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:
Jul. 14, 1992
Filed:
Jul. 27, 1990
Mitsuo Kitamura, Kawasaki, JP;
Katsumi Kikawa, Ichikawa, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An optical repeater provided in an up line and a down line, the optical repeater includes a first circuit related to the up line, and a second circuit related to the down line. Each circuit includes an optical receive/decision circuit, a command extraction circuit, a command detection circuit, a command switch and a supervisory circuit. Each circuit also includes a noise component processing circuit which extracts, from the electrical signal, a noise component within a predetermined frequency range excluding a frequency of the command signal and determines whether or not the optical signal is input to the optical receive/decision circuit on the basis of the noise component and which prevents the noise component passing through the command extracting circuit from being directly applied to the command detecting circuit when it is determined that no the optical input is input to the optical receive/decision circuit. Each circuit further includes an output circuit which converts the data signal and a supervisory signal into an optical output which is transferred to a corresponding one of the up line and the down line.