8 400-Gbit/s PDM-QPSK with 100 GHz channel spacing over 2000km transmission using MAP detection


We simulated 8 400-Gbit/s PDM-QPSK over 2000-km transmission by using Map detection to reduce the channel spacing to 100-GHz. MAP detection can significantly improve the system performance to < 10−3 BER compared to non-MAP detection. 


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