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. 10, 1994
Filed:
Feb. 05, 1993
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In an optical filter to be used for signal selection, removal of noise, equalizing the wavelength of signal light, etc. in an optical communication system, optical measurement device or the like, and in an optical amplifier employing such optical filter, signal light is dispersed at different angles according to each wavelength by a diffraction grating and the dispersed light is selectively transmitted or reflected by a transmission type spatial filter or reflection type spatial filter, and is then coupled with an output fiber bundle as non-dispersed light by the diffraction grating. Thus, the optical filter has variable wavelength pass band characteristics and the optical amplifier possesses a uniform wavelength amplification factor.