  We present a stochastic procedure to investigate the correlation spectra of
quantum dot superluminescent diodes. The classical electric field of a diode is
formed by a polychromatic superposition of many independent stochastic
oscillators. Assuming fields with individual carrier frequencies, Lorentzian
linewidths and amplitudes we can form any relevant experimental spectrum using
a least square fit. This is illustrated for Gaussian and Lorentzian spectra,
Voigt profiles and box shapes. Eventually, the procedure is applied to an
experimental spectrum of a quantum dot superluminescent diode which determines
the first- and second-order temporal correlation functions of the emission. We
find good agreement with the experimental data and a quantized treatment. Thus,
a stochastic field represents broadband light emitted by quantum dot
superluminescent diodes.
