Patent ID: 6504973
Filing Date: 2003-01-07
Classification: G02B,H04B

Abstract:
A Raman amplified dispersion compensation module (RADCM) of the kind having two or more dispersion compensation fibers (DCFs) which cooperate to compensate for chromatic dispersion produced in light signals conducted through a transmission fiber, comprising:a first DCF having a first length, an input end and an output end, and the first DCF has a first Raman gain coefficient (gr(&lgr;)), a first Raman effective fiber area (Areff ), and a first dispersion characteristic; a second DCF having a second length, an input end and an output end, wherein the input end of the second DCF is arranged to receive light signals from the output end of the first DCF in the absence of a pump signal source between the input end of the second DCF and the output end of the first DCF, and the second DCF has a second Raman gain coefficient, a second Raman effective fiber area, and a second dispersion characteristic selected to cooperate with the first dispersion characteristic so that compensated light signals will be provided at the output end of the second DCF; and a pump light source coupled to either the output end of the second DCF or to the input end of the first DCF, wherein the pump light source has a certain power level at one or more wavelengths for producing a desired module gain with a determined bandwidth for amplifying light signals to be compensated; and the lengths of the first and the second DCFs are selected so that the desired module gain is optimized.