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:
Sep. 01, 1998
Filed:
Jun. 27, 1996
Kenichi Yoneyama, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
An optical fiber amplifier including, in addition to an amplification medium for amplifying signal light, an excitation light source which generates excitation light to be input into the amplification medium and a photocoupler for coupling the excitation light to the amplification medium, a modulator for amplitude the excitation light, a sub-signal generator for generating a sub-signal which is superimposed on the excitation light for amplitude modulation and a frequency filter for converting the frequency characteristic of the sub-signal to input it to the the modulator means, for superimposing the sub-signal due to change in gain of the amplification medium for intensity modulation of the excitation light. High-frequency components of the sub-signal are previously emphasized through the frequency filter, and the excitation light is amplitude-modulated by the sub-signal with the emphasized high-frequency components, to superimpose the satisfactory, waveform distortion-free sub-signal on the signal light.