Comparison of the compensation effects of fiber nonlinear impairments with mid-span optical phase conjugation between PDM CO-OFDM system and PDM QPSK system
Xu Fei, Guo Meng-Qi, Wang Lei, Qiao Yao-Jun†, , Tian Hui-Ping
       

Relationship between Q factor and transmission distance with launch power = 0 dBm and OSNR = 15 dB.