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10-Gbit/s 16-QAM transmission over 160 km with a single dual-drive Mach-Zehnder modulator was experimentally demonstrated. We achieved BER <; 10-9 in a BtB condition and <; 10-7 after the transmission. Electronic pre-equalization was employed to suppress signal distortion.
30 Gbit/s (5 Gsymbol/s) 64-QAM real-time transmission over 60 km SSMF without any dispersion compensation has been experimentally demonstrated for the first time. Intersymbol interference caused by the limited frequency bandwidth of electrical components in the transmitter and receiver was compensated using a pre-equalisation technique based on electronic digital processing. Phase-noise cancelling...
Linewidth-tolerant 30-Gbit/s (5-Gsymbol/s) 64-QAM real-time transmission over 60-km SSMF without any dispersion compensation was experimentally demonstrated by ISI-suppression based on electronic digital processing and pilot-carrier aided optical phase-noise cancelling for the first time.
2.5-Gsymbol/s 64-QAM transmission over 120-km standard-SMF was demonstrated by electronic pre-equalization for ISI supression and pilot-carrier aided optical phase-noise cancelling to obtain the BER of <10-7.
We investigated the performance of electronic pre-equalization to compensate for ISI caused in a vector modulator for 5 Gsymbol/s 64QAM. Drastic improvement in the constellation was experimentally confirmed.
Linewidth tolerant 2.5-Gsymbol/s (10-Gbit/s) 16-QAM real-time modulation/demodulation of BER of less than 10-9 was experimentally demonstrated using a DFB-LD with a linewidth of 30-MHz.
We investigated the performance of electric pre-equalization to compensate inter-symbol-interference (ISI) caused in electrical multilevel 16-QAM to a standard vector modulator. Drastically clear constellation was obtained experimentally by applying 16-taps finite impulse response filter technique.
We investigated the performance of electronic pre-equalization to compensate for inter-symbol-interference in electrical 16-QAM in a vector modulator. Drastic improvement in the constellation was experimentally confirmed by applying digital filtering with the minimum necessary taps.
We demonstrated 40-Gbit/s 16-QAM real-time modulation/demodulation using electrical digital pre-equalization and a pilot-carrier to obtain phase-noise tolerant characteristics with BERs of <10-9 using a 200-kHz EC-LD and <10-7 using a 30-MHz DFB-LD.
We investigated the phase noise-tolerance of coherent detection in a high-efficiency optical fiber transmission using 256-QAM formats at 80 Gb/s by computer simulation. We confirmed that the proposed scheme has a phase noise tolerance with DGD.
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