Problems of bit error rate rising due to Optical Signal-to-Noise Ratio（OSNR） worsening in beyond-100 Gbit/s optical network can be overcomed by utilizing feed Forward Error Correction（FEC） codes which are comprehensively applied in optical networks. Traditional encoders with high latency cannot meet the requirements of high-speed optical network

and studies on high-speed encoder are seldom. Studies on decoders usually focus on key equation solving algorithms rather than low latency decoding schemes. A parallel encoding and decoding scheme is proposed in this paper for KP4 FEC

i.e. RS（544

514） code

with the encoder’s throughput reaching above 17 Gbit/s

and latency lower than 0.3 μs

while the decoder’s throughput reaching above 66 Gbit/s

and latency lower than 0.17 μs.