Abstract
We propose a power spectrum analysis method to directly identify the time
delay of a chaotic semiconductor laser with optical feedback. By measuring the radio
frequency (RF) power spectrum of the chaotic laser and performing an inverse Fourier
transform, we can easily unveil all the time delay signatures, regardless of whether
the chaotic output is induced by single or multiple feedback. This method
successfully retrieves the two time delay signatures from the power spectrum of a
semiconductor laser with double-cavity feedback.
© 2012 Chinese Optics Letters
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