Fig. 1. The structure of equalizer based on CNN-BiLSTM

Fig. 2. Parameter update diagram of multi-source domain transfer learning

Fig. 3. Schematic of transferring the learning for the optical communication system with the equalizer based on CNN-BiLSTM

Fig. 4. 5-channel WDM transmission experimental setup

Fig. 5. Q-factor curve migrating from different transmit power to 2 dBm

Fig. 6. Q-factor curve for migration from heterogeneous domain set to 2 dBm

Fig. 7. The relationship between the transmitted power of the target domain and the Q -value