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:
Dec. 20, 2005
Filed:
Sep. 05, 2002
Yasunori Miyazaki, Tokyo, JP;
Yasunori Miyazaki, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical modulator with lowered chirping without deterioration of extinction characteristic. An intermediate layer is interposed between a well layer and an n-side barrier layer and tensile strain is produced in the well layer. A relationship Ew<Em<Eb is established between a band gap energy Eb (eV) of the barrier layer, the band gap energy Ew (eV) of the well layer, and the band gap energy Em (eV) of the intermediate layer. Another type of tensile strain quantum well structure having four kinds of layers may be employed by adding another layer to the tensile strain quantum well structure having three layers. The band gap energy of an additional layer is between the band gap energies of the well layer and the intermediate layer or between the band gap energies of the intermediate layer and the barrier layer.