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. 03, 1987
Filed:
Nov. 12, 1986
Applicant:
Inventor:
Minoru Shikada, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B / ;
U.S. Cl.
CPC ...
455606 ; 455612 ; 455617 ;
Abstract
In a bidirectional optical communication system, an optical combiner is included to function not only as a combiner in which receiving signal light and local oscillator light are combined to produce an intermediate frequency signal but also as a divider in which the receiving signal light and transmitting signal light are divided so that parts to be used are decreased in number thereby decreasing the manufacturing cost and size thereof.