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. 03, 1995
Filed:
Jan. 26, 1995
Applicant:
Inventor:
Toshiyuki Takeda, Tokyo, JP;
Assignee:
Ando Electric Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; H01S / ;
U.S. Cl.
CPC ...
359341 ; 359337 ; 372-6 ;
Abstract
In an optical amplifier a signal light of a wave length .lambda. a is coupled with a continuous light of a wave length .lambda. b and amplified by an optical fiber amplifier. Then, the amplified output light is subjected to filtration to select the light of the wave length .lambda. a alone, so that the ASE power is reduced and the dynamic range of the optical fiber amplifier from the minimum light receipt power to the saturation after amplification can be enlarged, and, in the case that the signal light is pulse-modulated, the deterioration of the extinction ratio is minimized.