In order to explore new fiber materials that can be used for discrete Raman amplification,first-and second-order Raman amplifiers are designed based on TiO2-doped fiber.A pump parameter configu-ration scheme with high power conversion efficiency and flat gain is given.The gain characteristics of first-order and second-order Raman amplifiers based on TiO2-doped fiber and second-order Raman am-plifiers based on GeO2-doped fiber are compared with the same total pump power.The simulation result shows that in the 60 nm bandwidth range of L-band,32 dBm pump light is injected forward into 6 km long TiO2-doped fiber to amplify 3 dBm signal light.Its power conversion efficiency can reach 41.57％,and the gain flatness is only 1.14 dB.Compared with the second-order Raman amplifier doped with GeO2 fiber,it has a more stable output gain.
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