Comparison of XPM and XpolM-Induced Impairments in Mixed 10G - 100G Transmission

摘要

The deployment of 100G channels over legacy 10 and 40G infrastructure started in late 2009 and has been continuously accelerating so far. Since accumulated chromatic dispersion and linear polarization effects (PMD and polarization cross-talk between orthogonal channels) are compensated using digital signal processing (DSP), the performance of the 100G channels is mainly limited by optical noise, tight optical filtering (due to cascaded ROADMs) and fiber nonlinearities including intra-channel (SPM, iXPM, iFWM) and inter-channel (XPM, XpolM) effects. The latter effects may require to switch-off neighboring legacy channels to operate the 100G channel and are therefore of great interest. In the following, we intend to understand whether XpolM-induced depolarization or XPM-induced timing jitter represents the main impairment for the transmission of a 112 Gb/s DP-QPSK signal over 800 km of legacy 10G system. FWM effects can be ignored in this scenario as the phase-matching condition requires very low channel spacing in standard single mode fibers (G652).