Abstract

We propose and experimentally demonstrate a novel scheme to generate ultrahigh-order frequency multiplied millimeter-wave (mm-wave) signals with high fidelity enabled by angle modulation (ANG-M). The constant envelope (CE) characteristic of the ANG-M signal makes it possible to avoid nonlinear distortion induced by photonic frequency multiplication. In addition, the theoretical formula and the simulation results prove that the modulation index (MI) of the ANG-M signal increases along with frequency multiplication, so as to improve the signal-to-noise ratio (SNR) of the frequency-multiplied signal. In the experiment, we confirm the SNR of the 4-fold signal is enhanced by 2.1 dB approximately for the increased MI compared to the 2-fold signal. Finally, a 6-Gb/s 64-QAM signal with a carrier frequency of 30 GHz is generated and transmitted over 25-km standard single-mode fiber (SSMF) using only a 3-GHz radio frequency signal and 10-GHz bandwidth Mach–Zehnder modulator. To the best of our knowledge, it is the first time that a 10-fold frequency-multiplied 64-QAM signal with high fidelity is generated. The results prove that the proposed method will be a potential solution for low-cost mm-wave signal generation in future 6G communication.

© 2023 Optica Publishing Group

Dual high-order QAM-modulated mm-wave signal transmission in the Q-band enabled by simple IM/DD architecture and bandpass delta-sigma modulation

Hengxin Yan, Xinying Li, Xiaolong Pan, Tangyao Xie, Liye Fang, Jiahao Bi, Han Jiang, and Xiangjun Xin
Opt. Lett. 49(8) 1919-1922 (2024)

Virtual-carrier-assisted 12 Gb/s 64QAM millimeter-wave signal transmission at 30 GHz using a 4-bit digital-to-analog converter

Chuanming Huang, Hugui Jin, Mengfan Cheng, Qi Yang, Ming Tang, Deming Liu, and Lei Deng
Opt. Lett. 48(4) 1076-1079 (2023)

65,536-QAM OFDM signal transmission over a fiber-THz system at 320 GHz with delta-sigma modulation

Junting Shi, Jianjun Yu, Jiao Zhang, Min Zhu, Long Zhang, Kaihui Wang, Wen Zhou, Tangyao Xie, and Jianguo Yu
Opt. Lett. 48(8) 2098-2101 (2023)

Dual vector millimeter-wave signal generation based on optical carrier suppression modulation and direct detection with one photodetector

Jiahao Bi, Tangyao Xie, Dong Guo, Xinying Li, Xiaolong Pan, Hengxin Yan, Jie Hou, Zhipei Li, Chenchen Wang, Qi Zhang, Ran Gao, Ze Dong, and Xiangjun Xin
Opt. Lett. 49(5) 1205-1208 (2024)

Photonic-aided W-band dual-vector RF signal generation and detection enabled by bandpass delta-sigma modulation and heterodyne detection

Xiaolong Pan, Di Wu, Xinying Li, Dong Guo, Zhipei Li, Hengxin Yan, Chenchen Wang, Jiahao Bi, Chao Yu, Xinyu Liu, Xiangjun Xin, Qi Zhang, Ran Gao, and Ze Dong
Opt. Lett. 48(8) 2146-2149 (2023)