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A joint timing offset (TO) and frequency offset (FO) estimation method based on Radon-Wigner transform (RWT) is first proposed for coherent optical orthogonal frequency-division multiplexing (CO-OFDM) systems. The result shows that the timing and frequency synchronization performance of the proposed method are both better than the Schmidl & Cox method and fractional Fourier transform (FrFT) algorithm...
All-optical wavelength conversion (AOWC) for 160Gbps polarization division multiplexing OFDM (PDM-OFDM) 16QAM signal in semiconductor optical amplifier (SOA) is theoretically simulated and realized in this paper. An external cavity laser is employed as the dual-pump seed. The measured result shows that the polarization insensitive converted signals can be achieved based on coherent detection without...
A timing synchronization algorithm with a new timing metric function is proposed for CO-OFDM system. Simulation results show that the MSE of the proposed algorithm is very close to zero in the system without chromatic dispersion, even though the OSNR is low. And it can provide higher accuracy comparing with other methods when the dispersion reaches 18ps/nm/km.
The system based on orthogonal pump four-wave mixing in an SOA is theoretically analyzed and simulated. The simulation results show that the polarization insensitive converted signal can be separated into two lightwaves without crosstalk.
In this paper, we propose a joint method of frequency offset estimation based on training symbol and virtual subcarriers for coherent optical orthogonal frequency division multiplexing(CO-OFDM) system. In the proposed method, the integer frequency offset is estimated through subtraction between the mode got form the first data subcarriers' position in OFDM symbols and the number of virtual subcarriers...
Self-Phase Modulation (SPM) can not be ignored in single light source OFDM system, so it is necessary to overcome the influence of SPM. A joint equalization solution to optical OFDM system based on orthogonal wavelet transform is proposed in this paper. In this method, block pilots are periodically inserted into the frame of OFDM signals. At receiver, the phase rotations of pilots are extracted to...
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