This work was supported bythe Great Scientific Research Projectof Zhejiang Province ,P.R.China (No.021101558);the Min-istry of Science and Technology ,Korea as a part of project fundsof the Korea-China Optical Technology Research Center .
S-band gain flattened distributed fiber Raman amplifier with a bandwidth from 1 488 nm to 1 541 nm (53 nm in width) ,an averaged gain of 10 dB and a gain ripple of ±0.6 dB is obtained successfully, in which a singl...