Using dispersion compensation chirped fiber Bragg grating(CBG),2 500 km-10 Gbps return to zero(RZ) and carrier suppressed RZ(CSRZ) transmission system on G.652 fiber is successfully demonstrated without electric regenerator.At 2 080 km and 2 560 km,power penalty for RZ is about 3 dBm and 5 dBm (condition:RZ signal,BER=10~ -12 ,PRBS=10~ 23-1 );And power penalty for CSRZ is about 1 dBm and 3 dBm.The result indicates it is superior to the system using CSRZ signal under same condition.