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Draw tower grating (DTG) with large capacity, long distance, fast response and other advantages is rapidly becoming the current mainstream fiber optic sensors, but want to write high reflectivity fiber on the draw tower fiber is particularly difficult. Therefore, it is important to further study the grating formation mechanism of fiber gratings for the rapid preparation and wide application of DTG. We will four different types of pure silicon dioxide optical fiber core fiber and G654E bend-resistant fiber for multi-pulse writing experiments. In pure SiO2, due to the lack of oxygen conditions Si-O-Si structure in the middle of the position of the oxygen atom will produce neutral oxygen vacancies, when the capture of a positively charged hole will form a SiE' color centred, while the experimental results of two pure dioxide optical fiber and can not be inscribed out of the grating, indicating that defects in the optical fiber is not a defect in the color centred is not a necessary condition for the formation of optical fiber into the grating. In order to further investigate the role of the color centred on the refractive index modulation of optical fibers, the above fiber for high-pressure hydrogen-carrying experiments, the hydrogen-carrying fiber for the multi-pulse writing experiments, found that there is still a pure dioxide optical fiber can not be written into the grating, and the remaining four types of optical fiber emissivity have a greater increase, to verify that the color centred model of the refractive index modulation of optical fibers is not a direct contribution to the indirect.
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