Journal
OPTICS LETTERS
Volume 48, Issue 17, Pages 4574-4577Publisher
Optica Publishing Group
DOI: 10.1364/OL.497037
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This study proposes a method that balances miniaturization and high performance of fiber optic speckle spectrometers. By using periodically tapered coreless fiber as the scattering element, high-resolution spectral reconstruction is achieved with significant improvement in device miniaturization.
This Letter proposes a method that balances miniaturization and high performance of fiber optic speckle spectrometers. The periodically tapered coreless fiber is used as the scattering element to excite more higher-order modes in the coreless fiber. As a result, a remarkable spectral resolution of 0.03 nm in the near-infrared spectrum can be achieved with a 5-cm-long fiber. Narrow linewidth and broadband spectra in the wavelength of 1540-1560 nm are reconstructed separately, demonstrating the excellent performance of the designed all-fiber spectrometer. The spectral resolution of our proposed spectrometer is comparable to that of a 2-m multimode fiber spectrometer and has a significant improvment in miniaturization.(c) 2023 Optica Publishing Group
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