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arXiv 2002.06781physics.opticsphysics.app-ph
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用于可扩展的集成光子LIDAR光束转向的串联光学相控阵列

Serpentine optical phased arrays for scalable integrated photonic LIDAR beam steering

Nathan Dostart, Bohan Zhang, Anatol Khilo, Michael Brand, Kenaish Al Qubaisi, Deniz Onural, Daniel Feldkhun, Kelvin H. Wagner, Miloš A. Popović

备注：
Nathan Dostart and Bohan Zhang contributed equally to this work. Main text and supplementary material in the same document. 11 pages and 11 figures total
发表信息：
Optica 7 (2020) 726-733
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摘要：

在集成光子电路中实现的光学相控阵（OPA）可以实现各种3D传感、成像、照明和测距应用，以及它们在新的LIDAR技术中的融合。然而，当前的集成OPA方法在控制复杂性、功耗和光学效率方面不能扩展到支持中远程LIDAR所需的大孔径尺寸。我们提出的蛇形光学相控阵列（SOPA），一个新的OPA概念，解决这些根本性的挑战，并使架构，可扩展到大孔径。SOPA基于低损耗光栅波导的串联互连阵列，并支持完全无源的二维（2D）波长控制光束转向。一个从根本上节省空间的设计，将馈电网络折叠到孔径中，还可以将SOPA可扩展地平铺到具有高填充因子的大孔径中。我们通过实验证明了第一个SOPA，使用1450 - 1650 nm波长扫描在27 x610阵列中产生16，500个可寻址点。我们还首次展示了来自单个硅光子芯片上的两个独立OPA的光束的远场干涉，作为基于新型主动孔径合成方案的远程计算成像激光雷达的第一步。

英文摘要：

Optical phased arrays (OPAs) implemented in integrated photonic circuits could enable a variety of 3D sensing, imaging, illumination, and ranging applications, and their convergence in new LIDAR technology. However, current integrated OPA approaches do not scale - in control complexity, power consumption, and optical efficiency - to the large aperture sizes needed to support medium to long range LIDAR. We present the serpentine optical phased array (SOPA), a new OPA concept that addresses these fundamental challenges and enables architectures that scale up to large apertures. The SOPA is based on a serially interconnected array of low-loss grating waveguides and supports fully passive, two-dimensional (2D) wavelength-controlled beam steering. A fundamentally space-efficient design that folds the feed network into the aperture also enables scalable tiling of SOPAs into large apertures with a high fill-factor. We experimentally demonstrate the first SOPA, using a 1450 - 1650 nm wavelength sweep to produce 16,500 addressable spots in a 27x610 array. We also demonstrate, for the first time, far-field interference of beams from two separate OPAs on a single silicon photonic chip, as an initial step towards long-range computational imaging LIDAR based on novel active aperture synthesis schemes.

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