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:
Oct. 18, 1994
Filed:
Apr. 21, 1993
Anne Talneau, Paris, FR;
Josette Charil, Meudon, FR;
France Telecom, Paris, FR;
Abstract
A distributed feedback semiconductor laser structure of the type having a guidance zone providing lateral guidance by refractive index variation, including a phase-shifting diffraction grating extending between two end regions along a light propagation direction, for obtaining coupling within the structure between light propagating in one direction and light propagating in the opposite direction. The diffraction grating is adapted to implement coupling of varying amplitude along the structure between said end regions, and the width of said guidance zone varies such that the phase shift induced by said variation in width compensates for the phase shift induced by the variation in the coupling amplitude.
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