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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.
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 describe an electronic dispersion compensator (EDC)-IC that consists of adaptive FFE with an integrated dispersion monitor, optimized for 10-Gb/s ODB transmission. The dispersion tolerance has been successfully enhanced, while simplified circuitry has enabled size reduction, low power consumption, and high controllability.
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.
Ultimately phase-noise tolerant multilevel homodyne technique without using offline signal processing has been demonstrated. The technique will allow us to use 30-MHz linewidth LD even for 80-Gb/s 256-QAM format so long as DGD is compensated.
We theoretically and experimentally discussed a low cost system using an LD direct optical modulator that can re-transmit UHF band terrestrial digital TV signals (eight channels) sent via several hundred optical fiber networks. Optimum light modulation, required light input power at the photo detector, and influence of IM3 produced by the nonlinear optical effect of optical fibers are discussed. We...
Linewidth-tolerant QPSK self-homodyne transmission has been demonstrated at 20 Gb/s using a polarization-multiplexed pilot carrier. No degradation in receiver sensitivity up to a linewidth of 30 MHz and error-free 160-km transmission were achieved.
The first 1 Gbit/s, automatic-power-control-free zero-bias modulation has been successfully demonstrated using very low-threshold GaAs/AlGaAs MQW lasers. A stable multi-longitudinal mode oscillation due to zero-bias modulation was also observed. This result simplifies driving circuitry and is an important step towards realisation of high-speed and high-density optoelectronic integrated circuits.
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