Comparison of implicit training and implicit pilot in coherent optical transmission

Performance of implicit training and implicit pilot is compared in detail in 112-Gb/s 16QAM coherent optical system by simulation. Q factor performance after 18 spans of SSMF transmission results in proper size of implicit training and pilot. Simulation results demonstrate that implicit pilot based channel estimation outperforms implicit training based channel estimation about 6% because it has a better range for averaging in the process of abstracting the known information.