41.7-Gb/s D-band signals wireless delivery over 4.6 km distance based on photonics-aided technology

In this paper, we propose and experimentally demonstrate a D-band photonics-aided long-distance and largecapacity wireless transmission system. Based on photonics-aided millimeter wave communication technology, advanced equipment, and an advanced digital signal processing (DSP) algorithm, we have successfully realized the wireless transmission of a 15G baud PS-16QAM signal in the D-band of 4.6 km. At the transmitting end, the probability shaping (PS) technique and the truncated probability shaping (TPS) technique are introduced to alleviate the nonlinear impairment introduced by the photoelectric/electro-optic (OE/EO) conversion. Meanwhile, a high-gain power amplifier (PA) and a pair of self-designed polytetrafluoroethylene (PTFE) lenses are used to achieve long-distance transmission. At the receiving end, the Volterra nonlinear equalization (VNE) algorithm based on the multiple-input-multiple-output (MIMO) structure is deployed to compensate the residual I/Q imbalance impairment and nonlinear impairment. By utilizing this advanced equipment and DSP algorithms, a 4.6 km wireless transmission with a net bit rate of 41.7 Gb/s has been successfully realized over D-band, and its bit error rate (BER) is below the 25 % soft-decision forward error correction (SD-FEC) threshold of 4.2 x 10-2. The product of the net bit rate and wireless transmission distance has reached a record 41.7 Gb/s x 4.6 km = 191.8 Gb/s & sdot;km. As far as we know, this is the first experimental demonstration of a net rate exceeding 40 Gb/s in a D-band long-distance transmission system.