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. 06, 2011
Filed:
Nov. 12, 2009
Akinori Hayakawa, Kawasaki, JP;
Ken Morito, Kawasaki, JP;
Akinori Hayakawa, Kawasaki, JP;
Ken Morito, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
Objects are achieved by an optical semiconductor device comprising: a structureincluding a substrate, a diffraction grating, an active layerand a refractive index control layer; and an laser elementincluding an electrodefor the active layer, an electrodefor the refractive index control layer and an electrodefor switching, wherein a pre-bias current is previously supplied from the electrodefor the active layer to the active layerin a state where a switching current is not supplied from the electrodefor switching to the active layer, and then while a current Ifor activation is supplied from the electrodefor the active layer to the active layer, the laser elementis turned on by supplying the switching current Ifrom the electrodefor switching to a part of the active layer, as well as turning off the laser elementby halting the supply of the switching current I.