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:
Aug. 20, 1991
Filed:
Nov. 16, 1988
James H Cole, Great Falls, VA (US);
Ira J Bush, Los Angeles, CA (US);
Dylor Corporation, Chantilly, VA (US);
Abstract
A method and apparatus is provided for transmitting a broad dynamic range of rf or microwave signals from a source of such signals, e.g., an antenna, to a remotely located receiver, e.g., a television or radar receiver, by phase modulating a beam of light, transmitting the modulated optical signal over a substantial distance using fiber optics, detecting and demodulating the optical signal to recover the rf or microwave analog signal, and using the recovered signal at the output receiver. Conversion of the analog information into a modulated optical signal is obtained by employing interferometers and placement of the modulated signals in quadrature to linearize the output. Apparatus using the method to distribute rf or microwave analog information to a plurality of remotely located receivers is taught as is apparatus for bidirectional movement of rf or microwave analog signals using the modulation techniques of the method from at least two sources of analog signals which are remoted from each other.