Optical encryption as a function of polarization in optical fiber communications

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.

[1]  Syed H. Murshid,et al.  Experimental results from copropagating analog channels of same wavelength over 600-meter-long standard step index multimode fiber , 2008 .

[2]  B. Javidi,et al.  Encrypted optical storage with wavelength-key and random phase codes. , 1999, Applied optics.

[3]  Syed H. Murshid,et al.  Spatially multiplexed beam combining and beam separator modules for optical communication bandwidth enhancement , 2008 .

[4]  Osamu Matoba,et al.  Secure holographic memory by double-random polarization encryption. , 2004, Applied optics.

[5]  Whitfield Diffie,et al.  New Directions in Cryptography , 1976, IEEE Trans. Inf. Theory.

[6]  Bostjan Batagelj,et al.  Fiber interferometric communications using mach-zehnder interferometer topology , 2009, IEEE EUROCON 2009.

[7]  Syed H. Murshid,et al.  Attenuation and modal dispersion models for spatially multiplexed co-propagating helical optical channels in step index fibers , 2011 .

[8]  J. Bechtle,et al.  S-matrix representation of polarisation dependent fibre optic couplers for the simulation of optical networks , 2005, Proceedings of 2005 IEEE/LEOS Workshop on Fibres and Optical Passive Components, 2005..

[9]  Barry G. Grossman,et al.  Spatial domain multiplexing: A new dimension in fiber optic multiplexing , 2008 .

[10]  Zeev Zalevsky,et al.  Entanglement based Optical Transient Encryption , 2010 .

[11]  Bahram Javidi,et al.  Polarization encoding for optical security systems , 2000 .

[12]  Syed H. Murshid,et al.  Concentric octagonal CMOS photodiodes for direct detection of spatially multiplexed optical fiber channels , 2008 .