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15 November 2018 Monitoring of fiber grating refractive index modulation
Gaofei Yao, Junbin Huang, Hongcan Gu, Wen Liu
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Proceedings Volume 10964, Tenth International Conference on Information Optics and Photonics; 1096450 (2018) https://doi.org/10.1117/12.2506245
Event: Tenth International Conference on Information Optics and Photonics (CIOP 2018), 2018, Beijing, China
Abstract
In order to design and fabricate high-performance fiber gratings and distributed feedback fiber lasers, the monitoring of AC and DC components of the core refractive index modulation during grating engraving was studied. Based on the Bragg equation and the coupled mode theory, the average variation and fringe visibility of the core refractive index modulation were calculated by monitoring the grating center wavelength and transmission spectrum depth. The grating engraving experiment of boron-germanium co-doped fiber, germanium-doped fiber, and erbium-doped photosensitive fiber was carried out and their refractive index modulation data was obtained. Experiment also showed that the larger pulse energy would make the average variation of core refractive index modulation increases and the fringe visibility decreases.
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Gaofei Yao, Junbin Huang, Hongcan Gu, and Wen Liu "Monitoring of fiber grating refractive index modulation", Proc. SPIE 10964, Tenth International Conference on Information Optics and Photonics, 1096450 (15 November 2018); https://doi.org/10.1117/12.2506245
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KEYWORDS
Refractive index
Modulation
Visibility
Laser engraving
Fiber lasers
Bragg gratings
Reflectivity
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