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. 26, 2013
Filed:
Mar. 06, 2009
Satoshi Oikawa, Chiyoda-ku, JP;
Katsutoshi Kondou, Chiyoda-ku, JP;
Masayuki Ichioka, Chiyoda-ku, JP;
Satoshi Oikawa, Chiyoda-ku, JP;
Katsutoshi Kondou, Chiyoda-ku, JP;
Masayuki Ichioka, Chiyoda-ku, JP;
Sumitomo Osaka Cement Co., Ltd., Tokyo, JP;
Abstract
It is intended to suppress the influence of a photorefractive phenomenon or the coupling of stray light to signal light. A Mach-Zehnder waveguide type optical modulator is provided which includes a thin platewith a thickness of 20 μm or less formed of a material having an electro-optical effect, an optical waveguideformed on a front surface or a rear surface of the thin plate, and a modulation electrode modulating light passing through the optical waveguide. The optical waveguide includes an input optical waveguide, branched optical waveguidesto, and an output optical waveguide. The branched optical waveguide includes an input branching portion (region B) in which the input optical waveguide is branched into a plurality of optical waveguides, an output merging portion (region D) in which the plurality of optical waveguides connected to the output optical waveguide are merged, and a parallel portion (region C) formed between the input branching portion and the output merging portion. At least one of the input branching portion and the output merging portion has a ratio l/d of a length l along a symmetry axis of the branched optical waveguides to a gap d of the optical waveguide in the parallel portion in the range of 33 to 100.