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. 15, 1997
Filed:
Sep. 28, 1994
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A semiconductor optical modulator includes an active region including a multi quantum well structure. Thereby, it is possible to absorb laser light having two polarization wave modes to a high degree as well as increase the number of quantum wells without fracturing the crystal, thereby providing a modulator having no polarization plane dependency and an increased extinction ratio. Further, a plurality of electrodes, each having an aperture, are provided at an upper surface and an electrode having the same number of apertures as on the upper surface is provided at a lower surface opposite the other electrodes. Multiple laser light beams incident from the apertures at the upper surface are respectively modulated and output from the apertures at the opposing lower surface. Therefore, in the active region, laser light beams including both TE and TM modes are absorbed or transmitted by the modulator without dependency on their respective polarization planes.