Characterization of noise in semiconductor lasers and its influence in a practical FSK link

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Abstract
Quantum fluctuations in a semiconductor laser produce noise both in the amplitude and in the phase of the output field. These noise sources have a significant effect in optical coherent systems. Measurements of the field spectrum and RIN spectrum of a DFB laser, at three different optical power levels, are fitted to the corresponding analytical curves. The shapes of the measured curves are closely matched by the analytical expressions and the fitting produced very similar values for the common parameters in the field and RIN expressions, providing a good validation for the theory. These analytical/experimental results show a non-lorentzian shape for the field spectrum, as opposed to the commonly used lorentzian shape. Using the more accurate laser models derived from our work, we were able to predict successfully by simulation, the experimental values obtained for the BER in a practical FSK system.

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