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We experimentally investigate the characteristics of 126-Gb/s coded 6PolSK-QPSK signals in the nonlinear transmission regime and demonstrate that required OSNR improvement is increasing with fiber-launch power due to coded modulation as well as digital back propagation.
Error-free wavelength conversion of a 40 Gb/s DPSK signal is presented in a wavelength range of 45 nm using a dual pump four-wave mixing scheme in a 1.3 μm quantum-dot semiconductor optical amplifier.
Error-free booster amplification in a 4-mm QD-SOA has been achieved with 1-dB OSNR-penalty up to +15dBm output power for single-channel 80-Gb/s RZ-OOK signals and up to +8.3dBm for 4-channel multi-wavelength (80-Gb/s RZ-OOK + 3 × 40-Gb/s NRZ-OOK) signals on a 5-nm grid.
A polarization-independent optical limiter is proposed using two-stage polarization-diversity configured optical parametric amplifiers in gain-saturated condition. Its amplitude level equalizing effect is successfully demonstrated for a 40 Gb/s signal with less than 0.2 dB polarization dependence.
We present an InGaAs/GaAs quantum dot semiconductor amplifier with a 90%-10% nonlinear gain recovery time of only 16 ps which enables pattern-effect free amplification of 80 Gb/s RZ-OOK data signals with only 0.3 dB BER penalty.
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