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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.:

US 9069224 B1

PDFFull Text
Expired
Date of Patent:
Jun. 30, 2015

Filed:

Nov. 14, 2014

Optical modulator and optical modulation control method

Applicant:

Fujitsu Optical Components Limited, Kawasaki-shi, Kanagawa, JP;

Inventors:

Hiroshi Nishimoto, Kawasaki, JP;

Hiroshi Kuwahara, Kawasaki, JP;

Assignee:

FUJITSU OPTICAL COMPONENTS LIMITED, Kawasaki, JP;

Attorney:

Staas & Halsey LLP

Primary Examiner:

Ken Vanderpuye

Assistant Examiner:

Abbas H Alagheband

Int. Cl.
CPC ...
H04J 14/02 (2006.01); H04B 10/04 (2006.01); H04J 14/08 (2006.01); H04B 10/02 (2006.01); H04J 14/06 (2006.01); G02F 1/295 (2006.01); G02F 1/225 (2006.01); H04B 10/50 (2013.01); G02F 1/01 (2006.01); G02F 1/21 (2006.01);
U.S. Cl.
CPC ...
G02F 1/2257 (2013.01); H04B 10/50572 (2013.01); H04B 10/50575 (2013.01); G02F 2001/212 (2013.01); G02F 1/0123 (2013.01);
Abstract

An optical modulator includes: a modulator including an optical waveguide provided in a semiconductor substrate having an electro-optical effect and an electrode to apply an electric field depending on a bias voltage and a modulation signal to the optical waveguide; a driver circuit to generate a modulation signal in accordance with an input signal; a superimposer to superimpose a reference signal on the bias voltage, the reference signal having lower frequency than the modulation signal; and a controller to control a bias voltage in a direction orthogonal to a modulation direction of the modulator based on the frequency component of the reference signal extracted from a modulated optical signal generated by the modulator.

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Nishimoto, Hiroshi. (2015). Optical modulator and optical modulation control method (U.S. Patent No. 9069224). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/9069224

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