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:
Oct. 21, 1997
Filed:
Mar. 28, 1995
Tsukasa Takahashi, Sapporo, JP;
Hiroyuki Itou, Sapporo, JP;
Yuji Tamura, Sapporo, JP;
Michikazu Shima, Kawasaki, JP;
Kazuo Yamane, Kawasaki, JP;
Yumiko Kawasaki, Kawasaki, JP;
Keisuke Imai, Oyama, JP;
Yoshinori Ohkuma, Kawasaki, JP;
Kazuhiro Suzuki, Oyama, JP;
Yasunori Nagakubo, Kawasaki, JP;
Takashi Tsuda, Kawasaki, JP;
Yuji Miyaki, Oyama, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
The optical amplifier includes a doped fiber doped with a rare earth element, a pumping light source, means for introducing signal light and pumping light into the doped fiber, detection means for detecting whether or not amplified signal light is included in light outputted from the doped fiber, and means for decreasing the intensity of the pumping light when it is detected that amplified signal light is not included. It can be possible to eliminate an influence of an optical surge arising from a characteristic of the doped fiber.