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:
Jun. 28, 1994
Filed:
Sep. 30, 1991
NEC Corporation, Tokyo, JP;
Abstract
In order to induce a flat frequency modulation response in a multi-electrode semiconductor laser which includes an active region and at least one phase control region with no active layer, a modulation current is applied to both of the active region and the phase control region. Further, an improved electrode arrangement for inducing a flat frequency modulation response in a multi-electrode semiconductor laser is present. The semiconductor laser includes three regions: an active region, a phase control region and a Bragg reflector region. Each of the active region, the phase control region and the Bragg reflector region being provided with an electrode for receiving an injection current, wherein the electrode provided for the active layer extends into the phase control region.