Title :
Double security level in a telecommunication system based on phase coding and false data transmission
Author :
Wacogne, Bruno ; Jackson, Mark D. ; Fisher, Norman E. ; Podoleanu, Adrian ; Jackson, David A.
Author_Institution :
Dept. of Phys., Kent Univ., Canterbury, UK
fDate :
5/1/1996 12:00:00 AM
Abstract :
A new communication system exhibiting a double security level is demonstrated. Information coding is based on relative phase changes between consecutive time intervals of the light emitted from a highly coherent CW source. An imbalanced Mach-Zehnder interferometer whose time delay matches the intervals duration is used to decode the data. The first security level is related to the constant optical power in the transmission link. To further enhance the security, a low coherent source is used to send false data down the transmission link. Common mode rejection is used to separate the real signal from the false signal. This system provides a high signal-to-noise ratio as well as a low crosstalk in a wavelength division multiplexing network
Keywords :
Mach-Zehnder interferometers; data communication; decoding; delays; encoding; light coherence; optical crosstalk; optical fibre networks; optical noise; security of data; wavelength division multiplexing; WDM transmission link optical fibre network; common mode rejection; communication system; consecutive time intervals; constant optical power; data decoding; double security level; false data; false data transmission; false signal; first security level; high signal-to-noise ratio; highly coherent CW source; imbalanced Mach-Zehnder interferometer; information coding; low coherent source; low crosstalk; phase coding; real signal; relative phase changes; telecommunication system; time delay; Communication system security; Data security; Decoding; Delay effects; Information security; Optical crosstalk; Optical interferometry; Power system security; Signal to noise ratio; Stimulated emission;
Journal_Title :
Lightwave Technology, Journal of
