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:
May. 22, 2001
Filed:
Feb. 17, 1999
Hitachi, Ltd., Tokyo, JP;
Abstract
An optical transmission apparatus, where the variation of optical wavelength due to temperature change is slight, and at the same time, the stray capacitance of an external modulator is reduced, and an optical integrated structure having a light source and the external modulator is mounted in a mechanically stable manner. The external modulator modulates output light from a semiconductor laser. The semiconductor laser is a front-end emission semiconductor laser that emits unmodulated light. The semiconductor laser and the modulator are monolithically integrated as an integrated structure. Control electrodes of the semiconductor laser and the modulator formed on a waveguide of the integrated structure are junction-down mounted via solder material to a laser-driving electrode and optical-modulator driving electrode separately formed on an optical mounting substrate.