Optical countermeasures and security of free-space optical communication links

Vladimir G. Sidorovich

doi:10.1117/12.565348

8 December 2004 Optical countermeasures and security of free-space optical communication links

Vladimir G. Sidorovich

Proceedings Volume 5614, Advanced Free-Space Optical Communications Techniques and Technologies; (2004) https://doi.org/10.1117/12.565348
Event: European Symposium on Optics and Photonics for Defence and Security, 2004, London, United Kingdom

Abstract

Information transmitted by free-space optical (FSO) communication systems is generally well protected from unauthorized access (eavesdropping) by narrow divergence of laser beams and absence of narrow-band (about 20 nm) optical filters tunable within a wide wavelength range. However, in certain circumstances such an access is still possible, due to the fact, that part of the communication beam radiation is reflected and/or scattered by solid objects within the beam, dust and/or water droplets on window panes, and particles of atmospheric aerosol. If the wavelength is known a priory, and if specially designed equipment is used, detection and eavesdropping may be implemented under some specific conditions at distances up to several hundred meters. Recommendations are presented on measures that should be taken to prevent unauthorized access to FSO communication links.

Citation Download Citation

Vladimir G. Sidorovich "Optical countermeasures and security of free-space optical communication links", Proc. SPIE 5614, Advanced Free-Space Optical Communications Techniques and Technologies, (8 December 2004); https://doi.org/10.1117/12.565348

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