Delivering dual polarization-division-multiplexing millimeter-wave signals at W-band by one pair of antennas

We propose and experimentally demonstrate a novel seamless fiber-wireless-integration system (FWI) to deliver up to 120-Gb/s (9∼15-Gbaud) polarization-division-multiplexing 16-ary quadrature-amplitude-modulation (PDM-16QAM)/40-Gb/s (5∼12-Gbaud) quadrature-phase-shift-keying (PDM-QPSK) signal over 10-km/20-km single-mode fiber-28 (SMF-28) and 0.6-cm/13-m, 300-m and 1-km 2 × 2 multi-input multi-output (MIMO) wireless link at W-band, realized by antenna polarization multiplexing and photonic millimeter-wave (mm-wave) generation techniques. With reduction of system size-based hardware complexity and power consumption, it is more convenient for the system adopting antenna polarization multiplexing to be installed and maintained. For simplification of network architecture, apart from being deployed as multiplexer/de-multiplexer, two ortho-mode transducer devices are used to be a pair of panel antennas at both the transmitter and the receiver sides in the scheme of the short-haul wireless link employing PDM-16QAM signal. The bit error ratio (BER) is less than the new-generation forward-error-correction (eFEC) threshold of 2 × 10⁻² with CMA algorithm for equalization.