W-Band 8QAM Vector Millimeter-Wave Signal Generation Based on Tripling of Frequency Without Phase Pre-Coding

Abstract

In this paper, we propose a W-band 8-quadrature-amplitude-modulation (8QAM) frequency tripling photonic vector millimeter-wave (mm-wave) signal generation method by using a phase modulator (PM) with only amplitude pre-coding. The PM is driven by 2-Gbaud 8QAM-modulated amplitude precoded signal at 25 GHz. Instead of phase pre-coding, we only need to reverse the real part of the signal at the receiver after photo detector (PD). The structure of the transmitter and the structure of the receiver are simple. The frequency tripling scheme is completed by numerical simulation, the output optical spectrum is consistent with the theoretical analysis, and bit-error-ratio (BER) curves indicate that the put forward 75 GHz 8QAM vector signal generation technique has good performance. The BER of 6 Gbit/s 75 GHz 8QAM vector mm-wave signal is below 3.8 × 10 −3 after 12 km optical fiber transmission. For all we know, it is the first time to report on the generation of high-order QAM photonic mm-wave signal with odd times of RF frequency by using a single external modulator. INDEX TERMS Millimeter wave, frequency multiplication, phase modulation, digital signal processing, quadrature amplitude modulation. LUN ZHAO received the M.S. degree in communication and information system from the Wuhan Research Institute (WRI), Hubei, China, in 2012, and the Ph.D. degree in electronic science and technology from the School of electronic engineering, Beijing University of Posts and Telecommunications, Beijing, China, in 2016. He is currently working in information and telecommunication engineering with the Ubiquitous Wireless Communication Technology Team, Chongqing University of Posts and Telecommunications. His research interests include radio over fiber, coherent optical communication, machine learning/deep learning in optical communication, optical physical layer security, and 5G mobile networks. LIAN XIONG was born in Huanggang, Hubei, China, in 1985. He received the B.S. degree in telecommunications engineering from the North University of China, Taiyuan, China, in 2008, the M.S. degree in communication and information system from the Taiyuan University of Technology, Taiyuan, in 2011, and the Ph.D. degree in communication and information system from

W band vector millimeter‐wave signal generation based on a new photonic frequency quadrupling without optical filter

“…The rapid growth of business traffic has caused severe challenges to mobile communication. Due to the increasing shortage of medium and low‐frequency radio spectrum resources and the urgent demand for high‐speed wireless broadband access, people turn their attention to the high‐frequency millimeter‐wave (mm‐wave) band with more abundant spectrum resources, which is ranging from 30 to 300 GHz 1–8 . However, due to the limited bandwidth and other electronic bottlenecks, it would meet a more difficult and challenge to generate mm‐wave signals based on traditional electrical methods 9–12 …”

“…Due to the increasing shortage of medium and low-frequency radio spectrum resources and the urgent demand for high-speed wireless broadband access, people turn their attention to the high-frequency millimeter-wave (mm-wave) band with more abundant spectrum resources, which is ranging from 30 to 300 GHz. [1][2][3][4][5][6][7][8] However, due to the limited bandwidth and other electronic bottlenecks, it would meet a more difficult and challenge to generate mm-wave signals based on traditional electrical methods. [9][10][11][12] To solve these defects, photonic-assisted mm-wave generation schemes using external modulator and frequency multiplication technology are proposed.…”

A Continuously Tunable and Filter-Less QPSK Modulated Millimeter-Wave Signal Generation with Frequency Quadrupling Just Based on an MZM

“…It is the main carrier in 5G and the next generation mobile communication network. Today, with the increasing shortage of spectrum resources, it has attracted more and more attention of scientists and scholars [11][12][13][14][15][16][17][18][19]. However, due to the limited bandwidth and other electronic bottlenecks, it would be more challenging to generate millimeter wave signals based on traditional methods [20][21][22][23].…”

Generation of (3, 1) Vector Signal Based on Probabilistic Shaping Technology without Precoding

“…e radio-over-fiber (ROF) communication combines optical communication and wireless transmission, which offers the advantages of high bandwidth, low loss, low power consumption, and flexible operation [1][2][3][4][5][6]. Besides, the vector modulation format has high spectral efficiency and allows more information to be transmitted in a limited bandwidth, thus reducing the bandwidth requirements on optical devices [7].…”

“…Besides, the vector modulation format has high spectral efficiency and allows more information to be transmitted in a limited bandwidth, thus reducing the bandwidth requirements on optical devices [7]. e transmission capability is effectively increased by the vector modulation in the ROF system, and it is widely used to drive external modulators using low-cost radio frequency (RF) signals, which generate more stable photonic vector signals based on the optical carrier suppression (OCS) technique [3][4][5][6].…”