Cryptography – Communication system using cryptography – Fiber optic network
Reexamination Certificate
2011-01-11
2011-01-11
Korzuch, William R (Department: 2431)
Cryptography
Communication system using cryptography
Fiber optic network
C380S255000, C380S263000, C356S450000
Reexamination Certificate
active
07869599
ABSTRACT:
A quantum cryptography key distributing system includes an optical fiber; a transmission unit and a reception unit. The transmission unit is connected with the optical fiber, generates a transmission optical pulse signal from an optical pulse signal based on a first data in synchronism with an optical clock signal and transmits the transmission optical pulse signal to the reception unit via the optical fiber. Polarization of the transmission optical pulse signal is different from that of the optical pulse signal. The reception unit is connected with the optical fiber, transmits the optical pulse signal to the transmission unit via the optical fiber, phase-modulates a part of the transmission optical pulse signal based on a second data in synchronism with the optical clock signal, and detects a reception data corresponding to the first data based on the transmission optical pulse signal in synchronism with the optical clock signal.
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Korzuch William R
NEC Corporation
Su Sarah
Young & Thompson
LandOfFree
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