Figure 8

Numerical simulation of RZ bit sequence encoding in XP mode ((a1) and (b1)), YP mode ((a2) and (b2)), and both in XP and YP modes ((a3) and (b3)), when the RZ bit sequence has an SNR = 30 dB ((a1)–(a3)), SNR = 20 dB ((b1)–(b3)). Insets: eye diagrams corresponding to (a1)–(b3), respectively.