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Yannis Benlachtar, Philip M. Watts, Rachid Bouziane, Peter A. Milder, Robert Koutsoyannis, James C. Hoe, Markus Püschel, Madeleine Glick and Robert I. Killey (IEEE Journal of Selected Topics in Quantum Electronics, Vol. 16, No. 5, pp. 1235-1244 , 2010)
Real-Time Digital Signal Processing for the Generation of Optical Orthogonal Frequency Division Multiplexed Signals
Preprint (836 KB)
Published paper (link to publisher)
We investigate the design of a field programmable gate array (FPGA) based optical orthogonal frequency division multiplexing (OFDM) transmitter implementing real time digital signal processing at 21.4 GS/s. The transmitter was utilized to generate 8.34 Gbit/s QPSK-OFDM signals for direct detection. We study the impact of the finite resolutions of the inverse fast Fourier transform (IFFT) cores and the digital-to-analog converters (DAC) on the system performance. Furthermore, we demonstrate a transmission experiment over 800 and 1600 km of uncompensated standard fiber with negligible OSNR penalties and BER < 10^-3.Keywords: IP cores for FPGA/ASIC, Discrete/fast Fourier transform, OFDM