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. 02, 2004
Filed:
Apr. 23, 2002
Kiichi Hamamoto, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A semiconductor optical amplifier includes (a) a single-mode waveguide region which provides a single-mode to a guided light-wave, (b) a first multi-mode interference waveguide region which has a greater waveguide width than that of the single-mode waveguide region, is optically connected to the single-mode waveguide region, and provides a mode including a multi-mode, to the guided light-wave, and (c) a second multi-mode interference waveguide region which has a greater waveguide width than that of the first multi-mode interference waveguide region, is optically connected to the first multi-mode interference waveguide region, and provides a mode including a multi-mode, to the guided light-wave.