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Kerr nonlinearity compensation by optical phase conjugation is demonstrated in a WDM PDM 16-QAM system. Improved received signal quality is reported for both dispersion-compensated and dispersion-uncompensated transmission and a comparison with digital backpropagation is provided.
The deployment of phase-insensitive fiber-optic parametric amplifiers (PI-FOPAs) as inline amplifiers in long-haul WDM transmission systems is discussed, and it is outlined how to design PI-FOPAs to be a valuable upgrade option for this application.
We experimentally demonstrate the demultiplexing of 8×13.4 Gbaud OFDM-QPSK subcarriers using a silicon nanophotonic-based discrete Fourier transform (DFT) filter. All eight subcarriers showed less than 1.5 dB OSNR penalty compared to the theoretical limit.
We experimentally and numerically show that the Brillouin back scattering can result in signal distortions in diversity loop-based polarization insensitive single-pump fiber-optical parametric amplifiers, limiting the distortion-free gain to 10–15 dB for typical highly nonlinear fibers.
The performance of a polarization-independent fiber-based optical parametric amplifier is experimentally investigated in terms of amplification and wavelength conversion for optical phase conjugation applications using 5×28-GBd PDM 16-QAM signals. Good conjugated signal quality up to 13-dB gain is obtained.
Effective Kerr nonlinearity mitigation is experimentally demonstrated using optical phase conjugation in the middle of an 800-km dispersion-compensated link for a 5-channel WDM 28-GBd PDM 16-QAM signal. A Q-factor improvement of 0.9 dB over no mitigation allows a BER<3.8×10−3.
The performance of a FOPA as inline-amplifier for 28-GBd 16-QAM signals at 20-dB gain in a 50-GHz 5-channel DWDM system is experimentally investigated. Less than 0.7-dB OSNR penalty at a BER of 1×10−3 was measured with 0-dBm per-channel output power.
A polarization insensitive FOPA based on a PM-HNLF loop diversity scheme is demonstrated. Achieved ON-OFF gain was 19.2 dB whilst the polarization dependence was 0.7 dB across a signal wavelength range of 1544-1560 nm.
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