Simple Estimation of Fiber Dispersion and Laser Chirp Parameters Using the Downhill Simplex Fitting Algorithm

Luiz Anet Neto (1, 2) , Didier Erasme (3) , Naveena Genay (1) , Philippe Chanclou (1) , Qian Deniel (1) , Fatoumata Traore (1) , Thomas Anfray (2) , Rajaâ Hmadou (1) , Christelle Aupetit-Berthelemot (2)

1 Orange Labs [Lannion]
2 XLIM-C2S2 - C2S2
3 Télécom ParisTech

We report on a simple and fast method to estimate the fiber dispersion and laser chirp parameters on a dispersive Intensity Modulation and Direct Detection (IM/DD) optical channel. Based on the general IM/DD small-signal frequency response, we use the Downhill-Simplex algorithm to fit the channel measurement retrieved with a network analyzer to a general mathematical model. The method is proven to be quite efficient for light sources of different natures and with different adiabatic and transient chirp characteristics, including a Distributed Feedback (DFB) laser, an Electroabsorption modulator (EAM) and even a Reflective Semiconductor Optical Amplifier with fiber-Bragg grating (RSOA-FBG).

Mots clés: Chirp; Chromatic dispersion; Curve fitting; IM/DD; Nelder-Mead; Simplex

Domaines: Optique / photonique

Luiz Anet Neto, Didier Erasme, Naveena Genay, Philippe Chanclou, Qian Deniel, et al.. Simple Estimation of Fiber Dispersion and Laser Chirp Parameters Using the Downhill Simplex Fitting Algorithm. Journal of Lightwave Technology, 2013, 31 (2), pp.334-342. ⟨10.1109/JLT.2012.2226704⟩. ⟨hal-00917354⟩