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Midlink optical phase conjugation (OPC) based on four wave mixing (FWM) in semiconductor optical amplifier (SOA) can be used to compensate for Gordon-Mollenauer phase noise in CO-OFDM long-haul systems. Simulation of 40Gb/s CO-OFDM systems without optical dispersion compensation is presented and Q factor can be increased by >;6dB.
We present the pilot-aided phase compensator (PC) at receiver to compensate phase drift due to laser linewidth for 100 Gb/s polarization division multiplexing coherent optical OFDM (PDM-CO-OFDM) system. Simulating results are shown that PC is very effective and the improvement of Q is >;5 dB for 800 km link with 100 kHz-linewidth.
The fiber nonlinearity impairments in 40Gb/s CO-OFDM are post-compensated by fiber nonlinearity post-compensation (FNPC) located before the receiver, which includes spectrum inversion (SI) and a subsequent 80km compensation high nonlinear fiber (HNLF). Simulating show that the performance can be significantly improved for single-channel and WDM systems.
In Orthogonal Frequency Division Multiplexing (OFDM), Fourier Transform (FT) is used as a modulation technique. To avoid Inter-symbol Interference (ISI) in OFDM by a time dispersive channel, a Cycle Prefix (CP) is used which also reduces its spectral efficiency. Discrete Wavelet Packet Transform (DWPT) as a modulation scheme has been proposed for wireless communication. In this paper, DWPT based OFDM...
In this paper influence of inline dispersion compensation in 100Gb/s polarization division multiplexing coherent optical OFDM (PDM-CO-OFDM) system is studied by numerical simulation. The results show that amplified spontaneous emission noise (ASE) in additional Erbium-doped fiber amplifier (EDFA) and dispersion compensation fiber (DCF) nonlinearity has great impacts on the performance of inline dispersion...
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