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Journals and Conferences
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.
Single-channel transmission of 20 Gbaud single-polarization / polarization multiplexed Square 16QAM at bitrates of 80 /160 Gbit/s is experimentally demonstrated over record distances of 1300 / 1120 km.
We experimentally demonstrate the performance of back-propagation algorithm in coherently-detected 224Gb/s PM-16QAM system, over 250km of uncompensated link, and report 3.5 dB improvement in power tolerance with one back-propagation step for the entire link.
A novel coherent receiver module is presented, comprising two optical 90°-hybrids monolithically integrated with eight waveguide pin-photodiodes in balanced configuration. Superior optical performance is demonstrated in a 28 Gbaud NRZ-QPSK 150 km SMF transmission experiment.
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 have optimized multimode fiber performance at 1300 nm to a level that enables 40-Gbit/s serial transmission in the multimode regime well over 400 m in a 40 nm wavelength window with high launching tolerance
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.