Fig. 2. Comparison of step-to-step size variation among constant (CSS), logarithmic (LSS), and binary logarithmic (BLSS) step size selection algorithms
The algorithm has been investigated in a 2400 km single-mode fiber (SMF) DP-16QAM transmission system without inline dispersion compensation. Again, it has been demonstrated for different system capacity and bandwidth-efficiency configurations with 100 Gbit/s – 12 GBaud, 112 Gbit/s – 14 GBaud, 168 Gbit/s – 21 GBaud, and 224 Gbit/s – 28 GBaud. Performance comparison of the algorithm is made with different compensation techniques in terms of quality factor (Q) and bit-error rate (BER), calculated from the error vector magnitude (EVM) of received symbols.
Table 1: DBP step sizes for an 80 km fiber span (10 steps)