Benlachtar Yannis, Watts Philip M, Bouziane Rachid, Milder Peter, Rangaraj Deepak, Cartolano Anthony, Koutsoyannis Robert, Hoe James C, Püschel Markus, Glick Madeleine, Killey Robert I
Optical Networks Group, Department of Electronic and Electrical Engineering, University College London, Torrington Place. London. UK. WC1E 7JE.
Opt Express. 2009 Sep 28;17(20):17658-68. doi: 10.1364/OE.17.017658.
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).
我们展示了一种基于现场可编程门阵列（FPGA）的光正交频分复用（OFDM）发射机，它以21.4 GS/s的采样率实现实时数字信号处理。QPSK-OFDM信号使用一个8位、128点快速傅里叶逆变换（IFFT）核生成，在167.2 MHz的时钟速度下每个时钟周期执行一次变换，并且可以与直接检测或相干接收机一起部署。描述了硬件设计和主要数字信号处理功能，并且我们表明主要性能限制是由于数模转换器（DAC）的低（4位）分辨率以及所使用的IFFT核的8位分辨率。我们分析了使用数字上变频生成8.36 Gb/s光单边带（SSB）OFDM信号的发射机的背对背性能，该信号适用于直接检测。此外，我们使用该器件在200 km未补偿的标准单模光纤上传输8.36 Gb/s SSB OFDM信号，实现了总体误码率<10^(-3)。
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