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. 10, 2001
Filed:
Sep. 28, 1999
Masayuki Shigematsu, Yokohama, JP;
Masayuki Nishimura, Yokohama, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A repeater station,detects whether or not an abnormality exists in each of signal light and monitor light having arrived from a terminal station,or a repeater station,, and controls, according to the result of detection, operations of optical amplifiers,and,and the monitor light. In the case where both of the signal light and monitor light arriving from the terminal station,via the optical transmission line for the downstream direction are abnormal, the optical amplifier,for the downstream direction stops its amplifying operation by itself, whereas a monitor control apparatus,stops the amplifying operation of the other optical amplifier for the upstream direction and also stops transmitting the monitor light to the terminal station,in the upstream direction.