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. 15, 2005
Filed:
Feb. 19, 2002
Koichi Kimotsuki, Fukuoka, JP;
Kazunori Hayami, Fukuoka, JP;
Tatsuo Nagayoshi, Fukuoka, JP;
Takanori Maki, Kawasaki, JP;
Koichi Kimotsuki, Fukuoka, JP;
Kazunori Hayami, Fukuoka, JP;
Tatsuo Nagayoshi, Fukuoka, JP;
Takanori Maki, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
The present invention is directed to the provision of a wavelength division multiplexing optical transmission apparatus and, more particularly, to a wavelength division multiplexing optical transmission apparatus having high wavelength stability unaffected by the temperature characteristics, aging, etc. of an arrayed-waveguide grating (AWG) and its peripheral components. The wavelength division multiplexing optical transmission apparatus comprises: an arrayed-waveguide gratinghaving operating input/output ports and an input dummy port; a light emitting meansfor generating a pilot signal to be input to the input dummy port; a light detecting meansfor monitoring the pilot signal contained in a wavelength division multiplexed signal output from the operating output port; and a temperature control circuitfor controlling the temperature of the arrayed-waveguide grating in such a manner as to cancel the amount of wavelength fluctuation occurring in the arrayed-waveguide grating and detected by monitoring the pilot signal.