Learn More
We have generated single-wavelength channel 8-PSK and 16-QAM RZ-data signals up to 5.1 Tb/s and subsequently extracted the time-division base rate channel using an ultrafast coherent receiver with time-division demultiplexing function and digital BER post-processing.
We present experimental and numerical investigations of Kerr nonlinearity compensation in a 400-km standard single-mode fiber link with distributed Raman amplification with backward pumping. A dual-pump polarization-independent fiber-based optical parametric amplifier is used for mid-link spectral inversion of 5 × 28-GBd polarization-multiplexed 16-QAM(More)
We report a novel digital coherent receiver based on sampling the signal in the optical domain to overcome the speed limitations of electrical analog-to-digital converters. Digital coherent receivers with aggregate optical sampling rates of up to 112 GHz are realized experimentally. The performance of such receivers is investigated in transmission(More)
We show penalty-free wavelength conversion of QPSK signals based on single-pump four-wave mixing in highly nonlinear fibre. Phase distortions due to the intentionally used pump phase modulation are compensated by electronic signal processing in the coherent receiver.
Using an alternative approach for evaluating the Bit-Error Rate (BER), we present a numerical and experimental investigation of the performance of phase-modulated optical communication systems in the presence of nonlinear phase noise and dispersion. The numerical method is based on the well known Karhunen-Lo;eve expansion combined with a linearization(More)
We experimentally generate 28-GBd 6PolSK-QPSK signals by utilizing a high-speed 4-channel DAC and an integrated dual-polarization I/Q modulator. In WDM transmission experiments over up to 4800 km standard single-mode fiber, we compare the performance of 126-Gb/s 6PolSK-QPSK and 112-Gb/s PDM-QPSK signals.