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:
Feb. 20, 2007
Filed:
Aug. 30, 2005
Masaji Noguchi, Yokohama, JP;
Tomohiro Ueno, Yokohama, JP;
Hiroyasu Ito, Yokohama, JP;
Hideyuki Miyata, Kawasaki, JP;
Yutaka Kai, Kawasaki, JP;
Masaji Noguchi, Yokohama, JP;
Tomohiro Ueno, Yokohama, JP;
Hiroyasu Ito, Yokohama, JP;
Hideyuki Miyata, Kawasaki, JP;
Yutaka Kai, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A radio-frequency-signal generator generates an RF signal. An optical monitor monitors a first intensity of a reference signal and a second intensity of a drop signal. A reference-frequency determining unit determines, based on the first intensity, a first frequency of an RF signal that causes the AOTF to output the reference signal. A temperature detecting unit detects a temperature of the AOTF. A frequency calculating unit calculates a second frequency of an RF signal that causes the AOTF to output a drop signal of a desired wavelength. A control unit controls the RF-signal generator to generate the RF signal of the second frequency calculated.