Generation of optical OFDM signals using 21.4 GS/s real time digital signal processing.

We demonstrate a field programmable gate array (FPGA) based optical orthogonal frequency division multiplexing (OFDM) transmitter implementing real time digital signal processing at a sample rate of 21.4 GS/s. The QPSK-OFDM signal is generated using an 8 bit, 128 point inverse fast Fourier transform (IFFT) core, performing one transform per clock cycle at a clock speed of 167.

10.7 Gb/s transmission over 1200 km of standard single-mode fiber by electronic predistortion using FPGA-based real-time digital signal processing.

A 10.7 Gb/s electronic predistortion transmitter using FPGA-based real time 2 Samples/bit digital signal processing based on 55-tap finite impulse response filters is described. Transmission over 1200 km of standard single-mode fiber without optical dispersion compensation is demonstrated with an OSNR penalty of only 2.