In this paper, we demonstrate a high-sensitivity and real-time heterodyne coherent optical transceiver for intraplane satellite communication, without digital-to-analog converter (DAC) devices and an optical phase lock loop (OPLL). Based on the scheme, a real-time sensitivity of -49 dBm is achieved at 5 Gbps QPSK. Because DAC is not needed at the transmitter, as well as OPLL at the receiver, this reduces the system cost. Furthermore, the least required Rx ADC bit-width is also discussed. Through theoretical analysis and experimental results, our cost-effective transceiver satisfies the scenario and could be a promising component for future application.

This article presents an 8-element dual-polarized phased-array transceiver (TRX) front-end IC for millimeter-wave (mm-Wave) 5G new radio (NR). Power enhancement technologies for power amplifiers (PA) in mm-Wave 5G phased-array TRX are discussed. A four-stage wideband high-power class-AB PA with distributed-active-transformer (DAT) power combining and multi-stage second-harmonic traps is proposed, ensuring the mitigated amplitude-to-phase (AM-PM) distortions across wide carrier frequencies without degrading transmitting (TX) power, gain and efficiency. TX and receiving (RX) switching is achieved by a matching network co-designed on-chip T/R switch. In each TRX element, 6-bit 360° phase shifting and 6-bit 31.5-dB gain tuning are respectively achieved by the digital-controlled vector-modulated phase shifter (VMPS) and differential attenuator (ATT). Fabricated in 65-nm bulk complementary metal oxide semiconductor (CMOS), the proposed TRX demonstrates the measured peak TX/RX gains of 25.5/21.3 dB, covering the 24?29.5 GHz band. The measured peak TX OP1dB and power-added efficiency (PAE) are 20.8 dBm and 21.1%, respectively. The measured minimum RX NF is 4.1 dB. The TRX achieves an output power of 11.0?12.4 dBm and error vector magnitude (EVM) of 5% with 400-MHz 5G NR FR2 OFDM 64-QAM signals across 24?29.5 GHz, covering 3GPP 5G NR FR2 operating bands of n257, n258, and n261.

针对大型激光装置中广空间分布的甚多路高精度（一是长时间时间抖动小于5 ps，二是时间延迟微步进分辨率小于15 ps）同步触发信号的需求，设计了一种“数据流编解码光传输+高速串行收发器粗延时+宽带微带线微步进延时”的同步时序产生方案。通过数据流编解码光传输架构实现了广空间范围内时序的对齐；高速串行收发器粗延时和微带线微步进延时技术解决了同步触发信号低时间抖动和高延迟分辨的问题。通过对系统的时序逻辑和电路板的关键线路进行仿真，完成了整个系统的设计与研制，并开展了实验测试。测试结果表明：该系统可以实现广空间范围内的同步时序信号产生，同步触发信号的时间抖动精度优于3.76 ps（均方根值，8 h），39.6 ps（峰峰值，8 h），时间延迟分辨率优于15 ps；若应用于小空间范围，同步触发信号的时间精度可优于1.27 ps（均方根值，8 h），12.4 ps（峰峰值，8 h）。

针对太赫兹通信及成像等系统对高集成度射频收发链路的需求, 在自主研制的太赫兹肖特基二极管的基础上, 建立了器件的精确模型, 设计并制备出基于二极管的倍频/混频单片集成芯片, 解决了传统二极管装配难度大、一致性差的难题, 提高了器件的性能。成功研制出170 GHz、340 GHz倍频器和340 GHz混频器模块, 并且开发出集成化的340 GHz发射与接收链路。发射端一体化模块实现了342 GHz功率为22 mW的输出, 接收端一体化模块实现了330～350 GHz单边带变频损耗在10 dB上下。该模块的开发为未来太赫兹通信及成像技术的应用奠定基础。

针对当前照射制导设备数据传输能力存在的问题，文章提出了一种基于串并收发器技术、传输速率为2.5 Gbit/s的光电通信系统设计。该设计以串并收发器为核心，采用光纤传输与现场可编程门阵列（FPGA）软件结合的方式对网络报文控制数据、状态采样数据和同步时序信号等不同速率和接口形式的数据进行组帧和解帧处理，最终实现了高速光电系统的通信。测试结果表明，该系统大幅提升了阵面数据信息的传输和处理速率，同时降低了传统阵面与地面通信系统的硬件设备数量和繁杂度，突破了阵面与地面间的传输距离限制。

对基于混合波束赋形的系统架构进行了研究。提出了新型的混合波束赋形架构，并采用高集成宽带收发芯片AD9361与全可编程片上系统进行多通道数字中频系统的搭建。测试结果表明该方案稳定可靠，满足大带宽高速传输的需求。