Quadrature duobinary (QDB) spectrumshaping polarization division multiplexed-quadrature phase shift keying (PDM-QPSK) signal with Nyquist and super-Nyquist spectrum efficiency will be a promising candidate for future ...
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Quadrature duobinary (QDB) spectrumshaping polarization division multiplexed-quadrature phase shift keying (PDM-QPSK) signal with Nyquist and super-Nyquist spectrum efficiency will be a promising candidate for future ultrahigh speed ultrahigh spectrum efficiency coherent optical fiber transmissions systems. Several equalization algorithms including constant modulus algorithm (CMA), CMA plus postfilter, and cascaded multimodulus algorithm (CMMA) have been proposed as effective solutions for QDB-PDM-QPSK signal. For the first time as far as we know, the application conditions and performances for these three algorithms are analyzed and compared. System performances for a 112-Gb/s QDB-PDM-QPSK signal as a function of the optical filtering bandwidth and the optical SNR have been theoretically investigated. The results show that CMA would be the best choice in terms of convergence rate for general filtering. However, CMMA can outperform the other two schemes with a good receiver sensitivity and high-dynamic range of optical signal to noise ratio giving a strong filtering effect of super-Nyquist signaling. (C) 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
We propose and experimentally demonstrate a fiber-wireless integration system at W-band (75-100 GHz), and 80-Gbps polarization division multiplexing 16-ary quadrature amplitude modulation (QAM) signal is transmitted i...
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We propose and experimentally demonstrate a fiber-wireless integration system at W-band (75-100 GHz), and 80-Gbps polarization division multiplexing 16-ary quadrature amplitude modulation (QAM) signal is transmitted in an optical-wireless-optical system for the first time. After 50-km single-mode fiber-28 (single-mode fiber (SMF)-28) transmission, the millimeter-wave signal at 84-GHz is delivered over a 4-m 2 x 2 multiple-input multiple-output wireless link, and finally up-converted to optical signal for another 50-km SMF-28 transmission. With the optical signal-to-noise ratio of 30 dB, the bit error rate is below the forward-error-correction threshold of 3.8 x 10(-3) using cascaded multimodulus algorithm equalization at the receiver. The experimental results indicate that high-order QAM signal can be well suitable for long-haul large-capacity optical-wireless-optical transmission in the proposed system. (c) 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:9-13, 2015
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