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:
Apr. 05, 1994
Filed:
Dec. 06, 1991
Applicant:
Inventor:
Minoru Shikada, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04J / ;
U.S. Cl.
CPC ...
359125 ; 359114 ; 359173 ; 359191 ;
Abstract
Each subscriber is provided with an optical heterodyne detection circuit. An oscillation light of an optical local oscillator is divided to a local oscillation light for the heterodyne detection and a transmitting light for data communication. A channel for those lights is selected from vacant communication channels. The transmitting light may be obtained from a transmission light oscillator which is controlled by a control unit common to the optical local oscillator.