|Title:||100-km Long-reach Carrierless MMWoF Link with Destructively Interfered Beating or Single-sideband Filtered OFDM||Authors:||Weng Z
|Keywords:||Long-reach passive optical;Millimeter-wave over fiber (MMWoF);Quasi-color-free laser diode (QCFLD);Bandwidth;Energy efficiency;Microwave filters;Millimeter waves;Modulation;Optical heterodyning;Signal to noise ratio;Available bandwidth;Filtering process;Filtering schemes;Gain competition;Modulation bandwidth;Signal to noise;Single side bands;Spectral sidebands;Orthogonal frequency division multiplexing||Issue Date:||2021||Source:||Journal of Lightwave Technology||Abstract:||
Based on the use of a dual-wavelength controlled quasi-color-free laser diode (QCFLD) transmitter with either destructively interfered beating or single-sideband filtering after receiving at a remote node, the 100-km long-reach (LR) carrierless millimeter-wave over fiber (MMWoF) link with directly-encoded orthogonal frequency-division multiplexing (OFDM) at 10-15 Gbit/s in optical wired and MMW wireless domains is experimentally demonstrated. The optically heterodyned MMW OFDM data by the destructively interfered beating obtains more gain from the RF amplifier than that without carrierless operation, as the MMW carrier with reduced power no longer dominates the gain competition. The destructively-interfered-beating 16-QAM OFDM data can transmit over 100-km SMF and 10-m free-space. The modulation bandwidth can be enhanced from 2 GHz to 2.5 GHz with a raw data rate of 10 Gbit/s after the OFDM subcarrier sidelobe filtering process. The sidelobe filtering suppresses the impact of the QCFLD chirp on the signal-to-noise of the optically heterodyned beating MMW carrierless OFDM data when reducing the sidelobes of each OFDM subcarrier. Besides, the single-sideband-filtered OFDM data can also obtain a higher gain than the double-sideband one due to the relief of RF amplifier saturation. Even though the noise located at the conjugated data band involves in the frequency-down-converted data after MMW down-mixing, the single-sideband-filtered OFDM data still allows the transmission of 8-QAM single-sideband OFDM data with 2 GHz over 100-km in SMF and 10-m in free-space at a raw data rate of 6 Gbit/s in one single-sideband and 12 Gbit/s at both sidebands. In comparison, the destructively-interfered-beating scheme offers large bandwidth and high spectral usage efficiency of 4 bit/s/Hz, whereas the single-sideband-filtering scheme effectively broadens the available bandwidth by saving another spectral sideband for allocating other carriers and data, which facilitate advantages including doubled band usage and half modulation power consumption. Both schemes offer comparable performance for future long-reach carrierless MMWoF applications. IEEE
|Appears in Collections:||電機工程學系|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.