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We demonstrated a dense sub-carrier uniform division labeling transmission system by using MATLAB software. The simulation results indicated that dense sub-carrier uniform division labeling has a good advantage over that ordinary OFDM system, and the signals at a bit rate 50Gbit/s have a good performance which is more than 10 when OSNR is equal to 25dB over 1000km optical fiber channel which only...
In this paper, we have proposed an optical pulse position modulation based on double-circle iteration, targeting at the next generation of high speed optical metropolitan area networks. The focuse of this paper lies on the performance of spectral efficiency, the bit error rate and chromatic dispersion. The proposed modulation format is also compared to on-off-keying(OOK) and 4-level pulse-amplitude...
A new feedback symbol timing recovery technique using timing estimation joint equalization is presented for digital receivers with two samples/symbol or higher sampling rate. The clock recovery algorithm in this paper is different from the traditional method, using different algorithm by distinguishing the phase of adjacent symbols. A new timing algorithm is proposed for the adjacent signals with...
A degree distribution mapping method of parity check matrix in irregular QC-LDPC based FSO communication is proposed. Before channel coding, use the mapping method to select the appropriate distribution of the parity check matrix corresponding to atmospheric channel estimation feedback. BER performance of the optimal distribution of the parity check matrix in different turbulence intensity has been...
A LDPC coded DAPPM (4×4 & 4×8) modulated scheme for both strong and weak turbulent free-space optical communication is proposed and its BER performance is analyzed by Monte Carlo simulation. Results prove its well reliability especially for weak turbulent channel, and calls for advanced forward error control means to deal with strong turbulent channel.
We propose and experimentally demonstrate a novel MAMSK-OFDM-PON. 5-Gb/s MAMSK-OFDM signal and 2.5-Gb/s upstream OOK signal is transmitted over 20km fiber successfully. The results show the prospect of this technology in future optical access networks.
We experimentally demonstrate a dynamic λ-OFDMA with selective DPSK overlaid, and multicast control is realized through an alternative LO. The 10-Gb/s P2P signal, 2.5-Gb/s overlaid and 1.25-Gb/s upstream signal are transmitted 25km fiber successfully.
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