Fig. 1. Flowchart of joint optimization strategy. (a) Launch power optimization process; (b) group-wise entropy loading process

Fig. 2. Power pre-weighting

Fig. 3. Look-up table of PS-256-QAM

Fig. 4. Simplified multi-band simulation platform based on mean-field theory. (a) Block diagram of system-level simulation; (b) DSP flow at transmitter; (c) DSP flow at receiver

Fig. 5. Performance comparison of power optimization under three schemes. (a) SNR of three schemes; (b) optimized launch power profiles of objective-function-based power control strategy and non-uniform launch strategy. (c) channel-wise ASE-to-NLI noise ratio of objective-function-based power control strategy and non-uniform launch strategy; (d) system capacity gain achieved by three schemes

Fig. 6. Comparison of full-band performance between fast closed-form model and simulation platform

Fig. 7. Performance of the worst-performing channels in three bands. (a) GMI; (b) SNR