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

El-Darawy M, Pfau T, Hoffmann S, Peveling R, Wördehoff C, Koch B, Porrmann M, Adamczyk O, Noe R (2008)
IEEE Photonics Technology Letters 20(21): 1796-1798.

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Abstract
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.
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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.
El-Darawy, M., Pfau, T., Hoffmann, S., Peveling, R., Wördehoff, C., Koch, B., Porrmann, M., et al. (2008). Fast Adaptive Polarization and PDL Tracking in a Real-Time FPGA-Based Coherent PolDM-QPSK Receiver. IEEE Photonics Technology Letters, 20(21), 1796-1798.
El-Darawy, M., Pfau, T., Hoffmann, S., Peveling, R., Wördehoff, C., Koch, B., Porrmann, M., Adamczyk, O., and Noe, R. (2008). Fast Adaptive Polarization and PDL Tracking in a Real-Time FPGA-Based Coherent PolDM-QPSK Receiver. IEEE Photonics Technology Letters 20, 1796-1798.
El-Darawy, M., et al., 2008. Fast Adaptive Polarization and PDL Tracking in a Real-Time FPGA-Based Coherent PolDM-QPSK Receiver. IEEE Photonics Technology Letters, 20(21), p 1796-1798.
M. El-Darawy, et al., “Fast Adaptive Polarization and PDL Tracking in a Real-Time FPGA-Based Coherent PolDM-QPSK Receiver”, IEEE Photonics Technology Letters, vol. 20, 2008, pp. 1796-1798.
El-Darawy, M., Pfau, T., Hoffmann, S., Peveling, R., Wördehoff, C., Koch, B., Porrmann, M., Adamczyk, O., Noe, R.: Fast Adaptive Polarization and PDL Tracking in a Real-Time FPGA-Based Coherent PolDM-QPSK Receiver. IEEE Photonics Technology Letters. 20, 1796-1798 (2008).
El-Darawy, Mohamed, Pfau, Timo, Hoffmann, Sebastian, Peveling, Ralf, Wördehoff, Christian, Koch, Benjamin, Porrmann, Mario, Adamczyk, Olaf, and Noe, Reinhold. “Fast Adaptive Polarization and PDL Tracking in a Real-Time FPGA-Based Coherent PolDM-QPSK Receiver”. IEEE Photonics Technology Letters 20.21 (2008): 1796-1798.
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