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:
Jan. 09, 2001
Filed:
Oct. 16, 1998
Hiroji Masuda, Tokyo, JP;
Shingo Kawai, Tokyo, JP;
Kenichi Suzuki, Tokyo, JP;
Kazuo Aida, Tokyo, JP;
Abstract
An optical amplifier having a two-stage construction using an erbium doped fiber (EDF) as a gain medium. The erbium dopant concentration is 1000 ppm, and the unsaturated absorption coefficient of the signal beam at 1550 nm is 1 dB/m. The length of the EDF,-,is 10 m, and the length of the EDF,-,is 70 m. The excitation light sources,-,and,-,are semiconductor lasers of 1.53 &mgr;m, and the excitation light power is 100 mW. Multiplexers,-,and,-,are inductive multi-layer film filters, and the gain equalizer,-,is a Fourier filter. The peak loss of the Fourier filter is 17 dB. The gain of the EDF,-,is 25 dB, and the gain of the EDF,-,is 15 dB. Two optical isolators are installed on a pre-stage amplifier, and one on a post-stage amplifier in order to prevent laser oscillation.