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:
Aug. 24, 2004
Filed:
Jul. 19, 2002
Kouichi Uesaka, Kawasaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A Mach-Zehnder optical modulator that can attain a higher transmission speed than the driver signal speed but also attains, by setting multi-value amplitudes, an information transmission volume corresponding to an integer multiple of a single driver while allowing the transmission speed to remain as it is, wherein plural optical waveguide branches and plural Mach-Zehnder modulator portions are used, and by utilizing a propagation delay of a modulation signal for driving each of the modulator portions there is attained a transmission speed proportional to the delay time. This leads to a transmission signal having a frequency higher than the cut-off frequency of, for example, an IC or a transmission line substrate having an electrical characteristic of generating and propagating a modulation signal in such a form as an optical MUX (multiplexer).