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Single-carrier systems using coherent time-division demultiplexing and demodulation of 4-PSK, 8-PSK and 16-QAM at bit rates up to 5.1 Tb/s are reviewed. Emphasis is on transmission experiments up to 1040 km.
For the first time, up to 160 Gbaud 16-QAM and 8-PSK transmission over graded-index multimode fibre is demonstrated using optical time division multiplexing and de-multiplexing in combination with coherent detection.
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 report on a magneto- and electro-optically tuned dynamic PMD compensator that enabled error-free single-channel 160 Gb/s RZ-DPSK transmission over a 75 km SMF link (PMD>0.3T/sub Bit/). Polarization scrambling and DOP measurements were utilized to automatically adapt the compensator.
Statistical PMD compensation experiments have been performed at 160 Gb/s bitrate using a simple compensator with eye monitor feedback after demux. Even for spectral wide RZ signals a clear improvement of bit error rate by 1½ decade has been demonstrated.
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