Proceedings of SPIE - the International Society for Optical Engineering
An optical encryption technique based on polarization property of light is proposed. Many techniques using polarization beam splitters to encrypt the signal have been proposed earlier. They are based on splitting and interference of two light signals, namely message and noise. Only by placing suitable mirrors and a second beam splitter in a suitable position, the two signals are reconstructed at the output. In this paper we report the fiber optic version of a polarization based encryption technique that also has the potential to double the data carrying capacity of the fiber. Using polarization dependent couplers in the fiber optic cables, we are able to achieve encryption of the light signal. Theoretical analysis and simulated results are also presented.
Murshid, S. H., Muralikrishnan, H. P., Tamilarasan, J., Chakravarty, A., & Caulfield, H. J. (2011). Optical encryption as a function of polarization in optical fiber communications. Paper presented at the Proceedings of SPIE - the International Society for Optical Engineering, 8054 doi:10.1117/12.884426