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:
Feb. 14, 1995
Filed:
Jan. 05, 1994
Applicant:
Inventor:
Daryoosh Vakhshoori, Chatham Township, Morris County, NJ (US);
Assignee:
AT&T Corp., Murray Hill, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 45 ; 372 27 ;
Abstract
The output of vertical cavity surface emitting layers (VC-SELs) generally lacks polarization stability due to polarization mode degeneracity. I have discovered that in the usual (001) laser geometry polarization mode degeneracity can be removed if the active region of the laser is selected such that the active region lacks mirror symmetry with respect to any plane normal to the [001] crystal direction. Exemplarily, the active region comprises one or more asymmetrical quantum wells, e.g., quantum wells having a saw-tooth profile. The invention can also be embodied in edge emitting lasers, but embodiment in VC-SELs is preferred.