Optical communication system with secure key transfer

Details Optical communication system with secure key transfer Optical communication system with secure key transfer

1995-04-03

1996-10-22

Chin, Wellington

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359152, 380 54, H04J 1408

Patent

active

055683010

ABSTRACT:
An optical communication system includes a first and a second optical communication assembly that are coupled together via an optical coupling medium. Each optical communication assembly includes a respective time delay unit; an optical pattern imager coupled to the time delay unit; a respective transmission-reception apparatus coupled to the time delay unit; and a respective optical signal generator coupled to the time delay unit for passing a pulse of coherent light into the time delay unit. The optical pattern imager in each optical communications assembly is disposed to receive an interference fringe pattern that corresponds to the respective phase shifts introduced by both the transmitting and receiving optical communications assemblies. The position of the interference pattern with respect to a reference standard on the imager provides a signal for a code-key data signal.

REFERENCES:
patent: 5164986 (1992-11-01), Bright
patent: 5410147 (1995-04-01), Riza et al.
Amer A. Hassan et al., "Spatial Optical CDMA", IEEE Journal on Selected Areas in Communications, vol. 13, No. 3, Apr. 1995, pp. 609-613.
Nabeel A. Riza et al., "Signaling System for Multiple-Access Laser Communications and Interference Protection", Applied Optics, vol. 32, No. 11, 10 Apr. 1993, pp. 1965-1972.
Townsend et al, "Design of quantum cryptgraph systems for passive optical networks", Electronics Letters vol. 30, No. 22, 27th Oct. 1994. pp. 1875-1877.
Townsend, "Sewre key distribution system based on quantum cryptograhy", Electronics Letters, 12th May 1994, vol. 30, No. 10. pp. 809-811.

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