Optical communications – Hybrid communication system
Reexamination Certificate
2006-01-31
2006-01-31
Epps, Georgia (Department: 2873)
Optical communications
Hybrid communication system
C398S163000, C359S237000, C250S2140RC
Reexamination Certificate
active
06993259
ABSTRACT:
The present electromagnetic signal sensing system includes a modulating circuit for generating an electrical modulating signal, a laser electrically connected to the modulating circuit, an optically modulated scatterer coupled with the laser, a receiving antenna, a synchronous detection circuit electrically connected to the receiving antenna and a signal processing circuit electrically connected to the synchronous detection circuit. The laser generates an optical modulating signal based on the electrical modulating signal for modulating the optically modulated scatterer to generate a modulated scattering signal. The receiving antenna receives the modulated scattering signal, the synchronous detection circuit generates an in-phase signal and a quadrature-phase signal with a phase offset of 90 degrees from the electrical modulating signal, and the signal processing circuit calculates the amplitude and phase of the electromagnetic signal from the in-phase signal and the quadrature-phase signal.
REFERENCES:
patent: 3300722 (1967-01-01), Iizuka
patent: 3470378 (1969-09-01), Mash et al.
patent: 4552151 (1985-11-01), Bolomey et al.
patent: 5430369 (1995-07-01), Bolomey et al.
patent: 6777659 (2004-08-01), Schwarte
Huang Ming Chieh
Liang Wen Lie
Shay Wen Tron
Dinh Jack
Epps Georgia
Industrial Technology Research Institute
Volentine Francos & Whitt PLLC
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