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:
Apr. 23, 1996
Filed:
Jan. 17, 1995
Markus-Christian Amann, Baunatal, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
Tunable laser diode having an integrated Mach-Zehnder interferometer is provided. A first and a second waveguide are arranged vertically relative to one another with respect to the layer plane as stripe-shaped layers. The second waveguide extends over the entire resonator length between mirror end faces, whereas the first waveguide is only present in one or more interconnected sections provided as coupling region. The waveguides are arranged in such close proximity to one another in this coupling region that coupling occurs between modes guided in the waveguides. An active layer and a tuning layer are arranged vertically relative to one another in these waveguides. A separate current injection into this tuning layer and into this active layer are present, and an interconnected section of the waveguide not present over the entire resonator length is a respective, natural multiple of the coupling length of two specific modes in the waveguides to be coupled.