Time Domain Equalization and Digital Back-Propagation Method-Based Receiver for Fiber Optic Communication Systems

Figure 12

Constellation diagram of (a) DP-QPSK with qualified DSP, (b) DP-QPSK with 5 km and −45 ps/nm/km, (c) DP-QPSK with 5 km and −40 ps/nm/km, and (d) DP-QPSK with a conventional DSP receiver.

(a)

(b)

(c)

(d)