Silicon-based multi-mode interference modulation Fourier transform spectral measurement method and system

A Fourier transform and mode interference technology, which is applied in the field of silicon-based multi-mode interferometric modulation Fourier transform spectroscopy, which can solve the problems of unfavorable system stability, time resolution, and limited application scenarios.

Active Publication Date: 2021-09-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

First, use spectral reconstruction methods such as compressed sensing to break through the sampling law (Rayleigh criterion), but the spectrum to be measured is required to be sparse, and the applicable scenarios are limited. For details, see Podmore H, Scott A, Cheben P, et al. Demonstration of a compressive -sensing Fourier-transform on-chip spectrometer[J].Optics Letters,2017,42(7):1440-1443; Second, observe the Rayleigh criterion, change OPD through active thermo-optic effect physical modulation, and increase OPD sampling points , but it is not conducive to system stability and time resolution. For details, see Montesinos-Ballester M, Liu Q, Vakarin V, et al. On-chip Fourier-transform spectrometer based on spatial heterodyning tuned by thermo-opticeffect[J].Scientific Reports ,2019,9:14633

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  • Silicon-based multi-mode interference modulation Fourier transform spectral measurement method and system
  • Silicon-based multi-mode interference modulation Fourier transform spectral measurement method and system

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Embodiment Construction

[0027] The technical solution of the present invention will be further described in conjunction with the accompanying drawings and embodiments.

[0028] Since the optical path difference OPD is equal to the effective refractive index n eff The product of the arm length difference ΔL, the number of effective OPD sampling points N that can be provided by each MZI OPD,Single Equal to the number N of waveguide modes that each MZI can carry and interfere with mode . According to the Rayleigh criterion, the spectral bandwidth measured by Fourier transform spectroscopy is proportional to the sampling rate of the interference modulation signal. The smaller the sampling OPD interval is, the higher the sampling rate of the interference modulation signal is, the larger the spectral bandwidth is; The resolution is proportional to the maximum sampling OPD of the interferometric modulation signal, the larger the maximum sampling OPD, the higher the spectral resolution. When the size of t...

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Abstract

The invention discloses a silicon-based multi-mode interference modulation Fourier transform spectral measurement method and system. On the basis of maintaining the size of a highly compact silicon-based spectral device, by utilizing the propagation constant difference among various modes of a multi-mode waveguide, interference signals are generated and detected at the same time through various waveguide modes, so the sampling rate of interference modulation signals is greatly improved, the sampling law is followed, the performance of the recovered spectrum is improved, and high-resolution broadband high-performance silicon-based spectrum measurement is achieved.

Description

technical field [0001] The invention belongs to the field of Fourier transform spectrum detection, and in particular relates to a silicon-based multi-mode interference modulation Fourier transform spectrum measurement method and system. Background technique [0002] Spectral detection has become an important method for qualitative and quantitative analysis of material components, including infrared spectroscopy, Raman spectroscopy, and fluorescence spectroscopy. It has been applied in many fields such as material development, food safety, and environmental protection. [0003] Fourier transform spectrometer (Fourier-transform Spectrometer, FTS) has the principle advantages of high spectral resolution and high signal-to-noise ratio, and is recognized as an important device capable of implementing high-performance spectral detection. In order to further improve spectral detection in various Versatility and applicability in complex scenarios, the miniaturization of FTS has att...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/45
CPCG01J3/45
Inventor 王慧捷
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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