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. 02, 2002
Filed:
Nov. 05, 1998
Applicant:
Inventors:
Takashi Sakata, Kawasaki, JP;
Takahiro Aramaki, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04J 1/400 ;
U.S. Cl.
CPC ...
H04J 1/400 ;
Abstract
The optical communication system employs PON system. An office device includes a pair of an optical transmitting/receiving devices. A subscriber line, which is a single core optical fiber, is connected to the optical transmitting/receiving devices at each terminal to form a loop network. Subscriber devices are connected to the network via passive optical branching/coupling elements. When the office device transmits a test signal, the subscriber devices transmit response signals corresponding to the test signal. The office device specifies fault point based on the response signals received by the optical transmitting/receiving devices.