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:
Nov. 17, 1992
Filed:
Aug. 02, 1991
Michael A Haase, Woodbury, MN (US);
David K Misemer, Maplewood, MN (US);
Minnesota Minning and Manufacturing Company, St. Paul, MN (US);
Abstract
A semiconductor heterojunction, guided-wave, electroabsorption modulator. The device includes a rib waveguide fabricated on a substrate. The waveguide includes a relatively thin and off-center undoped electroabsorbing layer within a light-guiding region. Electrodes configured for interconnection to an external voltage source produce an electric field within the waveguide. Heavily doped field confining layers on opposite sides of the electroabsorbing layer confine the electric field within the electroabsorbing layer to cause the electroabsorption of radiation in accordance with the Franz-Keldysh effect.