Fig. 1. Two MS-CCPR schemes. (a) Feedback MS-CCPR scheme; (b) feedforward MS-CCPR scheme

Fig. 2. Structure diagrams of MS-CCPR and slave phase tracker. (a) Structure diagram of MS-CCPR; (b) structure diagram of slave phase tracker

Fig. 3. Typical WDM transmission system based on optical frequency comb

Fig. 4. Simulated spectrum of five-line frequency comb with equal amplitude

Fig. 5. Phase noise curves and phase difference curve of master-slave channel under 320 km transmission condition. (a) Phase noise curves of master-slave channel; (b) phase difference curve of two channels

Fig. 6. Master-slave channel phase curves and slave phase tracking curves under the condition of residual frequency offset. (a) Master-slave channel phase curves; (b) slave phase tracking curves

Fig. 7. Computational complexity curve

Fig. 8. Performance comparison between independent carrier recovery and master-slave carrier recovery during transmission from 0 to 400 km