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:
Aug. 09, 2005
Filed:
Jul. 11, 2001
James N. Walpole, Concord, MA (US);
Joseph P. Donnelly, Carlisle, MA (US);
Stephen R. Chinn, Westford, MA (US);
James N. Walpole, Concord, MA (US);
Joseph P. Donnelly, Carlisle, MA (US);
Stephen R. Chinn, Westford, MA (US);
Massachusetts Institute of Technology, Cambridge, MA (US);
Abstract
A laser and optical amplifier waveguide device with a plurality of layers that supports a single lowest-order optical mode with gain while higher order modes radiate and have a net loss. The supported lowest-order mode which has gain, has a mode cross section which is large compared to the operating optical wavelength in both the transverse and lateral directions. The contours of constant optical intensity of such lowest-order can be nearly circular, having an approximately elliptical shape with a small aspect ratio.