应用于相控阵雷达的光子晶体慢光波导光实时延迟线

光子化研究是相控阵雷达的发展趋势，光子晶体以其优异的集成度及光学特性在相控阵雷达光子化研究中具有广泛的应用前景。基于光子晶体波导慢光特性及热光调制原理，设计了应用于相控阵雷达波束形成网路的光实时延迟线。通过优化光子晶体慢光波导参数，所设计光子晶体光实时延迟线可实现延时量为0~36.69 ps的高精度调谐，得到23 GHz以上的延时带宽。通过优化实时延迟线群速度随温度的色散特性，温度每变化1 ℃，延时量变化量在0.36~1.57 ps/mm范围内。所提出的基于光子晶体波导的光实时延迟线，可实现延时量的高效、高精度调谐，相对于传统电域波束形成网络，具有集成度高、瞬时带宽大、调谐精度高等优点，为高频段宽带相控阵雷达波束形成网络的研发提供了理论基础。

Abstract

The photonizing research is the development trend of phased array radar. Due to its excellent characteristics on the integration level and optical properties, the photonic crystals have extensive application prospect in the photonics research of optical true time-delay lines phased array radar. Based on the slow light characteristics and thermo-optical modulation theory, optical true time-delay lines applied in beam forming network of phased array radar are proposed. By optimizing parameters of the photonic crystal slow waveguide, high accurate modulation of of photonic crystal designed ranging from 0 ps/mm to 36.69 ps/mm is achieved. Meanwhile, the delay bandwidth larger than 23 GHz is realized. By optimizing variation characteristics of the group velocity with temperature, the time delay variation is in the range from 0.36 ps/mm to 1.57 ps/mm whenever the temperature changes 1 ℃. The optical true time-delay lines based on photonic crystal proposed can achieve highly efficient and accurate modulation on the delay. Compared with the traditional electrical domain beam-forming network, it has the advantages of high integration, wide instantaneous bandwidth and high tuning accuracy, which can provide a theoretical basis for the beam-forming network research of the high frequency wideband phased array radar.

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崔乃迪, 寇婕婷, 赵恒, 曹国威, 王皖君, 郭进, 冯俊波. 应用于相控阵雷达的光子晶体慢光波导光实时延迟线[J]. 光学学报, 2016, 36(6): 0616001. Cui Naidi, Kou Jieting, Zhao Heng, Cao Guowei, Wang Wanjun, Guo Jin, Feng Junbo. Optical True Time-Delay lines of Photonic Crystal Slow Light Waveguides Used in Phased Array Radar[J]. Acta Optica Sinica, 2016, 36(6): 0616001.

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