Title :
Fast Adaptive Polarization and PDL Tracking in a Real-Time FPGA-Based Coherent PolDM-QPSK Receiver
Author :
El-Darawy, Mohamed ; Pfau, Timo ; Hoffmann, Sebastian ; Peveling, Ralf ; Wördehoff, Christian ; Koch, Benjamin ; Porrmann, Mario ; Adamczyk, Olaf ; Noè, Reinhold
Author_Institution :
Dept. of Opt. Commun. & High-Freq. Eng., Univ. of Paderborn, Paderborn
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.
Keywords :
error statistics; field programmable gate arrays; multiplexing; optical fibre communication; optical fibre losses; optical fibre polarisation; optical receivers; quadrature phase shift keying; PDL tracking; bit rate 2.8 Gbit/s; bit-error rate; coherent PolDM-QPSK receiver; fast adaptive polarization; polarization control time constant; polarization-dependent loss; polarization-division multiplexing; quadrature phase-shift keying receiver; real-time FPGA; receiver sensitivity penalty; Heterodyning; optical polarization; quadrature phase-shift keying (QPSK); synchronous detection;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2008.2004685
