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:
Jun. 11, 1991
Filed:
Mar. 01, 1989
Applicant:
Inventor:
David W Smith, Woodbridge, GB;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
455616 ; 455615 ; 455617 ;
Abstract
A digital transmission system and method for coherent optical systems in which a source signal is frequency modulated by digital information and caused to be incident on a birefringent medium. Moudulation signals are produced having a polarization which is dependent on the frequency of the source signal. The information can be regenerated by processing only one of the modulation signals and thus only one need be transmitted. Further modulation signals may be transmitted to enable error checking at the receiver.