US 7,535,629 B2
	Method and apparatus for controlling multiple-wavelength-pumped Raman amplifier and computer product
Koji Fujimura, Tokyo (Japan); Misao Sakano, Tokyo (Japan); Takeshi Nakajima, Tokyo (Japan); and Shu Namiki, Tokyo (Japan)
Assigned to The Furukawa Electric Co., Ltd., Tokyo (Japan)
Filed on Jul. 03, 2007, as Appl. No. 11/772,956.
Application 11/772956 is a division of application No. 11/212903, filed on Aug. 29, 2005, granted, now 7,262,903.
Application 11/212903 is a continuation of application No. PCT/JP2004/002341, filed on Feb. 27, 2004.
Claims priority of provisional application 60/449830, filed on Feb. 27, 2003.
Claims priority of provisional application 60/464854, filed on Apr. 24, 2003.
Prior Publication US 2008/0040057 A1, Feb. 14, 2008
Int. Cl. H01S 3/00 (2006.01)

U.S. Cl. 359—334  [359/337.11]

50 Claims

1. An apparatus 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 comprising 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, wherein the determining unit estimates the power of each of the signal channels by performing an interpolation of the values monitored by the photodetectors.