In order to control of the diameter of microfiber Bragg grating(MFBG) online, a reflection wavelength monitoring method based on chemical etching is proposed in this paper. In the HF acid solution, the optical fiber is regarded as a three-layer uniform cylindrical waveguide structure, and the reflection wavelength corresponds to the outer diameter in a certain environment. By fitting the relationship between the diameter and the reflection wavelength when the diameter is less than 19 μm, the online control of the diameter of MFBG in the range of 9-19 μm can be realized precisely. According to the experimental results, the maximum deviation of the diameter is about 0.31 μm, and the maximum relative deviation is 2.7%. This method provides a new preparation technique for the laboratory research on MFBG
According to the theory of optical waveguide transmission, the polarization correlation of mode distribution in optical microfiber was simulated by numerical calculation, and the polarization correlation of the loss caused by single particle pollutant was less than 0.01 dB. The experimental system was set up. When using ordinary laser (polarization extinction ratio is about 16 dB), the result showed that the optical microfiber would maintain the polarization of the light source, and the polarization correlation of the loss caused by the particle pollution was about 1.5 dB; If using depolarized SLD light source (polarization extinction ratio is about 0.2 dB) instead, the relative loss variation of signal light was less than 0.11 dB, which reduced by about 13 times, and the polarization correlation caused by particles attached to the optical microfiber was basically eliminated. So that using depolarized light source could solve the polarization related problem of optical microfiber particle pollution sensing.
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