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:
Apr. 01, 2014
Filed:
Aug. 10, 2012
Michael Robertson, Ipswich, GB;
Xin Chen, Ipswich, GB;
Paul Cannard, Ipswich, GB;
The Centre for Integrated Photonics Limited, Ipswitch, GB;
Abstract
An optical amplifier has a low polarization dependent gain. The amplifier includes a gain medium including a plurality of adjoining semiconductor layers to provide optical gain wherein the adjoining semiconductor layers define one or more quantum wells for electrons and are operative to provide both direct and indirect electron-hole transitions in the gain medium. A first quantized electron energy level in the conduction band and a first quantized hole energy level in the valence band is located in a first layer. A further first quantized hole energy level in the valence band is located in an adjacent second layer.