Communication system with external synchronisation

Details Communication system with external synchronisation Communication system with external synchronisation

2004-05-05

2008-12-02

Assaf, Fayez G (Department: 2872)

Optical communications

Optical communication over freee space

Transceivers

C398S130000

Reexamination Certificate

active

07460787

ABSTRACT:
In an optical communication method, an accurate common clock signal (GPS) is provided to a sender (10) and a receiver (20). In the sender, the common clock signal is received, a first clock signal (CLK1) is generated on the basis of said common clock signal, a carrier wave with a predetermined carrier frequency (f) is generated using said clock signal as timing reference, the carrier wave is modulated with a data signal, and the modulated carrier wave is transmitted using a light beam (13). In the receiver, the common clock signal is received, a reference signal having the same frequency (f) as the carrier frequency is generated on the basis of said common clock signal, said optical beam (13) is received, a detection signal is derived from the optical beam, the receiver is tuned to the predetermined carrier frequency (f), and the data signal is derived from the detection signal.

REFERENCES:
patent: 2002/0045434 (2002-04-01), Masoian
patent: 0582998 (1994-02-01), None
patent: 0004660 (2000-01-01), None
patent: 0025456 (2000-05-01), None

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