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:
May. 06, 2008
Filed:
Nov. 16, 1999
Kiyoshi Sukegawa, Kawasaki, JP;
Yasuhiro Ono, Kawasaki, JP;
Kiyoshi Sukegawa, Kawasaki, JP;
Yasuhiro Ono, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A transmission line monitoring apparatus includes a first optical coupling unit, a first optical dividing unit, a second optical coupling unit, a second optical dividing unit and a monitoring unit. The first optical coupling unit couples a down data signal with a first wavelength and an examination signal with a second wavelength into a first coupled signal. The first optical dividing unit receives the first coupled signal and divides the first coupled signal into the down data signal with the first wavelength and the examination signal with the second wavelength. The second optical coupling unit couples an up data signal with the first wavelength and the examination signal from the first optical dividing unit into a second coupled signal. The second optical dividing unit receives the second coupled signal and divides the second coupled signal into the up data signal with the first wavelength and the examination signal with the second wavelength. The monitoring unit monitors a fault and a position of the fault.