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. 12, 2003
Filed:
Mar. 01, 2000
Fujitsu Limited, Kawasaki, JP;
Abstract
In the case in which independent driving voltages are applied to electrodes that are provided in waveguides # and # of a Mach-Zehnder optical modulator, light passing through the waveguide # and light passing through the waveguide # undergo the same amount of phase modulation of opposite signs (positive and negative) while a driving voltage E is applied. Similarly, the Mach-Zehnder optical modulator is configured so that when a driving voltage E is applied, phase modulation provided to the light passing through the waveguide # and phase modulation provided to the light passing through the waveguide # are offset after these lights are coupled. With this configuration, the amount of phase modulation provided by the Mach-Zehnder optical modulator is always kept at “0”, resulting in that chirping, which is defined as the differentiation of a phase modulation amount with respect to time, does not occur. Therefore, deterioration caused by chirping in a waveform can be prevented.