Gratingless integrated tunneling multiplexer for terahertz waves
Gratingless integrated tunneling multiplexer for terahertz waves
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DOI：
10.1364/optica.420715
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发表时间：
2021-05-20
期刊：
影响因子：
10.4
通讯作者：
Nagatsuma, Tadao
中科院分区：
文献类型：
--
作者：
Headland, Daniel;Withayachumnankul, Withawat;Nagatsuma, Tadao
阵列波导光栅（AWG）是一种用途广泛、可扩展的无源光子复用器。然而，波导阵列的必要性产生大的设备尺寸，并且光栅总是将有限的功率转换成不期望的衍射级。在这里，我们展示了AWG的功能，没有光栅或波导阵列，产生的好处，紧凑性，带宽和效率。为此，我们利用从电介质波导到相邻平板的光隧穿，以实现平板限制的频率扫描光束，这是操纵使用平板波束成形技术，我们已经开发，以分离不同的频带。通过这种方式，我们设计了一个全本征硅集成的4 × 1频分太赫兹复用器，它被证明支持聚合数据速率高达48 Gbit/s的开关键控调制方案，工作在350 GHz附近。我们的调查目标是太赫兹范围，为未来的大容量无线通信网络提供关键的缺失构建块。(C)根据OSA开放获取出版协议的条款，2021年美国光学学会
The arrayed waveguide grating (AWG) is a versatile and scalable passive photonic multiplexer that sees widespread usage. However, the necessity of a waveguide array engenders large device size, and gratings invariably commute finite power into undesired diffraction orders. Here, we demonstrate AWG-like functionality without a grating or waveguide array, yielding benefits to compactness, bandwidth, and efficiency. To this end, we exploit optical tunneling from a dielectric waveguide to an adjacent slab in order to realize a slab-confined frequency-scanning beam, which is manipulated using in-slab beamforming techniques that we have developed in order to separate distinct frequency bands. In this way, we devise an all-intrinsic-silicon integrated 4 x 1 frequency-division terahertz multiplexer, which is shown to support aggregate data rates up to 48 Gbit/s with an on-off-keying modulation scheme, operating in the vicinity of 350 GHz. Our investigation targets the terahertz range, to provide a critical missing building block for future high-volume wireless communications networks. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement