PMD-Tolerant 20 krad/s Endless Polarization and Phase Control for BB84-Based QKD with TDM Pilot Signals

Abstract:
TDM-based polarization and differential phase control with 35ps PMD tolerance and 20krad/s tracking speed is demonstrated. 600ns intervals are reserved for QKD and for 0deg- and 45deg-polarized pilot signals. ECLs are modulated directly, with high extinction. Power budget is 17dB, fiber length is 63 km.