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:
Jan. 06, 1997
Filed:
Jan. 27, 1993
Alan D Kersey, Fairfax Station, VA (US);
Anthony Dandridge, Burke, VA (US);
Abstract
A code-division multiplexed system comprising an optical source, a code generator for developing and applying a pseudo-random bit sequence code to the optical source to cause the optical source to develop a unipolar coded optical signal, a means for dividing the unipolar coded optical signal into N optical paths separated from each other by associated successive integer multiples of a bit period T of delay, N information signal sources responsive to the unipolar coded optical signals for selectively producing N differently-delayed optical information signals, a means for combining the N differently-delayed optical information signals into an output optical signal comprised of an intensity sum of the overlapping N differently-delayed optical unipolar information signals, a photodetector responsive to the output optical signal for developing an input electrical signal corresponding to the sum of N overlapping unipolar optical signals, an adjustable delay circuit responsive to the pseudo-random bit sequence code for producing a desired bipolar reference code corresponding to the delay associated with an associated desired one of the N differently-delayed optical information signals, and a correlation circuit responsive to the input electrical signal and to the desired bipolar reference code for synchronously correlating the desired bipolar reference code with the input electrical signal to extract a desired electrical signal corresponding to the desired one of the N differently-delayed optical information signals and to substantially suppress any other electrical signal that is asynchronously aligned with the desired bipolar reference code.