Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1995-12-13
1998-01-20
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359168, 359173, 359188, H04B 1012, H04B 10142
Patent
active
057106517
ABSTRACT:
The transmitter or receiver of the remote antenna system of the present invention includes a fiber optic link connecting the receiver or transmitter station with a remote antenna station. The optical carrier for the fiber optic link is produced by a dual optical signal generator, preferably in the form of two narrow-linewidth lasers frequency offset by a difference frequency corresponding to the millimeter-wave or microwave signal. If the invention is employed to convey a baseband signal from the transmitter station to the antenna station, a modulator at the transmitter station modulates the dual optical signal carrier with the baseband signal. The modulated signal is carried over the optical fiber to a photodetector at the remote antenna station which detects the millimeter wave difference frequency modulated by the baseband signal. If the invention is employed to convey a received millimeter wave signal from the remote antenna station to the receiver station, then a modulator at the remote antenna station modulates the dual optical signal carrier with the received millimeter wave signal. The modulated signal is carried over the optical fiber to a photodiode at the receiver station which detects the baseband contained in the millimeter wave signal.
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California Institute of Technology
Pascal Leslie
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