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:
Nov. 10, 1987
Filed:
Jan. 31, 1984
Applicant:
Inventors:
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
455619 ; 455608 ;
Abstract
An optical heterodyne detection pulse receiving system operates such that the light from a local oscillator and from a pulse modulated optical carrier are mixed, and a signal having an intermediate (difference) frequency is extracted. Pulse signal regeneration is effected by demodulating the intermediate frequency signal while maintaining a positive integer multiple of one-half the intermediate frequency signal synchronized with the repeating frequency of the pulse signal.