灵活栅格大容量光子太赫兹通信关键技术研究

Terahertz (THz) communication is considered as the frontier of implementing high capacity wireless communication beyond 100Gbit/s, eventually up to Tbit/s. In this project, we propose to develop key enabling technologies of THz photonics wireless communication system at 400Gbit/s data rate, based on our previous state-of-the-art demonstrations. A scheme of generating and stabilizing THz optical comb is proposed in this project to improve the stability of THz signals, so as to conceive a stable, tunable THz photonic source with low phase noise. Furthermore, we propose to configure THz channels by employing flex-grid and appropriate modulation formats, in order to increase spectral efficiency, as well as decrease propagation distortion and the degradation of signal-to-noise ratio (SNR) of ultrafast THz signals. A new technique of performing digital equalization base on a coherence THz pilot tone is proposed to decrease the perturbation of phase noise on the high capacity THz signals, and to improve system performance, and hence overcoming the challenges in receiving weak THz signals and enabling the successful wireless transmission of ultrafast THz signals. The implementation of this project will lead to driving the development of THz wireless communication technologies and their applications in many relevant areas.

太赫兹通信是实现100Gbit/s以上甚至Tbit/s大容量无线通信的前沿技术。在申请人前期对太赫兹高速通信系统的研究基础上，本项目研究支撑高达400Gbit/s的光子太赫兹通信系统及其关键技术。通过研究太赫兹光学频疏的产生和稳定方法，提高太赫兹信号的稳定性，实现稳定的可调谐低相位噪声光子太赫兹源；通过研究太赫兹信道的灵活栅格和优化配置机制，提高系统整体频带的使用效率，有效减小大容量太赫兹信号的传输失真和信噪比传输损失；通过研究基于相干太赫兹导频的数字均衡接收技术，降低相位噪声对超高速信号的随机干扰，进一步提高系统的接收性能，克服太赫兹微弱信号接收的技术困难，从而实现大容量太赫兹信号的可靠传输。本项目研究对我国太赫兹通信技术的进步和太赫兹通信相关应用领域的发展有重要意义。

太赫兹通信是支撑下一代大容量无线通信的前沿技术。光子学技术在发展超高速太赫兹通信中具有明显优势，在实现下一代高速光-无线接入网络中将扮演重要角色。本项目重点研究了基于光频疏的相干光子太赫兹产生方法，实现了可调谐低相位噪声光子太赫兹源；通过研究太赫兹相位噪声、非线性的先进数字估计补偿算法，不但有效提升了系统容量，而且克服了光子太赫兹通信系统在微弱功率约束下传输距离扩展的困难。项目还研究了具有抗非线性的概率整形高效调制机制，提高系统整体频带的使用效率，有效减小大容量太赫兹信号的传输失真和信噪比损伤。通过相关关键技术的研究，项目结合多维度复用技术，在300GHz以上频段多次实现了超100Gbps大容量光子太赫兹通信传输，分别实现了通信速率1000Gbps，131Gbps，600Gbps和1059Gbps。项目成果指标国际领先，该项目研究对我国太赫兹通信技术的进步和太赫兹通信相关应用领域的发展有十分重要的意义。