W-band RoF polarization multiplexing system supports 1048576 QAM with delta-sigma modulation

Article Engineering, Electrical & Electronic

8192QAM Signal Transmission by an IM/DD System at W-Band Using Delta-Sigma Modulation

Jiaxuan Liu et al.

Summary: We propose a low-cost IM/DD system for transmitting high-order QAM signals at 87 GHz MMW band. The system utilizes photon-assisted MMW generation techniques and low-cost envelope detection for signal transmission and reception. DMT signals up to 8192QAM are modulated into a one-bit quantized OOK signal with DSM to avoid envelope detector saturation effects and reduce nonlinear noise interference. This is the first time DSM modulation format is used in IM/DD W-band wireless transmission system.

IEEE PHOTONICS TECHNOLOGY LETTERS (2023)

Add to Collection

Article Optics

OFDM-PS-256QAM signal delivery at 47.45 Gb/s over 4.6-kilometers wireless distance at the W band

Weiping Li et al.

Summary: Photonics technology is a promising approach for generating high-frequency millimeter waves and enabling the convergence of fiber-optic and wireless communication. This study achieved a significant breakthrough by demonstrating a photonics-aided system in the W band, achieving a transmission rate of 47.45 Gb/s over a wireless distance of 4.6 km, with a spectral efficiency of 4.97 bit/s/Hz. These results provide valuable insights for improving the transmission distance and data rate of radio-over-fiber systems, and have implications for the future beyond the 5G era.

OPTICS LETTERS (2022)

Add to Collection

Article Optics

Hybrid fiber-THz fronthaul supporting up to 16384-QAM-OFDM with the delta-sigma modulation

Lu Zhang et al.

Summary: With the advancement of high-capacity wireless access networks, the deployment of ultra-dense small cells in urban areas is increasing rapidly. This creates a challenge in deploying a large number of optical fibers in urban areas. To address this issue, a hybrid fiber-terahertz mobile fronthaul system is proposed in this study, which enables flexible and high-order wireless signal transmission.

OPTICS LETTERS (2022)

Add to Collection

Article Engineering, Electrical & Electronic

Delivery of Polarization-Division-Multiplexing Wireless Millimeter-Wave Signal Over 4.6-km at W-Band

Feng Wang et al.

Summary: In this paper, we propose and establish a large-capacity, long-distance wireless signal delivery system at W-band based on photonics-aided mm-wave generation technology, polarization-division-multiplexing (PDM), and advanced devices. We demonstrate the successful wireless transmission of 10-Gbaud PDM-QPSK, PDM-16QAM, and PDM-PS-64QAM mm-wave signals in the W-band.

JOURNAL OF LIGHTWAVE TECHNOLOGY (2022)

Add to Collection

Article Engineering, Electrical & Electronic

Digital Mobile Fronthaul Based on Performance Enhanced Multi-Stage Noise-Shaping Delta-Sigma Modulator

Ke Bai et al.

Summary: A novel topology MASH delta-sigma modulator is proposed for enhancing noise-shaping capacity, and detailed comparison with traditional structures is presented. Experimental results show significant performance improvement of the proposed new topology MASH in a 20-km digital mobile fronthaul system.

JOURNAL OF LIGHTWAVE TECHNOLOGY (2021)

Add to Collection

Article Optics