摘要
Miniaturized spectrometers with high resolving power and cost-effectiveness are desirable but remain an open challenge.In this work,we repurpose a fiber generated by the catastrophic fuse effect and ingeniously harness it for a speckle-based computational spectrometer.Without complex disorder engineering,the axially random micro-cavities in the fused fiber enhance the wavelength sensitivity of multimode interference,enabling a 10 cm fiber to achieve a spectral resolution of 0.1 nm.This performance exhibits sixfold improvement over a common multimode fiber configuration of the same length.Furthermore,we develop a spectral reconstruction method that combines a weighted transmission matrix with automatic differentiation,which reduces the reconstruction error by approximately half and enhances the peak signal-to-noise ratio by 6.12 dB compared to traditional Tikhonov regularization.Spectra spanning a 40 nm range,exhibiting both sparse and dense characteristics,are accurately reconstructed.To the best of our knowledge,this represents the first application of fused fiber in computational spectrometers,demonstrating its potential for a wide range of spectral measurement scenarios.
基金
National Natural Science Foundation of China(62305391)
Scientific Fund of National University of Defense Technology(22-061,BC-03)
Postgraduate Scientific Research Innovation Project of Hunan Province(XJJC2024016)。
