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. 23, 1996
Filed:
Mar. 21, 1995
Mizuyuki Ushirozawa, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
In a method of monitoring an optical amplifier in an optical communication system, an optical signal is optically amplified in response to a drive current by an optical amplifier which includes at least one optically active element and a group of optically passive elements including a rare earth element doped optical fiber. The intensity of light emitted from the optically active element is monitored to generate a first monitor signal indicative of the intensity of light emitted from the optically active element. Also, the optical fiber is monitored for an optical amplification of the optical amplifier. The drive current is supplied to the optical amplifier based on the second monitor signal. The states of the optically active element and the group of optically passive elements are determined based on the first monitor signal and a second monitor signal corresponding to the drive current.