An improved method of distinguishing chaotic signal based on Wigner distribution (WD) is presented. Except for the
width of spectrum, the peak values speciality of time-frequency in 3-dimensional figure is employed to distinguish
chaotic signal. The method is verified by Lorenz system. The Wigner distribution of the chaotic signal is compared with
that of the gauss noise, and the result dedicated that the spectrums of them can be distinguished. The Wigner distribution
is used to dispose the chaotic signal of the fiber ring laser base on Semiconductor Optical Amplifier (SOA) too, and the
result is consistent with that of Lorenz system. In the conclusion, 3-dimensional WD distribution could more accurately
show chaos spectrum characteristic and could be an effective method for distinguishing the chaos and other signals.
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