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:
Oct. 23, 2001
Filed:
Nov. 01, 1999
Junichi Kinoshita, Kanagawa-Ken, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
In a guiding structure having a corrugation, depth of the corrugation is changed in the axial direction to change the effective refractive index by a considerable amount. The use of a 2nd-order or higher-order corrugation is desirable to ensure precise processing. It is also desirable that changes in depth is continuous. In a DFB laser using this structure, effective phase shifting and optical confinement factor can be controlled by changing the depth of the corrugation. In a DFB laser/modulator integrating device commonly using an active layer and an absorption layer, changes of the corrugation in the axial direction, including the presence or absence thereof, can considerably change optical confinement factor to the absorption layer and the active layer.