Fast Adaptive Polarization and PDL Tracking in a Real-Time FPGA-Based Coherent PolDM-QPSK Receiver

El-Darawy M, Pfau T, Hoffmann S, et al. Fast Adaptive Polarization and PDL Tracking in a Real-Time FPGA-Based Coherent PolDM-QPSK Receiver. IEEE Photonics Technology Letters. 2008;20(21):1796-1798.Fast polarization changes of 40 krad/s and 6-dB polarization-dependent loss (PDL) are tracked in a 2.8-Gb/s real-time coherent quadrature phase-shift keying receiver. The tolerance against fast polarization changes and PDL is measured for different polarization control time constants. The sensitivity penalty of the receiver at a polarization change speed of 40 krad/s is 0.7 dB at bit-error rate (BER) of 1times 10-3, with a BER floor of 6.1times10-7. With an additional PDL of 6 dB, these figures become 1.7 dB and 9.6 times 10-6, respectively