The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 27, 2010
Filed:
Aug. 24, 2005
Mihaela Dinu, Freehold, NJ (US);
Christophe J. Dorrer, Matawan, NJ (US);
Clinton Randy Giles, Whippany, NJ (US);
Inuk Kang, Eatontown, NJ (US);
Dan Mark Marom, Howell, NJ (US);
Mihaela Dinu, Freehold, NJ (US);
Christophe J. Dorrer, Matawan, NJ (US);
Clinton Randy Giles, Whippany, NJ (US);
Inuk Kang, Eatontown, NJ (US);
Dan Mark Marom, Howell, NJ (US);
Alcatel-Lucent USA Inc., Murray Hill, NJ (US);
Abstract
A communication system adapted to use wavelength (frequency) division multiplexing for quantum-key distribution (QKD) and having a transmitter coupled to a receiver via a transmission link. In one embodiment, the receiver is adapted to (i) phase-shift a local oscillator (LO) signal generated at the receiver, (ii) combine the LO signal with a quantum-information (QI) signal received via the transmission link from the transmitter to produce interference signals, (iii) measure an intensity difference for these interference signals, and (iv) phase-lock the LO signal to the QI signal based on the measurement result. In one configuration, the QI signal has a plurality of pilot frequency components, each carrying a training signal, and a plurality of QKD frequency components, each carrying quantum key data. Advantageously, the system can maintain a phase lock for the QKD frequency components of the QI and LO signals, while the QKD frequency components of the QI signal continuously carry quantum key data.