Influence of self- and cross-phase modulation on 40 Gbaud dual polarization DQPSK/D8PSK signals in 10 Gbit/s OOK WDM systems

Abstract

This paper, for the first time, investigates the nonlinear degradation of 40 Gbaud single-and dual polarization RZ-DQPSK/D8PSK signals caused by SPM and XPM-induced crosstalk from neighboring 10 Gbit/s NRZ-OOK channels in an WDM upgrade scenario. The investigations were numerically and experimentally conducted over a 320 km transmission link with three different wavelength configurations to address the impact of the walk-off length. The paper also presents the first numerical analysis of the XPM dependence on the relative state of polarization of the D8PSK with respect to the neighbors.

Influence of polarization state, baud rate and PMD on non-linear impairments in WDM systems with mixed PM (D)QPSK and OOK channels

“…3) leads to polarization crosstalk resulting in additional amplitude jitter. This effect is what we refer to as XPolM [11,12].This amplitude jitter is also depicted in constellation diagrams (shown in 4 th row in Fig. 3) which have a higher amplitude jitter in comparison to constellation diagrams in 2 nd row in Fig.…”

Performance Comparison of Differential 8-Ary Modulation Formats in High-Speed Optical Transmission Systems

“…Furthermore, B. Koch et al [2], [3] Gbit/s. Moreover, 3-bit/symbol formats, 8-ary DP-ASK (DQP-ASK) and 8-ary DPSK (D8PSK), were shown in [4]- [7], both achieving the same record bit-rate of 240 Gbit/s over a single wavelength with the corresponding symbol rate of 40 Gbaud. A higher-order format such as 16-level DP-ASK (4 bit/symbol) has also been reported but, due to its complexity, the symbol rate was limited to 10 Gbaud [8].…”