Single chip integrated spectrometers are critical to bring chemical and biological sensing, spectroscopy, and spectral imaging into robust, compact and cost-effective devices. Existing on-chip spectrometer approaches fail to realize both high resolution and broad band. Here we demonstrate a microring resonator-assisted Fourier-transform (RAFT) spectrometer, which is realized using a tunable Mach-Zehnder interferometer (MZI) cascaded with a tunable microring resonator (MRR) to enhance the resolution, integrated with a photodetector onto a single chip. The MRR boosts the resolution to 0.47 nm, far beyond the Rayleigh criterion of the tunable MZI-based Fourier-transform spectrometer. A single channel achieves large bandwidth of ~ 90 nm with low power consumption (35 mW for MRR and 1.8 W for MZI) at the expense of degraded signal-to-noise ratio due to time-multiplexing. Integrating a RAFT element array is envisaged to dramatically extend the bandwidth for spectral analytical applications such as chemical and biological sensing, spectroscopy, image spectrometry, etc.

单芯片集成光谱仪对于将化学和生物传感，光谱学和光谱成像带入坚固，紧凑且经济高效的设备至关重要。现有的片上光谱仪方法不能同时实现高分辨率和宽带。在这里，我们演示了一种微环谐振器辅助傅立叶变换（RAFT）光谱仪，该光谱仪是通过将可调谐Mach-Zehnder干涉仪（MZI）与可调谐微环谐振器（MRR）级联来实现的，以提高分辨率，并与光检测器集成到单个芯片。MRR将分辨率提高到0.47 nm，远远超出了基于可调谐MZI的傅立叶变换光谱仪的瑞利标准。单个通道以〜90 nm的大带宽实现了低功耗（MRR和1.分别为35 mW和1。MZI为8 W），但代价是由于时分复用而降低了信噪比。集成RAFT元件阵列被认为可以大大扩展光谱分析应用程序的带宽，例如化学和生物传感，光谱学，图像光谱学等。