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Low-density parity-check (LDPC) codes combined with polarization scramblers are used to mitigate polarization mode dispersion (PMD) in 40 Gbit/s optical fiber system.The simulations are performed to compare the correction performance of LDPC codes and Reed-Solomon (RS) code used in this PMD mitigation scheme.Results show that LDPC codes can achieve a better performance than the RS code with the same redundancy.The scrambling speed of polarization scramblers for LDPC codes system is also discussed,the optimal speed IOMHz is obtained.