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Integrated Multimode Waveguide with Photonic Lantern for Speckle Spectroscopy
IEEE Journal of Quantum Electronics ( IF 2.5 ) Pub Date : 2021-02-01 , DOI: 10.1109/jqe.2020.3037410
Dan Yi , Yaojing Zhang , Xinru Wu , Hon Ki Tsang

We propose a high-resolution compact spectrometer based on a multimode waveguide (MMW) integrated with a planar photonic lantern (PL). Four modes were launched into the MMW via asymmetric directional couplers (ADCs) and individually switched by four modulators. The mode field of the MMW was spatially sampled by four separate detectors. Measurement of the 64 possible states (16 switch states $\times $ 4 modes) allowed the spectrum of the optical signal to be recovered. Experimentally, we demonstrated spectral correlation width of 0.16-nm in the measurement at 1560 nm using a MMW with 0.5 mm length for both sparse and continuous spectra retrieval. To scale up, the spectrometer resolution can be estimated by $\delta ~\lambda = \lambda ^{\mathbf {2}} / \Delta ~{n} _{\mathbf {eff}}~{L}$ while the operational bandwidth can be estimated to be $2^{\mathbf {N}} \times {N} \times \delta \,\,\lambda $ , with ${N}$ denoting the number of modes supported in the whole system. This work may lead to ultra-compact and high-resolution spectrometer systems.

中文翻译:

用于散斑光谱学的带光子灯笼的集成多模波导

我们提出了一种基于与平面光子灯笼 (PL) 集成的多模波导 (MMW) 的高分辨率紧凑型光谱仪。四种模式通过非对称定向耦合器 (ADC) 进入 MMW,并由四个调制器单独切换。MMW 的模场由四个独立的探测器进行空间采样。64 种可能状态的测量(16 种开关状态 $\times $ 4 个模式)允许恢复光信号的频谱。通过实验,我们在 1560 nm 的测量中证明了 0.16 nm 的光谱相关宽度,使用长度为 0.5 mm 的 MMW 进行稀疏和连续光谱检索。为了按比例放大,光谱仪分辨率可以估计为 $\delta ~\lambda = \lambda ^{\mathbf {2}} / \Delta ~{n} _{\mathbf {eff}}~{L}$ 而操作带宽可以估计为 $2^{\mathbf {N}} \times {N} \times \delta \,\,\lambda $ , 和 ${N}$ 表示整个系统支持的模式数量。这项工作可能会导致超紧凑和高分辨率的光谱仪系统。
更新日期:2021-02-01
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