光子集成射频自干扰消除系统性能仿真分析

针对全双工通信系统设计了光子集成射频自干扰消除功能芯片.该芯片采用相位调制将射频信号转换至光域，在光域内进行光载射频信号的幅相调控以实现干扰对消功能.对功能芯片中主要功能单元进行优化设计后，延时调谐范围为0~10 ps, 30 GHz带宽内的延时抖动小于0.1 ps; 滤波响应阻带抑制度为36.5 dB，通带带宽为60.6 GHz，边沿陡峭度为9.2 dB/GHz.建立了光子集成芯片射频自干扰消除系统的理论模型，对功能芯片中可调光延时线、可调光衰减器及滤波器等引入的延时、幅度不匹配对系统消除性能的影响进行了仿真分析.结果表明，幅度失配量为0.02 dB时，2 GHz带宽信号下系统抑制度为-42.7 dB; 延时抖动为0.07 ps时，2 GHz带宽信号下系统的抑制度为-37 dB.研究结果可为光子集成射频干扰抑制功能芯片的研制提供参考.

Abstract

A photonic integrated radio frequency self-interference cancellation chip is designed for full-duplex communication. The radio frequency signals are converted into the optical domain by phase modulation, and the amplitude and phase tuning of the optical carried radio frequency signals is implemented to realize the radio frequency self-interference cancellation function. The optimally designed structural parameters of the cascaded ring are presented. The time delay tuning range is 0 to 10 ps with the delay jitter less than 0.1 ps over 30 GHz bandwidth. For filtering response, the stopband rejection is 36.5 dB, the passband bandwidth is 60.6 GHz, and the steepness of the edge is 9.2 dB/GHz. The theoretical model of the photonic integrated radio frequency self-interference cancellation system is established. The influence of time delay and amplitude mismatch caused by optical delay line, tunable optical attenuator and filter on the radio frequency self-interference cancellation performance is analyzed. With the amplitude mismatch of 0.02 dB, the cancellation depth is -42.7 dB over the bandwidth of 2 GHz. With the time delay deviation of 0.07 ps, the cancellation depth is -37 dB over the bandwidth of 2 GHz. This work paves the way for fabricating the photonic integrated function chip.

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申芳芳, 苏鑫鑫, 付双林, 李朝, 杨思成, 武震林, 谷一英, 谭庆贵, 朱舸, 赵明山, 韩秀友. 光子集成射频自干扰消除系统性能仿真分析[J]. 光子学报, 2019, 48(11): 1148017. SHEN Fang-fang, SU Xin-xin, FU Shuang-lin, LI Chao, YANG Si-cheng, WU Zhen-lin, GU Yi-ying, TAN Qing-gui, ZHU Ge, ZHAO Ming-shan, HAN Xiu-you. Simulation and Performance Analysis of Photonic Integrated RF Self-interference Cancellation System[J]. ACTA PHOTONICA SINICA, 2019, 48(11): 1148017.

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