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:
Jul. 17, 2007
Filed:
Sep. 27, 2006
Akira Miura, Musashino, JP;
Kenji Uchida, Musashino, JP;
Katsuya Ikezawa, Musashino, JP;
Hiroyuki Matsuura, Musashino, JP;
Akira Toyama, Musashino, JP;
Toshiaki Kobayashi, Musashino, JP;
Tsuyoshi Yakihara, Musashino, JP;
Kousuke Doi, Musashino, JP;
Akira Miura, Musashino, JP;
Kenji Uchida, Musashino, JP;
Katsuya Ikezawa, Musashino, JP;
Hiroyuki Matsuura, Musashino, JP;
Akira Toyama, Musashino, JP;
Toshiaki Kobayashi, Musashino, JP;
Tsuyoshi Yakihara, Musashino, JP;
Kousuke Doi, Musashino, JP;
Yokogawa Electric Corporation, Tokyo, JP;
Abstract
A light modulation apparatus including a Mach-Zehnder type light modulator, a driver for modulator outputting a control signal according to an input electric signal, a light branching circuit branching the output light signal, and a bias control circuit applying a bias voltage to the light modulator based on the branched light signal, the apparatus further comprises: a burst pause state detection circuit detecting a pause state of a burst signal included in the input electric signal; a photoelectric transducer converting an output light signal branched by the light branching circuit into an electric signal; a sampling circuit extracting the electric signal converted while the pause state is detected by the burst pause state; and a bias voltage adjustment circuit adjusting a bias voltage value of the bias voltage based on a voltage level of the extracted electric signal.