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:
Sep. 16, 2003
Filed:
Oct. 02, 2000
Hideki Okuno, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
An optical fiber amplifying apparatus is provided with an optical fiber for amplifying input signal lights, a heating/cooling element for heating or cooling the optical fiber, and a temperature control circuit for controlling the element. The circuit effects control so as to keep the optical fiber at a prescribed temperature on the basis of the output of a temperature sensor. The circuit also controls the heating/cooling element so as to keep the level(s) of at least one signal light extracted out of wavelength-multiplex signal lights at a prescribed value. The circuit can compute the gain from the input and output levels of one or more signal lights, and control the element so as to keep this gain within a prescribed range.