Abstract
Nonlinear phase noise (NLPN) induced by the interaction between the amplified spontaneous emission noise (ASE) and the information signal in polarization-multiplexed quadrature phase-shift keying (PM-QPSK) systems at 42.8(112) Gbit/s over dispersion-managed (DM) link is investigated by numerical simulations. Both symbol-aligned non-return-to-zero (NRZ) PM-QPSK and symbol-interleaved return-to-zero (RZ) PM-QPSK formats are considered and compared. We find that for aligned NRZ-PM-QPSK systems, the impact of NLPN on system performance seems rather weak due to the strong interchannel cross-polarization modulation (XPolM). However, when the interleaved RZ-PM-QPSK format is used, in which the XPolM is suppressed significantly, the system performance is seriously degraded by NLPN, especially at low bit rates. Results of 1000-km transmission employing standard single-mode fiber (SSMF) over DM link show that for 42.8 Gbit/s coherent RZ-PM-QPSK systems, the nonlinear threshold (NLT) will decrease from 6 to 2 dBm due to nonlinear phase noise when symbol-interleaved format is used.
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