An all-fiber spectrometer based on a hollow-core fiber

By writing random microstructures inside and outside the coreless optical fiber, and combining mode interference and scattering effects, the problems of large size and poor stability of traditional spectrometers have been solved, realizing a high-resolution miniature spectrometer suitable for rapid on-site detection.

CN115628812BActive Publication Date: 2026-05-29HARBIN ENG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HARBIN ENG UNIV
Filing Date
2022-10-13
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Traditional benchtop spectrometers are large, heavy, unstable, expensive, and have high requirements for the working environment. Existing miniature spectrometers are insufficient in terms of resolution, response time, and measurement rate, making it difficult to meet the needs of on-site and rapid spectral analysis.

Method used

By employing coreless optical fiber combined with microfabrication technology, random microstructures are inscribed inside and at the fiber ends. By combining mode interference and scattering effects, the randomness of speckle is improved. CCD is used to detect the speckle and perform spectral reconstruction, thereby achieving high-resolution miniaturized spectral measurement.

Benefits of technology

This miniaturized high-performance spectrometer maintains high resolution while shortening fiber length, making it suitable for rapid on-site detection.

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Abstract

The application discloses a kind of all-fiber spectrometer based on coreless optical fiber, including polarization maintaining optical fiber, coreless optical fiber, CCD and computer connected in sequence, and the measured spectrum is sequentially passed through polarization maintaining optical fiber and coreless optical fiber, and the speckle pattern formed is detected by CCD and transmitted to computer, and the measured spectrum is inverted by reconstruction algorithm of computer, and spectrum measurement is realized.The all-fiber spectrometer based on coreless optical fiber using the above structure, by destroying the symmetry of core structure to increase the number of mode excitation, enhance the randomness of speckle distribution, at the same time, using micro-processing technology to write random scattering medium in coreless optical fiber and fiber end as light splitting element, combine mode interference in optical fiber with scattering effect, realize maximum scattering and interference with fixed transmission distance, enhance the randomness of speckle pattern, ensure the miniaturization of spectrometer system while improving spectral resolution, so as to effectively shorten the length of optical fiber, be conducive to taking into account the miniaturization and high performance of all-fiber spectrometer.
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