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:
Mar. 15, 2022
Filed:
Apr. 18, 2019
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo, JP;
Abstract
A Mach-Zehnder modulator is enabled to perform high-speed modulation operation by reducing RF loss of a high-frequency wiring formed on an optical waveguide without deteriorating optical characteristics of branching and multiplexing optical circuits. The Mach-Zehnder modulator includes a Mach-Zehnder (MZ) optical waveguide including two arm waveguides, a 1×2 multimode interference coupler composed of a semiconductor that splits and distributes input light to the two arm waveguides, a 2×1 multimode interference coupler composed of a semiconductor that multiplexes light from the two arm waveguides, and phase modulation means for giving a phase difference to the light that propagates through the two arm waveguides, wherein the 1×2 multimode interference coupler and the 2×1 multimode interference coupler are formed in a high-mesa structure, and higher mode light radiation means for radiating higher mode light is connected to only the 2×1 multimode interference coupler among the two multimode interference couplers.