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. 30, 1991
Filed:
May. 24, 1990
Christian Tanguy, Saint-Michel, FR;
Guy Mesquida, Forges Les Bains, FR;
Gerard-Maurice Marquebielle, Sainte Genevieve des Bois, FR;
Thomson Hybrides, Puteaux, FR;
Abstract
The disclosure concerns semiconductor lasers in which the current has to be localized, preferably in the emissive strip. In a laser having at least one emissive strip and a contact for current injection, the current is localized on the strip by means of an overdoped well that goes through the confinement layer with doping gradient. This confinement layer is doped to a level of 10.sup.18 at.cm.sup.-3 in the vicinity of the strip and to a level of 2.10.sup.17 at.cm.sup.-3 in the vicinity of the injection contact. The disclosed device can be applied to telecommunications and data processing by optical fibers.