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:
Mar. 02, 2004
Filed:
Mar. 27, 2001
Keisuke Asami, Kanagawa, JP;
Ando Electric Co., Ltd., Kanagawa, JP;
Abstract
A light source for an external cavity laser comprises a semiconductor laser having a first facet to which is applied an antireflection coating A and a second facet to which is applied a increased reflection coating B defining a predetermined reflectivity, lenses a diffraction grating and a mirror wherein a light emitted from the first facet is converted into a parallel light by the lens and the parallel light passes through the diffraction grating to select a wavelength and is reflected to the diffraction grating by the mirror to select a wavelength via the diffraction grating again, and the parallel light is converged by the lens to be fed back to the semiconductor laser , and a light emitted from the second facets is converged by the lens to be output to an optical fiber