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Area of Science:

Optics and Photonics
Fiber Optic Sensing
Spectroscopy

Background:

Traditional spectrometers often lack miniaturization or high spectral resolution.
Fiber optic sensors offer potential for compact and robust spectral analysis.

Purpose of the Study:

To develop a miniaturized fiber optic speckle spectrometer with high spectral resolution.
To demonstrate the performance of a novel periodically tapered coreless fiber design.

Main Methods:

Utilizing a periodically tapered coreless fiber as a scattering element.
Exciting higher-order modes within the coreless fiber.
Reconstructing narrow linewidth and broadband spectra in the near-infrared (1540-1560 nm).

Main Results:

Achieved a spectral resolution of 0.03 nm with a 5-cm-long fiber.
Demonstrated excellent performance in reconstructing both narrow linewidth and broadband spectra.
The miniaturized spectrometer's resolution is comparable to a 2-m multimode fiber spectrometer.

Conclusions:

The proposed method effectively balances miniaturization and high performance in fiber optic speckle spectrometers.
The compact, all-fiber spectrometer offers a significant advancement over conventional systems.
This technology enables high-resolution spectral analysis in a highly portable format.