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)