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. 02, 2010
Filed:
Feb. 01, 2007
Toshiaki Kobayashi, Tokyo, JP;
Kenji Uchida, Tokyo, JP;
Akira Toyama, Tokyo, JP;
Katsuya Ikezawa, Tokyo, JP;
Akira Miura, Tokyo, JP;
Yasukazu Akasaka, Tokyo, JP;
Toshiaki Kobayashi, Tokyo, JP;
Kenji Uchida, Tokyo, JP;
Akira Toyama, Tokyo, JP;
Katsuya Ikezawa, Tokyo, JP;
Akira Miura, Tokyo, JP;
Yasukazu Akasaka, Tokyo, JP;
Yokogawa Electric Corporation, Tokyo, JP;
Abstract
In a light modulating apparatus of an external modulating type which is used in an optical communication system, there are provided an LN modulator, a light branching circuit, a photoelectric converter, a bias control circuit, a driver for an LN modulator which serves to drive the LN modulator in response to an input electric signal, a capacitor for cutting off DC and low frequency components of the input electric signal, a low frequency component compensating circuit for compensating the DC and low frequency components of the input electric signal, and an adding circuit for adding an output of the bias control circuit and that of the low frequency component compensating circuit and generating a bias control signal of the LN modulator.