frequency [samples/second][default: None]

  • param.prec: numerical precision [default: np.complex128]

  • param.amp: ‘edfa’, ‘ideal’, or ‘None. [default:’edfa’]

  • param.maxIter: max number of iter. in the trap. integration [default: 10]

  • param.tol: convergence tol. of the trap. integration.[default: 1e-5]

  • param.nlprMethod: adap step-size based on nonl. phase rot. [default: True]

  • param.maxNlinPhaseRot: max nonl. phase rot. tolerance [rad][default: 2e-2]

  • param.prgsBar: display progress bar? bolean variable [default:True]

  • param.saveSpanN: specify the span indexes to be outputted [default:[]]

  • param.returnParameters: bool, return channel parameters [default: False]

Returns:

• Ech (np.array) – Optical signal after nonlinear backward propagation.

• param (parameter object (struct)) – Object with physical/simulation parameters used in the split-step alg.

References

[1] E. Ip e J. M. Kahn, “Compensation of dispersion and nonlinear impairments using digital backpropagation”, Journal of Lightwave Technology, vol. 26, nº 20, p. 3416–3425, 2008, doi: 10.1109/JLT.2008.927791.

[2] E. Ip, “Nonlinear compensation using backpropagation for polarization-multiplexed transmission”, Journal of Lightwave Technology, vol. 28, nº 6, p. 939–951, mar. 2010, doi: 10.1109/JLT.2010.2040135.