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. 21, 2002
Filed:
Nov. 20, 1998
Soo-young Yoon, Yongin, KR;
Seong-taek Hwang, Pyeongtaek, KR;
Lars Johan Albinsson Nilsson, Suwon, KR;
Jeong-mee Kim, Yongin, KR;
Sung-jun Kim, Pyeongtaek, KR;
Rae-sung Jung, Yongin, KR;
SamSung Electronics Co., Ltd., Suwon, KR;
Abstract
An optical fiber amplifier including a first optical fiber doped with erbium and phosphorous, for amplifying signal light excited by the erbium, a second optical fiber connected to one end of the first optical fiber, doped with erbium and aluminum, and having a gain spectrum slope opposite to the first optical fiber according to population inversion of the erbium, for amplifying signal light output by the first optical fiber, a pumping laser source connected to another end of the first optical fiber, for exciting the erbium of the first and second optical fibers, and a light coupler for coupling pumping light from the pumping laser source to the signal light and outputting the resultant light to the first optical fiber. Two types of EDFs (erbium doped fibers) having different gain spectrums are used, such that the gain spectrum of each of the EDFs actively varies with the input signal light power or pumping light power. Thus, an entirely flat gain is kept.