Abstract
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).
© 2012 IEEE
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