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:
Jul. 28, 2009
Filed:
May. 09, 2008
Mathieu Carras, Gentilly, FR;
Alfredo DE Rossi, Paris, FR;
Mathieu Carras, Gentilly, FR;
Alfredo De Rossi, Paris, FR;
Thales, , FR;
Abstract
The present invention relates to a strong distributed feedback semiconductor laser. More specifically, the invention implements a top optical waveguide () for semiconductor lasers having a surface metallic grating () making it possible to obtain a stable and controlled distributed feedback, using a simple and robust technology. In the inventive laser, which comprises an active area () having an effective refractive index (neff) in which a light wave is propagated with a wavelength (λ), the top waveguide () is made of a weakly-doped material and the periodic grating () depth (p) is plus or minus 50%, the low precision needed being one of the advantages of the inventive laser.