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8 December 2004 Chaotic optical data encryption using external-cavity VCSELs
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Optical synchronisation of chaos in unidirectionally coupled external cavity vertical-cavity surface-emitting semiconductor lasers (VCSELs) has been experimentally achieved. The polarisation of the injected beam is perpendicular to that of the free-running receiver (x-polarisation). Normal (positive-slope) synchronisation is observed between the injected beam and the y-polarized component of the receiver. However, due to the anti-phase dynamics of the receiver, an inverse (negative-slope) synchronisation is found between the injected beam and the x-polarized component of the receiver. A 200 MHz message has been successfully encoded in an external-cavity VCSEL transmitter and decoded in a receiver. Message recovery has been achieved with about 9 dB signal-to-noise ratio.
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Yanhua Hong, Min Won Lee, and K. Alan Shore "Chaotic optical data encryption using external-cavity VCSELs", Proc. SPIE 5614, Advanced Free-Space Optical Communications Techniques and Technologies, (8 December 2004);

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