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

Benlachtar, Y; Watts, PM; Bouziane, R; Milder, P; Rangaraj, D; Cartolano, A; ... Killey, RI; + view all (2009) Generation of optical OFDM signals using 21.4 GS/s real time digital signal processing. OPT EXPRESS , 17 (20) 17658 - 17668. Gold open access

Abstract

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 167.2 MHz and can be deployed with either a direct-detection or a coherent receiver. The hardware design and the main digital signal processing functions are described, and we show that the main performance limitation is due to the low (4-bit) resolution of the digital-to-analog converter (DAC) and the 8-bit resolution of the IFFT core used. We analyze the back-to-back performance of the transmitter generating an 8.36 Gb/s optical single sideband (SSB) OFDM signal using digital up-conversion, suitable for direct-detection. Additionally, we use the device to transmit 8.36 Gb/s SSB OFDM signals over 200 km of uncompensated standard single mode fiber achieving an overall BER <10(-3). (C) 2009 Optical Society of America

Type:Article
Title:Generation of optical OFDM signals using 21.4 GS/s real time digital signal processing
Open access status:An open access publication
Publisher version:http://www.opticsexpress.org
Keywords:ELECTRONIC PREDISTORTION, DISPERSION COMPENSATION, TRANSMISSION, SYSTEMS, FIBER, SSMF, SPM, DSP
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering

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