A frequency-domain channel estimation with weighed intra-symbol averaging (WISA) technique has been presented in this paper. The tolerance towards nonlinearity has been investigated in a 224Gbit/s 16QAM coherent optical system by simulation. System performance is evaluated with the Q factor when increasing the transmission distance from 800km to 1440km. Simulation results demonstrate that the WISA based channel estimation surpasses intra-symbol averaging based channel estimation by 13.3% in terms of maximum transmission distance when Q factor threshold is 8.5dB.

© 2014 Optical Society of America

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