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:
Jan. 12, 2021
Filed:
Jan. 09, 2020
Fujitsu Optical Components Limited, Kawasaki, JP;
Manabu Watanabe, Kawasaki, JP;
FUJITSU OPTICAL COMPONENTS LIMITED, Kawasaki, JP;
Abstract
A Mach-Zehnder optical modulator creates a first driving signal to be applied to a first section, and a second driving signal to be applied to a second section, and includes a generator, an optical modulator, and a setting unit. The generator generates a first dither signal and a second dither signal. The optical modulator optical modulates an optical signal into a quaternary or more value optical modulation signal by applying the first driving signal superimposed by the first dither signal, and by applying the second driving signal superposed by the second dither signal. The setting unit sets, when a length of the second section is n times as long as the first section, the first dither signal and the second dither signal to have a same phase, and sets such that an amplitude of the first dither signal is n times as large as that of the second dither signal.