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:
Mar. 07, 2006
Filed:
Jun. 06, 2003
Kiyoaki Takashina, Tokyo, JP;
Toshio Kawazawa, Tokyo, JP;
Koji Goto, Tokyo, JP;
KDDI Submarine Cable Systems Inc., Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
To control a gain profile in an optical fiber line to become a desirable form, a C-OTDR measuring apparatus () outputs a probe pulse light having a wavelength λm for an optical fiber line (). A power level on the input or output side of a variable gain equalizer () can be measured according to a C-OTDR waveform of a return light of the probe pulse light entered through a C-OTDR path () and an optical fiber line (). By sweeping the measurement wavelength λm, the gain file is measured. The equalizing characteristics of the variable gain equalizer () are remotely controlled so that the gain profile becomes a desirable form according to the measured result.