Miniaturized integrated spectrometer using a silicon ring-grating design
Miniaturized integrated spectrometer using a silicon ring-grating design
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DOI：
10.1364/oe.424443
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发表时间：
2021-05-10
期刊：
影响因子：
3.8
通讯作者：
Fainman, Yeshaiahu
中科院分区：
文献类型：
--
作者：
Alshamrani, Naif;Grieco, Andrew;Fainman, Yeshaiahu
我们介绍和实验演示了一个小型化的集成光谱仪在短波长红外（SWIR）光谱，结合了一个添加-下降环谐振器窄带滤波器与分布式布拉格反射器（DBR）的宽带滤波器实现在硅光子平台的宽带工作。该设计中的反向耦合DBR滤波器由一对波导侧壁光栅组成，其用作宽带滤波器（即，3.9 nm）。重定向的光束然后被馈送到用作窄带滤波器的环形谐振器（即，0.121纳米）。在该方案中，通过使用DBR作为滤波器来隔离单个环形谐振线，克服了环形谐振器的自由光谱范围（FSR）限制。通过热光效应同时调谐两个组件，进一步简化了光谱仪的整体设计。此外，具有不同中心波长的多个环形光栅光谱仪单元可以级联堆叠，以覆盖更宽的光谱带宽。这可以通过将每个单位单元居中在不同的中心波长上来完成，使得一个单位单元的最大范围对应于下一个单位单元的最小范围。这种配置能够在大光谱带宽和高消光比（ER）上实现高光谱分辨率，使其适用于各种应用。(C)根据OSA开放获取出版协议的条款，2021年美国光学学会
We introduce and experimentally demonstrate a miniaturized integrated spectrometer operating over a broad bandwidth in the short-wavelength infrared (SWIR) spectrum that combines an add-drop ring resonator narrow band filter with a distributed Bragg reflector (DBR) based broadband filter realized in a silicon photonic platform. The contra-directional coupling DBR filter in this design consists of a pair of waveguide sidewall gratings that act as a broadband filter (i.e., 3.9 nm). The re-directed beam is then fed into the ring resonator which functions as a narrowband filter (i.e., 0.121 nm). In this scheme the free spectral range (FSR) limitation of the ring resonator is overcome by using the DBR as a filter to isolate a single ring resonance line. The overall design of the spectrometer is further simplified by simultaneously tuning both components through the thermo-optic effect. Moreover, several ring-grating spectrometer cells with different central wavelengths can be stacked in cascade in order to cover a broader spectrum bandwidth. This can be done by centering each unit cell on a different center wavelength such that the maximum range of one-unit cell corresponds to the minimum range of the next unit cell. This configuration enables high spectral resolution over a large spectral bandwidth and high extinction ratio (ER), making it suitable for a wide variety of applications. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement