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. 14, 2007
Filed:
Jul. 29, 2003
Shihori Imai, Legal Representative, Kawasaki, JP;
Toru Yamazaki, Kawasaki, JP;
Kakuji Inoue, Sapporo, JP;
Setsuo Misaizu, Sapporo, JP;
Yasunori Nagakubo, Kawasaki, JP;
Shihori Imai, legal representative, Kawasaki, JP;
Toru Yamazaki, Kawasaki, JP;
Kakuji Inoue, Sapporo, JP;
Setsuo Misaizu, Sapporo, JP;
Yasunori Nagakubo, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An optical transmitter comprises an amplitude modulation unit performing amplitude modulation of only a one-side amplitude of a main signal with a low-frequency signal having a predetermined frequency. An optical modulator receives an input signal generated after the one-side amplitude modulation, and modulates an incoming light in response to the received signal in accordance with a predetermined modulation-characteristic curve to output an optical output signal. An operating point control unit applies a predetermined bias voltage to the optical modulator to control a level of the input signal substantially applied to the modulation-characteristic curve so that the one-side amplitude of the main signal is applied to a minimum portion of the modulation-characteristic curve of the optical modulator.