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:
May. 10, 2011
Filed:
Aug. 04, 2009
Kazumasa Takabayashi, Kawasaki, JP;
Tsutomu Ishikawa, Yamanashi, JP;
Hirokazu Tanaka, Yamanashi, JP;
Kazumasa Takabayashi, Kawasaki, JP;
Tsutomu Ishikawa, Yamanashi, JP;
Hirokazu Tanaka, Yamanashi, JP;
Fujitsu Limited, Kawasaki, JP;
Eudyna Devices Inc., Yamanashi, JP;
Abstract
A tunable laser module includes a tunable laser section including a gain medium and a wavelength filter having a periodic characteristic which brings about a discontinuous variation of an oscillation wavelength, and a monitoring section adapted to output a monitoring signal which periodically varies in response to the oscillation wavelength of the tunable laser section. The monitoring section includes a monitoring wavelength filter having a periodic characteristic which defines the monitoring signal. The relationship between the period of the wavelength filter and the period of the monitoring wavelength filter is set such that the monitoring signal varies when the oscillation wavelength varies discontinuously.