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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.
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 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.
We demonstrate ultimate linewidth-tolerant 20-Gbps QPSK homodyne transmission using a spectrum sliced Fabry-Perot laser diode signal light source. DGD tolerance was clarified, and BER characteristics less than 10-8 after 80-km transmission was successfully attained.
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