pulses. As we use no guard bands, the carriers have a spacing of 12.5 GHz equal to the symbol rate or Nyquist bandwidth of the data. We achieve a net spectral efficiency of 6.4 bit/s/Hz using a software-defined transmitter, which generates the electric drive-signals for the electro-optic modulator in real-time.
—In this paper we present an FPGA based, ultra-high speed OFDMA system which is intended to be used as a bandwidth efficient, advanced modulation format in optical access networks like fiber-to-the-home. The aggregate bandwidth of the network reaches up to 50 GBit/s while handling hundreds of different subscribers, sharing the same optical bandwidth.… (More)