Fiber-wireless integration for 80 Gbps polarization division multiplexing -16QAM signal transmission at W-band without rf down conversion

We propose and experimentally demonstrate a fiberwireless 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 × 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.