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. 21, 2001
Filed:
May. 21, 1999
Federico Capasso, Westfield, NJ (US);
Alfred Yi Cho, Summit, NJ (US);
Claire F. Gmachl, Millburn, NJ (US);
Albert Lee Hutchinson, Piscataway, NJ (US);
Deborah Lee Sivco, Warren, NJ (US);
Alessandro Tredicucci, Summit, NJ (US);
Lucent Technologies, Inc., Murray Hill, NJ (US);
Abstract
A bi-directional semiconductor light source is formed that provides emission in response to either a positive or negative bias voltage. In a preferred embodiment with an asymmetric injector region in a cascade structure, the device will emit at a first wavelength (&lgr;,) under a negative bias and a second wavelength (&lgr;,) under a positive bias. In other embodiments, the utilization of an asymmetric injector region can be used to provide a light source with two different power levels, or operating voltages, as a function of the bias polarity.