Non-redundant optical phased array
Non-redundant optical phased array
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DOI：
10.1364/optica.437453
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发表时间：
2021-10-20
期刊：
影响因子：
10.4
通讯作者：
Tanemura, Takuo
中科院分区：
文献类型：
--
作者：
Fukui, Taichiro;Tanomura, Ryota;Tanemura, Takuo
光学相控阵（OPA）是一种很有前途的光束控制器件，广泛应用于光探测和测距、光学投影、自由空间光通信、光开关等领域。然而，以前报道的OPA遭受或者是可分辨点的数量不足，或者是由于极大量的移相器而导致的复杂的控制要求。为了解决这个问题，我们引入了非冗余阵列（NRA）的概念，OPA设备。基于这种设计，我们可以实现高分辨率的OPA，其可分辨点的数量与天线的数量N成二次方。相比之下，传统的OPA仅与N成线性关系。因此，可以在不牺牲可分辨点的数量的情况下实现所需移相器的数量的显著减少。我们首先调查的影响，从理论上考虑阵列布局的自相关函数采用NRA。然后，我们开发了一个基于Costas阵列的硅OPA和实验证明了2D波束转向与类似的19,000个可分辨的点，仅使用127个移相器。据我们所知，这对应于OPA在不扫描波长的情况下实现的最大数量的可分辨点。(C)2021年美国光学学会根据OSA开放获取出版协议的条款
Optical phased arrays (OPAs) are promising beam-steering devices for various applications such as light detection and ranging, optical projection, free-space optical communication, and optical switching. However, previously reported OPAs suffer from either an insufficient number of resolvable points, or complicated control requirements due to an extremely large number of phase shifters. To solve this issue, we introduce the non-redundant array (NRA) concept to the OPA devices. Based on this design, we can realize high-resolution OPAs whose number of resolvable points scales quadratically with the number of antennas N. In contrast, that of traditional OPAs scales only linearly with N. Thus, a significant reduction in the number of required phase shifters can be attained without sacrificing the number of resolvable points. We first investigate the impact of employing the NRA theoretically by considering the autocorrelation function of the array layout. We then develop a Costas-array-based silicon OPA and experimentally demonstrate 2D beam steering with similar to 19,000 resolvable points using only 127 phase shifters. To the best of our knowledge, this corresponds to the largest number of resolvable points achieved by an OPA without sweeping the wavelength. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement