Phase noise mainly comes from laser linewidth,laser phase offset,in/quadrature (I/Q) phase mismatch,90° hybrid phase imbalance,fiber channel and component in optical quadrature phase shift keyed (QPSK) transmission system. Those phase noise can affect system performance of coherent optical communication system seriously. To compensate the impairments introduced by these phase noise,a novel feed forward phase estimation techniques with n-th power operation and logarithm operation are proposed. The simulation results shown the new solution can eliminate bit error rate (BER) deteriorating due to 7.5 MHz laser linewidth,30° laser phase offset,20° I/Q phase mismatch of transmitter,or 20° of 90° hybrid phase imbalance,and can improve the optical signal to noise ratio requirements 1 dB,significantly improve system performance.