optic.models.channels.ssfm

ssfm(Ei, param=None)

Split-step Fourier method (symmetric, single-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.NF: edfa noise figure [dB] [default: 4.5 dB]

  • param.seed: seed for the random number generator [default: None]

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

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

Returns:

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

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

References

[1] G. P. Agrawal, Nonlinear Fiber Optics, Elsevier Science, 2013.

[2] O. V. Sinkin, R. Holzlöhner, J. Zweck, e C. R. Menyuk, “Optimization of the split-step Fourier method in modeling optical-fiber communications systems”, Journal of Lightwave Technology, vol. 21, nº 1, p. 61–68, jan. 2003, doi: 10.1109/JLT.2003.808628.