Chaos has the deterministic and unpredictable aspects useful for secure communications. Chaos encrypted optical signals provide high degree of security in free space as well as in optical fibers, but the effects of propagation through these mediums were not explored. In this paper, the evolution of Lyapunov exponent of optical chaos encrypted signal in optical fibers is studied. To study the effects of fiber channel, three different chaotic optical encryption schemes are studied and compared.

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Anjan K. Ghosh and Nirmal Patel, "Changes in the characteristics of chaotic optical signals owing to propagation in optical fibers," Proc. SPIE 11136, Optics and Photonics for Information Processing XIII, 111360S (Presented at SPIE Optical Engineering + Applications: August 14, 2019; Published: 6 September 2019); https://doi.org/10.1117/12.2529577.