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. 19, 2009
Filed:
Jul. 03, 2007
Method and apparatus for controlling multiple-wavelength-pumped raman amplifier and computer product
Koji Fujimura, Tokyo, JP;
Misao Sakano, Tokyo, JP;
Takeshi Nakajima, Tokyo, JP;
Shu Namiki, Tokyo, JP;
Koji Fujimura, Tokyo, JP;
Misao Sakano, Tokyo, JP;
Takeshi Nakajima, Tokyo, JP;
Shu Namiki, Tokyo, JP;
The Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
An apparatus, method and computer program product for controlling pumping light powers for a multiple-wavelength-pumped Raman amplifier that is pumped by pumping lights from a plurality of pumping light sources, by measuring gain wavelength characteristic or signal-power wavelength characteristic of the multiple-wavelength-pumped Raman amplifier using a plurality of photodetectors having different wavelength-sensitivity characteristics. The apparatus includes a determining unit that estimates a power of each of signal channels in a wavelength band for use based on values monitored by the photodetectors, and determines the pumping light powers using the power of each of the signal channels estimated. The determining unit estimates the power of each of the signal channels by performing an interpolation of the values monitored by the photodetectors.