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. 15, 2006
Filed:
Jun. 28, 2001
Satoshi Kajiya, Tokyo, JP;
Kazuyuki Ishida, Tokyo, JP;
Katsuhiro Shimizu, Tokyo, JP;
Yukio Kobayashi, Tokyo, JP;
Satoshi Kajiya, Tokyo, JP;
Kazuyuki Ishida, Tokyo, JP;
Katsuhiro Shimizu, Tokyo, JP;
Yukio Kobayashi, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, unknown;
Abstract
The optical transmission apparatus has a Mach-Zehnder optical modulator, a light source for applying an optical signal of a continuous light to the optical modulator, a driving circuit for inputting a driving signal into the optical modulator, a branching filter for taking out a part of an output optical signal, a photodiode for converting the taken-out output optical signal into an electric signal, a band pass filter for extracting a frequency component of a driving signal included in this electric signal, an error signal generator circuit for generating an error signal of a bias voltage that minimizes a value of the extracted frequency component, and a bias voltage control circuit for applying a bias voltage added with this error signal to the optical modulator.