A Non-Mechanical Multi-Wavelength Integrated Photonic Beam Steering System
A Non-Mechanical Multi-Wavelength Integrated Photonic Beam Steering System
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DOI：
10.1109/jlt.2020.3034580
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发表时间：
2021-06
影响因子：
4.7
通讯作者：
Naif Alshamrani;A. Grieco;A. Friedman;Karl A. Johnson;Myun-Sik Kim;F. Floris;P. O'Brien;Y. Fainman
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文献类型：
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作者：
Naif Alshamrani;A. Grieco;A. Friedman;Karl A. Johnson;Myun-Sik Kim;F. Floris;P. O'Brien;Y. Fainman
在这项工作中，我们实验证明了一个完全封装的一维光束转向系统，是基于一个完全CMOS兼容的硅光子平台。这种配置实现了多波长操作，适用于从光探测和测距（LIDAR）到电信和传感应用的短波红外（SWIR）应用。该系统中的交换结构采用由公共波导通过单个蚀刻输入光栅馈送的1 × 9插入/分出环谐振器阵列。交换结构将每个分出波导处的谐振波长重定向到芯片边缘处的输出面并进入自由空间。然后，除了双透镜无焦系统之外，还使用微透镜阵列（间距= 750 μm，直径= 700 μm）来准直和放大沿着沿着输出面离开波导的发散光束，以便增强填充因子并减少相邻光束之间的任何盲区。这些分出波导中的每一个用于寻址转向孔径的部分。结合在一起，他们使整个光圈转向。多波长操作通过将单独的钛钨合金（TiW）加热器放置在每个环形谐振器的顶部来实现波长调谐。
In this work we experimentally demonstrate a fully packaged one-dimensional beam steering system that is based on a fully CMOS compatible silicon photonics platform. This configuration enables multi-wavelength operation and is suitable for short-wavelength infrared (SWIR) applications from light detection and ranging (LIDAR) to telecommunication and sensing applications. The switching fabric in this system employs a 1x9 array of add/drop ring resonators that are fed by a common waveguide through a single etch input grating. The switching fabric re-directs the resonance wavelengths at each drop waveguide to the output facet at the edge of the chip and into free space. The divergent beams that exit the waveguides along the output facet are then collimated and magnified using an array of micro-lenses (pitch = 750 μm, Diameter = 700 μm) in addition to a two lens afocal system in order to enhance the fill factor and diminish any blind zones between adjacent beams. Each one of these drop waveguides is used to address portion of the steering aperture. Combined together they enable steering across the entire aperture. Multi-wavelength operation is obtained by placing individual titanium tungsten alloy (TiW) heaters on top of each ring resonator to enable wavelength tuning.