19 September 2014 Optical chaos synchronization and encrypted communications of VCSEL by direct optical injection
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Abstract
In this work, we propose electro-optical nonlinear delayed feedback systems (NDFS) for optical secure communications using VCSEL for the first time. Its optical output can perform more sensitive chaotic dynamics by varying only a few mA of injection current range resulting in very significant charges of VCSEL’s operation conditions from threshold to maximum rating. This enables us to vary chaotic output dynamically by a slight difference of initial values in NDFS. We have proposed a chaos synchronization system using two identical NDFS’s of VCSEL, and realized chaos synchronization by optical injection. As a result of experiment the correlation coefficient up to about 0.88 was obtained. Moreover, by varying the delay time and feedback gain in the parameters of NDFSs, we have confirmed that the variations of these parameters may affect variations of correlation.
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Naohito Hosomi, Wakao Sasaki, "Optical chaos synchronization and encrypted communications of VCSEL by direct optical injection", Proc. SPIE 9216, Optics and Photonics for Information Processing VIII, 92160P (19 September 2014); doi: 10.1117/12.2060689; https://doi.org/10.1117/12.2060689
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